Preparation For Testing
- Check vacuum hoses for leaks, cracks, or improper routing. Repair or replace as necessary. Check coolant level.
- Check electrical connections. Repair any frayed or broken wires. Ensure that all connections are clean and tight.
- Turn off all accessories. Place transmission in Neutral and set parking brake. Warm engine to normal operating temperature. If air cleaner must be moved, leave all vacuum hoses attached. Check to see that battery voltage is present at electric choke terminal while engine is running.NOTE: If vehicle will not start, see NO START TEST.
- Turn ignition off. Locate Self-Test connector (on left fender panel, near MCU) and insert a jumper wire between ground and Trigger sockets. See Fig 1 . Connect the positive lead of a analog volt/ohm meter to vehicle battery positive terminal, and the negative lead to Self-Test Output socket.
- Set voltmeter on 0-20 volt scale. Battery voltage may be shown. Remove PCV valve from valve cover. Using a vacuum tee, connect a vacuum gauge to canister purge solenoid valve hose, on canister side of hose.
- Models equipped with a delay valve have a tee and restrictor in the thermactor by-pass vacuum control line. Uncap restrictor while performing test. Recap after test.
NOTE:
Service codes are shown by voltage pulses or needle sweeps. The first digit is indicated by a series of pulses, the needle will drop to zero for 2 seconds, then the second digit of the code is displayed. After all service codes are displayed, the throttle kicker will retract.