No Response From ESM (Shift Lever Assembly) - NAG1
NO RESPONSE FROM ESM (SHIFTER LEVER ASSEMBLY) - NAG1No Response From ESM (Shifter Lever Assembly) - NAG1:
POSSIBLE CAUSES
- (Z911) ground circuit open
- (F902) ignition unlock-run-start circuit open or shorted
- (D65) CAN C BUS (+) circuit open
- (D64) CAN C BUS (-) circuit open
- Shifter lever assembly
DIAGNOSTIC TEST
1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
With the scan tool, select ECU view.
NOTE:
- A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
- Check the FCM for any active CAN C hardware and any ignition related DTCs, perform DTCs before proceeding.
Q: Does the scan tool display a red X next to the module?
YES: Go To 2
NO: The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent , pushed out, and corroded terminals.
2. (Z911) GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Shifter Lever Assembly harness connector.
Using a 12-volt test light connected to 12-volts, check the (Z911) ground circuit.
Q: Does the test light illuminate brightly?
YES: Go To 3
NO: Repair the (Z911) ground circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST -VER 1. Transmission Verification Test
3. (F902) IGNITION UNLOCK-RUN-START CIRCUIT OPEN OR SHORTED
Turn the ignition on.
Using a 12-volt test light connected to ground, check the (F902) Ignition Unlock-Run-Start circuit.
Q: Does the test light illuminate brightly?
YES: Go To 4
NO: Repair the (F902) Ignition Unlock-Run-Start circuit for an open or short.
Perform NAG1 TRANSMISSION VERIFICATION TEST -VER 1. Transmission Verification Test
4. (D65) CAN C BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the FCM C1 harness connector.
Measure the resistance of the (D65) CAN C Bus (+) circuit between the FCM connector and the Shifter Lever Assembly connector.
Q: Is resistance below 5.0 ohms?
YES: Go To 5
NO: Repair the (D65) CAN C Bus (+) circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST VER 1. Transmission Verification Test
5. (D64) CAN C BUS (-) CIRCUIT OPEN
Measure the resistance of the (D64) CAN C Bus (-) circuit between the FCM connector and the Shifter Lever Assembly connector.
Q: Is resistance below 5.0 ohms?
YES: Replace the Shifter Lever Assembly.
Perform NAG1 TRANSMISSION VERIFICATION TEST -VER 1. Transmission Verification Test
NO: Repair the (D64) CAN C Bus (-) circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST -VER 1. Transmission Verification Test