P1051

DIAGNOSTIC TROUBLE CODES P1051, P1052
Injector 5, control module output, no continuity or shorting to ground/batt+

Fault Symptom.
The engine runs on only five cylinders.

Condition
In the event of a short circuit or open circuit a diagnostic trouble code will be generated.

Diagnostic Procedure.
1. The injectors are not easily accessible but their electrical concurrences all go to connector H10-26, a 10-pin connector on the engine.
Unplug connector H10-26.
Check the power supply for the injectors.
Ignition switch in the ON position.
Connect the test lamp across pin 6 of the male connector and battery negative.
- The test lamp should light up.

If it does not, the fault is in the lead between pin 1 of the injector connector and crimped connection J125.
If it does, continue with step 2.

2. Check the resistance of the injector.
Measure the resistance across pins 3 and 6 of female connector H10-26.
- Nominal resistance is 15.9 ± 0.5 ohm, at 20°C.

If the measured value is correct, continue with step 3.
If it is not, check the lead between the injector and the 10-pin connector for continuity/shorting.
- Disconnect the lead from the injector before checking it.
- If the lead is OK, fit a new injector.





3. Check that the control module produces trigger pulses.
Connect the test lamp across pins 3 and 6 of male connector H10-26.
Run the starter motor.
- The test lamp should flash.

If the test lamp flashes, continue with step 4.
If it does not, check the lead between pin 3 of connector H10-26 and pin 15 of the control module for continuity/shorting.

4. Clear the diagnostic trouble code and drive the car to see whether the DTC is generated again.

If the diagnostic trouble code is generated again, continue at "Procedure Before ECM Replacement". Component Tests
If the trouble code is not generated again the remedial measure taken was correct, otherwise the fault is of intermittent type.