Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For circuit wiring diagram, see Fig 1
. For connector identification and locations, see CONNECTOR IDENTIFICATION
.
- If using CONSULT-II, go to next step. If using generic scan tool, go to step 3 .
- Check Vacuum Cut Valve By-Pass Valve Circuit (With CONSULT-II)
Turn ignition off and on. Select VC/V BYPASS/V in ACTIVE TEST mode with CONSULT-II. Press ON/OFF on CONSULT-II screen. Clicking noise should be heard from vacuum cut valve by-pass valve. For location, see Figure . If clicking noise is heard, go to step 7 . If clicking noise is not heard, go to next step. - Check Power Supply Circuit
Turn ignition off. Disconnect vacuum cut valve by-pass valve harness connector. Turn ignition on. Measure voltage between ground and vacuum cut valve by-pass valve harness connector terminal No. 1. See Fig 1 . If battery voltage exists, go to step 5 . If battery voltage does not exist, go to next step. - Detect Malfunctioning Part
Check the following:- Check fuse No. 9 (10-amp) located in fuse block under left side of instrument panel.
- Fuse block connector M1.
- Harness connectors M14 and B1.
- Harness for open or short between vacuum cut valve by-pass valve and fuse.
Repair as necessary. Perform DTC CONFIRMATION TEST to verify repair.
- Check Output Signal Circuit
Turn ignition off. Disconnect ECM harness connector. See Figure . Check continuity between vacuum cut valve by-pass valve harness connector terminal No. 2 and ECM harness connector terminal No. 2. See Fig 1 . Also, check harness for short to ground and short to power. If problem is found, go to next step. If problem is not found, go to step 7 . - Detect Malfunctioning Part
Check the following:- Harness connectors M14 and B1.
- Harness connectors M57 and F27.
- Harness for open or short between vacuum cut valve by-pass valve and ECM.
Repair as necessary. Perform DTC CONFIRMATION TEST to verify repair.
- Check Vacuum Cut Valve By-Pass Valve
Check vacuum cut valve by-pass valve as shown in illustration. See Fig 2 . If vacuum cut valve by-pass valve is okay, go to next step. If vacuum cut valve by-pass valve is not okay, replace vacuum cut valve by-pass valve. Perform DTC CONFIRMATION TEST to verify repair. - Check For Intermittent
Check for intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. Perform DTC CONFIRMATION TEST to verify repair.