Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)

CHECK WIRE HARNESS (EC1 CONNECTOR - ECM)

CHECK ECM (KNK1, KNK2 VOLTAGE)

CHECK FOR INTERMITTENT PROBLEMS

INSPECT KNOCK SENSOR

CHECK WIRE HARNESS (EB2 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) can detect vibrations in a wide band of frequency (6 kHz to 15 kHz).
The sensor, located on the cylinder block, detects spark knocks. When a spark knock occurs, the knock sensor picks up vibrations in a specific frequency range. When the ECM detects signal voltage in this frequency range, it retards the ignition timing to suppress the knocking. The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor.

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)
  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 4.5 V or more
(1 trip detection logic)
  1. Open in knock sensor 1 or 2 circuit
  2. Knock sensor 1 or 2
  3. ECM

  1. Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)
  2. Reference: Inspect using an oscilloscope.
    The correct waveform is as shown.
    Item
    		Content
    Symbols (Terminal No.)
    		KNK1 (E16-29) - EKNK (E16-28)
    KNK2 (E16-21) - EKN2 (E16-20)
    Tool Setting
    		0.01 to 10 V/DIV., 0.01 to 10 msec./DIV.
    Condition
    		Engine speed maintained at 4,000 rpm after warming up engine

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)


INSPECTION PROCEDURE

HINT:
  1. DTC P0327 and P0328 are for the bank 1 knock sensor circuit.
  2. DTC P0332 and P0333 are for the bank 2 knock sensor circuit.
  3. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the EC1 connector.

  1. Using lead wires, connect the EC1 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. Race the engine at 3,000 rpm for 10 seconds or more.

  1. Check for DTCs.

    Result:
    Display
    		Proceed to
    DTC is same as when vehicle brought in (for example, P0327 and P0328 are output again, or P0332 and P0333 are output again)
    		A
    DTC is different from when vehicle brought in (for example, P0327 and P0328 are output at first, but then P0332 and P0333 are output, or vice versa)
    		B


B
Go to step 5
A


2.CHECK WIRE HARNESS (EC1 CONNECTOR - ECM)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the EC1 connector.

  1. Disconnect the E16 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    EC1 female connector 2 - E16-29 (KNK1)
    		Below 1 Ω
    EC1 female connector 5 - E16-28 (EKNK)
    		Below 1 Ω
    EC1 female connector 4 - E16-21 (KNK2)
    		Below 1 Ω
    EC1 female connector 6 - E16-20 (EKN2)
    		Below 1 Ω
    EC1 female connector 2 or E16-29 (KNK1) - Body ground
    		10 kΩ or higher
    EC1 female connector 5 or E16-28 (EKNK) - Body ground
    		10 kΩ or higher
    EC1 female connector 4 or E16-21 (KNK2) - Body ground
    		10 kΩ or higher
    EC1 female connector 6 or E16-20 (EKN2) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK ECM (KNK1, KNK2 VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the EC1 ECM connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage of the EC1 female connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    EC1 female connector 2 - EC1 female connector 5
    		4.5 to 5.5 V
    EC1 female connector 4 - EC1 female connector 6
    		4.5 to 5.5 V


NG
REPLACE ECM
OK


4.CHECK FOR INTERMITTENT PROBLEMS
NOTICE:
The fault may be intermittent. Check the harness and connectors carefully, and retest.

NEXT

END

5.INSPECT KNOCK SENSOR
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the EC1 connector.

  1. Measure the resistance of the EC1 male connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    EC1 male connector 2 - 5
    		120 to 280 kΩ
    EC1 male connector 4 - 6
    		120 to 280 kΩ


OK
CHECK FOR INTERMITTENT PROBLEMS
NG


6.CHECK WIRE HARNESS (EB2 CONNECTOR - KNOCK SENSOR)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)
HINT:
  1. If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the bank 1 side.
  2. If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the bank 2 side.

  1. Disconnect the EC1 connector.

  1. Disconnect the K3 and K4 knock sensor connectors.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Terminal No.
    		Specified Condition
    EC1 male connector 2 - K3-2
    		Below 1 Ω
    EC1 male connector 5 - K3-1
    		Below 1 Ω
    EC1 male connector 4 - K4-2
    		Below 1 Ω
    EC1 male connector 6 - K4-1
    		Below 1 Ω
    EC1 male connector 2 or K3-2 - Body ground
    		10 kΩ or higher
    EC1 male connector 5 or K3-1 - Body ground
    		10 kΩ or higher
    EC1 male connector 4 or K4-2 - Body ground
    		10 kΩ or higher
    EC1 male connector 6 or K4-1 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE KNOCK SENSOR