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) Start the engine.
4) Observe the DTC information with a scan tool. Is DTC P0241, P0242, P0472, or P0473 set at the same time?
Yes
Go to the applicable DTC diagnosis.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0241 Turbocharger Boost Sensor Circuit Low".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0242 Turbocharger Boost Sensor Circuit High".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0472 EGR Gas Pressure Sensor Circuit Low".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0473 EGR Gas Pressure Sensor Circuit High".
No
=>Go to Barometric pressure check.
1) Refer to the table and compare the Barometric Pressure (BARO) parameter on the scan tool with the surrounding barometric pressure. Is the Barometric Pressure (BARO) parameter within the specified range?
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 with DPD) ECM inspection".
Yes
=>Go to Inspection of each harness connector related to EGR gas pressure sensor circuit.
No
1) Inspect for poor connections at the EGR gas pressure sensor harness connector (pins 1, 2, and 3 of E102). Is the connection status normal?
2) Inspect for poor connections at the ECM harness connector (pin 23 of E1, and pins 19 and 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.).
3) Are all of the results normal?
Yes
=>Go to Inspection for high resistance in EGR gas pressure sensor circuit.
No
Repair the connections as necessary.
1) Inspect the circuit between the ECM (pin 23 of E1, and pins 19 and 28 of E3) and the EGR gas pressure sensor (pins 1, 2, and 3 of E102) for high resistance. 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
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 circuit 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.