Electronic Engine Power Control (EPC), Significance

Electronic Engine Power Control (EPC) Warning Light In Instrument Cluster, Significance

"EPC" stands for Electronic Power Control and refers to the electronic throttle control system.







Component location of EPC warning light

The engine control module switches the EPC warning light on when the ignition is switched on.

After the engine has been started, the engine control module tests all important parts of the electronic throttle control system for functionality.

During the test sequence the EPC warning light comes on for about 3 seconds. If a malfunction is detected during this test phase the malfunction indictor light will remain lit.

If a malfunction is detected in the electronic throttle system while the engine is running, the engine control module will activate the EPC warning lamp (see DTC Table for list of possible malfunctions). At the same time a DTC code is stored in the DTC memory of the engine control module.

Checking function of warning light
- Start engine.

Specification: If no malfunctions relating to the electronic throttle are stored in the DTC memory, the EPC warning light should light up for about 3 seconds after the engine is started.

If the EPC malfunction indicator light does not light up:
- Check wiring from engine control module to EPC warning light in instrument cluster as follows:
- Check DTC memory of engine control module.
- Display readiness code. The readiness code must be generated if the DTC memory was erased.
Readiness Code, Function
Readiness Code, Generating