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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) - Diagnostics (2AZ-FE)) >> DTC P0325, P0327, P0328: Knock Sensor 1 Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool. 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 PTC 
    1. Clear the DTC (see DTC CHECK/CLEAR ).
    2. Warm up the engine.
    3. Run the engine at 3,000 rpm for 10 seconds or more.
    4. Connect the hand-held tester or the OBD II scan tool to the DLC3.
    5. Turn ON the ignition switch. Push the hand-held tester or the OBD II scan tool main switch ON.
    6. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES.
    7. Read the DTC.

      Result: 

      DTC RESULT

      Display (DTC output) Proceed to
      Only P0325 is output again A
      P0325, P0327 and/or P0328 are output again B
      P0325, P0327 and/or P0328 are not output again C
    1. B: Go to step   3 
    2. C: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
    3. A: GO TO NEXT STEP. 
  2. INSPECT KNOCK SENSOR 
    1. Check the knock sensor installation.
      Fig 1: Locating Knock Sensor
      G02907862Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Torque is 20 N.m (204 kgf.cm, 15 ft.lbf) 

    1. NG: TIGHTEN SENSOR 
    2. OK: REPLACE KNOCK SENSOR 
  3. CHECK WIRE HARNESS (ECM - KNOCK SENSOR) 
    1. Disconnect the E8 ECM connector.
    2. Measure the resistance of the wire harness side connector.
      Fig 2: Identifying E8 ECM Connector Terminals
      G02907863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Condition Specified Condition
      E8-1 (KNK1) - E8-28 (FKNK1) 20°C (68°F) 120 to 280kΩ
    1. NG: Go to step   5 
    2. OK: GO TO NEXT STEP. 
  4. INSPECT ECM (KNK1 VOLTAGE) 
    1. Disconnect the E8 ECM connector.
    2. Turn the ignition switch ON.
    3. Measure the voltage of the ECM terminals.
      4. Fig 3: Identifying E8 ECM Connector Terminals
      G02907864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Voltage: 

    TESTER CONNECTION AND CONDITION SPECIFICATIONS

    Tester Connection Specified Condition
    E8-1 (KNK1) - E8-28 (FKNK1) 4.5 to 5.5 V

    HINT:

    Reference: Inspection using an oscilloscope. After warming up, run the engine at 4,000 rpm. Check the waveform between terminal KNK1 and FKNK1 of the ECM connector.

    Fig 4: Identifying KNK1 Signal Waveform
    G02907865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND CONDITION SPECIFICATIONS

    Tester Connection Specified Condition
    E8-1 (KNK1) - E8-28 (FKNK1) Correct waveform is as shown
    1. NG: REPLACE ECM (See  REPLACEMENT  ) 
    2. OK: CHECK FOR INTERMITTENT PROBLEMS 
    NOTE: Fault may be intermittent. Check the harness and connectors carefully.
  5. INSPECT KNOCK SENSOR 
    1. Remove the knock sensor.
    2. Measure the resistance between the terminals.
      Fig 5: Measuring Resistance Between Knock Sensor Terminals
      G02907866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Resistance is 120 to 280 kΩ at 20°C (68°F) 

    1. NG: REPLACE KNOCK SENSOR 
    2. OK: REPAIR OR REPLACE HARNESS AND CONNECTOR 
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