Testing and Inspection of EPC Warning Lamp Operation
Cause:
Malfunction Indicator Lamp (MIL) is permanently activated by short to Ground (GND).
Corrective Action:
-
Switch ignition off.
-
Connect VAG1598/31 test box.
The control module is not connected by this action.
-
Check wire resistance between test box socket 47 and vehicle Ground (GND):
Specified value: Infinite Ohm
If the specification is not obtained:
Short to Ground (GND) in the activation wire from Motronic Engine Control Module (ECM) -J220- to Malfunction Indicator Lamp (MIL).
-
Locate and eliminate this malfunction using wiring diagram.
If the specification infinite Ohm is obtained and no short to Ground (GND) can be found:
Malfunction cause
Motronic Engine Control Module (ECM) -J220- malfunctioning.
-
Replace Motronic Engine Control Module (ECM) -J220-.
-
Display readiness code.
If DTC memory has been erased or the Motronic Engine Control Module (ECM) -J220- was disconnected from permanent battery (B+) voltage, the
readiness code must be generated again.