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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 157 (Engine Controls And Fuel - 4.6L - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0412 or P0418 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the appropriate relay.
  2. Test for the following resistance between terminals 85 and 86.
    • 50-85 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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