For 1990-2009 cars
Engine Controls Components
Engine Controls Schematics
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

### Circuit Description

The PCM contains integrated Knock Sensor (KS) diagnostic circuitry. Input signals from the knock sensors are used to detect engine detonation, allowing the PCM to retard Ignition Control (IC) spark timing based on the amplitude and frequency of the KS signal being received. The knock sensors produce an AC signal under all engine operating conditions. During engine operation, the PCM calculates the average voltage of each knock sensor's signal. If the knock sensor system is operating normally, the PCM should monitor KS signal voltages varying over 0.5 volt above and below the calculated average voltage. If the PCM detects a Knock Sensor 2 signal voltage within the calculated average voltage range, DTC P0332 will set.

### Conditions for Running the DTC

• | No TP sensor, VSS, CKP, MAF or ECT sensor DTCs set.

• | Engine coolant temperature is greater than 75°C (167°F).

• | Throttle angle is greater than 3%.

• | Engine load is greater than 20%.

• | Engine speed is between 1000 and 4000 RPM.

• | Maximum system spark retard is less than 15 degrees.

• | System voltage is greater than 9 volts.

### Conditions for Setting the DTC

The PCM detects a Knock Sensor 2 signal voltage within the calculated average range.

### Action Taken When the DTC Sets

• | The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.

• | The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data.

### Conditions for Clearing the MIL/DTC

• | The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has run and passed.

• | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

• | The DTC can be cleared by using a scan tool.

### Diagnostic Aids

Check for the following conditions:

• | Poor connection at the PCM or Knock Sensor 2.

| Inspect knock sensor 2 and PCM connectors for backed out terminals, broken locks, and improperly formed or damaged terminals.

• | Misrouted harness.

| Inspect the knock sensor harness to ensure that it is not routed too close to high voltage wires such as spark plug leads.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

### Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

1. Ensures that the malfunction is present.

2. If sent here from symptoms, proceed with the diagnostic table.

#### DTC P0332 - Knock Sensor Circuit Bank #2

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check
2 | Important: If a mechanical engine knock can be heard, repair the engine mechanical problem before proceeding with this diagnostic. Refer to Engine Noise Diagnosis in Engine Mechanical.

1. Operate the engine within conditions specified in Conditions for Setting the DTC.
2. Using a scan tool, monitor Specific DTC info for DTC P0332 until the DTC P0332 test runs.

Does scan tool indicate DTC P0332 failed this ignition?

--

Go to Step 4

Go to Step 3

3 |

1. Turn ON the ignition, with the engine OFF.
2. Review and record scan tool Fail Records data for DTC P0332.
3. Operate vehicle within Fail Records conditions.
4. Using a scan tool, monitor Specific DTC info for DTC P0332 until the DTC P0332 test runs.

Does the scan tool indicate DTC P0332 failed this ignition?

--

Go to Step 4

Go to Diagnostic Aids

4 |

1. Disconnect the PCM and the Knock Sensor.
2. Check the KS circuit for opens and shorts to ground.
3. If a problem is found, repair as necessary. Refer to Wiring Repairs .

Was problem found?

--

Go to step 7

Go to Step 5

5 |

1. Check the KS signal circuit for a poor terminal connection at the knock sensor.
2. If a problem is found, repair as necessary. Refer to Intermittents and Poor Connections Diagnosis and Repairing Connector Terminals .

Was problem found?

--

Go to Step 7

Go to Step 6

6 | Replace the knock sensor. Refer to Knock Sensor Replacement - Bank 2 . Is action complete? | -- | Go to Step 7 | --
7 |

1. Review and record Fail Records data
2. Clear DTCs.
3. Operate the vehicle within Fail Records conditions.
4. Using a scan tool, monitor Specific DTC info for DTC P0332 until the DTC P0332 test runs.

Does the scan tool indicate DTC P0332 failed this ignition?

--

Go to Step 2

System OK