All Shift Select Buttons Remain Lit
- If this diagnostic was referred from another test, go to next step. If diagnostic started here, perform FUNCTION TEST under DIAGNOSIS & TESTING, then go to next step.
- Turn ignition off for at least 6 seconds, then turn ignition on (engine off). If mode and range shifts can now be made, go to next step. If mode and/or range shifts cannot be made, go to step 8.
- If shift modes can be made from 2HI to 4HI to 2HI, go to next step. If shift modes cannot be made, go to step 7.
- Turn ignition on (engine off). Check for battery voltage at TCCM terminal D2 (Light Green/Black wire) and terminal D16 (Purple wire). See Figure. If battery voltage is present at both pins, see RETRIEVING CODES under DIAGNOSIS & TESTING. If battery voltage is not present, go to next step.
- Turn ignition off. Check for open in Purple wire and Light Green/Black wire between select switch and TCCM. If open was found, go to next step. If no open was found, see RETRIEVING CODES under DIAGNOSIS & TESTING.
- With ignition off, repair open circuit(s), then go to FUNCTION TEST under DIAGNOSIS & TESTING.
- Turn ignition on (engine off). If 2HI cannot be selected, check for open between TCCM terminal C4 (Dark Green/White wire) and shift select switch. If 4HI cannot be selected, check for open between TCCM terminal C5 (Gray/Black wire) and shift select switch. If open is found, return to step 6. If no open is found, see RETRIEVING CODES under DIAGNOSIS & TESTING.
- Turn ignition on (engine off). Check for open between TCCM terminal D5 (Red/White wire) and motor/encoder. If an open is found, return to step 6. If no open is found, see RETRIEVING CODES under DIAGNOSIS & TESTING.