Cylinder 4 Injector A Circuit High

Where it lives

For P0271, the circuit described runs through the injector. The description of P0271 puts it on cylinder 4.

Check these first

• A short to voltage in the injector 4 control wire
• High resistance in the injector 4 circuit
• A faulty cylinder 4 fuel injector
• Corrosion in the injector 4 connector
• A failed injector driver in the PCM

What to do next

1. Ohm test injector 4 and compare to the other injectors
2. Backprobe the injector 4 control wire for a pulse with a noid light
3. Inspect the injector 4 wiring for a short to voltage
4. Check for corrosion in the injector 4 connector
5. Test the PCM injector driver if the wiring and injector are good
6. Clear the code and retest

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