Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

1Gr-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Monitor description

  3. Monitor strategy

  4. Typical enabling conditions

  5. Typical malfunction thresholds

  6. Wiring diagram

  7. Inspection procedure

  8. Read value of dtc output (check knock sensor circuit)

  9. Check harness or connector (connector - ecm)

  10. Inspect ecm

  11. Check knock sensor

  12. Inspect knock sensor

  13. 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 Conditions
Trouble Areas
P0327
P0332
Output voltage of knock sensor 1 or 2 is less than 0.5 V (1 trip detection logic)
  1. Short in knock sensor 1 or 2 circuit
  2. Knock sensor 1 or 2
  3. ECM
P0328
P0333
Output voltage of knock sensor 1 or 2 is more than 4.5 V (1 trip detection logic)
  1. Open in knock sensor 1 or 2 circuit
  2. Knock sensor 1 or 2
  3. 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 ignition switch is turned off.
Reference: Inspection using an oscilloscope
DTCs P0327 and P0328 are for the bank 1 knock sensor circuit. 4Runner
The correct waveform is as shown.
Items
Contents
Terminals
KNK1 - EKNK or KNK2 - EKN2
Equipment Settings
0.01 to 10 V/Division, 0.01 to 10 msec./Division
Conditions
Keep engine speed at 4,000 rpm with warm engine

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


Related DTCs
P0327: Knock sensor (Bank 1) range check (Low voltage)
P0328: Knock sensor (Bank 1) range check (High voltage)
P0332: Knock sensor (Bank 2) range check (Low voltage)
P0333: Knock sensor (Bank 2) range check (High voltage)
Required Sensors / Components (Main)
Knock sensor
Required Sensors / Components (Related)
MAF meter, Crankshaft position sensor, ECT sensor
Frequency of Operation
Continuous
Duration
1 second
MIL Operation
Immediate
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


The monitor will run whenever these DTCs are not present
None
Battery voltage
10.5 V or more
Time after engine start
5 seconds or more
Ignition switch
ON
Starter
OFF

TYPICAL MALFUNCTION THRESHOLDS


Knock Sensor Range Check (Low voltage) P0327 and P0332:
Knock sensor voltage
Less than 0.5 V

Knock Sensor Range Check (High voltage) P0328 and P0333:
Knock sensor voltage
More than 4.5 V

WIRING DIAGRAM


DTCs P0327 and P0328 are for the bank 1 knock sensor circuit. 4Runner


INSPECTION PROCEDURE

HINT:
  1. DTCs P0327 and P0328 are for the bank 1 knock sensor circuit.
  2. DTCs P0332 and P0333 are for the bank 2 knock sensor circuit.
  3. Read freeze frame data using the intelligent tester. 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.
1.READ VALUE OF DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT)
  1. Disconnect the ED1 connector. 4Runner

  2. Disconnect the ED1 connector.

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

    Male Connector - Female Connector
    Terminal 2 - Terminal 4
    Terminal 5 - Terminal 6
    Terminal 4 - Terminal 2
    Terminal 6 - Terminal 5

  1. Warm up the engine.

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the intelligent tester on.

  1. Select the item: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

  1. 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

  1. Reconnect the ED1 connector.



Bnext
Go to step 4
A
next down

2.CHECK HARNESS OR CONNECTOR (CONNECTOR - ECM)
  1. Disconnect the ED1 connector. 4Runner

  2. Disconnect the ED1 connector.

  1. Disconnect the E5 ECM connector.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    ED1 female connector 2 - KNK1 (E5-29)
    		Below 1 Ω
    ED1 female connector 5 - EKNK (E5-28)
    		Below 1 Ω
    ED1 female connector 4 - KNK2 (E5-21)
    		Below 1 Ω
    ED1 female connector 6 - EKN2 (E5-20)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    ED1 female connector 2 or KNK1 (E5-29) - Body ground
    		10 kΩ or higher
    ED1 female connector 5 or EKNK (E5-28) - Body ground
    		10 kΩ or higher
    ED1 female connector 4 or KNK2 (E5-21) - Body ground
    		10 kΩ or higher
    ED1 female connector 6 or EKN2 (E5-20) - Body ground
    		10 kΩ or higher

  1. Reconnect the ED1 connector.

  1. Reconnect the ECM connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

3.INSPECT ECM
  1. Disconnect the E5 ECM connector. 4Runner

  2. Disconnect the E5 ECM connector.

  1. Turn the ignition switch on.

  1. Measure the voltage between the ECM terminals.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    KNK1 (E5-29) - EKNK (E5-28)
    		4.5 to 5.5 V
    KNK2 (E5-21) - EKN2 (E5-20)
    		4.5 to 5.5 V

  1. Reconnect the ECM connector.

    NOTICE:
    Fault may be intermittent. Check the wire harness and connectors carefully and retest.


NGnext
REPLACE ECM
OK
next down
CHECK FOR INTERMITTENT PROBLEMS

4.CHECK KNOCK SENSOR
  1. Check the knock sensor installation. 4Runner

  2. Check the knock sensor installation.

Torque:
20 N*m{204 kgf*cm, 15 ft.*lbf}


NGnext
REPAIR OR REPLACE KNOCK SENSOR
OK
next down

5.INSPECT KNOCK SENSOR
  1. Disconnect the ED1 connector. 4Runner

  2. Disconnect the ED1 connector.

  1. Measure the resistance between the terminals of the ED1 male connector.

    Standard resistance:
    Tester Connections
    		Specified Conditions
    ED1 male connector 2 - 5
    		120 to 280 kΩ
    ED1 male connector 4 - 6
    		120 to 280 kΩ

  1. Reconnect the connector.



OKnext
CHECK FOR INTERMITTENT PROBLEMS
NG
next down

6.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 ED1 connector. 4Runner

  2. Disconnect the ED1 connector.

  1. Disconnect the K1 and K2 knock sensor connectors.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    ED1 male connector 2 - K1-2
    		Below 1 Ω
    ED1 male connector 5 - K1-1
    		Below 1 Ω
    ED1 male connector 4 - K2-2
    		Below 1 Ω
    ED1 male connector 6 - K2-1
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    ED1 male connector 2 or K1-2 - Body ground
    		10 kΩ or higher
    ED1 male connector 5 or K1-1 - Body ground
    		10 kΩ or higher
    ED1 male connector 4 or K2-2 - Body ground
    		10 kΩ or higher
    ED1 male connector 6 or K2-1 - Body ground
    		10 kΩ or higher

  1. Reconnect the connector.

  1. Reconnect the knock sensor connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE KNOCK SENSOR