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.
2002 Chrysler Intrepid BaseFACTORY OEM SERVICE PROCEDURE
No Response From PCM (SCI Only)
NOTE:
After making any repairs, perform POWERTRAIN SYSTEM VERIFICATION TEST
under VERIFICATION TESTS.
Possible Causes:
- Check PCM Powers And Grounds
- PCM SCI Transmit Circuit Shorted To Voltage
- PCM SCI Receive Circuit Shorted To Voltage
- PCM SCI Circuits Shorted Together
- PCM SCI Transmit Circuit Shorted To Ground
- PCM SCI Receive Circuit Shorted To Ground
- PCM SCI Transmit Circuit Open
- Powertrain Control Module
Testing
- Perform CHECKING POWERTRAIN CONTROL MODULE (PCM) POWER & GROUND CIRCUITS test under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article in ENGINE PERFORMANCE. Repair power and/or circuit(s) as necessary. If power and ground circuits are okay, go to next step.
- Turn ignition off. Disconnect PCM Gray connector C2. Disconnect scan tool from DLC. Measure resistance between ground and PCM Gray connector C2 terminal No. 65, SCI transmit circuit (Pink/Tan wire). See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, leave PCM Gray connector C2 disconnected and go to step 4 .
- Ensure ignition is off. Disconnect Powertrain Control Module C1 connector. Measure resistance between ground and TCM connector terminal No. 7, SCI transmit circuit terminal No. 36 (Pink/Tan wire). See Figure . If resistance is less than 100 ohms, repair short to ground in Pink/Tan wire. If resistance is 100 ohms or more, replace TCM. See TRANSMISSION CONTROL MODULE under REMOVAL & INSTALLATION.
- Measure resistance between ground and PCM Gray connector C2 terminal No. 75, SCI receive circuit (Light Green wire). If resistance is less than 100 ohms, repair short to ground in Light Green wire. If resistance is 100 ohms or more, leave PCM Gray connector C2 disconnected and go to next step.
- Measure resistance of SCI receive circuit (Light Green wire) between DLC terminal No. 6 and PCM Gray connector C2 terminal No. 75. See Figure and Figure . If resistance is less than 5 ohms, leave PCM Gray connector C2 disconnected and go to next step. If resistance is 5 ohms or more, repair open in Light Green wire.
- Measure resistance of SCI transmit circuit (Pink/Tan wire) between DLC terminal No. 7 and PCM Black connector C1 terminal No. 36. See Figure . If resistance is less than 5 ohms, replace PCM. See POWERTRAIN CONTROL MODULE under REMOVAL & INSTALLATION. If resistance is 5 ohms or more, repair open in Pink/Tan wire.
NOTE:
Ensure scan tool is disconnected from Data Link Connector (DLC) for remainder of test procedure.
Factory Service Tools
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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.