DTC P0490 (Flash Code 44) EGR Valve DC Motor Short to Battery (RZ4E-TC)

1. Engine control system check

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

2. Current DTC check

1) Connect the scan tool.

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

3) Start the engine.

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

Yes

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

Go to Intermittent conditions of engine.

Refer to "202.Engine 15D.Symptom(RZ4E-TC) intermittent conditions of engine".

3. Inspection for open circuit and short circuit in EGR motor circuit

1) Inspect the motor circuit between the ECM (pins 22 and 30 of E4) and the EGR valve (pins 4 and 6 of E49) for the following. Is the result normal?

Open circuit
Short to ground
Short to the battery power supply circuit or short to the ignition power supply circuit
Short together between motor circuits
Short to position sensor 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 Individual harness connector inspection.

=>Go to ECM replacement.

4. Individual harness connector inspection

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

2) Inspect for poor connections at the ECM harness connector (pins 22 and 30 of E4). Is the connection status 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.).

3) Are all of the results normal?

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 EGR valve operation signal input check.

Repair the circuit 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

=>Go to ECM replacement.

=>Go to Repair verification.

6. ECM replacement

Note

Perform programming after replacing the ECM.

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM removal".

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM installation".

Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM setting".

Procedure completion

=>Go to Repair verification.

7. 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.