Cylinder 4 Injector A Circuit Low

Where it lives

For P0270, the injector sits on the circuit this code reports. The description of P0270 puts it on cylinder 4.

Check these first

• A faulty or dirty cylinder 4 fuel injector
• A short to ground in the injector 4 control wire
• An open in the injector 4 circuit
• Corrosion in the injector 4 connector
• A blown injector circuit fuse

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 connector and harness for corrosion or a short
4. Check the injector circuit fuse
5. Replace injector 4 if its coil is open or shorted
6. Clear the code and retest

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