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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Controls And Fuel - 2.4L - DTC P0114 To DTC P0604) >> Diagnostic Information and Procedures >> DTC P0412, P041F, or P044F: Secondary Air Injection Valve >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the KR26 Secondary Air Injection Solenoid Valve Relay. Ignition ON.
  2. Verify a test lamp illuminates between the relay coil ignition circuit terminal 86 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ignition circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, 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. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the KR26 Secondary Air Injection Solenoid Valve Relay
    • If the test lamp illuminates 
  3. Connect a DMM, set on the diode setting, between the control circuit terminal 85 and ground.
  4. Verify the DMM reading is greater than 2.5V or displays O.L. when commanding the Secondary Air Injection Solenoid Valve Closed with a scan tool.
    • If 2.5V or less 
    1. Ignition OFF, disconnect the harness connector at the K20 engine Control Module
    2. Test for less than 1V between the control circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Ignition OFF.
    4. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the K20 engine Control Module
    • If greater than 2.5V or displays O.L. 
  5. Verify the DMM reading is less than 1V when commanding the Secondary Air Injection Solenoid Valve Open with a scan tool.
    • If 1V or greater 
    1. Ignition OFF, disconnect the harness connector at the K20 engine Control Module.
    2. Test for less than 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 engine Control Module.
    • If less than 1V 
  6. Test or replace the KR26 Secondary Air Injection Solenoid Valve Relay.
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