Diagnostic Procedure

INSPECTION START
Do you have CONSULT-II?

Yes or No
1. Yes: GO TO 2.
2. NO: GO TO 3 .
CHECK VACUUM CUT VALVE BYPASS VALVE CIRCUIT
WITH CONSULT-II
1. Turn ignition switch off and then on.
2. Select VC/V BYPASS/V in active test mode with CONSULT-II.
3. Touch ON/OFF on CONSULT-II screen.
  
  Fig 1: Displaying CONSULT-II ACTIVE TEST Screen
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Make sure that clicking sound is heard from the vacuum cut valve cut valve bypass valve.
  OK OR NG
1. OK: GO TO 7 .
2. NG: GO TO 3.
CHECK VACUUM CUT VALVE BYPASS VALUE POWER SUPPLY CIRCUIT
1. Turn ignition switch off.
2. Disconnect vacuum cut valve bypass valve harness connector.
  
  Fig 2: Identifying EVAP Canister And Vacuum Cut Valve Bypass Value
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch on.
4. Check voltage between vacuum cut valve bypass valve terminal 1 and ground with CONSULT-II or tester.
  
  Fig 3: Checking Voltage Between Vacuum Cut Valve Bypass Valve Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  OK OR NG
1. OK: GO TO 5 .
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M5, B1
- Fuse block (J/B) connector M19
- 15A fuse
- Harness for open or short between vacuum cut valve bypass valve and fuse
1. Repair harness or connectors.
CHECK VACUUM CUT VALVE BYPASS VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch off.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 28 and vacuum cut valve bypass valve terminal 2. 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 7 .
2. NG: GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B3, M6
- Harness connectors M81, F49
- Harness for open or short between vacuum cut valve bypass valve and ECM
1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK VACUUM CUT VALVE BYPASS VALVE
WITH CONSULT-II
1. Reconnect harness disconnected connectors.
2. Turn ignition switch ON.
3. Perform VC/V BYPASS/V in ACTIVE TEST mode.
4. Check air passage continuity and operation delay time under the following conditions.
  
  Fig 4: Checking Vacuum Cut Valve Bypass Valve
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  WITHOUT CONSULT-II
  
  Check air passage continuity and operation delay time under the following conditions.
  
  Fig 5: Checking Vacuum Cut Valve Bypass Valve
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  OK OR NG
1. OK: GO TO 8.
2. NG: Replace vacuum cut valve bypass valve.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. INSPECTION END