No Response From PCM (Powertrain Control Module)
*NO RESPONSE FROM POWERTRAIN CONTROL MODULE (PCM)
For a complete wiring diagram Consult Diagrams/Electrical.
Diagnostic Test
1. TEST FOR INTERMITTENT CONDITION
NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
NOTE: If the BCM is not functioning there will be no response from any CAN B or CAN C modules. Perform the No Response from BCM diagnostic procedure before continuing with individual module diagnostics.
NOTE: Check for any active CAN C hardware DTCs, perform DTC before proceeding. No Response From BCM (Body Control Module)
Turn the ignition on.
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
With the scan tool, select ECU View.
NOTE: If the BCM is not configured properly individual modules may not show up on the scan tool diagnostic screens. If an individual module known to be on the vehicle does not show up on the scan tool, check BCM configuration before continuing with the diagnostic procedures.
NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
Does the scan tool display a red X next to the module?
Yes
- Go To 2
No
- The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
2. (Z130) (Z131) GROUND CIRCUITS OPEN
Turn the ignition off.
Disconnect the PCM C1 harness connector.
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.
Using a 12-volt test light connected to 12-volts, check each (Z130) and (Z131) ground circuit.
Does the test light illuminate brightly for each circuit?
Yes
- Go To 3
No
- Repair the ground circuit for an open.
- Perform the (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test
3. (F343) ASD RELAY OUTPUT CIRCUIT OPEN OR SHORTED
Turn the ignition on.
Using a 12-volt test light connected to ground, check the (F343) ASD Relay Output circuit.
Does the test light illuminate brightly?
Yes
- Go To 4
No
- Repair the (F343) ASD Relay Output circuit for an open or short.
- Perform the (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test
4. (F202) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED
Using a 12-volt test light connected to ground, check the (F202) Fused Ignition Switch Output circuit.
Does the test light illuminate brightly?
Yes
- Go To 5
No
- Repair the (F202) Fused Ignition Switch Output circuit for an open or short.
- Perform the (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test
5. (D65) CAN C BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the BCM C3 harness connector.
Measure the resistance of the (D65) CAN C Bus (+) circuit between the BCM C3 harness connector and the appropriate terminal of the special tool #8815.
Is the resistance below 5.0 ohms?
Yes
- Go To 6
No
- Repair the (D65) CAN C Bus (+) circuit for an open.
- Perform the (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test
6. (D64) CAN C BUS (-) CIRCUIT OPEN
Measure the resistance of the (D64) CAN C Bus (-) circuit between the BCM C3 harness connector and the appropriate terminal of the special tool #8815.
Is the resistance below 5.0 ohms?
Yes
- Replace and program the Powertrain Control Module.
- Perform the (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test
No
- Repair the (D64) CAN C Bus (-) circuit for an open.
- Perform the (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test