Neutral Switch Circuit

324

TM 9-2320-312-24-2

Troubleshooting Section

Test Step 5. Insert a Jumper Wire at the

1. Temporarily connect a test ECM.

Bulkhead Connector.

2. Remove all jumpers and replace all connectors.

A. Turn the ignition key switch to the OFF position.

3. Recheck the system for active diagnostic

codes.

B. Fabricate a jumper wire 100 mm (4 inch) long.

Crimp a Deutsch pin to each end of the wire.

4. Repeat the test step.

C. Locate the suspect switch socket in the engine

5. If the problem is resolved with the test ECM,

side of the ECM bulkhead connector.

reconnect the suspect ECM.

D. Insert the wire jumper pin between the switch

6. If the problem returns with the suspect ECM,

socket and the sensor common connection.

replace the ECM.

Install the jumper wire on the engine side of the

ECM bulkhead connector.

7. Verify that the repair eliminates the problem.

E. Turn the ignition key switch to the ON position.

STOP.

F. Alternately connect and then disconnect the

Test Step 4. Insert a Jumper Wire at the

jumper wire. At the same time, monitor the status

Switch.

screen on the electronic service tool.

Expected Result:

A. Turn the ignition key switch to the OFF position.

The switch status changes from "ON" with the

B. Reconnect the ECM vehicle harness connector

jumper wire in place. The switch status changes to

J1/P1.

"OFF" when the jumper wire is removed.

C. Fabricate a jumper wire 100 mm (4 inch) long.

Results:

Crimp a Deutsch pin to each end of the wire.

Yes The problem is in the vehicle wiring

D. Insert the jumper wire between the two switch

terminals.

between the bulkhead connector and the switch.

Inspect the vehicle wiring and then repair the

E. Turn the ignition key switch to the ON position.

vehicle wiring. Otherwise, send the vehicle to

the OEM dealer for repair. Verify that the original

F. Alternately remove the jumper wire and then

condition is resolved. STOP.

insert the jumper wire at the switch terminals. At

No The problem is in the vehicle wiring between

the same time, watch the status screen on the

electronic service tool.

the bulkhead connector and the ECM. Inspect

the vehicle wiring and then repair the vehicle

wiring. Otherwise, send the vehicle to the OEM

Expected Result:

dealer for repair. Verify that the original condition

The switch status changes to "ON" with the jumper

is resolved. STOP.

wire in place. The switch status changes to "OFF"

when the jumper wire is removed.

i01604768

Neutral Switch Circuit - Test

Results:

Yes

SMCS Code: 1900-081-ZS

Repair: Replace the switch.

System Operation Description:

Verify that the repair eliminates the problem.

Use this procedure under the following situation:

STOP.

Use this procedure to determine if the neutral switch

is preventing normal operation of cruise control, fast

No There is a problem in the wire harness

idle, idle set speed, or PTO operation:

between the switch and the ECM. Proceed to Test

Step 5.