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P1031,P1032

Symptom: The engine runs on only five cylinders. Diagnostic trouble code possibly generated in the MIU system (fuel consumption).

P1031 , P1032

Injector 3, output from control module low/high, no continuity or shorting to ground/batt+



Fault symptom

The engine runs on only five cylinders. Diagnostic trouble code possibly generated in the MIU system (fuel consumption).

Condition

No continuity or shorting to ground/B+ in the circuit to pin 35.

Diagnostic procedure

Note

Signals from injector 3 are sent to the main instrument for calculation of fuel consumption. In the event of a fault, a fault is probably also generated for the main instrument, see Service Manual 3:5 .

In connection with these diagnostic trouble codes there will probably also be a trouble code for incorrect fuel-air mixture.



1. Unplug the connector from the injector.

With the ignition switch in the Drive position, check whether battery voltage is present across pin 87 of the main relay and pin 1 of the injector connector.

If it is not, check the wiring between the valve and the relay.

2. Measure the resistance across pins 1 and 2 of the injector. The correct resistance is 15.9 ohms.

3. Take a reading across pins 1 and 2 of the injector connector. With the ignition in the Drive position (engine switched off), there should be no current or pulses across these pins.


Then start the engine and check that a reading of about 0.4 V is now obtained.

If a reading of about 0.4 V is obtained across pins 1 and 2, proceed to point 6.

If it is not, continue with the next point.

4. Check the wiring between the MOTRONIC control module and the injector for continuity/shorting.

5. If possible, drive the car to see whether any fault symptoms are still present. If they are, turn to for further diagnostic instructions.