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Circuit/System Testing

NOTE:
  • Use the Wiring Schematics to verify the items listed below:
    • The control module's B+, and ground circuits.
    • The control module terminal numbers.
  • Some control module ground circuits may require up to 20 min after the ignition is turned Off before achieving a resistance reading of less than 5 Ω. In most cases the readings will drop below 20 Ω within 1 min indicating the control modules are going to sleep.
  1. Ignition Off, disconnect the connector(s) at the appropriate control module.
  2. Verify a test lamp illuminates between each ground circuit terminal and B+
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Verify a test lamp illuminates between each B+ circuit terminal and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the control module.
    • Go to next step: If the test lamp illuminates 
  5. Verify voltage at each B+ circuit terminal is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on B+ circuit.

    • Go to next step: If the specified value 
  6. Verify a test lamp illuminates between each ignition circuit terminal and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the ignition circuit for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the ignition circuit a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the control module.
    • Go to next step: If the test lamp illuminates 
  7. Verify voltage at each ignition circuit terminal is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on ignition circuit.

    • Go to next step: If the specified value 
  8. Replace the control module.
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