Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1995CAMARO V6-204 3.4L VIN S SFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSPCM CONTROL MODULE DIAGNOSIS
1995 Chevrolet Camaro V6-204 3.4L VIN S SFI
PCM Control Module Diagnosis
1995 Chevrolet Camaro V6-204 3.4L VIN S SFISECTION PCM Control Module Diagnosis
Since the Powertrain Control Module (PCM) can have a fault which may affect only one circuit, following the diagnostic procedures in this section will determine which circuit has a problem and where it is.
If a diagnostic chart indicates the PCM connections or PCM is the cause of a problem, and the PCM is replaced, the knock sensor (KS) module must be transferred to the new PCM and the new PCM must then be programmed. If this does not correct the problem, one of the following may be the reason:
There is a problem with the PCM terminal connections.
The diagnostic chart will say PCM connections or PCM. The terminals may have to be removed from the connector in order to check them properly.
The problem is intermittent.
This means the problem is not present at the time the system is being checked. In this case, refer to Diagnosis by Symptom and make a careful physical inspection of all portions of the system involved.
Shorted solenoid. relay coil. or harness.
Solenoids and relays are turned "ON" and "OFF" by the PCM using internal electronic switches called "drivers." Each driver is part of a group of four called a "Quad-Driver Module" (QDM). A shorted solenoid or relay coil, or computer harness will not damage the PCM but will cause the component to become inoperative.
J 34636 or BT 805 testers provide a fast, accurate means of checking for a shorted coil or a short to battery voltage.
If a diagnostic chart indicates the PCM connections or PCM is the cause of a problem, and the PCM is replaced, the knock sensor (KS) module must be transferred to the new PCM and the new PCM must then be programmed. If this does not correct the problem, one of the following may be the reason:
There is a problem with the PCM terminal connections.
The diagnostic chart will say PCM connections or PCM. The terminals may have to be removed from the connector in order to check them properly.
The problem is intermittent.
This means the problem is not present at the time the system is being checked. In this case, refer to Diagnosis by Symptom and make a careful physical inspection of all portions of the system involved.
Shorted solenoid. relay coil. or harness.
Solenoids and relays are turned "ON" and "OFF" by the PCM using internal electronic switches called "drivers." Each driver is part of a group of four called a "Quad-Driver Module" (QDM). A shorted solenoid or relay coil, or computer harness will not damage the PCM but will cause the component to become inoperative.
J 34636 or BT 805 testers provide a fast, accurate means of checking for a shorted coil or a short to battery voltage.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.