Boost Pressure Sensor
NOTE:
If connector A is disconnected from the DME control module and the ignition is or was switched on, the 'DME Control Module TIMEOUT' fault is recorded in many control modules.
NOTE:
- In the case of the turbo engine, the intake air temperature sensor is integrated into the boost pressure sensor.
- In the naturally aspirated engine, the intake air temperature sensor is integrated into the MAF sensor 1 (right).
NOTE:
Turbo only: The wiring for DME control module connector A, pin 26, and boost pressure sensor connector, pin 2, is routed via the K plug connection, pin 8.
NOTE:
- Naturally aspirated engines only: In Step 7, the MAF sensor must not be removed, but only replaced complete with the tubular piece.
- This diagonal exchange is possible because both the MAF sensors (including tubular piece) are identical, but the intake air temperature sensor is only used on the right.
WORK INSTRUCTION CHART
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Is a turbo engine installed? | Turbo engine Go to step 2 |
Naturally aspirated engine Go to step 6 |
|
| 2 | Check intake air temperature sensor in the boost pressure sensor |
|
2,250 Ω - 2,560 Ω at 20°C Go to step 3 |
Intake air temperature sensor faulty => Replace boost pressure sensor → End |
| 3 | Check signal wire for continuity |
|
< 2 Ω Go to step 4 |
Repair wiring, eliminate cause of damage if necessary → End |
| 4 | Check ground wire for open circuit |
|
< 2 Ω Go to step 5 |
Repair wiring, eliminate cause of damage if necessary → End |
| 5 | Check ground wire for short circuit to B+ |
|
0 V Go to step 11 |
Repair wiring, eliminate cause of damage if necessary → End |
| 6 | Check MAF sensor |
|
2,250 Ω - 2,560 Ω at 20°C Go to step 8 |
Intake air temperature sensor faulty Go to step 7 |
| 7 | Exchange MAF sensors in diagonal sequence |
|
2,250 Ω - 2,560 Ω at 20°C => Make a note that the right MAF sensor has been exchanged with the left MAF sensor → End |
Intake air temperature sensor in left MAF sensor is also faulty => Replace one or both faulty MAF sensors. If only one MAF sensor is replaced, make sure that the new MAF sensor becomes the first sensor and is installed on the right. Clearly identify the other MAF sensor with the faulty intake air temperature sensor and install on the left. → End |
| 8 | Check signal wire for open circuit |
|
< 2 Ω Go to step 9 |
Repair wiring, eliminate cause of damage if necessary → End |
| 9 | Check ground wire for open circuit |
|
< 2 Ω Go to step 10 |
Repair wiring, eliminate cause of damage if necessary → End |
| 10 | Check ground wire for short circuit to B+ |
|
0 V Go to step 11 |
Repair wiring, eliminate cause of damage if necessary → End |
| 11 | Check whether additional faults have been recorded | Go to step 12 | Work through fault in accordance with instructions → End |
|
| 12 | Replace DME control module | To do this, you must observe the notes in the introduction on any potential causes of faults! | ||