Diagnostic Procedure For In-Vehicle Sensor

SYMPTOM: In-vehicle sensor circuit is open or shorted. (22 or -22 is indicated on auto amp. as a result of conducting Self-diagnosis STEP-2)

Fig 1: Identifying In-Vehicle Sensor

Courtesy of NISSAN MOTOR CO., U.S.A.

1. CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND 
   1. Disconnect in-vehicle sensor connector.
   2. Turn ignition switch ON.
   3. Check voltage between in-vehicle sensor harness connector M68 terminal 2 (LG/B) and ground.

   2-ground: Approx. 5V

   Fig 2: Checking In-Vehicle Sensor-To-Ground Voltage

   Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   1. OK: GO TO 2.
   2. OK: GO TO  4.

2. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND AUTO AMP. 
   1. Turn ignition switch OFF.
   2. Disconnect auto amp. connector.
   3. Check continuity between in-vehicle sensor harness connector M68 terminal 1 (R/Y) and auto amp. harness connector M119 terminal 11 (R/Y).
      Fig 3: Checking In-Vehicle Sensor-To-Auto Amp. Continuity

      Courtesy of NISSAN MOTOR CO., U.S.A.

   1-11: continuity should exist.

   OK or NG 

   1. OK: GO TO 3
   2. NG: Repair harness or connector

3. CHECK IN-VEHICLE SENSOR 

   Refer to IN-VEHICLE SENSOR 

   OK or NG 

   1. OK:
      1. Replace auto amp.
      2. Go to self-diagnosisFUNCTION CONFIRMATION PROCEDURE  and perform self-diagnosis STEP-2. Confirm that code no. 20 is displayed.
   2. NG:
      1. Replace in vehicle sensor.
      2. Go to self-diagnosis FUNCTION CONFIRMATION PROCEDURE  and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.

4. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND AUTO AMP. 
   1. Turn ignition switch OFF.
   2. Disconnect auto amp. connector.
   3. Check continuity between in-vehicle sensor harness connector M68 terminal 2 (LG/B) and auto amp. harness connector M119 terminal 3 (LG/B).
      Fig 4: Checking In-Vehicle Sensor-To-Auto Amp. Continuity

      Courtesy of NISSAN MOTOR CO., U.S.A.

      2-3: Continuity should exist. 

   4. Check continuity between auto amp. harness connector M119 terminal 3 (LG/B) and ground.

      3- Ground: Continuity should not exist. 

   OK or NG 

   1. OK:
      1. Replace auto amp.
      2. Go to self-diagnosis FUNCTION CONFIRMATION PROCEDURE  and perform self-diagnosis STEP-2. Confirm that code No. 20 is displayed.
   2. NG: Repair harness or connector.