Monitor DTC Status

P2178 System Too Rich Off Idle

Scantool Diagnostics - Monitor Scantool Data

Monitor Scantool Data

1. Connect scantool to Data Link Connector (DLC).
2. Warm up the engine to normal operating temperature.
3. Monitor the "Parameters related to air/fuel ratio (HO2S, MAF, MAP, TPS, ECTS, PCSV, Injector, etc)" on the scantool.




4. Are the parameters displayed correctly?
YES
1) Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.
NO
1) Go to "Terminal & Connector Inspection" procedure