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HOMESERVICE MANUALSPONTIAC1991SUNBIRD BASE, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSTESTINGISOLATION TEST PROCEDURE (V6 & 1992 4-CYLINDER)
1991 Pontiac Sunbird Base, 4D Sedan, Standard

Isolation Test Procedure (V6 & 1992 4-Cylinder)

1991 Pontiac Sunbird Base, 4D Sedan, StandardSECTION Isolation Test Procedure (V6 & 1992 4-Cylinder)
  1. Disconnect cruise control module connector. Turn ignition switch to ON position when checking voltage, or to OFF position when checking resistance.
  2. Turn cruise control switch to OFF position. Using a DVOM on 200-ohm scale, check between terminal "J" and ground. Resistance reading should be zero ohms. If reading is not zero ohms, check circuit No. 150/151 (Black wire) for open circuit.
  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  .
  4. Turn ignition off. Turn cruise control switch to ON position. With DVOM on 200-ohm scale, check resistance between terminals "C" and "J". Resistance reading should be 35-55 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 35-55 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", and "L" and "J". Voltage reading should be zero volts. If reading is not zero volts, go to CRUISE SWITCH SHORT TEST  .
  10. Depress and hold cruise switch ON and SET buttons simultaneously. 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. Place cruise switch in R/A position. 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. Turn cruise switch to ON position, and turn drive wheels manually. 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  .
  13. Turn ignition off. 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", and "H" and "K". Resistance should read infinity (open circuit). If reading is not correct, go to SERVO SHORT TEST  .
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