3126B and 3126E On-highway Engines Caterpillar

The ECM detected one of the following conditions:

• Open circuit

• Short to ground

• Short to + battery

• Short across the solenoid when the engine is running.

System Response:

Electronic System Response The ECM will cycle the control valve for the injection actuation system on and off. The ECM will cycle the control valve several times in a second when the engine is running. The fault is active.

Engine Response The engine will stop running if the signal line for the control valve for the injection actuation system is shorted to ground.

If the pressure sensor common for the control valve is shorted to ground, the following conditions may exist:

• The engine may continue to run.

• The idle may be unstable.

Test Step 1. Perform the following diagnostic procedure: Injection Actuation Pressure Control Valve Circuit - Test

Results:

• OK - STOP