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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 P0418, P2257, or P2258: Secondary Air Injection Pump Relay >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition Off, disconnect the KR25 Secondary Air Injection Pump Relay, ignition On.
  2. Verify a test lamp illuminates between the relay coil ignition circuit terminal 86 or 1 and ground.
    • If the test lamp does not illuminate 
    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 the test lamp illuminates 
  3. Connect a DMM, set on the diode setting, between the control circuit terminal 85 or 2 and ground.
  4. Verify the DMM reading is greater than 2.5V or displays O.L. when commanding the Secondary Air Injection Pump Relay Off 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 Pump Relay On 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 KR25 Secondary Air Injection Pump Relay.
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