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Blinking check engine light 2004 SRX

33K views 562 replies 11 participants last post by  geocoy2  
#1 ·
geocoy2
Registered
2004 SRX AWD V8
Joined Sep 18, 2021
83 Posts
  • 01-12-2023
My car will not start. When I try to start the car it does nothing. No clicking or anything. Initially it had blinking Check Engine Light. This is an indication there is a serious problem. I had AZ test my battery and it is good, and I have a new starter, so the problem is somewhere in the system. So I borrowed a Code Scanner from AutoZone and I am trying to read failure codes. I used the information from the code scanner, I got a code P0346-00, and it was telling me the Cam Sensors may have a problem. Well, the Cam Sensors had cracked connectors from a previous repair. So I replaced the connectors and the sensors, and the failure code went away. I also replaced the MAP (its and intake Air sensor) because the connector was also damaged and was seriously corroded with oil.
The first three pictures are the initial Failure codes I was working with.
When I try to start the car now, it still does nothing, no clicking, just nothing. The blinking Check Engine light is gone. But the ignition won't allow me to remove the key. So I have to use a tool to remove the key. I ran a scan tool a second time I will post that information in the next Reply below.

Anyone have any ideas?
 

Attachments

#85 ·
sorry that is for a 2008

Well that was my first question, "What Year"?. But I think 08 and 04 are very much the same. You mind telling me where you got that?
.
I see the X2 and X3 have a common ground #73. X1 has no ground.
1) So my question is, are the ECM mounting bolts the ground for the ECM. My mounting bolts were VERY rusted. I had to remove the nuts (The mounting bolts are part of the frame of the ECM) and clean them thoroughly.
2) To test the circuits, I want to put a probe on # 73 and one by one touch each of the other pins to see if they have voltage. My guess is they will either have 12 volts or 5 volts.
3) I tried matching the circuit # on the wiring diagrams to the circuit# on the list of pins and I found a few that match, so that may be a starting point. And the pin #73 is a ground and on the wiring diagram the ground is labeled #73.
 
#86 ·
came from https://alldatadiy.com i really recommend it.

i would connect probe to ground and check all the 12v signals
X1 pin 19 and 20 should have 12v
X2 pins 13 and 28
X3 does not appear to have any 12v signals

check continuity between the ground pins and the battery negative.

with ignition on can check the 5v reference signals.

take care when probing the connectors not to damage any wire insulation or seals, these connectors are sealed to prevent moisture from entering

the cost of a subscription to alldatadiy is well worth the money spent
 
#91 ·
I was kinda curious what the alldata info looks like for a real problem requiring wiring diagrams. I recently bought a CD version of the SRX service manual and it is very low quality and the wiring diagrams aren't readable. I don't even think Cadillac printed paper copies of the SRX service manual so alldata is looking like the only game in town. They must allow for printing pages to bring out to the garage. If that is the case then it would be easy to print to PDF to help somebody else. I probably will search one more time for a paper copy then try alldata since they don't seem to offer a free trial.

edit: GM did print a paper version of the service manual that is 6 volumes and quite expensive. alldata just may make sense for this vehicle.
 
#96 · (Edited)
C2
Image

Pin
Wire Color
Circuit No.
Function
1-2​
--​
--​
Not Used​
3​
D-GN​
485​
TP Sensor 1 Signal​
4​
PU​
486​
TP Sensor 2 Signal​
5-7​
--​
--​
Not Used​
8​
L-GN​
432​
MAP Sensor Signal​
9​
--​
--​
Not Used​
10​
YE​
573​
CKP Sensor 1 Signal​
11​
L-BU​
1876​
Knock Sensor 2 Signal​
12​
GY​
23​
Generator Field Duty Cycle Signal​
13​
GY​
1716​
Low Reference​
14​
L-GN​
5282​
CMP Actuator Solenoid Control Exhaust Bank 1​
15-16​
--​
--​
Not Used​
17​
TN​
1744​
Fuel Injector 1 Control​
18​
OG/BK​
1745​
Fuel Injector 2 Control​
19​
D-BU​
496​
Knock Sensor 1 Signal​
20​
L-BU/BK​
1746​
Fuel Injector 3 Control​
21​
OG/BK​
877​
Fuel Injector 7 Control​
22​
L-GN/BK​
845​
Fuel Injector 5 Control​
23​
YE/BK​
846​
Fuel Injector 6 Control​
24​
D-BU/WH​
878​
Fuel Injector 8 Control​
25​
D-GN​
5273​
CMP Sensor Signal Exhaust Bank 1​
26​
--​
--​
Not Used​
27​
BN/WH​
5303​
Low Reference​
28​
GY​
2303​
Low Reference​
29​
PU​
5284​
CMP Actuator Solenoid Control Intake Bank 1​
30​
YE/BK​
844​
Fuel Injector 4 Control​
31​
OG/BK​
5272​
CMP Actuator Solenoid Control Intake Bank 2​
32​
OG​
5275​
CMP Sensor Signal Intake Bank 1​
33​
D-BU​
5300​
12-Volt Reference​
34​
WH/BK​
5283​
CMP Actuator Solenoid Control Exhaust Bank 2​
35​
TN​
5301​
Low Reference​
36​
OG/BK​
469​
Low Reference​
37​
TN​
2752​
Low Reference​
38​
TN​
2761​
Low Reference​
39​
BN/WH​
2130​
Low Reference​
40​
L-BU​
5302​
12-Volt Reference​
41​
PU​
574​
Low Reference​
42​
BN​
2129​
Low Reference​
43​
PU​
5274​
CMP Sensor Signal Exhaust Bank 2​
44​
TN​
582​
TAC Motor Control - 2​
45​
GY​
5296​
Low Reference​
46​
L-GN​
5298​
12-Volt Reference​
47​
BN​
5299​
Low Reference​
48​
YE​
581​
TAC Motor Control - 1​
49​
YE​
5276​
CMP Sensor Signal Intake Bank 2​
50​
L-GN​
1867​
12-Volt Reference​
51​
GY​
2701​
5-Volt Reference​
52-53​
--​
--​
Not Used​
54​
YE​
410​
ECT Sensor Signal​
55​
D-GN/WH​
428​
EVAP Canister Purge Solenoid Control​
56-57​
--​
--​
Not Used​
58​
PU​
2121​
IC 1 Control​
59​
OG/WH​
2122​
IC 2 Control​
60​
OG​
2127​
IC 7 Control​
61​
L-BU​
2123​
IC 3 Control​
62​
D-GN/WH​
2124​
IC 4 Control​
63​
PU/WH​
2128​
IC 8 Control​
64​
D-GN​
2125​
IC 5 Control​
65​
GY​
2704​
5-Volt Reference​
66-67​
--​
--​
Not Used​
68​
OG​
225​
Generator Turn On Signal​
69​
L-BU/WH​
2126​
IC 6 Control​
70​
--​
--​
Not Used​
71​
YE/BK​
5297​
12-Volt Reference​
72​
--​
--​
Not Used​
73​
BK/WH​
1551​
Ground​

believe this is a 2004 connector 2
 
#98 ·
Image



Pin
Wire Color
Circuit No.
Function
1​
PU​
1666​
HO2S High Signal - Bank 2 Sensor 1​
2​
TN​
1667​
HO2S Low Signal - Bank 2 Sensor 1​
3​
PU/WH​
5281​
HO2S Output Pump Current Bank 1 Sensor 1​
4-11​
--​
--​
Not Used​
12​
D-BU​
1936​
Fuel Level Sensor Signal - Secondary​
13​
YE​
5036​
HO2S Heater Low Control - Bank 1 Sensor 2​
14​
OG/BK​
463​
Requested Torque Signal​
15​
--​
--​
Not Used​
16​
PU​
5035​
HO2S Heater Low Control - Bank 2 Sensor 2​
17​
TN/BK​
464​
Delivered Torque Signal​
18​
OG/BK​
1786​
Ignition Lock Cylinder Control Actuator Signal​
19​
TN​
1671​
HO2S Low Signal - Bank 1 Sensor 2​
20​
PU/WH​
1668​
HO2S High Signal - Bank 2 Sensor 2​
21​
TN/WH​
1669​
HO2S Low Signal - Bank 2 Sensor 2​
22​
OG​
5280​
HO2S Input Pump Current Bank 1 Sensor 1​
23​
BN​
1174​
Oil Level Switch Signal​
24​
L-BU​
1937​
Fuel Gage Sensor - Signal - Right​
25​
TN/WH​
331​
Oil Pressure Sensor Signal​
26-36​
--​
--​
Not Used​
37​
TN​
452​
Low Reference​
38​
BK​
2755​
Low Reference​
39​
--​
--​
Not Used​
40​
PU/WH​
5037​
HO2S Heater Low Control - Bank 1 Sensor 1​
41​
L-BU​
5038​
HO2S Heater Low Control - Bank 2 Sensor 1​
42​
GY​
2709​
5-Volt Reference​
43​
PU​
1670​
HO2S High Signal - Bank 2 Sensor 2​
44​
D-GN​
890​
Fuel Tank Pressure Sensor Signal​
45​
PU/WH​
1665​
HO2S High Signal - Bank 1 Sensor 1​
46​
TN/WH​
1653​
HO2S Low Signal - Bank 1 Sensor 1​
47​
--​
--​
Not Used​
48​
WH​
5279​
HO2S Output Pump Current Bank 2 Sensor 1​
49​
L-GN​
5278​
HO2S Input Pump Current Bank 2 Sensor 1​
50​
--​
--​
Not Used​
51​
GY​
2705​
5-Volt Reference​
52-56​
--​
--​
Not Used​
 
#99 · (Edited)
C1
Image


Pin​
Wire Color​
Circuit No.​
Function​
1​
TN/BK​
2500​
High Speed GMLAN Serial Data Bus+​
2​
TN​
2501​
High Speed GMLAN Serial Data Bus-​
3-4​
--​
--​
Not Used​
5​
TN​
1274​
5-Volt Reference​
6​
--​
--​
Not Used
7​
WH/BK​
1164​
5-Volt Reference​
8-9​
--​
--​
Not Used
10​
WH​
1310​
EVAP Canister Vent Solenoid Control​
11​
OG/BK​
380​
A/C Refrigerant Pressure Sensor Signal​
12​
--​
--​
Not Used
13​
OG​
5371​
Stop Lamp Switch Signal​
14​
YE​
447​
Starter Relay Coil Control​
15​
PU​
1807​
Class 2 Serial Data (Primary)​
16​
PU​
1807​
Class 2 Serial Data (Primary)​
17​
PK/BK​
5290​
Ignition 1 Voltage​
18​
PK​
239​
Ignition 1 Voltage​
19​
PK​
239​
Ignition 1 Voltage​
20​
RD/WH​
1440​
Battery Positive Voltage​
21​
L-BU​
1162​
APP Sensor 2 Signal​
22​
--​
--​
Not Used​
23​
D-GN/WH​
465​
Fuel Pump Relay Control - Primary
24​
BN/WH​
419​
MIL Control
25​
D-GN/WH​
459​
A/C Compressor Clutch Relay Control
26​
WH​
121​
Engine Speed Signal
27​
D-BU​
1161​
APP Sensor 1 Signal
28​
BN​
818​
Vehicle Speed Signal
29​
YE​
492​
MAF Sensor Signal
30​
PK/WH​
1101​
Damping Lift/Dive Signal (F55)
31​
TN​
2760​
Low Reference
32​
TN​
470​
Low Reference
33​
OG/WH​
812​
12-Volt Reference or I/P Dimming Voltage Reference
34​
--​
--​
Not Used
35​
GY​
2700​
5-Volt Reference
36​
BN​
1271​
Low Reference
37​
PU​
1272​
Low Reference
38-41​
--​
--​
Not Used
42​
D-BU​
473​
High Speed Cooling Fan Relay Control
43​
BN​
5069​
Main Relay Control
44​
--​
--​
Not Used
45​
GY​
847​
Extended Travel Brake Switch Signal
46​
YE​
343​
Accessory Voltage
47-48​
--​
--​
Not Used
49​
YE/BK​
5270​
Traction Control Data Signal
50​
--​
--​
Not Used
51​
TN​
472​
IAT Sensor Signal
52​
--​
--​
Not Used
53​
GY​
1884​
Cruise Control Set/Coast and Resume/Accelerate Switch Signal
54​
YE​
5​
Crank Voltage
55​
D-GN​
335​
Low Speed Cooling Fan Relay Control
56​
--​
--​
Not Used
 
#102 ·
Im having a problem getting good reading with my Innova 3320. It's developed a problem when you turn it on of continuous flickering numbers. When I put it on the battery to check voltage it works just fine, the flickering stops, and I get a 12-volt reading. When I'm checking the pins for current, I'm not getting a good reading, it's just flickering. I've contacted Innova to find out if this is repairable or do I have to get a new one. I'm assuming I should get 12 volts reading on the plug side of the connector. I'm not checking the ECM side of the connection. I am charging the battery while I'm checking.
 
#105 ·
check all the pins that show 12v or 5v in the list
the rest of the pins are not important for this
you need to determine if the ecm is getting its proper voltage at those points
if you look at the list the pins that correspond to other things like the oxygen senors, they will be active while the engine is running.

proper voltage and grounds to the ecm

the more things you play with during testing the more chances of other things failing or causing other issues
if you have cleaned the grounds that you could access you need to determine if the systems are getting correct voltage
also check the ground pins to make sure they are all good
 
#107 · (Edited)
C1
These pins should show 12v
17PK/BK5290Ignition 1 Voltage
18PK239Ignition 1 Voltage
19PK239Ignition 1 Voltage
20RD/WH1440Battery Positive Voltage
These pins all read 12.23 volts, same as the battery terminals. Battery is on a charger.

New Edit
C1 = All the 5 volters have no reading
The #73 Ground reads 1.07

C3 =
#18 = 1.07
#42 and 51 No reading

So NOw: What conclusions can we draw from all of this testing. What should I check next.
 
#109 · (Edited)
12.2 volts while on the charger? sounds marginal

I know its not a full charge, I just put it on a charger about an hour earlier. Just just leave it on there while I'm working. The key is on the "ON" position while I'm testing so its a slow drain vs a slow charge.
New Edit
I left the charger on all day. it is now up to 13.2 Volts and it is holding the charge. This battery is only about a week old.
 
#111 ·
check this thread to see if anything is helpful
 
#112 · (Edited)
check this thread to see if anything is helpful
The first part is familiar but I have never had a water problem. I have a brand new battery, new starter Let me check the rust on the EBCM.
New Edit:
I found the EBCM but I am not enthusiastic about what I can see. Someone has been here before me, there should be a red band on the fitting, and it is gone. I was really surprised how easy the fixture came off.
Image



Image


Image


Image


I'm ready to clean up this dust and put this thing back together.
After thinking about that mounting bolt on the EBCM, I don't think I want to touch that bolt. It has the look of and an adjustment for a belt or something. If I loosen it, I may get it out of adjustment.
 
#113 ·
lets just say it's a 2004........ with rust........ water may enter through spots you never notice.
electrical gremlins can be a pain
have you rechecked the wiring for the ignition switch that you replaced?
what are the things you've done after the no start?
what was the last thing that you worked on before the no start situation?
 
#115 · (Edited)
lets just say it's a 2004........ with rust........ water may enter through spots you never notice.
1) I have not re-checked the wiring for the ignition switch. As I recall, I replaced the ignition switch, and it was just a snap in-place switch. It had a receptacle that plugged into it, but all wiring looked like new.
Image

2) The car was still running (July of last year) but I Developed a parasitic drain, that was draining the battery. Investigation and help from the Forum, I discovered it was the disc player. It had several discs in it and it could not park them in place when you turned the car off. So it was draining the battery. I finally just removed the discs and it stopped the fusing. I had to remove the navigation disc as well. It was the only way I could retain the information system. I drove the car for a few months like this.
Then it developed a clicking noise when I tried to start the car. At first it was just one click and then it would start. Finally, it just refused to click or start.
.
I think it was about this time I called the manufacturer of the starter motor. He told me there are only a few reasons why the starter would not work. Either there is a poor ground or a poor positive lead from the battery. So, I ran new leads from the battery directly to the starter motor. I had a dedicated positive #2 wire run to the starter. And a dedicated #2 ground wire to the starter motor. It grounds at the engine a few inches from the starter. I got it running again and I drove it for a while. Then it started the clicking noise again.
It was off and on, but it made it feel very unreliable.
Then one day I backed it into the garage, and it just refused to start.

3) Well when it would not start, that's when I started having trouble with the key not coming out of the ignition. So my first instinct was to replace the ignition switch.

Thats when I created this post:
My car will not start. When I try to start the car, it does nothing. No clicking or anything. Initially it had blinking Check Engine Light. This is an indication there is a serious problem.
I got a code scanner, and it was reading codes from past repairs, so I cleared the codes and scanned it again and that's when we got the communication errors.

Originally the lights on the dash were blinking all over the place. Then when you open the door the parking lights would come on and the taillights would come on.
You guys (Forum) suggested it was rusted or poor connections, so I started looking all over the car for bad connections. I also replaced the Cam sensors and the map sensor because the fixtures were damaged. I also checked my wiring, to make sure my sensor wiring was correct. Turns out I had improperly changed the wiring to the map sensor. So I made that repair again.

Now that I made these changes the dash lights still come on, but they seem to be normal. Right now, the only warning light that comes on is the traction control light. The Check engine light is off. When I put the key in the ignition and turn it to run, I get normal warnings that the lift gate is open, check the tire pressure gauge, Service suspension system. Service Suspension is relatively new, not sure what triggered that. When I turn the key to the off position, I have to use a tool to remove it. When I get out and close the door the interior lights stay on for a few minutes because the lift gate is open. But it finally goe out on its own. So it has improved.
Keep in mind too that right now I have the ECM unplugged and I have the EBCM unplugged also
NEW EDIT
Almost missed the grounding point on the ABS. I didnt want to touch this nut thinking it was an adjustment nut. Now I know this has to be a grounding point.

Image


NEW EDIT
You cannot get a wrench on that nut it set in a slot that is not wide enough for the wrench. Tried putting vicegrips on it but even that slips off. So I'm in a slow process of cutting it off ARG.
/QUOTE]
 
#120 · (Edited)
you really need a service manual

Let me finish up with the EBCM. I'm trying to clean up the ground.

NEW EDIT
Still trying to find the right tool to get the ground off th EBCM.. But its my understanding that something has to go wrong in the system, Like a bad ground or a bad connection. When that problem is noticed the communications get mixed up and THAT triggers a fail code U1301. So we could search either way to find that ground or bad connection. Let me finish the grounds and if we haven't fixed it by then... Well it's decision time. I'm coming up on the one year mark of making repairs on this car. You can't imagine the frustration. But I have a lot of time invested in this I dont like to give up.
 
#122 ·
a bad module can also cause U1301 i believe
.
Well I believe I discovered what is going on. I tried to remove that bolt on the EBCM and it just refuses to budge. It is corroded right to the frame of the fixture it is mounted on. So I tried heating it gently and I used penetrating oil on it, I even tried tapping on it and I took a chisel to it. It is really stuck on its frame. So I sprayed penetrating oil on it and I went back to the ECM to see if I could take it off and clean it up better. Its mounted on a not very rigid frame that has four bolts pertruding thru the ECM. I managed to get the nuts off before but I wanted to see if I could remove the module and clean it up better. So the nuts come right off but the module will not budge off the frame. The bolts are rusted tight to the module itself. I managed to get one bolt loose so I could verify it should come right off, but the other three bolts are rusted tight. Im thinking if there is that much rust that is probably the reason they are not making good contact.
.
My strategy is to spray penetrating oil on the bolts and run the nuts on and off until I can break it loose, but right now I am not seeing any progress so far. If I accidentally break the module, the car is a tow away.
.
Image
 
#123 ·
IMHO,
You're chasing yourself into the ground

The ECM gets ground from the ground splice pack and has several clean grounds going into it

You MUST stick in your debugging to what the DTC is, which you state is a U1301
Do nothing else but look at that

Check the class 2 serial data line for a short to voltage.
With your voltmeter set to min/max. KO / EO
What is the max voltage you get from pin 2 at the DLC connector.
Red lead to pin 2, black lead to ground.
That DTC says there is a high when it should not be

I explained in past posts you have to stick with the vehicles network,
If pin 2 is high, you might start by pulling one at a time a controller out of the network
Check pin 2 and also see if U1301 comes back or not
If the problem does not go away, then plug it back in and pull the next controller and repeat until
Pin 2 goes low.

Something is shorted to the network line and that would kill that controller from functions on
that Starbus but also screws up other controllers

I do not know where the Starbus network is for your vehicle, most cases it is next to the BCM as it is the commander/router of the network
Should be like several wires laying flat and has flat connectors for controllers to connect to
 
#124 · (Edited)
IMHO,

The ECM gets ground from the ground splice pack and has several clean grounds going into it
  • 1) So your saying the ECM is using the post #73 in Plug C2 as its ground.
  • 2) If that is true I can put the ECM back together
You MUST stick in your debugging to what the DTC is, which you state is a U1301
  • Its my understanding that an error has to occur somewhere in the system to generate a U1301
  • In this case a faulty groung could eventually create a U1301
  • I understand your thought process that I should track down the cause/ or what generated the U1301
  • Or in your words "Check the class 2 serial data line for a short to voltage."
  • With your voltmeter set to min/max. KO / EO
  • This is the Voltmeter I have there is no Min/Max KO/EO, so Im stuck
Image


.
  • What is the max voltage you get from pin 2 at the DLC connector.
    I have not opened the DLC plug

  • Red lead to pin 2, black lead to ground.
  • That DTC says there is a high when it should not be
  • If pin 2 is high, you might start by pulling one at a time a controller out of the network
  • I have no idea what a controller is.
    But I understand your examination.
  • Something is shorted to the network line and that would kill that controller from functions on
    that Starbus but also screws up other controllers
  • Agreed,
  • I do not know where the Starbus network is for your vehicle, most cases it is next to the BCM as it is the commander/router of the network
    Should be like several wires laying flat and has flat connectors for controllers to connect to
  • I am working on the ground at the EBCM. the bolt is badly rusted and I need to get it loose and clean it up
  • This bolt is listed as a Ground for the ECBM
  • Image
One last point I wanted to make. I have the whole front end torn off the car so I can see most everything. I have found and cleaned all of the grounds in the Engine Bay except for the #8 on the pic below. It is the ABS ground. Thats what I have been working on the last few weeks. I just want to get it cleaned up so I can cross grounds in the engine bay off my list. It is my thinking that the root cause of this problem came from my recent work when I changed out the Catalytic converter. I was not having any issues before that. All of that work was in the Engine Bay.

Image
 
#128 · (Edited)
Yes, pull one module at a time and test pin 2 for less 7 volts
Class 2 functions from ground
.
  • Well, I put the ECM back together and I apparently shook something up. I decided to hook up the Code reader to see if anything changed.
    First thing I notice was the key comes out of the ignition without using a tool. Not sure what I can conclude from that since the ignition switch was operational before that, it just would not allow me to remove the key.
  • So I hooked up the code reader and I have a bunch of new codes we were not seeing before.
  • P2138Accelerator pedal Position Sensors 1-2 Not plausibleGeneric Stored
    P06415 V Reference 1 CircuitGeneric Stored
    P2108Throtle Actuator Position PerformanceGeneric Stored
    U0100Lost Communication with ECMGeneric Stored
    P06415V Reference 1CircuitGeneric Pending
    P2067Fuel Level Sensor 2 Circuit Low VoltageCurrent
    U1040Lost Communication with EBCMFSC DTC
    U0100-00Lost Communication with ECMCadillac MIL
    MIL = Malfunction Indicater LampCheck Engine Light
 
#135 ·
Yes, if the KO EO when you were testing and voltage is going up down but not going to 7 volts than
a short to ground you assume

You need to find the Starbus network and the test splice pack to take modules out of the network and then test each one of that pack to find who is causing this as you know if valid talking on buss the volts would be going to about the 7 volts

Not sure if this would work but instead of pulling the cap of test splice pack is
what if the fuses for modules one at a time, would the low voltage on pin one go away ?

Maybe not as if it's a wire shorted to ground, it still is even if the module's fuse is pulled ?
Might be a quick test to find that out but if you have easy access to the Starbus test pack
I would test there
 
#136 · (Edited)
Yes, if the KO EO when you were testing and voltage is going up down but not going to 7 volts than a short to ground you assume
NEW EDIT
You need to find the Starbus network and the test splice pack to take modules out of the network and then test each one of that pack to find who is causing this as you know if valid talking on buss the volts would be going to about the 7 volts

Might be a quick test to find that out but if you have easy access to the Starbus test pack
I would test there
  • I don't know what a Starbus is, or what it looks like
  • I assume a Starbus is a wire harness
NEW EDIT
So I Performed the test we talked about, Pulling the Controllers/ Splice Pack out of the modules and see if one of them causes a change in the low readings
.
  • Just to be clear the original reading I got when I tested the DCL at pin #2 was .8 to 1.9 fluctuating, so we decide it was likely a wire to ground but at what module.
  • The ECBM controller made no change when I pulled the Splice Pack Connector
  • I pulled the Connectors for the Cam Sensor and Mass Air Flow connector, only because I had re-wired both of them. Just wanted to be sure they were not part of the problem.
  • I pulled C1 Top connector on the ECM and it had no effect
  • I pulled C2 the middle connector on the ECM and the reading changed drastically. The new Reading jumped to eight (8.54)
  • I pulled C3 the bottom connector and it had no effect on the reading
  • I pulled the connector for the transmission Control module and it had no effect on the reading.
  • So I assume we can conclude there is likely a short to ground in some of the wiring to the C#2 connector. How do we determine what wiring is leading into the C#2 Connector?

PinWire ColorCircuit No.Function
1-2----Not Used
3D-GN485TP Sensor 1 Signal
4PU486TP Sensor 2 Signal
5-7----Not Used
8L-GN432MAP Sensor Signal (I worked on this)
9----Not Used
10YE573CKP Sensor 1 Signal
11L-BU1876Knock Sensor 2 Signal
12GY23Generator Field Duty Cycle Signal
13GY1716Low Reference
14L-GN5282CMP Actuator Solenoid Control Exhaust Bank 1
15-16----Not Used
17TN1744Fuel Injector 1 Control ( I worked on the Fuel Injector Fittings)
18OG/BK1745Fuel Injector 2 Control
19D-BU496Knock Sensor 1 Signal
20L-BU/BK1746Fuel Injector 3 Control
21OG/BK877Fuel Injector 7 Control
22L-GN/BK845Fuel Injector 5 Control
23YE/BK846Fuel Injector 6 Control
24D-BU/WH878Fuel Injector 8 Control
25D-GN5273CMP Sensor Signal Exhaust Bank 1
26----Not Used
27BN/WH5303Low Reference
28GY2303Low Reference
29PU5284CMP Actuator Solenoid Control Intake Bank 1
30YE/BK844Fuel Injector 4 Control (??) not sure about this
31OG/BK5272CMP Actuator Solenoid Control Intake Bank 2
32OG5275CMP Sensor Signal Intake Bank 1
33D-BU530012-Volt Reference
34WH/BK5283CMP Actuator Solenoid Control Exhaust Bank 2
35TN5301Low Reference
36OG/BK469Low Reference
37TN2752Low Reference
38TN2761Low Reference
39BN/WH2130Low Reference
40L-BU530212-Volt Reference
41PU574Low Reference
42BN2129Low Reference
43PU5274CMP Sensor Signal Exhaust Bank 2
44TN582TAC Motor Control - 2
45GY5296Low Reference
46L-GN529812-Volt Reference
47BN5299Low Reference
48YE581TAC Motor Control - 1
49YE5276CMP Sensor Signal Intake Bank 2
50L-GN186712-Volt Reference
51GY27015-Volt Reference
52-53----Not Used
54YE410ECT Sensor Signal
55D-GN/WH428EVAP Canister Purge Solenoid Control
56-57----Not Used
58PU2121IC 1 Control
59OG/WH2122IC 2 Control
60OG2127IC 7 Control
61L-BU2123IC 3 Control
62D-GN/WH2124IC 4 Control
63PU/WH2128IC 8 Control
64D-GN2125IC 5 Control
65GY27045-Volt Reference
66-67----Not Used
68OG225Generator Turn On Signal
69L-BU/WH2126IC 6 Control
70----Not Used
71YE/BK529712-Volt Reference
72----Not Used
73BK/WH1551Ground

believe this is a 2004 connector 2