Diagnostic Test

CHECK FOR POWERTRAIN CONTROL MODULE (PCM) DTCs
NOTE:
Make sure the battery is fully charged before proceeding.
1. With the scan tool, read the PCM DTCs and record on the repair order.
  Are there any battery or charging system DTCs present?
  
  Yes
  - Refer to DTC INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 2
CHECK FOR AN ACTIVE DTC
1. With the scan tool, read the Amplifier DTCs and record on the repair order.
2. With the scan tool, erase Amplifier DTCs.
3. Start the engine.
4. Allow the engine to idle for two minutes.
5. With the scan tool, read Amplifier DTCs.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. If no problems are found, test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (A931) FUSED B(+) CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE
NOTE:
Check the AMPLIFIER fuse for an open. If the fuse is open, make sure to check for a short to ground prior to replacing the fuse.
1. Turn the ignition off.
2. Disconnect the Amplifier C2 harness connector.
3. Turn the ignition on.
4. With a 12-volt test light connected to ground, check the (A931) Fused B(+) circuit at the Amplifier C2 harness connector.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (A931) Fused B(+) circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z911) GROUND CIRCUIT FOR AN OPEN OR EXCESSIVE RESISTANCE
1. With a 12-volt test light connected to 12 volts, check the (Z911) Ground circuit at the Amplifier C2 harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Amplifier in accordance with the Service Information. Refer to AMPLIFIER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the (Z911) Ground circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .