DTC Troubleshooting
DTC TROUBLESHOOTING PROCEDURES
| Step |
Action |
YES |
NO |
| 1 |
Was "Engine and Emission Control System Check" performed? |
Go to Step 2. |
Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK . |
| 2 |
DTC check
Is there any DTC(s) other than P0030? |
Go to applicable DTC diag. flow. |
Go to Step 3. |
| 3 |
Wire harness check
- Disconnect connectors from A/F sensor and ECM with ignition switch turned OFF.
- Check for proper connection to A/F sensor terminals and ECM terminals.
- If connections are OK, check that A/F sensor circuit is as follows.
- Insulation resistance of wire harness is infinity between "Signal (+) circuit of A/F sensor" terminal and each other terminal at A/F sensor connector.
- Wiring harness resistance of "Signal (+) circuit of A/F sensor", "Signal (-) circuit of A/F sensor", "Control circuit of A/F sensor heater" and "Control ground circuit of A/F sensor heater" is less than 1 Ω.
Are they in good condition?
|
Replace A/F sensor and recheck. If this DTC is detected again, substitute a known-good ECM. |
Repair or replace defective wiring harness / connector. |