Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Diagnostic system check-engine controls".
1) Connect the scan tool.
2) Turn OFF the ignition switch for 30 seconds 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(RZ4E-TC) DTC P0641 (Flash Code 55) Sensor Reference Voltage 1 Circuit".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0651 (Flash Code 56) Sensor Reference Voltage 2 Circuit".
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(RZ4E-TC) 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 41, 42, 60, 61, 63, and 64 of C7). Is the connection status normal?
3) Inspect the circuit between the ECM (pins 41, 42, 60, 61, 63, and 64 of C7) 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 "RHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Engine Control (RZ4E)" 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 for a short together in the signal circuit between the ECM (pins 63 and 64 of C7) and the accelerator pedal position sensor (pins 3 and 6 of C67). Is the result normal?
Refer to "RHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "LHD Engine Control (RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
Replace the accelerator pedal.
Refer to "1.Engine 1I.Speed Control Systems(RZ4E-TC) accelerator pedal removal".
Refer to "1.Engine 1I.Speed Control Systems(RZ4E-TC) 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 30 seconds 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(RZ4E-TC) ECM removal".
Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM installation".
Refer to "1.Engine 1Z.Engine Electrical Control(RZ4E-TC) ECM setting".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch for 30 seconds 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.