Reduced or No Mode and Range Shift Operation. Isuzu S/T Isuzu

For 1990-2009 cars only

Makes 🢒 Isuzu 🢒 1999 🢒 S/T Isuzu - 4WD 🢒 Driveline/Axle 🢒 Transfer Case - NVG 233-NP1 (Two Speed Selectable) 🢒 Reduced or No Mode and Range Shift Operation

Step	Action	Value(s)	Yes	No
1	Were you sent here from a diagnostic table?	Go to Step 2	Refer to Electric Shift Transfer Case Functional Test
2	Ensure the electrical harness connector and pins to the motor/encoder are clean and not corroded. Ensure the electrical harness connector to the motor/encoder is properly installed. Check the following CKT between the motor/encoder and the TCCM. Check for opens and grounds on CKT 31, CKT 940, CKT 1552, CKT 1553 and CKT 1555. Check for opens and grounds on CKT 1556, CKT 1557 and CKT 1558. Are any opens or grounds found on any of the CKT?	Go to Step 3	Refer to Perform a Diagnostic On the TCCM
3	Ensure the ignition switch is position to OFF. Repair the open or ground in the CKT. Is the repair completed?	Refer to Electric Shift Transfer Case Functional Test	--

Step

Action

Value(s)

Yes

Were you sent here from a diagnostic table?

Go to Step 2

Refer to Electric Shift Transfer Case Functional Test

Ensure the electrical harness connector and pins to the motor/encoder are clean and not corroded.
Ensure the electrical harness connector to the motor/encoder is properly installed.
Check the following CKT between the motor/encoder and the TCCM.
Check for opens and grounds on CKT 31, CKT 940, CKT 1552, CKT 1553 and CKT 1555.
Check for opens and grounds on CKT 1556, CKT 1557 and CKT 1558.

Are any opens or grounds found on any of the CKT?

Go to Step 3

Refer to Perform a Diagnostic On the TCCM

Ensure the ignition switch is position to OFF.
Repair the open or ground in the CKT.

Is the repair completed?

Refer to Electric Shift Transfer Case Functional Test