Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

NOTE:

Perform the Diagnostic System Check - Vehicle prior to using these diagnostic procedures.
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. Replace the ECM.

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

Ignition OFF, disconnect the affected B68 KS.
Ignition OFF. Connect a DMM to both KS signal circuits, terminals A and B, at the affected B68 KS. Set the DMM to the 400 mV AC scale, select the Hz mode. Let the reading stabilize at 0 Hz.

NOTE: DO NOT tap on plastic engine components.

Tap on the engine block with a non-metallic object near the affected B68 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 affected B68 KS.
Verify the affected B68 KS is properly tightened, refer to Fastener Tightening Specifications (6.2L LS3) or Fastener Tightening Specifications (6.2L L99) .
Ignition OFF, with appropriate length jumper wires, connect the KS1 harness to the B68 KS2 sensor and the KS2 harness to the B68 KS1 sensor.
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 appropriate B68 KS.
Ignition OFF, remove the jumper wires from the previous step.
Measure for 2-3 volts between each of the following circuits and ground on the ECM side of the harness connector:
- The B68 KS signal circuit, terminal A
- The B68 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 K20 ECM.
- If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 ECM.
Test for intermittent or poor connections at the K20 ECM, B68 KS, and in-line connectors where present.
If all circuits test normal, replace the K20 ECM.