Test Description

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

The numbers below refer to the step numbers on the diagnostic table.

2: This step verifies a condition is present.
4: This step determines if there is a condition with the KS circuit. If the voltage increases when the circuit is grounded, this indicates that there is no condition with the KS circuit. If there is a condition with either circuit, the voltage will not increase when the circuits are connected to ground.

P0327 or P0332 Knock Sensor (KS) Circuit Low Voltage Bank 1 or Bank 2

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls 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	IMPORTANT: If you can hear an engine knock, repair the engine mechanical condition before proceeding with this diagnostic. Refer to Symptoms - Engine Mechanical in Engine Mechanical - 3.6L (LY7). Start the engine. Allow the engine to reach operating temperature. Turn OFF all accessories. Increase the engine speed to 2,000 RPM. Observe the appropriate KS Signal voltage parameter with a scan tool. Is the voltage more than the specified value?	0.75 V	Go to Step 3	Go to Step 4
3	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. Did the DTC fail this ignition?	-	Go to Step 4	Go to Diagnostic Aids
4	Disconnect the appropriate knock sensor. Connect a fused jumper wire between the signal circuit of the knock sensor (KS) and a good ground. Start the engine. Observe the appropriate KS Signal voltage parameter with a scan tool. Is the voltage more than the specified value?	1.0 V	Go to Step 6	Go to Step 5
5	Test the signal and the low reference circuit of the knock sensor for the following conditions: For an open For the signal and the low reference circuit for being shorted together For the signal and the low reference circuit for being short together and are shorted to ground For the signal and the low reference circuit for being short together and are shorted to a voltage Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 10	Go to Step 7
6	Test for an intermittent and for a poor connection at the 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 10	Go to Step 8
7	Test for an intermittent and for a poor connection at the engine control module (ECM). 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 10	Go to Step 9
8	Replace the KS. Refer to the appropriate procedure: Knock Sensor (KS) Replacement - Bank 1 Knock Sensor (KS) Replacement - Bank 2 Did you complete the replacement?	-	Go to Step 10	-
9	Replace the ECM. Refer to Engine Control Module (ECM) Replacement . Did you complete the replacement?	-	Go to Step 10	-
10	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. Did the DTC fail this ignition?	-	Go to Step 2	Go to Step 11
11	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