3126B and 3126E On-highway Engines Caterpillar

0111-02 Coolant Level signal invalid (12)

Usage:

3126B 1AJ

Conditions Which Generate This Code:

This condition occurs when the coolant level sensor signals indicate a low condition and a normal condition at the same time. "Engine Monitoring" must be programmed to "WARNING", "DERATE", or "SHUTDOWN", and the parameter "Coolant Level Sensor" must be programmed to "4-pin", or "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.

System Response:

Electronic System Response The ECM sets the Coolant Level to OK while this diagnostic code is Active.

Service Tool Display or Lamps The Caterpillar Electronic Technician (ET) will indicate "LOW" and "DIAG" next to "Engine Coolant Level"on the status screen while the diagnostic code is active. The check engine lamp will not come on unless the diagnostic code has been continuously active for 10 hours.

Engine Response There is no effect on engine response due to this diagnostic code.

Test Step 1. Perform the following diagnostic procedure: Coolant Level Sensor Circuit - Test

Results:

OK - STOP

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