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Home >> Chevrolet >> 2011 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P2600-P2603 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect and remove the X50A UBEC.
  2. Remove the KR75 powertrain relay.
  3. Test for 170-210 Ω between the powertrain relay switched output circuit terminal 87 and the auxiliary coolant pump relay control circuit at UBEC terminal X2-21.
    • If not within the specified range, replace the X50A UBEC.
  4. Test for greater than 2 Ω between UBEC B+ supply cable and the AFTERBOIL PUMP Fuse 4.
    • If less than the specified range, replace the X50A UBEC.
  5. Connect a 10 A fused jumper wire from the positive terminal of the battery to the powertrain relay switched output circuit terminal 87. Connect a jumper wire from the negative terminal of the battery to the auxiliary coolant pump relay control circuit at UBEC terminal X2-21. Test for less than 2 Ω between UBEC B+ supply cable and the AFTERBOIL PUMP Fuse 4.
    • If greater than the specified range, replace the X50A UBEC.
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