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Home >> Hummer >> 2010 >> H3 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - DTC P0335 To DTC P1381 >> DTC P0412 or P0418 >> Component Testing

Component Testing

  1. Ignition OFF, disconnect the appropriate relay.
  2. Test for the following resistance between terminals 85 and 86.
    • 50-75 Ω-Secondary Air Injection Pump Relay
    • 70-110 Ω-Secondary Air Injection Solenoid Relay
    • If the resistance is not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    • 86 and 87
    • 86 and 30
    • 85 and 87
    • 87 and 30
    • If not the specified value, replace the relay.
  4. Install a 15 A fused jumper wire between relay terminal 86 and B+. Install a jumper wire between relay terminal 85 and ground. Test for less than 2 Ω between terminals 87 and 30.
    • If greater than the specified range, replace the relay.
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