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Tried to check codes, got strange result


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I tried to check my codes today in my 91 SS. I connected the green connectors under the dash on the left side then switched the key to run. All the warning lights came on and the cooling fan cycled on and off repeatedly. No flashing CEL and no flashing LED on ECM. (if there is one)

 

Is there something I'm missing???

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Connect the black connectors close by the green one.

 

Green puts the car in the D-Check mode, cycles through all the relays and sensors.

 

Black will pull the codes

 

Green and black at the same time will clear the codes

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so I got:

 

13- TDC sensor

22- ?

24- Air control valve or circuit

32- O2 sensor

35- PURGE SOLENOID!!!

42- Idle switch

44-?

[...]

I assume "Boosted" refers to a turbo :) , so I think the correct code definitions are as follows:

13 - Cam Position Sensor

22 - Knock Sensor or Circuit

24 - Air Control Valve or Circuit

32 - Oxygen Sensor or Circuit

35 - EGR Solenoid or Circuit

42 - Idle Switch or Circuit

44 - Wastegate Duty Solenoid (Turbo Models)

 

With that many simultaneous DTCs, I'd suspect something common to all of them. There might be an ECU-related problem, possibly something as simple as a poor ground connection.

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Yeah, the O2, wastegate solenoid and knock sensor codes were likely from me messing with them. But I haven't touched the purge solenoid. The car does seem to run a bit rich; I can smell heavy exhaust, no smoke though. I'll clear all the codes and then try disconnecting the purge solenoid and see how it runs. Then maybe I'll try sucking some seafoam through the solenoid.

 

After that, I'll try running a fresh ground to the ECU.

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