AD07.52-D-5000A | PEC fuel injection and ignition system diagnosis troubleshooting | 23.5.97 |
ENGINE 111.979 in MODEL 901, 902, 903, 904
| PEC fuel injection and ignition system diagnosis, previous knowledge | ||
Complaint | Possible cause | Notes | Remedy/test step |
Transmission variant not recognized by control module | Programming incorrectly carried out | Start engine and V-signal > 10 km/h | |
Vehicle version still not recognized | |||
Engine starts badly and accelerates poorly | Coolant temperature sensor Fuel injection valves, actuation and injection time Trim coupling | ||
Engine does not start | Voltage supply control module Crankshaft position sensor Fuse F61, fuel pump relay, fuel pump Fuel injection valves, actuation and injection time Ignition output stage 1 and/or 2 | ||
Engine has irregular idle speed | O2 sensor Throttle valve actuator motor, throttle valve flutters Fuel injection valves, actuation and injection time Fuel injection valves, leak-tightness and ejection pattern Fuel pressure | ||
Engine idle speed is irregular after switching on A/C compressor (vehicles with air conditioning system) | Idle speed increase signal from air conditioning system control module Mechanical limit stop of closed throttle valve not recognized | ||
Engine idle speed is irregular when consumers switched on | Throttle valve actuator motor Mechanical limit stop of closed throttle valve not recognized |