DTC P042E (Flash Code 45) Exhaust Gas Recirculation (EGR) Closed Position Performance (RZ4E-TC)

1. Engine control system check

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Diagnostic system check-engine controls".

2. Inspection of EGR valve circuit

1) Inspect for poor connections at the EGR valve harness connector (pins 1, 2, 3, 4, and 6 of E49). Is the connection status normal?

2) Inspect for poor connections at the ECM harness connector (pins 11, 14, 22, 28, and 30 of E4). Is the connection status normal?

3) Inspect the circuit between the ECM (pins 11, 14, 22, 28, and 30 of E4) and the EGR valve (pins 1, 2, 3, 4, and 6 of E49) for high resistance. Is the result normal?

Refer to "RHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

4) Are all of the results normal?

Yes

=>Go to Inspection for short circuit in EGR motor circuit.

No

Repair the circuit or connection as necessary.

=>Go to EGR valve operation signal input check.

3. Inspection for short circuit in EGR motor circuit

Refer to "RHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to EGR valve inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

4. EGR valve inspection

1) Remove the EGR valve from the engine.

Refer to "1.Engine 1H.Aux. Emission Control Devices(RZ4E-TC) EGR removal".

2) Inspect the EGR valve for the following. Is the result normal?

Yes

=>Go to EGR valve operation signal input check.

No

Repair as necessary.

=>Go to Repair verification.

5. EGR valve operation signal input check

1) Reconnect all of the disconnected harness connectors.

2) Clear the DTC with a scan tool.

3) Turn OFF the ignition switch for 30 seconds or more.

4) Start the engine.

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

6) Observe the DTC information with a scan tool. Is a DTC set?

Yes

Replace the EGR valve.

Refer to "1.Engine 1H.Aux. Emission Control Devices(RZ4E-TC) EGR removal".

Refer to "1.Engine 1H.Aux. Emission Control Devices(RZ4E-TC) EGR installation".

=>Go to Repair verification.

No

=>Go to Repair verification.

6. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 30 seconds 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.