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  1. Turn ignition off. Check vacuum hoses for cracks or leaks. Replace hoses as necessary. If no vacuum leaks are found, disconnect vacuum switch connector.
  2. Check for continuity between terminal No. 1 of vacuum switch and body ground. If continuity is not present, check vacuum switch installation or faulty ground connection. If continuity is present, check vacuum switch operation.
  3. If switch is not operating properly, replace vacuum switch. If switch is operating properly, disconnect vacuum pump connector. Check for continuity between terminal No. 2 connector and body ground.
  4. If continuity is not present, check for open between terminal No. 2 and body ground. Also test body ground circuit. If continuity is present, check vacuum pump operation.
  5. If vacuum pump is not operating properly, replace vacuum pump. If pump is operating properly, reconnect vacuum switch and pump connectors. Disconnect computer connector and check for continuity between terminal No. 9 and body ground.
  6. If no continuity is present, check for open between terminal No. 9 of computer and terminal No. 1 of vacuum switch. If continuity is present, start engine and let engine idle.
  7. Check for continuity between terminal No. 9 and body ground. If continuity is present, check for short circuit between terminal No. 9 of computer and terminal No. 1 of vacuum switch.
  8. If no continuity is present, stop engine and check for continuity between terminal No. 1 and body ground. If no continuity is present, check for open between terminal No. 1 of computer and terminal No. 1 of vacuum switch.
  9. If continuity is present, check for continuity between terminal No. 1 and body ground with vacuum pump connector disconnected. If continuity is present, check for short between terminal No. 1 of computer and terminal No. 1 of vacuum pump. If no continuity is present, replace cruise control computer.
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