Diagnostic Test

ENGINE CONTROL MODULE (ECM) or POWERTRAIN CONTROL MODULE (PCM) DTCs PRESENT
1. With the scan tool, read ECM or PCM DTCs.
  Are there any brake DTCs present?
  
  Yes
  - Refer to DTC INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 2
BCM DTCS PRESENT
1. With the scan tool, read BCM DTCs.
  Are there any BCM DTCs present?
  
  Yes
  - Refer to DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 3
(K321) BTSI CONTROL CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off to the lock position.
2. Disconnect the Shifter Lever Assembly harness connector.
3. Disconnect the BCM harness connector.
4. Turn the ignition on.
5. Measure the voltage between ground and the (K321) BTSI Control circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (K321) BTSI Control circuit for a short to voltage.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
  No
  - Go To 4
SHIFTER LEVER ASSEMBLY
1. Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits.
  Repair
  - Replace the Shifter Lever Assembly in accordance with the Service Information.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .