Poor driveability, reduced performance, uneven idling speed: Checklist
- Describe the fault symptom.
- Connect Tech 2.
- Turn off A/C or ACC and let the engine idle. Coolant temperature should be over 80°C.NOTE: Diagnostic trouble codes must not be erased.
- Read and note any diagnostic trouble codes:
- Select "Engine" - "Engine management system" - "Read values / Activate" in Tech 2. Read and note the following values:
CHECK LIST
| Unit | Turn Ignition On | Idle | Desired value | |||
|---|---|---|---|---|---|---|
| Engine speed | rpm | ------------- | 700-1000 | |||
| Fuel mass/Combustion | mg/c | ------------- | 3 - 20 | |||
| Air mass/Combustion (1) | mg/c | ------------- | 200 - 400 | |||
| Requested air mass/Combustion (1) | mg/c | ------------- | 200 - 400 | |||
| EGR valve PWM (1) | % | ------------- | 5 - 95 | |||
| EGR valve feedback signal | % | ------------- | 85 - 95 | |||
| Mass air flow sensor | V | 0.85 - 1.15 | ||||
| Coolant temperature | °C | 80-100 | ||||
| Oil temperature, engine | °C | 60 - 120 | ||||
| Fuel temperature | °C | 0 - 80 | ||||
| Intake air temperature | °C | 20 - 60 | ||||
| Atmosphere Absolute Pressure | kPa | 90-115 | ||||
| Charge Air Absolute Pressure | kPa | 90 - 115 | ||||
| Additive adaptation | mg/c | max. 0.6 | ||||
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NOTE:
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Under "system information" are details on Vehicle Identification Number and version number for PSG16
CHECK LIST (SYSTEM INFORMATION)
| Vehicle Identification Number (compulsory) | |
| Software Module Identifier #1 or Software version (compulsory) | |
| Programming date (compulsory) |