Nissan Murano: Dtc/circuit Diagnosis / P2118 Throttle Control Motor

Nissan Murano (Z52) 2015-2024 Service Manual / Engine / Engine Control System :: Vq35de / Dtc/circuit Diagnosis / P2118 Throttle Control Motor

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content) 		DTC detection condition
P2118

ETC MOT-B1

(Throttle actuator control motor current range/performance) 		Diagnosis condition Start engine and let it idle
Signal (terminal) Throttle control motor circuit
Threshold ECM detects short in both circuits between ECM and throttle control motor
Diagnosis delay time —

POSSIBLE CAUSE

  • Harness or connectors

    (Throttle control motor circuit is shorted.)

  • Electric throttle control actuator

    (Throttle control motor)

FAIL-SAFE

Engine operating condition in fail-safe mode
Fail safe mode Nissan Murano Vehicle behavior
Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
DTC Confirmation Procedure

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

  1. Turn ignition switch OFF and wait at least 10 seconds.

  2. Turn ignition switch ON.

  3. Turn ignition switch OFF and wait at least 10 seconds.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

  1. Turn ignition switch ON and wait at least 2 seconds.

  2. Start engine and let it idle for 5 seconds.

  3. Check DTC.

Is DTC detected?

YES>>

Proceed to Diagnosis Procedure.

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

  1. Disconnect electric throttle control actuator harness connector.

  2. Disconnect ECM harness connector.

  3. Check the continuity between electric throttle control actuator harness connector and ECM harness connector.

    Electric throttle control actuator ECM Continuity
    Connector Terminal Connector Terminal
    F50 1 F78 1 Not existed
    3 Existed
    2 1 Existed
    3 Not existed

  4. Also check harness for short to ground and short to power.

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace malfunctioning part.

CHECK THROTTLE CONTROL MOTOR

Check throttle control motor. Refer to Component Inspection.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace electric throttle control actuator. Refer to Removal and Installation.

Component Inspection

CHECK THROTTLE CONTROL MOTOR

  1. Turn ignition switch OFF.

  2. Disconnect electric throttle control actuator harness connector.

  3. Check resistance between electric throttle control actuator terminals as per the following.

    Terminals Resistance
    1 and 2 Approx. 1 - 15 Ω [at 25°C (77°F)]

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace electric throttle control actuator. Refer to Removal and Installation.

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