Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC PRIORITY
1. Turn ignition switch ON.
2. Connect CONSULT and check for other existing "ENGINE" diagnostic trouble codes.
If DTC P06D3-00 is present, perform the confirmation procedure (diagnosis procedure) for this other DTC first.

Is applicable DTC detected?

YES

Perform diagnosis of applicable DTC. Refer to DTC Description .

NO

GO TO 2 .
CHECK FOR ACTIVE ACCELERATOR PEDAL POSITION SENSOR DTC
Check for DTC P2127-00 being active on the CONSULT screen.

Is applicable DTC active?

YES

GO TO 3 .

NO

Refer to Intermittent Incident .
INSPECT ACCELERATOR PEDAL POSITION SENSOR AND CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect the accelerator pedal position sensor from engine harness connector.
3. Inspect the accelerator pedal position sensor connector for the following:
  - Loose connector
  - Corroded pins
  - Bent or broken pins
  - Pushed back or expanded pins
  - Moisture in or on the connector
  - Missing or damaged connector seals
  - Dirt or debris on or in the connector pins
  - Connector shell broken
  - Wire insulation damage
  - Damaged connector locking tab.
Is the inspection result normal?

YES

GO TO 4 .

NO

Repair or replace error-detected parts.

CHECK ACCELERATOR PEDAL POSITION SENSOR POWER SUPPLY AND RETURN CIRCUITS

Turn ignition switch ON.

Check the voltage between accelerator pedal position sensor supply voltage and return circuit terminals.

Accelerator pedal position sensor

Voltage (V)

(Approx.)

Connector

Terminal (+)

Terminal (-)

E20

Is the inspection result normal?

YES

GO TO 5 .

GO TO 7 .

CHECK THE CIRCUIT RESPONSE
1. Turn ignition switch OFF.
2. Connect a jumper wire between accelerator pedal position sensor connector 5V supply terminal 1 and signal circuit terminal 6.
3. Turn key ON and wait 30 seconds.
4. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.
Did P2128-00 DTC become active and P2127-00 DTC become inactive?

YES

GO TO 6 .

NO

GO TO 7 .
CHECK THE DTC AND VERIFY ACCELERATOR PEDAL CONDITION
1. Turn ignition switch OFF.
2. Disconnect the jumper wire.
3. Reconnect the accelerator pedal position sensor connector.
4. Turn ignition switch ON.
5. Connect CONSULT and check for current ENGINE diagnostic trouble codes.
Did P2127-00 DTC become active?

YES

Replace the accelerator pedal position sensor. Refer to Removal and Installation .

NO

The removal and installation of the connector corrected the issue.
INSPECT ECM AND ENGINE HARNESS CONNECTOR PINS
1. Turn ignition switch OFF.
2. Disconnect ECM from engine harness connector.
3. Inspect the ECM connector for the following:
  - Loose connector
  - Corroded pins
  - Bent or broken pins
  - Pushed back or expanded pins
  - Moisture in or on the connector
  - Missing or damaged connector seals
  - Dirt or debris on or in the connector pins
  - Connector shell broken
  - Wire insulation damage
  - Damaged connector locking tab.
Is the inspection result normal?

YES

GO TO 8 .

NO

Repair or replace error-detected parts.

CHECK ACCELERATOR PEDAL POSITION SENSOR POWER SUPPLY CIRCUIT FOR OPEN

Check the power circuit for continuity between accelerator pedal position sensor harness connector and ECM harness connector.

Accelerator pedal position sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E20	1	E93	81	Yes

Is the inspection result normal?

YES

GO TO 9 .

Repair open power supply circuit in harness or connectors.

CHECK ACCELERATOR PEDAL POSITION SENSOR SIGNAL CIRCUIT FOR OPEN

Check the signal circuit for continuity between accelerator pedal position sensor harness connector and ECM harness connector.

Accelerator pedal position sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E20	6	E93	78	Yes

Is the inspection result normal?

YES

GO TO 10 .

Repair open signal circuit in harness or connectors.

CHECK FOR A PIN TO PIN SHORT IN SIGNAL CIRCUIT

Check for continuity between accelerator pedal position sensor signal circuit and all other circuits at ECM harness connector.

ECM			Continuity
Connector	Terminal	Terminal	Continuity
E93	78	All others	No

Is the inspection result normal?

YES

GO TO 11 .

Repair short signal circuit in harness connector.

CHECK ACCELERATOR PEDAL POSITION SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND

Check for continuity between accelerator pedal position sensor signal circuit and ground at ECM harness connector.

ECM		Ground	Continuity
Connector	Terminal
E93	78	-	No

Is the inspection result normal?

YES

GO TO 12 .

Repair accelerator pedal position sensor signal circuit for a short to ground.

CHECK FOR CURRENT VS PAST DTC
1. Connect all components in the correct positions.
2. Turn ignition switch ON.
3. Connect CONSULT and check for "past" "ENGINE" diagnostic trouble codes.
Is P2127-00 DTC inactive?

YES
- The removal and installation of the connector corrected the issue.
- GO TO 13.
NO
- Replace the ECM. Refer to Removal and Installation .
- GO TO 13.
ERASE DTC
1. Using CONSULT, erase all DTCs.
2. Operate the engine within the conditions for setting the DTC.
3. Using CONSULT, check for existing "ENGINE" diagnostic trouble codes.
Is P2127-00 DTC current?

YES

Troubleshooting procedure needs to be repeated. Go to DTC Description .

NO

Repair complete.