Diagnostic Test

CHECK FOR CHARGING SYSTEM DTCS
1. With the scan tool, read Powertrain Control Module (PCM) DTCs.
  Are any Charging System DTCs set?
  
  Yes
  - Repair Charging System DTCs. Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX .
  - Perform the Electronic Shift Module (ESM) VERIFICATION TEST. Refer to ELECTRONIC SHIFT MODULE (ESM) VERIFICATION TEST .
  No
  - Go To 2
CHECK IF VEHICLE WAS JUMP STARTED WITH 24-VOLT SYSTEM
NOTE:
Some Recreational Vehicles (RVs), Buses, and Semi Tractors use 24-volt systems.
1. Ask the customer if the vehicle was jump started by a vehicle with a 24-volt charging system.
  Was the vehicle jump started by a vehicle with a 24-volt charging system?
  
  Yes
  - This is the cause of the DTC. Erase the DTC and return the vehicle to the customer.
  - Perform the ESM VERIFICATION TEST. Refer to ELECTRONIC SHIFT MODULE (ESM) VERIFICATION TEST .
  No
  - Go To 3
CHECK INDICATED ESM BATTERY VOLTAGE
1. Start the Engine and raise the engine speed to 2, 000 rpm.
2. With the scan tool, read the ESM Battery Voltage for 60 seconds.
  Does the ESM Battery Voltage read above 16 volts at any time during the test?
  
  Yes
  - Go To 4
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure.
    Refer to TESTING FOR AN INTERMITTENT CONDITION .
COMPARE ESM VOLTAGE TO BATTERY VOLTAGE
1. Raise the engine speed to 2, 000 rpm.
2. With the scan tool, read the ESM Battery Voltage.
3. Measure the voltage at the Battery.
4. Compare the readings.
  Does the measured voltage reading match the scan tool ESM Battery Voltage reading?
  
  Yes
  - Repair the Charging System for an over charging condition in accordance with the Service Information.
  - Perform the ESM VERIFICATION TEST. Refer to ELECTRONIC SHIFT MODULE (ESM) VERIFICATION TEST .
  No
  - Go To 5
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 and record on the repair order.
  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.