Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read all DTCs and record on the repair order.
2. Record the Event Data and Environmental Data.
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 TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK (T1) TRANSMISSION RANGE SWITCH (TRS) SIGNAL CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the TCM harness connector.
3. Disconnect the Transmission assembly harness connector.
4. Measure the resistance of the (T1) TRS signal circuit between the TCM harness connector and the transmission assembly harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the (T1) TRS signal circuit for an open.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
CHECK (T1) TRS SIGNAL CIRCUIT FOR A SHORT TO GROUND OR A SHORT ANOTHER CIRCUIT
1. Check for continuity between ground and the (T1) TRS Signal circuit at the TCM harness connector.
2. Check for continuity between the (T1) TRS Signal circuit and all other circuits at the TCM harness connector.
  Is there continuity between the (T1) TRS Signal circuit and ground or another circuit?
  
  Yes
  - Repair the (T1) TRS signal circuit for a short to ground or short to another circuit.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
  No
  
  NOTE:
  If this Electronic Control Unit (ECU) is being replaced with a new unit, a diagnostic scan tool MUST be used to align the PROXI configuration data into the new ECU. Follow the routine outlined in the diagnostic scan tool for PROXI Configuration Alignment under Body Control Module (BCM) Miscellaneous Functions menu.
  - Using the schematics as a guide, check the TCM connector and all related in-line connector terminals for corrosion, damage, or pushed out terminals. Pay particular attention to the power and ground circuits. If no problems are found, replace the TCM and perform programming procedures. (Refer to TCM PROGRAMMING-948TE ).
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
  - If vehicle does not pass the Transmission Verification Test, replace the TRS in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .