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 P0641, P0651, P2122, P2123, P2127, or P2128 set at the same time?
Yes
Go to the applicable DTC diagnosis.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0641 Sensor Reference Voltage 1 Circuit".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0651 Sensor Reference Voltage 2 Circuit".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P2122 Pedal Position Sensor 1 Circuit Low Input".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P2123 Pedal Position Sensor 1 Circuit High Input".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P2127 Pedal Position Sensor 2 Circuit Low Input".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P2128 Pedal Position Sensor 2 Circuit High Input".
No
1) Fully depress and release the accelerator pedal while observing the DTC information with a scan tool. Is a DTC set?
Yes
=>Go to Accelerator pedal position sensor circuit inspection.
No
Go to Intermittent conditions of engine.
Refer to "202.Engine 15D.Symptom(4JJ3 without DPD) intermittent conditions of engine".
1) Inspect for poor connections at the accelerator pedal position sensor harness connector (pins 1, 2, 3, 4, 5, and 6 of C67). Is the connection status normal?
2) Inspect for poor connections at the ECM harness connector (pins 24, 25, 30, 31 of C8, and pins 22 and 27 of C10). Is the connection status normal?
3) Inspect the circuit between the ECM (pins 24, 25, 30, and 31 of C8, and pins 22 and 27 of C10) and the accelerator pedal position sensor (pins 1, 2, 3, 4, 5, and 6 of C67) 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 short circuit in accelerator pedal position sensor signal circuit.
No
Repair the circuit or connection as necessary.
1) Inspect the signal circuit between the ECM (pins 22 and 27 of C10) and the accelerator pedal position sensor (pins 3 and 6 of C67) for a short together. 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 accelerator pedal.
Refer to "1.Engine 1I.Speed Control Systems(4JJ3 without DPD) accelerator pedal removal".
Refer to "1.Engine 1I.Speed Control Systems(4JJ3 without DPD) accelerator pedal installation".
=>Go to Accelerator pedal position sensor signal input check.
No
Repair the circuit as necessary.
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) Fully depress and release the accelerator pedal while observing 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) Fully depress and release the accelerator pedal while observing the DTC information with a scan tool.
5) Observe the DTC information with a scan tool.