Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Diagnostic system check-engine controls".
1) Connect the scan tool.
2) Turn OFF the ignition switch for 1 minute or more.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool. Is a DTC set?
Yes
=>Go to Prioritized DTC check.
No
Go to Intermittent conditions of engine.
Refer to "202.Engine 15D.Symptom(4JJ3 with DPD) intermittent conditions of engine".
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".
No
=>Go to EGR gas pressure sensor 5 V power supply voltage check.
1) Turn OFF the ignition switch.
2) Disconnect the EGR gas pressure sensor harness connector (E102).
3) Turn ON the ignition switch.
4) Measure the voltage between the EGR gas pressure sensor 5 V power supply circuit (pin 3 of E102) and the frame ground with a DMM. Is the voltage more than or equal to the specified value?
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.).
Value: 4.9 V
Yes
=>Go to EGR gas pressure sensor signal voltage check using fused jumper wire.
No
=>Go to Inspection for open circuit in EGR gas pressure sensor 5 V power supply circuit.
1) Connect a fused jumper wire between the EGR gas pressure sensor 5 V power supply circuit and the signal circuit (pins 2 and 3 of 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.).
2) Start the engine.
3) Operate the vehicle under the conditions for running DTC P0473.
4) Observe the DTC information with a scan tool. Is DTC P0473 set?
Yes
=>Go to EGR gas pressure sensor harness connector inspection.
No
=>Go to Inspection for open circuit and short circuit in EGR gas pressure sensor signal circuit.
1) Inspect the EGR gas pressure sensor 5 V power supply circuit between the ECM (pin 28 of E3) and the EGR gas pressure sensor (pin 3 of E102) for an open circuit or high resistance. Is the result normal?
Caution
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.
1) Turn OFF the ignition switch.
2) Disconnect the ECM harness connector (E1 and E3).
3) 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?
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.
No
Repair the circuit as necessary.
1) Inspect for poor connections at the EGR gas pressure sensor harness connector (pins 2 and 3 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".
No
Repair the connections as necessary.
1) Inspect for poor connections at the ECM harness connector (pin 23 of E1, and pin 28 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
No
Repair the connections as necessary.
Note
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
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.