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Home >> Cadillac >> 2013 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls/Fuel - Hybrid (LZ1) - DTC P0010 To DTC P0341) >> Diagnostic Information and Procedures >> DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • You must perform the Circuit/System Verification first.
  • If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical .

P0324 

NOTE:

If DTC P0325, P0326, P0327, P0328, P0330, P0332, or P0333 are also set, diagnose those DTCs first.

DTC P0324 indicates an internal control module circuitry failure. If no external knock sensor circuit issues exist, replace the ECM.

P0325, P0326, P0327, P0328, P0330, P0332, P0333

  1. Verify the affected KS is properly tightened, refer to Fastener Tightening Specifications .
  2. Ignition OFF, disconnect the affected KS.
  3. Ignition OFF. Connect a DMM to both KS signal circuits, terminals A and B, at the KS. Set the DMM to the 400 mV AC scale, select the Hz mode. Let the reading stabilize at 0 Hz.
    4. NOTE:

    DO NOT tap on plastic engine components.

  4. Tap on the engine block with a non-metallic object near the KS and observe the DMM for a fluctuating frequency.
    • If the DMM does not display a fluctuating frequency while tapping on the engine block then replace the KS.
  5. Ignition OFF, with appropriate length jumper wires, connect the KS1 harness to the KS2 sensor and the KS2 harness to the KS1 sensor.
  6. Monitor the DTCs using a scan tool. Operate the vehicle within the conditions for running the DTC. Verify the fault does not follow the sensor in question.
    • If the fault follows the sensor in question, replace the KS.
  7. Ignition OFF, remove the jumper wires from the previous step.
  8. Measure for 2-3 volts between each of the following circuits and ground on the ECM side of the harness connector:
    • The KS signal circuit, terminal A
    • The KS signal circuit, terminal B
    • If less than the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the ECM.
    • If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the ECM.
  9. Test for intermittent or poor connections at the ECM, KS, and in-line connectors where present.
  10. If all circuits test normal, replace the ECM.
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