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Home >> Chevrolet >> 1992 >> Beretta Base, 2.2 4, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Testing >> Isolation Test

Isolation Test

  1. Cruise control module connector disconnected. Use a DVOM. Ignition switch in ON position (when checking voltage) and ignition switch in OFF position (when checking resistance).
  2. Cruise control switch OFF, DVOM on 200 ohm scale. Check between terminal "J" and ground. Resistance reading should be zero ohms. If reading is not zero ohms, go to POWER CIRCUIT OPEN TEST  .
  3. Turn ignition on. With DVOM on 20 volt scale, check voltage between terminals "A" and "J", and "M" and "J". Voltage reading should be zero volts. If reading is not zero volts, go to CRUISE SWITCH SHORT TEST  . Turn ignition off.
  4. Cruise control switch on, DVOM on 200 ohm scale. Check resistance between terminals "C" and "J". Resistance reading should be 30-55 ohms. If reading is not correct, go to VENT CIRCUIT OPEN TEST  .
  5. With DVOM on 200 ohm scale, check resistance between terminals "K" and "J". Resistance reading should be 30-55 ohms. If reading is not correct, go to VAC CIRCUIT OPEN TEST  .
  6. With DVOM on 200 ohm scale, check resistance between terminals "F" and "H". Resistance reading should be 15-25 ohms. If reading is not correct, go to SPS CIRCUIT OPEN TEST  .
  7. Turn ignition on. With DVOM on 20 volt scale, check voltage between terminals "A" and "J". Battery voltage should be present. If battery voltage is not present, go to POWER CIRCUIT OPEN TEST  .
  8. With DVOM on 20 volt scale, check voltage between terminals "G" and "J". Battery voltage should be present. If battery voltage is not present, go to BRAKE CIRCUIT OPEN TEST  .
  9. With DVOM on 20 volt scale, check voltage between terminals "M" and "J", "L" AND "J". Voltage reading should be zero volts. If reading is not zero volts, go to CRUISE SWITCH SHORT TEST  .
  10. Cruise switch on and SET button pressed and held. With DVOM on 20 volt scale, check voltage between terminals "L" and "J". Battery voltage should be present. If battery voltage is not present, go to SC CIRCUIT OPEN TEST  .
  11. Cruise switch in R/A. With DVOM on 20 volt scale, check voltage between terminals "M" and "J". Battery voltage should be present. If battery voltage is not present, go to R/A CIRCUIT OPEN TEST  .
  12. Cruise switch on and drive wheels turned by hand. With DVOM on 20 volt scale, check voltage between terminals "A" and "D". Voltage should fluctuate between battery voltage and less than 7 volts. If reading is not correct, go to either VSS CIRCUIT OPEN TEST  or VSS CIRCUIT SHORT TEST  . Turn ignition off.
  13. With DVOM on 200 ohm scale, check resistance between terminals "F" and "J". Resistance should read infinity (open circuit). If reading is not correct, go to SPS CIRCUIT SHORT TEST  .
  14. Check resistance between terminals "F" and "C", "F" and "K", "H" and "C", "H" and "K". Resistance should read infinity (open circuit). If reading is not correct, go to SERVO RESISTANCE TEST  .
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