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Home >> GMC >> 2016 >> Yukon SLE, 4WD, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 32 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> Charging System Test >> Circuit/System Testing

Circuit/System Testing

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NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Verify a test lamp illuminates between the G13 Generator B+ circuit terminal 1 X2, 2 X2 or A X2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Remove the test lamp and disconnect the B+ cable at the G13 Generator.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, 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. Remove the test lamp, disconnect the battery negative cable, and disconnect the G13 Generator B+ cable.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the G13 Generator.
    • If the test lamp illuminates 
  2. Disconnect the X1 harness connector at the G13 Generator, engine running.
  3. Verify the scan tool Engine Control Module Generator F-Terminal Signal parameter is less than 5%.
    • If 5% or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the G13 Generator signal circuit terminal 2 X1 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • If less than 5% 
  4. Install a 3 A fused jumper wire between the signal circuit terminal 2 X1 and B+, engine running.
  5. Verify the scan tool Engine Control Module Generator F-Terminal Signal parameter is greater than 95%.
    • If 95% or less 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 95% 
  6. Test or replace the G13 Generator.
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