P0332
4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0327, P0328, P0332, P0333: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
DESCRIPTION
A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of frequencies: 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 engine 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 a 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, or if the knock sensor output voltage is outside 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:
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and wait 10 seconds.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the pending DTC [B].
HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0327, P0328, P0332 or P0333.
11. Check the DTC judgment result.
HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 5 minutes.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result [C].
HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
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 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 Freeze Frame Data.
PROCEDURE
1. READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)
(a) Disconnect the EG1 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 Techstream to the DLC3.
(f) Turn the engine switch on (IG) and turn Techstream on.
(g) Enter the following menus: Powertrain / Engine / Trouble Codes.
(h) Read DTCs.
Result:
(i) Reconnect the EG1 connector.
B -- INSPECT KNOCK SENSOR
A -- Continue to next step.
2. CHECK WIRE HARNESS AND CONNECTOR (CONNECTOR - ECM)
(a) Disconnect the EG1 connector.
(b) Disconnect the E4 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
(d) Reconnect the EG1 connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT ECM
(a) Disconnect the EG1 connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(d) Reconnect the EG1 connector.
NG -- REPLACE ECM Removal
OK -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
4. INSPECT KNOCK SENSOR
(a) Disconnect the EG1 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result:
(c) Reconnect the EG1 connector.
B -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
A -- Continue to next step.
5. 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 EG1 connector.
(b) Disconnect the G1 and G2 knock sensor connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
(d) Reconnect the EG1 connector.
(e) Reconnect the knock sensor connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE KNOCK SENSOR Removal