Code 71: Traction Control Vacuum Solenoid
NOTE:
For component terminal identification, see TERMINAL IDENTIFICATION
. For wiring diagrams, see WIRING DIAGRAMS
article in this section.
- Turn ignition switch to ON position. Using a scan tester, actuate vacuum solenoid. With solenoid actuated, operating noise should be heard. If operating noise is not heard, go to next step. If operating noise is heard, go to step 4.
- Disconnect vacuum solenoid and fuel injection relay connectors. Using DVOM, check for continuity between vacuum solenoid connector terminal No. 1 and fuel injection relay connector terminal No. 5. If continuity does not exist, repair wiring harness between fuel injection relay and vacuum solenoid as necessary. If continuity exists, go to next step.
- Disconnect ECM connector. Ground ECM connector terminal No. 102. Check continuity between chassis ground and vacuum solenoid connector terminal No. 2. If continuity does not exist, repair wiring harness as necessary. If continuity exists, check solenoid vacuum. Go to next step.
- Remove vacuum hoses from solenoid. Ensure solenoid harness connector is disconnected. Connect a vacuum pump to solenoid nipple "A". Use jumper wires to connect battery voltage to solenoid terminals. See Fig 1 . With vacuum applied, nipple "B" unplugged, and negative jumper wire disconnected, solenoid should hold vacuum.
- With vacuum applied, nipple "B" unplugged, and negative jumper wire connected, solenoid should not hold vacuum. With vacuum applied, nipple "B" plugged, and negative jumper wire connected, solenoid should hold vacuum.
- If solenoid tests as described, check resistance between solenoid terminals. Resistance should be 36-44 ohms at 68°F (20°C). If resistance is not as specified, replace solenoid. If resistance is as specified, inspect throttle valve operation. Clean or repair as necessary.
- Connect a vacuum pump to 90 degree vacuum nipple on vacuum tank. Apply 19.8" Hg of vacuum to tank and ensure vacuum holds. Connect vacuum pump to straight nipple on vacuum tank. Plug 90 degree nipple. Apply 19.8" Hg of vacuum. Unplug 90 degree nipple and ensure vacuum releases. Replace tank as necessary.
- Remove Green stripe vacuum hose from vacuum actuator, located near throttle valve. Connect vacuum pump to actuator. With accelerator pedal depressed, apply 7.9" Hg of vacuum to actuator. Ensure actuator rod is pulled upward and vacuum is held. Repair actuator as necessary.