Diagnostic Test

CHECK FOR ENGINE CHARGING SYSTEM DTCS
1. With the scan tool, read Powertrain Control Module (PCM) DTCs.
  Are any Engine Charging System DTCs set?
  
  Yes
  - Repair Engine Charging System DTCs. Refer to DIAGNOSTIC CODE INDEX .
  - Perform the Electronic Shift Module (ESM) VERIFICATION TEST. Refer to ELECTRONIC SHIFT MODULE (ESM) VERIFICATION TEST .
  No
  - Go To 2
CHECK FOR AN ACTIVE DTC
1. With the scan tool, read ESM DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read ESM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 3
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK ESM POWER CIRCUIT
1. Turn the ignition off.
2. Allow the vehicle BUS to go to Sleep, (approximately 30 seconds), ESM lights off.
3. Disconnect the ESM harness connector.
4. Turn the ignition on.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
5. Using a 12-volt test light connected to ground, check the ESM battery power circuit at the ESM harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the ESM power circuit for an open or high resistance.
  - Perform the ESM VERIFICATION TEST. Refer to ELECTRONIC SHIFT MODULE (ESM) VERIFICATION TEST .
CHECK GROUND CIRCUIT
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the ESM ground circuit in the ESM harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the ground circuit for an open or high resistance.
  - Perform the ESM VERIFICATION TEST. Refer to ELECTRONIC SHIFT MODULE (ESM) VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all ESM 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.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all ESM 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. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read ESM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the ESM in accordance with the Service information. Refer to MODULE, ELECTRONIC SHIFT (ESM), REMOVAL AND INSTALLATION .
  - Perform the ESM VERIFICATION TEST. Refer to ELECTRONIC SHIFT MODULE (ESM) VERIFICATION TEST .
  No
  - Perform the ESM VERIFICATION TEST. Refer to ELECTRONIC SHIFT MODULE (ESM) VERIFICATION TEST .
  - Test complete.