How do you replace 1999 GMC sierra Knock Sensor 2 Circuit Low input bank 2 Diag code is P0332?

Answer 1

My service engine light came on so I had it scanned the following code was found: PO332 - Knock Sensor 2 Circuit Low Input (Bank 2). ... for 8.1L engine

Measure the resistance of the appropriate KS with a DMM connected to battery ground.
Is the resistance of the KS within the specified range?

93-107K ohms

GMTRUCKTECH copied and pasted a flow chart but it's not easy to make them look like they look on the GM site. Those links just take you to the step they refer to on the same page. step 10 will take you to step 10 on this chart.

DTC P0327 or P0332

Circuit Description
The knock sensors (KS) produce an AC signal when specific frequencies are detected. When the engine operates, the powertrain control module (PCM) learns a minimum and maximum frequency of noise of normal engine operation. The KS system monitors both knock sensors in order to determine if knock is present. If the KS system determines that excessive knock is present, the PCM retards the spark timing based on the signals from the KS system. The PCM then retards the timing until no knock is present. When the PCM detects a frequency that is less than or more than a defined range, DTC P0327 will set for a failure in KS 1 which is located on bank 1 on the drivers side of the engine or DTC P0332 will set for a failure in KS 2 which is located on bank 2 on the passenger side of the engine.


Conditions for Running the DTC

• DTCs P0106, P0107, P0108, P0116, P0117, P0118, P0125, P1114, or P1115 are not set.
• The engine speed is between 1,600-3,000 RPM.
• The manifold absolute pressure (MAP) is less than 45 kPa.
• The engine coolant temperature (ECT) is more than 60°C (140°F).
• The engine run time is more than 20 seconds.
• The ignition more than 10 volts.

Conditions for Setting the DTC
The PCM determines that this frequency is less than or more than the expected amount for 3 seconds or more.


Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

• The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
• Clear the MIL and the DTC with a scan tool.

Diagnostic Aids
Inspect the KS for proper installation. A KS that is loose or over torqued may cause either DTC to set.

For an intermittent, refer to Intermittent Conditions .


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

1.This step verifies the malfunction is present.

2.This test will isolate the KS from the rest of the circuit.

3. Tapping on the engine block near the appropriate KS will simulate an engine knock.
Step

1 Did you perform the Diagnostic System Check-Engine Controls? go to step 2 Go to Diagnostic System Check - Engine Controls

2 Important: If an engine knock can be heard, repair the engine mechanical condition before proceeding with this diagnostic. Go to Step 3 Go to Diagnostic Aids

condition before proceeding with this diagnostic.
Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine.
Operate the engine within the Conditions for Running the DTC as close to the Freeze Frame/Failure Records data that you observed.
Does the scan tool indicate that this diagnostic failed this ignition?

3 Turn the ignition OFF. Disconnect the KS harness of the appropriate KS. Set the DMM to the 400 K ohm scale. Go to Step 4 Go to Step 6
Measure the resistance of the appropriate KS with a DMM connected to battery ground.
Is the resistance of the KS within the specified range?

93-107K ohms


4. 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. Go to Step 5 Go to Step 6
Tap on the engine block near the appropriate KS while observing the signal indicated on the DMM.
Is any signal indicated on the DMM while tapping on the engine block near the knock sensor?


and so on if you are following what I'm doing here. Take my advice and check the resistance of the sensor first. These charts notoriously take the long way. Anyone with a chart can probably figure out half of whats going on but experience saves time and cuts out or rearranges some of the steps. That and you do not have the equipment half of the steps refer to so it doesn't make sense to pay any attention to them till you absolutly need to get those values at which point you would need someone that had the equipment.