Diagnostic Procedure For In-Vehicle Sensor

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM: In-vehicle sensor circuit is out of range. (30 or 31 is indicated on front air control display as a result of conducting self-diagnosis.)

Fig 1: Inspecting In-Vehicle Sensor Circuit

CHECK IN-VEHICLE SENSOR CIRCUIT
Perform A/C system self-diagnosis. Refer to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION ".

Is self-diagnosis code 30 or 31 present?

YES: GO TO 2.

NO: GO TO 6.
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 M32 terminal 4 and ground.
  4 - Ground : Approx. 5V.
OK or NG

OK: GO TO 3.

NG: GO TO 5.

Fig 2: Checking Voltage Between In-Vehicle Sensor Harness Connector M32 Terminal 4 And Ground
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector M49.
3. Check continuity between in-vehicle sensor harness connector M32 terminal 1 and front air control harness connector M49 terminal 13.
  1 - 13 : Continuity should exist.
OK or NG

OK: GO TO 4.

NG: Repair harness or connector.

Fig 3: Checking Continuity Between In-Vehicle Sensor Harness Connector M32 Terminal 1 And Connector M49 Terminal 13
CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. Refer to "IN-VEHICLE SENSOR ".

OK or NG

OK:
1. Replace front air control. Refer to "FRONT AIR CONTROL ".
2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
NG:
1. Replace in-vehicle sensor. Refer to "IN-VEHICLE SENSOR ".
2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between in-vehicle sensor harness connector M32 terminal 4 and front air control harness connector M50 terminal 27.
  4 - 27 : Continuity should exist.
4. Check continuity between in-vehicle sensor harness connector M32 terminal 4 and ground.
  4 - Ground : Continuity should not exist.
  
  Fig 4: Checking Continuity Between In-Vehicle Sensor Harness Connector M32 Terminal 4 And Connector M50 Terminal 27
OK or NG

OK:
1. Replace front air control. Refer to "FRONT AIR CONTROL ".
2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
NG: Repair harness or connector.
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR MOTOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector and in-vehicle sensor connector.
3. Check continuity between in-vehicle sensor harness connector M32 terminal 2 and 3 and front air control harness connector M50 terminal 34 and 33.
  2 - 34 : Continuity should exist.
  
  3 - 33 : Continuity should exist.
4. Check continuity between in-vehicle sensor harness connector M32 terminal 2 and 3 and ground.
  2, 3 - Ground : Continuity should not exist.
  
  Fig 5: Checking Continuity Between Harness Connector M32 Terminal 2 And 3 And Connector M50 Terminal 34 And 33
OK or NG

OK:
1. Replace in-vehicle sensor. Refer to "IN-VEHICLE SENSOR ".
2. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis. If code still exsists, GO TO 3.
3. Replace front air control. Refer to "FRONT AIR CONTROL ".
4. Go to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION " and perform self-diagnosis.
NG: Repair harness or connector.