0111-02 Coolant Level Sensor Fault (12)

125

TM 9-2320-312-24-2

Troubleshooting Section

Test Step 4. Check the Harness for the

D. Check the harness and wiring for abrasion and

Coolant Level Switch

pinch points from the appropriate sensor back

to the ECM.

A. Connect Cat ET to the cab data link connector.

Expected Result:

B. Insert a jumper between terminal J1:49 and

All connectors, pins and sockets should be

terminal J1:5.

completely coupled and/or inserted and the harness

and wiring should be free of corrosion, abrasion

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

or pinch points.

Monitor the active diagnostic code screen.

Results:

Expected Result:

OK Proceed to Test Step 3.

The "Low Coolant Level Warning" event code

becomes inactive when the terminals are shorted.

Not OK

Results:

Repair: Repair the connectors or wiring and/or

replace the connectors or wiring. Ensure that all

Yes The problem is in the harness wiring.

of the seals are properly in place and ensure that

the connectors are completely coupled. Verify

Repair: Repair the wiring or replace the wiring,

that the repair eliminates the problem.

as required.

STOP.

Test Step 3. Check the Coolant Level

No The problem is on the ECM side.

Switch

Repair: Temporarily connect a test ECM. Ensure

that the parameters for "Engine Monitoring" and

A. Connect Cat ET to the cab data link connector.

"Coolant Level Sensor" are programmed to match

the old ECM. If the problem is resolved with the

B. Remove the connector to the coolant level switch.

test ECM, reconnect the suspect ECM. If the

problem returns with the suspect ECM, replace

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

the ECM.

Monitor the active diagnostic code screen.

D. Short the terminals on the connector to the

STOP.

coolant level switch.

i01597369

Expected Result:

0111-02 Coolant Level Sensor

The "Low Coolant Level Warning" code becomes

Fault (12)

inactive when the terminals are shorted.

SMCS Code: 7422-038

Results:

Conditions Which Generate This Code:

Yes There is a problem with the coolant level

switch.

This condition occurs when the coolant level sensor

signals indicate a low condition and a normal

Repair: Replace the coolant level switch.

condition at the same time. "Engine Monitoring"

must be programmed to "WARNING", "DERATE",

Ensure that the repair eliminates the problem.

or "SHUTDOWN", and the parameter "Coolant

Level Sensor" must be programmed to "4-pin", or

STOP.

"2-wire float sensor" before this diagnostic code

can occur. If the parameter "Coolant Level Sensor"

is programmed to "2-pin switch", this diagnostic

code is disabled.

Repair: Reconnect the connector for the coolant

level switch.

System Response:

Proceed to Test Step 4.

Electronic System Response The ECM sets the

Coolant Level to OK while this diagnostic code is

Active.