Nissan Murano: Dtc/circuit Diagnosis / P0794 Intermediate Speed Sensor a

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connector (Primary speed sensor circuit is open or shorted)

• Primary speed sensor

• TCM

FAIL-SAFE

• Start is slow

• Acceleration is slow

• Lock-up is not performed

• Manual mode is not activated

DTC CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” is previously conducted, always turn ignition switch OFF and wait at least 10 seconds before performing the next test.

GO TO 2.

CHECK DTC DETECTION

1. Start the engine.

2. Shift the selector lever to D position.

3. Fully depress the acceleraor pedal and accelerate by reaching 100 km/h (62MPH).

   And then release the accelrator pedal.

   CAUTION:

   Always drive at a safe speed.

4. Stop the Nissan Murano vehicle.

5. Check the first trip DTC.

Is “P0794” detected?

Go to Diagnosis Procedure.

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

Confirmation after repair: INSPECTION END

CHECK PRIMARY SPEED SENSOR POWER CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect primary speed sensor connector.

3. Turn ignition switch ON.

4. Check voltage between primary speed sensor harness connector terminal and ground.

   +		−	Voltage
   Primary speed sensor
   Connector	Terminal
   F35	3	Ground	10 – 16 V

Is the inspection result normal?

GO TO 2.

GO TO 6.

CHECK PRIMARY SPEED SENSOR GROUND CIRCUIT

Check continuity between primary speed sensor harness connector terminal and ground.

Is the inspection result normal?

GO TO 3.

Repair or replace malfunctioning parts.

CHECK CIRCUIT BETWEEN PRIMARY SPEED SENSOR AND TCM (PART 1)

1. Turn ignition switch OFF.

2. Disconnect TCM connector.

3. Check continuity between primary speed sensor harness connector terminal and TCM harness connector terminal.

   Primary speed sensor		TCM		Continuity
   Connector	Terminal	Connector	Terminal
   F35	2	F25	35	Existed

Is the inspection result normal?

GO TO 4.

Repair or replace malfunctioning parts.

CHECK CIRCUIT BETWEEN PRIMARY SPEED SENSOR AND TCM (PART 2)

Check continuity between primary speed sensor harness connector terminal and ground.

Is the inspection result normal?

GO TO 5.

Repair or replace malfunctioning parts.

CHECK TCM INPUT SIGNALS

1. Connect all of disconnected connectors.

2. Lift the Nissan Murano vehicle.

3. Start the engine.

4. Check frequency of primary speed sensor.

   +		−	Condition	Frequency (Approx.)
   TCM
   Connector	Terminal
   F25	35	Ground	Selector lever: “M1” position Nissan Murano Vehicle speed: 20 km/h (12 MPH)	600 Hz

Is the inspection result normal?

Check intermittent incident. Refer to Intermittent Incident.

Replace primary speed sensor. Refer to Removal and Installation.

DETECT MALFUNCTIONING ITEMS

Check the following items:

• Harness open circuit or short circuit between ignition switch and IPDM E/R. Refer to Wiring Diagram - IGNITION POWER SUPPLY -.

• Harness open circuit or short circuit between IPDM E/R connector terminal 61 and primary speed sensor connector terminal 3.

• 10A fuse (No.43, located in the IPDM E/R). Refer to IPDM E/R Terminal Arrangement .

• IPDM E/R

Is the check result normal?

Check intermittent incident. Refer to Intermittent Incident.

Repair or replace malfunctioning parts.