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Preparation For Testing

  1. Check vacuum hoses for leaks, cracks, or improper routing. Repair or replace as necessary.
  2. Check electrical connections. Repair any frayed or broken wires. Ensure that all connections are clean and tight.
  3. Turn all accessories off. 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.
    NOTE: If vehicle will not start, see No Start Test (No. 1 for 4 and 6 Cylinder, No. 18 for V8).
  4. Turn ignition off. Locate Self-Test connector and insert a jumper wire between ground and Trigger sockets. Connect the positive lead of a needle-type voltmeter to vehicle battery positive terminal, and the negative lead to Self-Test output socket. Set voltmeter on 15-20 volt scale. Battery voltage may be shown.
  5. On 4 cylinder engines, disable canister purge system by disconnecting and plugging hose from engine side of canister purge valve. On V8 engines, remove PCV valve from valve cover.
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