Diagnostic trouble code P0327 P0328 P0332 P0333 4GR-FSE Engine

Description

Wiring diagram

Inspection procedure

READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)

CHECK WIRE HARNESS AND CONNECTOR (CONNECTOR - ECM)

INSPECT ECM

INSPECT KNOCK SENSOR

CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK 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 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.  

DTC No.	DTC Detection Condition	Trouble Area
P0327 P0332	Output voltage of knock sensor 1 or 2 is 0.5 V or less (1 trip detection logic)	Short in knock sensor 1 or 2 circuit Knock sensor 1 or 2 ECM
P0328 P0333	Output voltage of knock sensor 1 or 2 is 4.5 V or more (1 trip detection logic)	Open in knock sensor 1 or 2 circuit Knock sensor 1 or 2 ECM

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 to OFF.

Reference: Inspection using an oscilloscope The correct waveform is as shown.

Item	Content
Terminals	KNK1 - EKNK or KNK2 -EKN2
Equipment Settings	0.01 to 10 V/DIV., 0.01 to 10 ms./DIV.
Conditions	Keep engine speed at 4,000 rpm with warm engine

Wiring diagram

Inspection procedure

HINT:

1. DTCs P0327 and P0328 are for the bank 1 knock sensor circuit.

1. DTCs P0332 and P0333 are for the bank 2 knock sensor circuit.

1. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred .

 

1.READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)

1. Disconnect the EG1 connector.

2. Using lead wires, connect the connectors as follows.

    

   Male Connector - Female Connector

   Terminal 4 - Terminal 1

   Terminal 5 - Terminal 2

   Terminal 1 - Terminal 4

   Terminal 2 - Terminal 5

3. Warm up the engine.

4. Run the engine at 3,000 rpm for 10 seconds or more.

5. Connect the intelligent tester to the DLC3.

6. Turn the engine switch on (IG) and turn the intelligent tester ON.

7. Enter the following menus: Power train / Engine / DTC.

8. Read DTCs.

   Result:

   Display	Proceed to
   DTCs same as when vehicle brought in P0327, P0328 > P0327, P0328 or P0332, P0333 > P0332, P0333	A
   DTCs different from when vehicle brought in P0327, P0328 > P0332, P0333 or P0332, P0333 > P0327, P0328	B

9. Reconnect the EG1 connector.

B	Go to step 4

A

2.CHECK WIRE HARNESS AND CONNECTOR (CONNECTOR - ECM)

1. Disconnect the EG1 connector.

2. Disconnect the E4 ECM connector.

3. Measure the resistance.

   Standard resistance (Check for open):

   Tester Connection	Specified Condition
   EG1 female connector 4 - KNK1 (E4-28)	Below 1 ?
   EG1 female connector 5 - EKNK (E4-30)	Below 1 ?
   EG1 female connector 1 - KNK2 (E4-29)	Below 1 ?
   EG1 female connector 2 - EKN2 (E4-31)	Below 1 ?

   Standard resistance (Check for short):

   Tester Connection	Specified Condition
   EG1 female connector 4 or KNK1 (E4-28) - Body ground	10 k? or higher
   EG1 female connector 5 or EKNK (E4-30) - Body ground	10 k? or higher
   EG1 female connector 1 or KNK2 (E4-29) - Body ground	10 k? or higher
   EG1 female connector 2 or EKN2 (E4-31) - Body ground	10 k? or higher

4. Reconnect the EG1 connector.

5. Reconnect the ECM connector.

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.INSPECT ECM

1. Disconnect the EG1 connector.

2. Turn the engine switch on (IG).

3. Measure the voltage between the EG1 terminals.

   Standard voltage:

   Tester Connection	Specified Condition
   EG1 female connector 4 - 5	4.5 to 5.5 V
   EG1 female connector 1 - 2	4.5 to 5.5 V

4. Reconnect the ECM connector.

NG	REPLACE ECM

OK
CHECK FOR INTERMITTENT PROBLEMS

4.INSPECT KNOCK SENSOR

1. Disconnect the EG1 connector.

2. Measure the resistance of the EG1 male connector.

   Standard resistance:

   Tester Connection	Specified Condition
   EG1 male connector 4 - 5	120 to 280 k?
   EG1 male connector 1 - 2	120 to 280 k?

3. Reconnect the EG1 connector.

OK	CHECK FOR INTERMITTENT PROBLEMS

NG

5.CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK SENSOR)

HINT:

1. If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right bank side.
2. If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left bank side.

1. Disconnect the EG1 connector.

2. Disconnect the G1 and G2 knock sensor connectors.

3. Measure the resistance of the wire harness side connector.

   Standard resistance (Check for open):

   Tester Connection	Specified Condition
   EG1 male connector 4 - G1-2	Below 1 ?
   EG1 male connector 5 - G1-1	Below 1 ?
   EG1 male connector 1 - G2-2	Below 1 ?
   EG1 male connector 2 - G2-1	Below 1 ?

   Standard resistance (Check for short):

   Tester Connection	Specified Condition
   EG1 male connector 4 or G1-2 - Body ground	10 k? or higher
   EG1 male connector 5 or G1-1 - Body ground	10 k? or higher
   EG1 male connector 1 or G2-2 - Body ground	10 k? or higher
   EG1 male connector 2 or G2-1 - Body ground	10 k? or higher

4. Reconnect the EG1 connector.

5. Reconnect the knock sensor connector.

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE KNOCK SENSOR