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 set at the same time?
Yes
Go to DTC P0641 diagnosis.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) DTC P0641 Sensor Reference Voltage 1 Circuit".
No
=>Go to Accelerator pedal position sensor 1 signal voltage check.
1) Fully depress and release the accelerator pedal while observing the Accelerator Pedal Position (APP) Sensor 1 parameter on the scan tool. Does the scan tool display a value less than or equal to the specified value while the pedal is being depressed and released?
Value: 0.4 V
Yes
=>Go to 5 V reference voltage check for accelerator pedal position sensor 1.
No
Go to Intermittent conditions of engine.
Refer to "202.Engine 15D.Symptom(4JJ3 without DPD) intermittent conditions of engine".
1) Turn OFF the ignition switch.
2) Disconnect the accelerator pedal position sensor harness connector (C67).
3) Turn ON the ignition switch.
4) Measure the voltage between the 5 V reference circuit (pin 4 of C67) of accelerator pedal position sensor 1 and the body ground with a DMM. Is the voltage more than or equal to the specified value?
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.).
Value: 4.5 V
Yes
=>Go to Accelerator pedal position sensor 1 signal voltage check using fused jumper wire.
No
=>Go to Inspection for open circuit in 5 V reference circuit of accelerator pedal position sensor 1.
1) Connect a fused jumper wire between the 5 V reference circuit and the signal circuit of accelerator pedal position sensor 1 (pins 4 and 6 of C67).
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.).
2) Observe the Accelerator Pedal Position (APP) Sensor 1 parameter on the scan tool. Is the Accelerator Pedal Position (APP) Sensor 1 parameter more than or equal to the specified value?
Value: 4.5 V
Yes
=>Go to Accelerator pedal position sensor harness connector inspection.
No
1) Inspect the 5 V reference circuit between the ECM (pin 30 of C8) and accelerator pedal position sensor 1 (pin 4 of C67) for an open circuit or 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.).
Yes
=>Go to ECM harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect the signal circuit between the ECM (pin 27 of C10) and accelerator pedal position sensor 1 (pin 6 of C67) 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
=>Go to ECM harness connector inspection.
No
Repair the circuit as necessary.
1) Inspect for poor connections at the accelerator pedal position sensor harness connector (pins 4 and 6 of C67). Is the connection status 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".
No
Repair the connections as necessary.
1) Inspect for poor connections at the ECM harness connector (pin 30 of C8, and pin 27 of C10). Is the connection status 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
No
Repair the connections as necessary.
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 Accelerator Pedal Position (APP) Sensor 1 parameter on the scan tool. Does the scan tool display a value less than or equal to the specified value while the pedal is being depressed and released?
Value: 0.4 V
Yes
=>Go to Accelerator pedal position sensor 1 signal voltage check.
No
Observe the DTC information with a scan tool.