P0332
1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
DTC P0327 - Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
DTC P0328 - Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
DTC P0332 - Knock Sensor 2 Circuit Low Input (Bank 2)
DTC P0333 - Knock Sensor 2 Circuit High Input (Bank 2)
DESCRIPTION
A flat type knock sensor (non-resonant type) has a structure that can detect vibrations between approximately 6 kHz and 15 kHz.
Knock sensors are fitted onto the engine block to detect engine knocking.
The knock sensor contains a piezoelectric element which generates a voltage when it becomes deformed.
The voltage is generated when the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.
HINT: When any of DTCs P0327, P0328, P0332 and P0333 are set, the ECM enters fail-safe mode. During fail- safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch is turned off.
Reference: Inspection using an oscilloscope
The correct waveform is as shown.
MONITOR DESCRIPTION
The knock sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the piezoelectric element of the sensor vibrates. When the ECM detects the voltage in this frequency range, it retards the ignition timing to suppress the spark knock.
The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, and if the knock sensor output voltage is out of the normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Knock Sensor Range Check (Low voltage) P0327 and P0332:
Knock Sensor Range Check (High voltage) P0328 and P0333:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- DTCs P0327 and P0328 are for the bank 1 knock sensor circuit.
- DTCs P0332 and P0333 are for the bank 2 knock sensor circuit.
- Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
1. READ VALUE USING DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT)
(a) Disconnect the ED1 connector.
(b) Using lead wires, connect the connectors as follows.
(c) Warm up the engine.
(d) Run the engine at 3000 rpm for 10 seconds or more.
(e) Connect the Techstream to the DLC3.
(f) Turn the ignition switch on and turn the Techstream on.
(g) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(h) Read DTCs.
Result:
(i) Reconnect the ED1 connector.
B -- CHECK KNOCK SENSOR
A -- Continue to next step.
2. CHECK HARNESS OR CONNECTOR (CONNECTOR - ECM)
(a) Disconnect the ED1 connector.
(b) Disconnect the E5 ECM connector.
(c) Measure the resistance.
Standard resistance (Check for open):
Standard resistance (Check for short):
(d) Reconnect the ED1 connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT ECM
(a) Disconnect the E5 ECM connector.
(b) Turn the ignition switch on.
(c) Measure the voltage between the ECM terminals.
Standard voltage:
(d) Reconnect the ECM connector.
NOTE: Fault may be intermittent. Check the wire harness and connectors carefully and retest.
NG -- REPLACE ECM
OK -- CHECK FOR INTERMITTENT PROBLEMS
4. CHECK KNOCK SENSOR
(a) Check the knock sensor installation.
Torque: 20 Nm (204 kgf-cm, 15 ft-lbf)
NG -- REPAIR OR REPLACE KNOCK SENSOR
OK -- Continue to next step.
5. INSPECT KNOCK SENSOR
(a) Disconnect the ED1 connector.
(b) Measure the resistance between the terminals of the ED1 male connector.
Standard resistance:
(c) Reconnect the connector.
OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK SENSOR)
HINT:
- If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right bank side.
- If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left bank side.
(a) Disconnect the ED1 connector.
(b) Disconnect the K1 and K2 knock sensor connectors.
(c) Measure the resistance.
Standard resistance (Check for open):
Standard resistance (Check for short):
(d) Reconnect the connector.
(e) Reconnect the knock sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE KNOCK SENSOR