Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read DTCs and Freeze Frame Data and record on the repair order.
2. With the scan tool, erase DTCs.
3. Using the recorded Freeze Frame Data and the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
4. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE VOLTAGE SUPPLY TO STARTER RELAY 1
1. Turn the ignition off.
2. Remove Starter Relay 1 from the Auxiliary PDC.
3. Using a 12 volt test light connected to ground, probe the Fused B+ circuit at Starter Relay 1 connector (pin 30) in the PDC.
4. Attempt to crank the engine with the ignition key.
  NOTE:
  The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the Battery.
  
  Is the test light illuminated and bright?
  
  Yes
  - Go To 7
  No
  - Go To 3
CHECK THE VOLTAGE SUPPLY TO STARTER RELAY 1 FROM BCM
1. Turn the ignition on.
2. Using a 12 volt test light connected to ground, probe the (F30) Fused B+ circuit at the BCM.
  NOTE:
  The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the Battery.
  
  Is the test light illuminated and bright?
  
  Yes
  - Go To 4
  No
  - Go To 6
ISOLATE AND CHECK THE (F30) FUSED B+ CIRCUIT FOR A SHORT TO GROUND
1. The ignition must be off when checking a circuit for continuity to ground.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and every component harness connector containing the circuit being tested. Note: Use the wiring diagram as a guide to follow the path of the circuit.
3. Connect the negative lead of the DVOM to a known good ground.
4. With the positive lead of the DVOM, probe the circuit being tested at the component harness connector and check for continuity between the circuit and ground.
NOTE:
There should be no continuity between ground and the circuit being tested.

Is there continuity between ground and the circuit being tested?

Yes
- Repair the circuit for a short to ground. Use the wiring diagram as a guide to trace the circuit and look for any in-line connectors to help isolate the location of the short.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Go To 5
CHECK THE (F30) FUSED B+ CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (F30) Fused B+ circuit between the BCM C3 harness connector and the Starter Relay 1 connector (pin 30) in the PDC.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (F30) Fused B+ circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK RELATED BCM AND COMPONENT CONNECTIONS
1. Disconnect all BCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
10. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (T750) STARTER RELAY OUTPUT CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the PCM C1 harness connector.
3. Disconnect the Starter C2 harness connector.
4. Check for continuity between ground and the (T750) Starter Relay Output circuit at the Starter Relay 1 connector (pin 87) in the PDC.
  Is there continuity between ground and the (T750) Starter Relay Output circuit?
  
  Yes
  - Repair the (T750) Starter Relay Output circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 8
CHECK THE (T750) STARTER RELAY OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (T750) Starter Relay Output circuit -
  - between the PCM C1 harness connector and the Starter Relay 1 connector (pin 87) in the PDC.
  - between the Starter C2 harness connector and the Starter Relay 1 connector (pin 87) in the PDC.
  Is the resistance below 3.0 Ohms for both legs of the circuit?
  
  Yes
  - Go To 9
  No
  - Repair the (T750) Starter Relay Output circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
REPLACE STARTER RELAY 1 AND RETEST FOR DTC
1. Replace Starter Relay 1.
2. Reconnect the PCM C1 harness connector.
3. Attempt to crank the engine with the ignition key.
  Did the DTC return?
  
  Yes
  - Go To 10
  No
  - Replacing Starter Relay 1 repaired the fault.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Perform any Service Bulletins that apply.
2. Disconnect all PCM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
11. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .