DTC P2127 (Flash Code 122) Pedal Position Sensor 2 Circuit Low Input (RZ4E-TC)

1. Engine control system check

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Diagnostic system check-engine controls".

2. Prioritized DTC check

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 P0651 set at the same time?

Yes

Go to DTC P0651 diagnosis.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC P0651 (Flash Code 56) Sensor Reference Voltage 2 Circuit".

No

=>Go to Accelerator pedal position sensor 2 signal voltage check.

3. Accelerator pedal position sensor 2 signal voltage check

1) Fully depress and release the accelerator pedal while observing the Accelerator Pedal Position (APP) Sensor 2 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 2, 5 V reference voltage check.

No

Go to Intermittent conditions of engine.

Refer to "202.Engine 15D.Symptom(RZ4E-TC) intermittent conditions of engine".

4. Accelerator pedal position sensor 2, 5 V reference voltage check

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 1 of C67) of accelerator pedal position sensor 2 and the body ground with a DMM. Is the voltage more than or equal to the specified value?

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.).

Value: 4.5 V

Yes

=>Go to Accelerator pedal position sensor 2 signal voltage check using fused jumper wire.

No

=>Go to Inspection for open circuit in 5 V reference circuit of accelerator pedal position sensor 2.

5. Accelerator pedal position sensor 2 signal voltage check using fused jumper wire

1) Connect a fused jumper wire between the 5 V reference circuit and the signal circuit of accelerator pedal position sensor 2 (pins 1 and 3 of C67).

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.).

2) Observe the Accelerator Pedal Position (APP) Sensor 2 parameter on the scan tool. Is the Accelerator Pedal Position (APP) Sensor 2 parameter more than or equal to the specified value?

Value: 4.5 V

Yes

=>Go to Accelerator pedal position sensor harness connector inspection.

No

=>Go to Inspection for open circuit and short circuit in accelerator pedal position sensor 2 signal circuit.

6. Inspection for open circuit in 5 V reference circuit of accelerator pedal position sensor 2

1) Inspect the 5 V reference circuit between the ECM (pin 61 of C7) and accelerator pedal position sensor 2 (pin 1 of C67) for an open circuit or 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.).

Yes

=>Go to ECM harness connector inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

7. Inspection for open circuit and short circuit in accelerator pedal position sensor 2 signal circuit

1) Inspect the signal circuit between the ECM (pin 64 of C7) and accelerator pedal position sensor 2 (pin 3 of C67) for the following. 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

=>Go to ECM harness connector inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

8. Accelerator pedal position sensor harness connector inspection

1) Inspect for poor connections at the accelerator pedal position sensor harness connector (pins 1 and 3 of C67). Is the connection status 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 Repair verification.

No

Repair the connections as necessary.

=>Go to Repair verification.

9. ECM harness connector inspection

1) Inspect for poor connections at the ECM harness connector (pins 61 and 64 of C7). Is the connection status 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

=>Go to ECM replacement.

No

Repair the connections as necessary.

=>Go to Repair verification.

10. ECM replacement

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

=>Go to Repair verification.

11. Repair verification

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 Accelerator Pedal Position (APP) Sensor 2 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 2 signal voltage check.

No

Observe the DTC information with a scan tool.