P0111

DTC P0111

DTC Detecting Condition and Trouble Area






Wiring Diagram

Refer to P0101 DTC P0101.

DTC Confirmation Procedure

WARNING:

If you do not select a suitable route and take proper precautions when performing a road test, an accident can occur.

- Select a level road with no traffic to minimize the risk of accident.
- Perform the test extremely carefully.
- Perform the road test using 2 persons, a driver and an assistant.

NOTE:

- If DTCs other than aimed DTC are previously detected in DTC confirmation procedure, be sure to troubleshoot DTC previously detected.
- Check to make sure that the following condition is satisfied when using this procedure.

- ECT > 70 °C (158 °F)

1) Start engine and warm up to normal operating temperature.
2) Drive vehicle at 60 - 100 km/h (37 - 62 mile/h) for 10 min.

DTC Troubleshooting

1.
Was "Engine and Emission Control System Check" performed?
YES -
Go to Step 2.
NO -
Go to Engine and Emission Control System Check Engine and Emission Control System Check.

2. DTC check

Check DTC.

Is there DTC(s) other than P0111?
YES -
Go to applicable DTC(s).
NO -
Go to Step 3.

3. IAT sensor signal circuit and ground circuit check

Turn OFF ignition switch and disconnect connectors from MAF and IAT sensor and ECM.
Check for proper terminal connection to MAF and IAT sensor and ECM connectors.
If connections are OK, check that IAT sensor signal circuit (B1) and IAT sensor ground circuit (B2) are as follows.
- Wiring harness resistance of each IAT sensor signal circuit and ground circuit is less than 3 ohms.
- Insulation resistance of IAT sensor signal circuit is infinity between MAF and IAT sensor connector and vehicle body ground.
- Insulation resistance of wire harness is infinity between IAT sensor signal circuit terminal and each terminal at MAF and IAT sensor connector.
- Insulation resistance of wire harness is infinity between IAT sensor ground circuit terminal and each terminal at MAF and IAT sensor connector.
- Circuit voltage of each IAT sensor signal circuit and ground circuit is 0 - 1 V with ignition switch in ON position.

Are they in good condition?
YES -
Go to Step 4.
NO -
Repair or replace defective wire harness.

4. IAT sensor check

Check IAT sensor. Inspection

Is it in good condition?
YES -
Substitute a known-good ECM and recheck.
NO -
Replace MAF and IAT sensor.