QG18DE Engine

QG18DE Engine (Use Kit P/N 23731-4M528)

2000-02 MY Sentra (B15)

IMPORTANT
^ THE SENSORS IN THIS KIT ARE DIFFERENT. IT IS CRITICAL THAT EACH SENSOR BE INSTALLED IN THE CORRECT LOCATION. REFER TO "FIGURE A" AND THE ILLUSTRATIONS IN THIS REPAIR SECTION FOR SENSOR LOCATIONS.

^ Each new sensor (within each kit) is contained in a bag. The bag is labeled with the Nissan part number. Keep the sensor in the bag until just before it is installed. The supplier part number is on the face of the sensor. This number starts with "A29-".





^ The Crankshaft and Camshaft Position Sensors in Sensor Kit P/N 23731-4M528 look the same. To help you tell the difference between these sensors, a white paint mark was added to the Crankshaft sensor (see illustration above).

^ The old and new sensors may appear identical, therefore KEEP THEM SEPARATE.

Camshaft Position Sensor and Variable Timing Control Sensor Replacement

1. Record all radio station presets.

2. Disconnect the negative battery cable.





3. Locate the Camshaft Position Sensor and the Variable Timing Control Sensor (see Figure 1).

4. Disconnect the vehicle wire harness connectors from the sensors.

NOTE:
If the connector will not release for you, see Figure B (if applicable).

5. Remove and save the bolts that hold the sensors in place.

Camshaft Position Sensor (P/N 27731-4M560/A29-630-BJ0)

6. Remove the Camshaft Position Sensor with a pulling and twisting motion. Then, using a pair of pliers, break the connector on the OLD sensor so it cannot be reused.

7. Clean the hole that the old sensor was removed from.

8. Open the kit bag, remove the NEW sensor and apply a thin coat of clean engine oil to the 0-ring on the new sensor.

9. Insert (until fully seated) the NEW sensor into the hole with a pushing and twisting motion, being careful not to damage the 0-ring.

10. Re-install and tighten the sensor mounting bolt to 64 - 97 in-lb (7.2 - 11.0 N-m, 0.73 - 1.1 kg-m).

11. Re-connect the vehicle wire harness connector to the sensor.

Variable Timing Control Sensor (P/N 23731-6J965/A29-640-CJ1)

12. Remove the Variable Timing Control Sensor with a pulling and twisting motion. Then, using a pair of pliers, break the connector on the OLD sensor so it cannot be reused.

13. Clean the hole that the old sensor was removed from.

14. Open the kit bag, remove the NEW sensor and apply a thin coat of clean engine oil to the 0-ring on the new sensor.

15. Insert (until fully seated) the NEW sensor into the hole with a pushing and twisting motion, being careful not to damage the 0-ring.

16. Re-install and tighten the sensor mounting bolt to 64 - 97 in-lb (7.2 - 11.0 N-m, 0.73 - 1.1 kg-m).

17. Re-connect the vehicle wire harness connector to the sensor.

Crankshaft Position Sensor* Replacement (P/N 23731-4M565/A29-630-BJ1)





* This sensor has a white paint mark on it (see Figure 2).

1. Raise the vehicle on a hoist.

2. Locate the Crankshaft Position Sensor (see Figure 2).

3. Disconnect the vehicle wire harness connector from the sensor.

NOTE:
If the connector will not release for you, see Figure B (if applicable).

4. Remove and save the bolt that holds the sensor in place.

5. Remove the Crankshaft Position Sensor with a pulling and twisting motion. Then, using a pair of pliers, break the connector on the OLD sensor so it cannot be reused.

6. Clean the hole that the old sensor was removed from.

7. Open the kit bag, remove the NEW sensor and apply a thin coat of clean engine oil to the 0-ring on the new sensor.

8. Insert (until fully seated) the NEW sensor into the hole with a pushing and twisting motion, being careful not to damage the 0-ring.

9. Re-install and tighten the sensor mounting bolt to 64 - 97 in-lb (7.2 - 11.0 N-m, 0.73 - 1.1 kg-m).

10. Re-connect the vehicle wire harness connector to the sensor.

11. Lower the vehicle to the ground.

12. Reconnect the battery cable and reset the radio station presets and clock.

2003 MY Sentra (B15)

IMPORTANT
^ THE SENSORS IN THIS KIT ARE DIFFERENT. IT IS CRITICAL THAT EACH SENSOR BE INSTALLED IN THE CORRECT LOCATION. REFER TO "FIGURE A" AND THE ILLUSTRATIONS IN THIS REPAIR SECTION FOR SENSOR LOCATIONS.

^ Each new sensor (within each kit) is contained in a bag. The bag is labeled with the Nissan part number. Keep the sensor in the bag until just before it is installed. The supplier part number is on the face of the sensor. This number starts with "A29-".

^ The Crankshaft and Camshaft Position Sensors in Sensor Kit P/N 23731-4M528 look the same. To help you tell the difference between these sensors, a white paint mark was added to the Crankshaft sensor (see the illustration at the begining of the first procedure).

^ The old and new sensors may appear identical, therefore KEEP THEM SEPARATE.

^ The Variable Timing Control Sensor (P/N 23731-6J965/A29-640-CJ1) is NOT used on the 2003 MY Sentra.

Camshaft Position Sensor Replacement (P/N 23731-4M560/A29-630-BJ0)

1. Record all radio station presets.

2. Disconnect the negative battery cable.





3. Locate the Camshaft Position Sensor (see Figure 3).

4. Disconnect the vehicle wire harness connector from the sensor.

NOTE:
If the connector will not release for you, see Figure B (if applicable).

5. Remove and save the bolt that holds the sensor in place.

6. Remove the Camshaft Position Sensor with a pulling and twisting motion. Then, using a pair of pliers, break the connector on the OLD sensor so it cannot be reused.

7. Clean the hole that the old sensor was removed from.

8. Open the kit bag, remove the NEW sensor and apply a thin coat of clean engine oil to the 0-ring on the new sensor.

9. Insert (until fully seated) the NEW sensor into the hole with a pushing and twisting motion, being careful not to damage the 0-ring.

10. Re-install and tighten the sensor mounting bolt to 64 - 97 in-lb (7.2 - 11.0 N-m, 0.73 - 1.1 kg-m).

11. Re-connect the vehicle wire harness connector to the sensor.

Crankshaft Position Sensor* Replacement (P/N 23731-4M565/A29-630-BJ1)





* This sensor has a white paint mark on it (see Figure 4).

1. Raise the vehicle on a hoist.

2. Locate the Crankshaft Position Sensor (see Figure 4).

3. Disconnect the vehicle wire harness connector from the sensor.

NOTE:
If the connector will not release for you, see Figure B (if applicable).

4. Remove and save the bolt that holds the sensor in place.

5. Remove the Crankshaft Position Sensor with a pulling and twisting motion. Then, using a pair of pliers, break the connector on the OLD sensor so it cannot be reused.

6. Clean the hole that the old sensor was removed from.

7. Open the kit bag, remove the NEW sensor and apply a thin coat of clean engine oil to the 0-ring on the new sensor.

8. Insert (until fully seated) the NEW sensor into the hole with a pushing and twisting motion, being careful not to damage the 0-ring.

9. Re-install and tighten the sensor mounting bolt to 64 - 97 in-lb (7.2 - 11.0 N-m, 0.73 - 1.1 kg-m).

10. Re-connect the vehicle wire harness connector to the sensor.

11. Lower the vehicle to the ground.

12. Reconnect the battery cable and reset the radio station presets and clock.