154 Fuel Injector, Cylinder 3 - Below Limit

P1229

154 Fuel Injector, Cylinder 3 - Below Limit

Function
The coil of the fuel injector is supplied directly with B+ (battery voltage) on one side and with ground via an output stage in the DME control module on the other side.
This DTC is used to monitor the ground trigger.
Short circuit to ground and open circuit are detected when the output stage is blocked, short to B+ when the output stage is conducting.

Diagnosis conditions
- Engine running
- Battery voltage greater than 7 V

P1217 - P1241:

Wiring Diagram







NOTE: Short to B+ and open circuit cause the fuel injector to be continually closed. Short to ground causes the fuel injector to be permanently open.

Diagnosis Procedure







1 Check fuel injector.
1. Remove connector of injector 3.
2. Connect special tool V.A.G. 1315 A/1.
3. Connect ohmmeter to special tool V.A.G. 1315 A/1.

Display: 11 - 13 ohms at 20 °C.

2 Check wiring harness for short to B+ or to ground, or for open circuit.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Remove connector of fuel injector.
3. Connect ohmmeter to special tool 9637, pin III/15, and injector connector, pin 2.

Display: 0 - 5 ohms

4. Connect ohmmeter to special tool 9637, pin III/15, and ground.

Display: infinity ohms

5. Connect voltmeter to special tool 9637, pin III/15, and ground.

Ignition on.
Display: 0 V

If the measured values are not achieved, check wiring harness for chafing and pinching damage.

3 Perform adaptation.
1. Switch on the ignition.
2. Wait one minute. Do not press the accelerator.
3. Switch off the ignition for at least 10 seconds.
4. Read out the fault memory.