Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant. The KS mounting surface should be free of burrs, casting flash, and foreign material.
For an intermittent condition, refer to Intermittent Conditions .

DTC P0327 or P0332

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module (PCM) Connector End Views
1	Did you perform the Diagnostic System Check-Engine Controls?	-	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Start the engine. Observe the DTC information with a scan tool. Does the scan tool display any other DTCs?	-	Go to Diagnostic Trouble Code (DTC) List	Go to Step 3
3	IMPORTANT: If an engine mechanical noise can be heard, repair the condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical in Engine Mechanical-3.8L. Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition?	-	Go to Step 4	Go to Diagnostic Aids
4	Turn OFF the ignition. Disconnect the affected knock sensor (KS). Set the DMM to the 400K Ω scale. Measure the resistance from the KS to a good ground with the DMM. Is the resistance of the KS within the specified range?	93-107K Ω	Go to Step 5	Go to Step 11
5	With the DMM still connected, set the DMM to the 400 mV AC Hertz scale. Refer to Measuring Frequency in Wiring Systems. IMPORTANT: Do not tap on plastic engine components. Tap on the engine block near the KS with a non-metallic object while observing the signal indicated on the DMM. Is a signal indicated on the DMM while tapping on the engine block?	-	Go to Step 6	Go to Step 11
6	Set the DMM to the DC voltage scale. Turn ON the ignition, with the engine OFF. Measure the voltage from the KS signal circuit to a good ground with the DMM. Is the voltage more than the specified value?	0.5 V	Go to Step 7	Go to Step 8
7	Turn OFF the ignition. Disconnect the powertrain control module (PCM). Test the KS signal circuit for a short to voltage. Refer to Testing for a Short to Voltage in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 12
8	Turn OFF the ignition. Disconnect the PCM harness connector. Test the KS signal circuit for the following conditions: An open A high resistance A short to ground Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 9
9	Test for an intermittent and for a poor connection at the affected KS. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 10
10	Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 13	Go to Step 12
11	Replace the affected KS. Refer to Knock Sensor (KS) 1 Replacement or Knock Sensor (KS) 2 Replacement . Did you complete the replacement?	-	Go to Step 13	-
12	Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement . Did you complete the replacement?	-	Go to Step 13	-
13	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition?	-	Go to Step 2	Go to Step 14
14	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List	System OK