AD07.52-S-3004A | PEC fuel injection and ignition system diagnosis operational check actual values (chassis dynamometer) | 5.5.97 |
ENGINE 111.948 /978 in MODEL 638
| The test specifications are minimum performances. Vehicle speed not more than 130 km/h; use workshop test tires. It is not possible to simulate the coolant temperature and intake air temperature, system-related in PEC. Ensure adequate cooling with blower when measuring performance at full load. | ||
PEC fuel injection and ignition system diagnosis previous knowledge | |||
Operational check | |||
Actual value no. | Actual value | Specification | Possible cause / Remedy |
| Coolant temperature | > 80 °C | |
| Engine speed | 5000 rpm | |
| Injection time | 8-11 ms | |
| Intake manifold pressure (AC compr. off) | < 60 mbar | |
| Ignition angle | M111.948: 25-29 °CRA M111.978: 24-28 °CRA Depends on reference resistor used | |
| Intake air temperature | 20-35 °C | |
| Full load contact | Readout: ON | |
| Speed signal | > 100 km/h | |
| Ignition coil operating period | 1.7-2.3 ms | |
| Ignition coil operating voltage | 30-35 V | |
| Ignition coil fault counter | < 50 | |
| Vehicle speed limit active | Readout: NO |