Diagnostic Procedure For Ambient Sensor

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: Ambient sensor circuit is open or shorted. (40 or 41 is indicated on front air control as a result of conducting the front air control self-diagnosis)

Fig 1: Diagnostic Procedure For Ambient Sensor

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

CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
1. Disconnect ambient sensor connector.
2. Turn ignition switch ON.
3. Check voltage between ambient sensor harness connector E1 terminal 1 (P) and ground.
  - 1 - Ground: Approx. 5V
OK or NG
- OK: GO TO 2.
- NG: GO TO 4.
Fig 2: Checking Voltage Between Ambient Sensor Harness Connector E1 Terminal 1 (P) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between ambient sensor harness connector E1 terminal 1 (P) and front air control harness connector M49 terminal 17 (P).
  - 1 - 17: Continuity should exist.
OK or NG
- OK: GO TO 3.
- NG: Repair harness or connector.
Fig 3: Checking Continuity Between Ambient Sensor Harness Connector E1 Terminal 1 And Front Air Control Harness Connector M49 Terminal 17
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK AMBIENT SENSOR
Refer to "AMBIENT SENSOR CIRCUIT ".

OK or NG
- OK:
  1. Replace front air control. Refer to "FRONT AIR CONTROL ".
  2. Go to self-diagnosis "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
- NG:
  1. Replace ambient sensor.
  2. Go to self-diagnosis "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between ambient sensor harness connector E1 terminal 2 (V/R) and front air control harness connector M49 terminal 21 (V/R).
  - 2 - 21: Continuity should exist.
4. Check continuity between ambient sensor harness connector E1 terminal 2 (V/R) and ground.
  - 2 - Ground: Continuity should not exist.
OK or NG
- OK:
  1. Replace front air control. Refer to "FRONT AIR CONTROL ".
  2. Go to self-diagnosis "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
- NG: Repair harness or connector.
Fig 4: Checking Continuity Between Ambient Sensor Harness Connector E1 Terminal 2 And Front Air Control Harness Connector M49 Terminal 21
Courtesy of NISSAN MOTOR CO., U.S.A.