| 1 |
CHECK GROUND CONNECTIONS
- Turn ignition switch OFF.
- Loosen and retighten three ground screws on the body. Refer to
[POWER SUPPLY AND GROUND CIRCUIT CHECK
].
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OK or NG |
GO TO 2. |
Repair or replace ground connections. |
| 2 |
CLEAR THE SELF-LEARNING DATA
- With SDT
- Start engine and warm it up to normal operating temperature.
- Select "SELF-LEARNING CONT" in "Utility" mode with SDT.
- Clear the self-learning control coefficient by touching "Clear".
- Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
- Without SDT
- Start engine and warm it up to normal operating temperature.
- Turn ignition switch OFF.
- Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed.
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- 4. Stop engine and reconnect mass air flow sensor harness connector.
- 5. Check DTC P0102 is displayed.
- 6. Erase the DTC memory. Refer to
[EMISSION-RELATED DIAGNOSTIC INFORMATION
].
- 7. Check DTC P0000 is displayed.
- 8. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Yes or No |
Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to [P0171, P0174 Fuel Injection System Function]
or
[P0172, P0175 FUEL INJECTION SYSTEM FUNCTION ]. |
GO TO 3. |
| 3 |
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect heated oxygen sensor 2 harness connector.
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- 3. Disconnect ECM harness connector.
- 4. Check harness continuity between HO2S2 terminal 4 and ECM terminal 78.
Refer to WIRING DIAGRAM
.
Continuity should exist.
- 5. Also check harness for short to ground and short to power.
OK or NG |
GO TO 4. |
Repair open circuit or short to ground or short to power in harness or connectors. |
| 4 |
CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to WIRING DIAGRAM
.
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Continuity should exist.
- 2. Check harness continuity between the following terminals and ground. Refer to WIRING DIAGRAM
.
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Continuity should not exist.
- 3. Also check harness for short to power.
OK or NG |
GO TO 5. |
Repair open circuit or short to ground or short to power in harness or connectors. |
| 5 |
CHECK HEATED OXYGEN SENSOR 2
Refer to
[P0139, P0159 HO2S2 ].
OK or NG |
GO TO 6. |
Replace malfunctioning heated oxygen sensor 2. |
| 6 |
CHECK INTERMITTENT INCIDENT
Refer to
[SERVICE INFORMATION FOR ELECTRICAL INCIDENT: INTERMITTENT INCIDENT
] |
INSPECTION END |
|