Diagnostic Procedure

CHECK POWER SUPPLY
1. Stop engine.
2. Disconnect IACV-AAC valve harness connector.
3. Turn ignition switch ON.
4. Check voltage between terminal 2 and ground with CONSULT-II or tester.
  
  Fig 2: Checking Voltage Between Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage : Battery voltage
OK or NG
1. OK : GO TO 3.
2. NG : GO TO 2.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M59, F27
- Fuse block (J/B) connector M27
- 10A fuse
- Harness for open or short between IACV-AAC valve and fuse
  1. : Repair harness or connectors.
CHECK OUTPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 101 and terminal 1. Refer to WIRING DIAGRAM .
  Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK : GO TO 4.
2. NG : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK IACV-AAC VALVE
Disconnect IACV-AAC valve harness connector.
- Check IACV-AAC valve resistance.
  Resistance : Approximately 10 Ω [at 25°C (77°F)]
- Check plunger for seizing or sticking.
- Check for broken spring.
Fig 3: Checking IACV-AAC Valve Resistance
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : GO TO 5.
2. NG : Replace IACV-AAC valve.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END.