DTC P042C Exhaust Gas Temperature (EGT) Sensor 2 Circuit Low (4JJ3 with DPD)

1. Engine control system check

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Diagnostic system check-engine controls".

2. Prioritized DTC check

1) Connect the scan tool.

2) Turn OFF the ignition switch for 1 minute or more.

3) Start the engine.

4) Observe the DTC information with a scan tool. Is DTC P0651 set at the same time?

Yes

Go to DTC P0651 diagnosis.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0651 Sensor Reference Voltage 2 Circuit".

No

=>Go to Exhaust gas temperature sensor 2 (front of oxidation catalyst) signal voltage check.

3. Exhaust gas temperature sensor 2 (front of oxidation catalyst) signal voltage check

1) Observe the Exhaust Gas Temperature (EGT) Sensor 2 parameter on the scan tool. Is the Exhaust Gas Temperature (EGT) Sensor 2 parameter less than or equal to the specified value?

Value: 0.1 V

Yes

=>Go to Exhaust gas temperature sensor 2 (front of oxidation catalyst) signal output voltage check.

No

Go to Intermittent conditions of engine.

Refer to "202.Engine 15D.Symptom(4JJ3 with DPD) intermittent conditions of engine".

4. Exhaust gas temperature sensor 2 (front of oxidation catalyst) signal output voltage check

1) Turn OFF the ignition switch.

2) Disconnect the Exhaust gas temperature sensor 2 (front of oxidation catalyst) harness connector (E80).

Refer to "RHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Observe the Exhaust Gas Temperature (EGT) Sensor 2 parameter on the scan tool. Is the Exhaust Gas Temperature (EGT) Sensor 2 parameter more than or equal to the specified value?

Value: 4.5 V

Yes

Replace Exhaust gas temperature sensor 2 (front of oxidation catalyst).

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) exhaust gas temperature sensor 2 (Front of oxidation catalyst) removal".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) exhaust gas temperature sensor 2 (Front of oxidation catalyst) installation".

=>Go to Repair verification.

No

=>Go to Inspection for short to ground in Exhaust gas temperature sensor 2 (front of oxidation catalyst) signal circuit.

5. Inspection for short to ground in Exhaust gas temperature sensor 2 (front of oxidation catalyst) signal circuit

1) Inspect the signal circuit between the ECM (pin 30 of E1) and Exhaust gas temperature sensor 2 (front of oxidation catalyst) (pin 1 of E80) for the following. Is the result normal?

Refer to "RHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to ECM harness connector inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

6. ECM harness connector inspection

1) Inspect for poor connections at the ECM harness connector (pin 30 of E1, and pin 27 of E2). Is the connection status normal?

Refer to "RHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to ECM replacement.

No

Repair the connections as necessary.

=>Go to Repair verification.

7. ECM replacement

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM removal".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM installation".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM setting".

Procedure completion

=>Go to Repair verification.

8. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 1 minute or more.

3) Start the engine.

4) Operate the vehicle under the conditions for running the DTC.

5) Observe the DTC information with a scan tool.