0111-01 Low Coolant Level Warning (62)

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TM 9-2320-312-24-2

Troubleshooting Section

GMT-560 applications have the option of using a

i01724991

2-pin switch to monitor coolant level. To use a 2-pin

0111-01 Low Coolant Level

switch, the parameter "Manufacturer/Model" must

Warning (62)

be programmed to "GMT-560" and the parameter

"Coolant Level Sensor" must be programmed

to "2-pin switch". The diagnostic fault codes for

SMCS Code: 7422-038

the coolant level sensors are disabled when the

"Coolant Level Sensor" parameter is programmed

Conditions Which Generate This Code:

to "2-pin switch". The switch is connected to

P1/J1:49 ( coolant level switch) and to P1/J1:5

This condition indicates that the coolant level is

(AP sensor/switch sensor common). If the coolant

low. "Engine Monitoring" must be programmed to

level is normal, the switch should be closed and

"WARNING", "DERATE", or "SHUTDOWN", and

P1/J1:49 connected to ground. The warning lamp

the parameter "Coolant Level Sensor" must be

will be illuminated via the J1939 data link when the

programmed to "4-pin", "2-pin switch", or "2-wire

coolant is low.

float sensor" before this diagnostic code can occur.

Test Step 1. Check the Level of the

Note: This diagnostic code represents an event. This

Coolant

diagnostic code does not represent an electronic

system fault.

Visually check the level of the coolant. Ensure that

the coolant level switch is fully immersed in the

System Response:

coolant.

Electronic System Response The ECM does not

Expected Result:

derate the power. Also, the ECM does not limit

the engine rpm or the vehicle speed due to this

The coolant is at the proper level.

diagnostic code.

Results:

The Check Engine Lamp will flash and the Warning

Lamp will illuminate.

OK Proceed to Test Step 2.

This diagnostic code requires a Customer Password

Not OK

in order to be cleared.

Repair: Fill the cooling system with the proper

Service Tool Display or Lamps The Caterpillar

coolant to the correct level. For further information,

Electronic Technician (Cat ET) will indicate "LOW"

refer to the Operations and Maintenance Manual.

and "DIAG" next to "Engine Coolant Level"on the

status screen while the diagnostic code is active.

STOP.

Engine Response This diagnostic code does not

Test Step 2. Inspect Electrical Connectors

affect engine power.

and Wiring

Troubleshooting:

A. Thoroughly inspect the following connectors:

If the vehicle is equipped with the 2-Pin Switch,

J1/P1 ECM vehicle harness connector

proceed with the following steps.

Harness for the connector to the coolant level

2-Pin Switch

switch

Connector terminals for the switch

Refer to Troubleshooting, "Electrical Connectors

- Inspect" for details.

B. Perform a 45 N (10 lb) pull test on each of the

wires in the ECM connector that are associated

with the appropriate diagnostic code.

C. Check the ECM connector (allen head screw) for

the proper torque of 6.0 Nm (55 lb in).