AD07.52-S-5000A | PEC fuel injection and ignition system diagnosis troubleshooting | 6.5.97 |
ENGINE 111.948 /978 in MODEL 638
Connection and use of test equipment | |||
Fuel injection and ignition system (PEC) diagnosis, previous knowledge | |||
Troubleshooting | |||
Complaint | Possible cause | Notes | Remedy/Test step |
Engine difficult to start and responds badly to opening the throttle | NTC temperature sensor Fuel injection valves, actuation and injection time PEC resistance trimming plug | ||
Engine does not start | PEC control module voltage supply Crankshaft position sensor Fuel pump relay Fuel injection valves, actuation and injection time Fuel pump Ignition output stages 1 and/or 2 Inadvertent wrong operation of radio frequency remote control with immobilizer (DAS) Radio frequency remote control with immobilizer (DAS) not unlocked correctly. | ||
Engine idles unevenly | Oxygen sensor Throttle valve flutters Fuel injection valves, actuation and injection time Fuel injection valves, leaktightness and spray pattern Fuel pressure |
Idle speed control actuator (M33) | |
Engine idles unevenly when A/C compressor is switched on (A/C compressor signal on vehicles with standard climate control) | A/C compressor signal when A/C compressor is switched on Mechanical end stop of closed throttle valve not recognized. | Measure at coupling 1, pin 12 of PEC control module: OFF = 0 V ON = 12 V Programming control module | |
Engine idles unevenly when ancillaries are switched on | Idle speed control actuator Mechanical end stop of closed throttle valve not recognized. |
Programming control module |
Referenced documents
- ad0000s1000az Connection and use of testing equipment
- ad0752s200004a PEC fuel injection and ignition system programming control module version
- ad0752s2000a PEC fuel injection and ignition system diagnosis previous knowledge
- ad0752s600001a PEC fuel injection and ignition system test of electrical system coolant temperature sensor
- ad0752s600004a PEC fuel injection and ignition system test of electrical system idle speed contact
- ad0752s600008a PEC fuel injection and ignition system test of electrical system O2 sensor
- ad0752s600011a PEC fuel injection and ignition system test of electrical system injector cylinders 1 and 4
- ad0752s600012a PEC fuel injection and ignition system test of electrical system injector cylinders 2 and 3
- ad0752s600015a PEC fuel injection and ignition system test of electrical system ignition output stage 1 cylinders 1 and 4
- ad0752s600016a PEC fuel injection and ignition system test of electrical system ignition output stage 2 cylinders 2 and 3
- ad0752s600017a PEC fuel injection and ignition system test of electrical system crankshaft position sensor
- ad0752s600018a PEC fuel injection and ignition system test of electrical system reference resistor
- ad0752s600021a PEC fuel injection and ignition system test of electrical system fuel pump relay
- ad0752s600024a PEC fuel injection and ignition system test of electrical system control module
- ad0752s600025a PEC fuel injection and ignition system test of electrical system immobilizer