p1375 icm 24x reference voltage too high and p1350 ignition control system
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Northstar Engines and System Technical Discussion Discussion, p1375 icm 24x reference voltage too high and p1350 ignition control system in Cadillac Engine Technical Discussion; Any ideas on how to fix? P1375 icm 24x reference voltage too high and P1350 ignition control system- from 98 ...
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    nicbrown is offline Cadillac Owners Member
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    p1375 icm 24x reference voltage too high and p1350 ignition control system

    Any ideas on how to fix? P1375 icm 24x reference voltage too high and P1350 ignition control system- from 98 STS

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    AJxtcman's Avatar
    AJxtcman is offline Cadillac Owners Connoisseur
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    Re: p1375 icm 24x reference voltage too high and p1350 ignition control system

    ICM.
    Ignition Control Module

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    nicbrown is offline Cadillac Owners Member
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    Re: p1375 icm 24x reference voltage too high and p1350 ignition control system

    I need to replace it don't I. Can I find it anywhere that is less expensive than a dealership?

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    Re: p1375 icm 24x reference voltage too high and p1350 ignition control system

    DTC P1375 IC 24X Reference Circuit High Voltage
    Refer to Cell 20: Ignition Control (IC) Module in Engine Controls Schematics.

    Circuit Description
    This diagnostic test checks for 24X signal at a logic high condition. The fault could be induced by the failure of either Crankshaft Position A or B Sensor input signal to the Ignition Control Module. Under such a condition, the Ignition Control Module would force the 24X signal high. This DTC will also set if the 24X signal is shorted to voltage externally. If either condition is met DTC P1375 is set.

    Conditions for Running the DTC
    DTC P1376 is not set.
    Engine speed greater than 496 RPM.
    At least 7 CAM pulses received since key ON.
    Conditions for Setting the DTC
    24X signal voltage is high and no 24X reference pulses have been received during the last 8 4X reference pulses.

    Action Taken When the DTC Sets

    The PCM will illuminate the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
    The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records.
    Conditions for Clearing the MIL/DTC

    The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
    A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.
    A History DTC will clear after forty consecutive warm-up cycles with no failures of any emission related diagnostic test.
    Use a scan tool to clear DTCs.
    Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation.
    Test Description
    Number(s) below refer to the step number(s) on the Diagnostic Table.

    Checking for a faulty crank A sensor or circuit failure.

    Checking for a faulty crank B sensor or circuit failure.

    To ensure acuurate voltage readings, connect the DMM J 39200 to the sensor before recording the Peak Min Max voltage.

    To ensure acuurate voltage readings, connect the DMM J 39200 to the sensor before recording the Peak Min Max voltage.

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    nicbrown is offline Cadillac Owners Member
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    Re: p1375 icm 24x reference voltage too high and p1350 ignition control system

    One of those two sensors is on the top of the engine correct the other is behind the oil filter in an akward position. What are the man hours to replace them through the dealer or mechanic and can I get to the one on top easy?

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    Re: p1375 icm 24x reference voltage too high and p1350 ignition control system

    Quote Originally Posted by nicbrown View Post
    One of those two sensors is on the top of the engine correct the other is behind the oil filter in an akward position. What are the man hours to replace them through the dealer or mechanic and can I get to the one on top easy?
    I need your E mail

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    nicbrown is offline Cadillac Owners Member
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    Re: p1375 icm 24x reference voltage too high and p1350 ignition control system


  9. #8
    1starrider is offline Cadillac Owners Member
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    Re: p1375 icm 24x reference voltage too high and p1350 ignition control system

    Quote Originally Posted by nicbrown View Post
    One of those two sensors is on the top of the engine correct the other is behind the oil filter in an akward position. What are the man hours to replace them through the dealer or mechanic and can I get to the one on top easy?
    im getting the same codes were are the sensors at ? just got car running again after doing a headgasket job and this is all needed to complete this pain in the a-- job

    thanks alot

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: p1375 icm 24x reference voltage too high and p1350 ignition control system

    Crankshaft Position Sensor (CKP) A is the lower, B is the upper. Both are next to each other, vertically, just to the right of the oil filter adapter. Up on the front side of the engine. The knock sensor is up in the engine intake valley

    To do the job properly with few tools and little experience, the car should be up on a lift. Remove the lower splash shield and look up and in with a good drop light. If you're clever and have the tools, you can change the 2 CKP's without removing the oil filter, hoses, and adapter, but that process gives you more room. Each CKP (they're different) has a unique electrical connector so the wires can't be mixed up, but the sensor must be placed in the proper opening. You may have to go to the dealer later in order to have the CKP Relearn procedure done if there's a low speed driveability problem.

    Go into www.rockauto.com and drill down to your car and year, engine and/or emissions/ modules in the drop down menu and find "Crankshaft Position Sensor". Also get 12-14 of the plastic pop rivets for the splash shield from a GM dealer. $.50 or so each. If your car has an oil cooler (2 pipes coming out the front of the oil filter adapter) you also need new quick connect fittings which screw into the adapter.

    Total DIY: $110. Total dealer: about $475.

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