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Systematic System Check

  1. Terminals on the edge board connector at the electronic control module are numbered from 1 to 15 starting with the Black ground wire on the end as No. 1. Turn the ignition on and unplug the connector from the electronic control module.
  2. Ground a test light and check terminal No. 10 for voltage. If test light fails to light, check the 3-Amp fuse and the circuit to the ignition switch. If No. 10 shows voltage when key is on, attach a test light to No. 1 and No. 10 again. If light fails to work, unit has a bad ground.
  3. Leave the test light grounded to No. 1 and check for voltage at No. 4 with brake pedal depressed. If the light is on prior to pedal depression and stays on during depression, the brake switch is out of adjustment.
  4. If the light does not come on when the brake pedal is depressed, the brake light circuit is defective or the clutch safety switch is out of adjustment. Unplug the instrument panel switch at 8-prong connector 8" behind cruise control switch.
  5. Test voltage at Orange wire from the main harness. Reconnect the plug. Test voltage at terminal No. 2 when and only when "RESUME" button is depressed. If light does not operate, replace the instrument panel switch. Test voltage at terminal No. 3 when and only when "SET" button is depressed.
  6. If voltage is not present, replace instrument panel switch. Connect jumper wires from terminals No. 10 to No. 12 and No. 13. Connect jumpers from terminals No. 14 and No. 15 to ground. Start vehicle and let idle with transmission in Neutral (manual) or Park (automatic) and with parking brake applied.
  7. If brake safety switch checked previously is functioning properly and valve body is working properly, it should be possible to increase engine speed by momentarily grounding a jumper wire from terminal No. 5. Speed should drop instantly when wire is removed from ground.
  8. If this fails to control engine speed, check the vacuum motor by removing the small long vacuum hose from the valve body and applying vacuum to the hose. Engine speed should increase. If speed does not increase, check connections from electronics to the valve body, and if they check out good, replace the valve body.
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