AD07.52-S-4000A | PEC fuel injection and ignition system diagnosis fault memory | 5.5.97 |
ENGINE 111.948 /978 in MODEL 638
Fuel injection and ignition system (PEC) diagnosis, previous knowledge | |||
Connect Hand-Held Tester (HHT) and read out DTC memory | |||
DTC memory | |||
Fault code | Fault text | Possible cause/Note | Remedy |
|
| NTC temperature sensor –//– Implausible Loose contact | Cables, NTC temperature sensor | |
|
| NTC intake air sensor –//– Loose contact | Cables, NTC intake air sensor | |
| Intake manifold absolute pressure control module Implausible Missing | Vacuum line, sensor in control module | |
|
| Closed throttle position contact (idle speed control actuator) Implausibly closed Loose contact Implausibly open | Cables, idle speed control actuator | |
|
| Throttle valve actual value potentiometer Implausibly high Implausibly low Loose contact | Cables, idle speed control actuator | |
|
| Drive actual value potentiometer (throttle valve) Implausibly high Implausibly low Loose contact | Cables, idle speed control actuator | |
|
| Idle speed control on lower control stop on upper control stop in emergency-running mode | Leak air, throttle valve jams (possibly only temporarily), idle speed control in emergency-running mode. Eliminate current and stored faults. | Reset and re-activate memory of PEC control module. If the fault is displayed again: |
|
| Oxygen sensor Sensor voltage too high Sensor cold –//– Sensor signal implausible | Cables, oxygen sensor | |
|
| Oxygen sensor heating current too low too high | Cables, oxygen sensor | |
|
| Lambda control rich stop/mixture too lean too rich | Leak air, fuel injection valves, diaphragm pressure regulator, wear on engine, defective purging (switchover valve) | |
|
| Injection valve (cylinders 1 and 4) +, thermal shutoff –//–, – | Cables, fuel injection valves | |
|
| Injection valve (cylinders 2 and 3) +, thermal shutoff –//–, – | Cables, fuel injection valves | |
|
| Closed throttle position self-adaptation too rich too lean | Leak air, fuel injection valves, diaphragm pressure regulator in fuel distributor pipe, wear on engine, defective purging (switchover valve) | |
|
| Part-load self-adaptation too rich too lean | Leak air, fuel injection valves, diaphragm pressure regulator in fuel distributor pipe, wear on engine, defective purging (switchover valve) | |
|
| Ignition output stage 1 (cylinders 1 and 4) + fails Current value not achieved | Cables, spark plugs, ignition coil | |
|
| Ignition output stage 2 (cylinders 2 and 3) + fails Current value not achieved | Cables, spark plugs, ignition coil | |
|
| Crankshaft position sensor and magnet for position sensor on flywheel sector Not recognized/implausible Magnet missing Speed implausibly high | Cables, position sensor, magnet on flywheel sector | |
|
| PEC resistance trimming plug – –//–, + | PEC resistance trimming plug | |
|
| Speed signal DI/KSS (output) – + | Cable | |
|
| Vehicle speed signal Not recognized Implausibly high | Cable, vehicle speed sensor in transmission | |
|
| Fuel pump relay –//–, + –, thermal shutoff | Cables, fuel pump relay | |
|
| Purge control valve –//–, + –, thermal shutoff | Cables, purge control valve, defective purging | |
|
| Short-term self-adaptation, closed throttle position/part-load exceeded | Short-term fault in mixture preparation | |
|
| Control module Undervoltage | Cables, battery | |
|
| Immobilizer (on vehicles with DAS) DAS –//–, + DAS – DAS disabled DAS implausible | Cable, inadvertent wrong operation, FFB control module | |
|
| Exhaust gas valve –//–, – + | Cables, exhaust gas valve switchover valve | |
|
| Transmission protection (on vehicles with automatic transmission) –, transmission protection too long –//–, + | Cable, fault in automatic transmission If the fault occurs on vehicles with manual transmission, the control module version has not been programmed or reset. |
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