Coolant Level Sensor Circuit

187

TM 9-2320-312-24-2

Troubleshooting Section

Results:

Yes

Yes The problem is in the vehicle wiring

between the bulkhead connector and the switch.

Repair: Perform the following repair:

Replace the faulty switch.

Inspect the vehicle wiring and repair the vehicle

Verify that the repair eliminates the problem.

wiring, as required. If the problem still exists with

the wiring, send the vehicle to the OEM dealer.

STOP.

No There is a problem in the harness between

No The problem is in the vehicle wiring between

the switch and the ECM. Proceed to Test Step 7.

the bulkhead connector and the ECM.

Test Step 7. Insert a Jumper at the

Bulkhead Connector.

Repair: Perform the following repair:

Inspect the vehicle wiring and repair the vehicle

Table 152

wiring, as required. If the problem still exists with

Clutch Switch Input Status Table

the wiring, send the vehicle to the OEM dealer.

Condition of Switch

Switch

Circuit

Status

STOP.

Bulkhead Wires are

Open

Disconnected.

i01683692

Bulkhead Wires are

Coolant Level Sensor Circuit -

OFF

Closed

Connected.

Test

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

SMCS Code: 7422-081

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

System Operation Description:

Crimp a Deutsch pin to each end of the wires.

Use this procedure under the following situation:

C. Find the terminal for the clutch switch. Also,

find the terminal for the sensor common for the

Use this procedure if any of the following diagnostic

AP sensor/switch. Look for the terminals in the

codes are active or easily repeatable:

engine side of the bulkhead connector for the

vehicle harness.

111-02 Coolant Level Sensor Fault (12)

D. Insert the jumper wire between the two terminals

111-03 Coolant Level Sensor Open Circuit (12)

in the engine side of the bulkhead connector.

111-04 Coolant Level Sensor Short Circuit (12)

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

Do not use this procedure for either of the following

F. Connect the electronic service tool to the cab

diagnostic codes:

data link connector.

111-01 Low Coolant Level Warning (62)

G. Access the status screen.

111-11 Very Low Coolant Level (62)

H. While the switch status is being monitored on the

status screen alternately remove the jumper wire

These diagnostic codes indicate a low coolant

between the two terminals, and alternately insert

level but not an electrical system malfunction.

the jumper wire between the two terminals.

Refer to Troubleshooting, "111-01 Low Coolant

Level Warning" or Troubleshooting, "111-11 Very

Refer to Table 152.

Low Coolant Level" for the proper troubleshooting

procedure.

Expected Result:

The following background information is related

The switch status changes per the information in

to this procedure:

Table 152.