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How To Use Diagnostic Tests

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  1. Ensure all non-EEC related faults found while performing TROUBLE SHOOTING  have been corrected. DO NOT perform any DIAGNOSTIC TEST unless specifically instructed by a RETRIEVING DIAGNOSTIC TROUBLE CODES (QUICK TEST)  procedure. Follow each test step in order until fault is found. DO NOT replace any part unless directed here to do so. When more than one DTC is retrieved, start with first DTC displayed.
  2. Diagnostic tests ensure electrical circuits are okay before sensors or other components are replaced. Always test circuits for continuity between sensor and PCM. Test all circuits for short to power, opens or short to ground. Voltage Reference (VREF) and Voltage Power (VPWR) circuits should be tested with ignition on or as specified in DIAGNOSTIC TESTS.
  3. If measuring voltage or resistance at PCM and a breakout box is not available, always backprobe PCM harness connector. DO NOT connect any test light unless specified in testing procedure. All measurements are made by probing rear of connector (wiring harness side). Isolate both ends of a circuit and turn ignition switch to OFF position when checking for shorts or continuity, unless instructed otherwise.
  4. Disconnect solenoids and switches from harness before measuring continuity and resistance or applying voltage. After each repair, check all component connections and repeat RETRIEVING DIAGNOSTIC TROUBLE CODES (QUICK TEST)  under SELF-DIAGNOSTIC SYSTEM.
  5. An open circuit is defined as a resistance reading of greater than 5 ohms. This specification tolerance may be too high for some items in EEC-V system. If resistance approaches 5 ohms, always clean suspect connector and coat with protective dielectric silicone grease. A short is defined as a resistance reading of less than 10 k/ohms to ground, unless stated otherwise in DIAGNOSTIC TESTS.
  6. Fuel-contaminated engine oil may set some DTCs and effect engine performance. If oil is suspect, remove PCV valve from valve cover and repeat RETRIEVING DIAGNOSTIC TROUBLE CODES (QUICK TEST)  under SELF-DIAGNOSTIC SYSTEM. If problem is corrected, change engine oil.
  7. If instructed to replace Powertrain Control Module (PCM) after performing a diagnostic test, new PCM must be programmed. See PROGRAMMING .
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