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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 150 (Engine Control System - 3.6L (Ly7) - DTC P0442 To DTC P1551) >> DTC P0685, P0686, P0687, P0689 or P0690 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure for 70-110 ohms of resistance between terminals 85 and 86 of the PT relay.
    • If the resistance is not within the specified range, replace the PT relay.
  2. Measure for infinite resistance between the following terminals of the PT relay:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
      • If continuity is detected, replace the PT relay.
  3. Connect a 15-amp fused jumper wire from the positive terminal of the battery to relay terminal 85. Connect a jumper wire from the negative terminal of the battery to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay.
    • If the resistance measures more than 2 ohms, replace the PT relay.
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