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Switch Test Procedure: Notes

  1. When ECM has diagnosed all systems 3 times "70" will appear on display panel. This indicates start of switch tests. When ready to begin test, depress brake pedal. Code "71" should appear.
    NOTE: Each test action must be performed within 10 seconds from the time the display code appears on panel. Otherwise ECM will store test as having failed.
  2. When code "71" appears on panel, depress brake pedal again. Code "72" should appear. When code "72" appears, depress throttle to wide open position and release. Code "73" should appear.
  3. When code "73" appears, shift transmission lever from "Drive" to "Neutral". Code "74" should appear. When code "74" appears, shift transmission lever to "Reverse" then to "Park" position. Code "78" should appear.
  4. When code "78" appears, depress "Average" button on the MPG display panel. Code "79" should appear. When code "79" appears, depress "Reset" button on MPG panel. This completes switch tests.
  5. The ECM will now display switch test codes which failed. Each code that failed will display until defective component is repaired or retested properly. The ECC will remain in diagnostic mode and display "00" until ECC mode is selected or ignition is turned "OFF".
    NOTE: Switch test diagnosis chart will be given for trouble code "72" only. All other switch test codes are unrelated to DEFI diagnosis.
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