Diagnostic Aids
- The system will go lean if an injector is not supplying enough fuel.
- A lean condition could be present during high fuel demand due to a fuel pump that does not pump enough fuel.
- Excessive resistance in the ignition 1 voltage and/or the fuel injector circuits may cause the following symptoms:
- A lean condition
- Misfire
- Rough idle
- Fuel contamination, such as water and alcohol, will effect the fuel trim.
- Review the Failure Records with a scan tool. If an intermittent condition is suspected, refer to Intermittent Conditions .
- This DTC may set due to poor idle characteristics. A possible cause may be uncontrolled fueling due to an open or high resistance in the HO2S 1 low signal circuit. Before replacing any component, ensure that this condition does not exist.