Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

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 Circuit

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

CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN IN-VEHICLE SENSOR AND BODY GROUND
Disconnect in-vehicle sensor harness connector.

Fig 2: Checking In-Vehicle Sensor Circuit Between In-Vehicle Sensor And Body Ground (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Checking In-Vehicle Sensor Circuit Between In-Vehicle Sensor And Body Ground (2 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 2.
2. NG: GO TO 4.
CHECK IN-VEHICLE SENSOR GROUND CIRCUIT BETWEEN IN-VEHICLE SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.

Fig 4: Checking In-Vehicle Sensor Ground Circuit (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Checking In-Vehicle Sensor Ground Circuit (2 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

If OK, check harness for short.

OK or NG
1. OK: GO TO 3.
2. NG: Repair harness or connector.
CHECK IN-VEHICLE SENSOR
Refer to "INTAKE SENSOR ".

OK or NG
1. OK:
  1. Replace auto amp.
  2. Go to self-diagnosis step-by-step procedure (refer to "SELF-DIAGNOSIS ") 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 step-by-step procedure (refer to "SELF-DIAGNOSIS ") and perform self-diagnosis STEP 2. Confirm that code No. 20 is displayed.
CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP. (LCU)
Disconnect auto amp. (LCU) harness connector.

Fig 6: Checking In-Vehicle Sensor Circuit Between Ambient Sensor And Auto Amp. (LCU) (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 7: Checking In-Vehicle Sensor Circuit Between Ambient Sensor And Auto Amp. (LCU) (2 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

If OK, check harness for short.

OK or NG
1. OK:
  1. Replace auto amp. (LCU).
  2. Go to self-diagnosis step-by-step procedure (refer to "SELF-DIAGNOSIS ") and perform self-diagnosis STEP 2. Confirm that code No. 20 is displayed.
2. NG: Repair harness or connector.