DTC P0473 EGR Gas Pressure Sensor Circuit High (4JJ3 with DPD)

1. Engine control system check

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

2. Current DTC check

1) Connect the 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. Is a DTC set?

Yes

=>Go to Prioritized DTC check.

Go to Intermittent conditions of engine.

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

3. Prioritized DTC check

1) Observe the DTC information with a scan tool. Is DTC P06A3 set at the same time?

Yes

Go to DTC P06A3 diagnosis.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P06A3 Sensor Reference Voltage 4 Circuit".

=>Go to EGR gas pressure sensor signal voltage check.

4. EGR gas pressure sensor signal voltage check

1) Turn OFF the ignition switch.

2) Disconnect the EGR gas pressure sensor harness connector (E102).

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 DTC information with a scan tool. Is DTC P0472 set?

Yes

=>Go to EGR gas pressure sensor ground circuit inspection using test lamp.

=>Go to Inspection for short to power supply in EGR gas pressure sensor signal circuit.

5. EGR gas pressure sensor ground circuit inspection using test lamp

1) Connect a test lamp between the EGR gas pressure sensor ground circuit (pin 1 of E102) and the battery power supply. Does the test lamp illuminate?

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 EGR gas pressure sensor harness connector inspection.

=>Go to Inspection for open circuit in EGR gas pressure sensor ground circuit.

6. Inspection for short to power supply in EGR gas pressure sensor signal circuit

1) Inspect the EGR gas pressure sensor signal circuit between the ECM (pin 23 of E1) and the EGR gas pressure sensor (pin 2 of E102) for the following. Is the result normal?

Short to the battery power supply circuit or short to the ignition power supply circuit
Short to the 5 V power supply circuit

Note

The EGR gas pressure sensor may be damaged if the sensor signal circuit is shorted to the power supply.

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.

Repair the circuit as necessary.

=>Go to Repair verification.

7. Inspection for open circuit in EGR gas pressure sensor ground circuit

1) Inspect the ground circuit between the ECM (pin 19 of E3) and the EGR gas pressure sensor (pin 1 of E102) for an open circuit or high resistance. Is the result normal?

Caution

The EGR gas pressure sensor shares the ground circuit with other sensors. A malfunction in the ground circuit may set DTCs on sensors that share this circuit.

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.

Repair the circuit as necessary.

=>Go to Repair verification.

8. EGR gas pressure sensor harness connector inspection

1) Inspect for poor connections at the EGR gas pressure sensor harness connector (pin 1 of E102). 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

Replace the EGR gas pressure sensor.

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) EGR gas pressure sensor removal".

Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) EGR gas pressure sensor installation".

=>Go to Repair verification.

Repair the connections as necessary.

=>Go to Repair verification.

9. ECM harness connector inspection

1) Inspect for poor connections at the ECM harness connector (pin 19 of E3). 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.

Repair the connections as necessary.

=>Go to Repair verification.

10. ECM replacement

Note

Perform programming after replacing the ECM.

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.

11. 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.