P020C

P020C-FUEL INJECTOR 3 PERFORMANCE

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Powertrain Control Module (PCM) can detect when unintended fuel injection occurs by monitoring fuel rail pressure and engine speed. If this condition occurs, the engine will typically die and not start. There will be exhaust smoke during cranking and no fuel rail pressure will be developed during cranking. This DTC will be active during cranking if this condition exists. Progressive cylinder damage may occur if the engine is operated for an extended period of time with this condition. This fault code is logged when the PCM determines that unintended fuel injection has occurred.

- When Monitored:
While the engine is running.

- Set Condition:
When the PCM determines that unintended fuel injection has occurred.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC
1. Engine running.
2. With the scan tool check for active DTCs and listen for an engine knock.

Is the DTC active and/or engine knocking?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test

2. CHECKING FOR A LEAKING FUEL INJECTOR
1. Turn the ignition off.
2. Use the fuel system leak tester blocking tool to block off Fuel Injector 3.
3. Start the engine and let idle for one minute.

Does the knock go away and/or P020A become inactive?

Yes

- Replace the Fuel Injector. If this DTC was accompanied by a Crankcase Pressure Sensor DTC, damage to cylinder may have occurred.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Diagnose engine for a mechanical failure.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.