Cadillac Seville / Cadillac Eldorado Forum Discussion, Major malfunctions 99 STS in Past Cadillac Vehicle Discussion; If you have no spark at the plugs, I'd suspect the ICM. Check the 4 connectors (2 on each side ...
Charged the battery got it running but it was so rough too rough to drive it was reviving up and eventually cut itself off the engine also has a loose PCv valve. Which hose was cracked right at the vavle and it wasnt very secure into the engine assembly
Fixed the PCv valve, still couldn't get my car to start just cranking so another AAA tow to the shop that replaced the plugs last week along with the fpr! Hopefully they can tell me some type of idea about what's going on appreciate all the insight, as soon as I hear back I'll post it.
Automobile(s): White Diamond '03 DHS (with DTS floor shift)
Re: Major malfunctions 99 STS
No, it also disables the start enable relay.
When the system is operating in normal mode, the VATS decoder reads the correct resistance during cranking. The module grounds the Start Enable Relay coil. When the start enable relay contacts close, voltage is allowed to the "S" terminal of the starter. The VATS module also sends an enable signal to the ECM. This signal allows the ECM to operate the fuel injectors during cranking. The SECURITY light will also illuminate for approximately five seconds, then turn off and remain off.
If an incorrect or no key resistance is read by the VATS decoder module, the module will shut down the start enable and ECM signal outputs for 4 minutes. The SECURITY light will flash during the cranking attempt, and will remain on during the 4-minute duration. Even if the correct resistance is read within that 4 minute duration, the VATS module will not operate the relay or signal the ECM..An error code.53 will also be set if the proper signal is not being received on CKT 229 by the ECM when the ignition is turned ON.
Well they used r and r spark plugs!! Which I never heard of so I guess they are generic brand plugs, haven't heard back from that shop yet!! I just wanted a diagnostic of the problem, which I'm thinking the plugs need to be replace again.