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Circuit/System Testing

NOTE: Any communication codes, U-codes, that are set should be diagnosed first.
  1. Ignition OFF, disconnect the X2 harness connector at the K114B hybrid powertrain control module 2.
  2. Ignition ON, verify that a test lamp does not illuminate between the accessory wake up serial data 2 circuit terminal 69 X2 of the harness connector and B+.
    • If the test lamp illuminates, repair the circuit for a short to ground.
  3. Connect a 3 A fused jumper wire between the accessory wake up serial data 2 circuit terminal 69 X2 of the harness connector and B+. Verify the scan tool Ignition Accessory Signal parameter displays ON.
    • If the parameter does not display ON, repair the accessory wake up serial data 2 circuit for an open/high resistance.
  4. If all circuits test normal, replace the K20 ECM.
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