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: Intake door does not change. Intake door motor does not operate normally.

Fig 1: Identifying Intake Door Motor Circuit

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

CHECK BODY GROUND CIRCUIT FOR INTAKE DOOR MOTOR

Fig 2: Body Ground Circuit For Intake Door Motor Continuity Table
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Checking Body Ground Circuit For Intake Door Motor
Courtesy of NISSAN MOTOR CO., U.S.A.

Continuity should exist.

If OK, check harness for short.

OK or NG
1. OK: GO TO 2.
2. NG: Repair harness or connector.
CHECK CIRCUIT CONTINUITY BETWEEN EACH TERMINAL ON A/C CONTROL UNIT AND ON INTAKE DOOR MOTOR

Fig 4: A/C Control Unit Terminal And Intake Door Motor Continuity Table
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Checking Circuit Continuity Between Terminals On A/C Control Unit And On Intake Door Motor
Courtesy of NISSAN MOTOR CO., U.S.A.

Continuity should exist.

If OK, check harness for short.

OK or NG
1. OK: GO TO 3.
2. NG: Repair harness or connector.
CHECK FOR A/C CONTROL UNIT OUTPUT
Measure voltage across A/C control unit harness terminals and body ground.

Fig 6: A/C Control Unit Output Voltage Table
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Replace intake door motor.
2. NG: Replace A/C control unit.