Note
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without 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 P0122 or P0123 set at the same time?
Yes
Go to the applicable DTC diagnosis.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0122 Throttle Position Sensor Circuit Low".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0123 Throttle Position Sensor Circuit High".
No
=>Go to Intake throttle valve operation check.
1) Perform the Intake Throttle with a scan tool.
2) While observing the Desired Intake Throttle Valve Position parameter and Intake Throttle Position parameter on the scan tool, command the intake throttle valve OPEN/CLOSE. Is the difference between the Desired Intake Throttle Valve Position parameter and the Intake Throttle Position parameter within the specified range?
Note
Value: -5 to 5 %
Yes
Go to Intermittent conditions of engine.
Refer to "202.Engine 15D.Symptom(4JJ3 without DPD) intermittent conditions of engine".
No
=>Go to Intake throttle valve inspection.
1) Remove the intake air duct from the intake throttle valve.
2) Inspect the intake throttle valve for the following. Is the result normal?
Note
Yes
=>Go to Intake throttle valve circuit inspection.
No
Repair or replace as necessary.
=>Go to Intake throttle valve operation signal input inspection.
1) Inspect for poor connections at the intake throttle valve harness connector (pins 2, 3, 4, 5, and 6 of E25). Is the connection status normal?
2) Inspect for poor connections at the ECM harness connector (pins 1, 2, and 25 of E2, and pins18 and 29 of E3). Is the connection status normal?
3) Inspect the circuit between the ECM (pins 1, 2, and 25 of E2, and pins 18 and 29 of E3) and the intake throttle valve (pins 2, 3, 4, 5, and 6 of E25) for high resistance. Is the result normal?
Refer to "LHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
4) Are all of the results normal?
Yes
=>Go to Inspection for open circuit and short circuit in intake throttle motor circuit.
No
Repair the circuit or connection as necessary.
=>Go to Intake throttle valve operation signal input inspection.
1) Inspect the motor circuit between the ECM (pins 1 and 2 of E2) and the intake throttle valve (pins 5 and 6 of E25) for the following. Is the result normal?
Refer to "LHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Engine Control (4JJ3 without DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
Replace the intake throttle valve.
Refer to "1.Engine 1B.Mechanical(4JJ3 without DPD) Intake throttle valve removal".
Refer to "1.Engine 1B.Mechanical(4JJ3 without DPD) Intake throttle valve installation".
No
Repair the circuit as necessary.
=>Go to Intake throttle valve operation signal input inspection.
1) Reconnect all of the disconnected harness connectors.
2) Clear the DTC with a scan tool.
3) Turn OFF the ignition switch for 1 minute 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
No
Note
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM removal".
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without DPD) ECM installation".
Refer to "1.Engine 1Z.Engine Electrical Control(4JJ3 without 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.