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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1653 (Engine Control System & Fuel System - Hybrid (Hp2) 6.0L (LZ1) - DTC P0315 To DTC P1255/DTC P064A) >> DTC P0336 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Ignition OFF, disconnect the harness sensor connector at the B26 crankshaft position sensor.
  2. Ignition OFF, vehicle systems OFF, this may take 2 minutes, test for less than 1 Ω between the low reference circuit terminal B and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal C and ground.
    • If less than the specified range, test the 5 V reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.
    • If less than the specified range, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. Ignition OFF, connect a 3 A fused jumper wire to the signal circuit terminal A.
  6. Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The crankshaft position active counter should increment.
    • If the crankshaft position active counter increments, test or replace the B26 crankshaft position sensor.
    • If the crankshaft position active counter does not increment, replace the K20 ECM.
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