Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK FOR AN ACTIVE DTC
NOTE:
If the Shifter and the Electronic Vehicle Information Center (EVIC) is correctly displaying PARK (not flashing), this indicates the Transmission Control Module (TCM) is sending a Controller Area Network (CAN) message that the Transmission is in the park position.
1. With the scan tool, read all DTCs and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. With the scan tool, erase DTCs.
4. 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.
5. With the scan tool, read TCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR ACTIVE CAN BUS DTCS
1. Check for an active DTC lodged against the BCM or TCM.
  Are there any active CAN BUS DTCs lodged against the TCM or BCM?
  
  Yes
  - Perform the appropriate Diagnostic Test in accordance with Service Information.
  No
  - Go To 3
CHECK THE (T824) PARK CIRCUIT VOLTAGE
1. Turn the ignition off.
2. Disconnect the BCM C4D harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (T824) TRS Park Signal circuit at the BCM harness connector.
  Is the voltage above 10.0 volts?
  
  Yes
  - Go To 4
  No
  - Go To 5
CHECK THE BCM C4D HARNESS CONNECTOR
1. Check the terminals in the BCM C4D harness connector for damaged or loose terminals, or terminals that are backed out of the connector.
  Were any Problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Replace the BCM in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
CHECK THE (T824) PARK CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Disconnect the Radio Frequency (RF) Hub C1 harness connector.
2. Measure the resistance of the (T824) TRS Park Signal circuit between the BCM C4D connector and the RF Hub C1 harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (T824) TRS Park Signal circuit for an open or high resistance.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
CHECK (T824) PARK CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (T824) TRS Park Signal circuit at the BCM harness connector.
  Is there continuity between ground and the (T824) TRS Park Signal circuit?
  
  Yes
  - Repair the (T824) TRS Park Signal circuit for a short to ground.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Using the schematics as a guide, check the RF Hub connector and all related in-line connector terminals for corrosion, damage, or pushed out terminals. Pay particular attention to power and ground circuits. Check Service Bulletins for possible causes that may apply. If no problems are found, replace and program the RF Hub in accordance with the Service Information. Refer to MODULE, RADIO FREQUENCY (RF HUB), REMOVAL .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .