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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 P0451: Evaporative Emission Control System Pressure Sensor >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • When a vehicle is brought into the workshop, leave it as is. Do not change the vehicle condition.
  • For example, do not tighten the fuel cap. Do not disassemble the pump module.
  1. CONFIRM DTC AND EVAP PRESSURE 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON without the engine start.
    3. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES.
    4. Confirm DTC.
    5. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/VAPOR PRESS.
    6. Read the EVAP pressure (VAPOR PRESS).
      7. Fig 1: DTC And EVAP Pressure Result Chart
      G02907919Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. B: Go to step   4 . 
    2. C: Go to EVAP INSPECTION PROCEDURE (See  EVAP INSPECTION PROCEDURE  ) 
    3. A: GO TO NEXT STEP. 
  2. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM) 
    1. Turn the ignition switch OFF.
    2. Disconnect the E5 ECM connector.
    3. Measure the resistance between the terminal E5-21 and the body ground.
      Fig 2: Identifying E5 ECM Connector Terminals
      G02907920Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Pump Module - ECM Result Chart
      G02907921Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. B: Go to step   7 . 
    2. A: GO TO NEXT STEP. 
  3. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM) 
    1. Remove the exhaust tail pipe.
    2. Remove the heat insulator under the canister.
    3. Disconnect the canister connector.
      4. Fig 4: Identifying Canister Harness Connector
      G02907922Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance between the terminal E5-21 and the body ground.
      5. Fig 5: Identifying ECM 21 Connector Terminal
      G02907923Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 6: Pump Module - ECM Test Result Chart
      G02907924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. A: Go to step   5 . 
    2. B: Go to step   6 . 
  4. CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM) 
    1. Turn the ignition switch OFF.
    2. Remove the exhaust tail pipe.
    3. Remove the heat insulator under the canister.
    4. Disconnect the canister connector.
    5. Measure the voltage and resistance of the C17 connector.
      Fig 7: Locating Canister Harness Connector
      G02907925Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TERMINALS VOLTAGE SPECIFICATIONS

      Terminal No. Specified Condition
      C17-4 - Body ground 4.5 to 5.5 V
      C17-3 - Body ground 4.5 to 5.5 V
      C17-2 - Body ground 100 Ω or less
      6. Fig 8: Identifying Canister Harness Connector Terminals
      G02907926Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 9: Pump Module ECM Test Result Chart
      G02907927Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. A: Go to step 5 
    2. B: Go to step   6 . 
  5. REPLACE PUMP MODULE 
    1. Remove the exhaust tail pipe.
    2. Remove the heat insulator under the canister.
    3. Disconnect the hoses and the connector.
    4. Remove the 3 bolts and the pump module with the O-ring.
    5. Install a new pump module with a new O-ring.
    6. Install the 3 bolts.
    7. Connect the hoses and the connector.
    8. Go to the next step before installing the exhaust tail pipe.
      9. Fig 10: Identifying Pump Module
      G02907928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NEXT: Go to step   8 . 
  6. REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR 

    In case that the exhaust tail pipe is removed, go to the next step before installing it.

    1. NEXT: Go to step   8 . 
  7. REPLACE ECM (See  REPLACEMENT  ) 
    1. NEXT: Go to step 8 
  8. CONFIRM PTC (AFTER REPAIR) 
    1. Turn the ignition switch ON.
    2. Clear the DTC with the hand-held tester.
    3. Wait for 60 seconds with the ignition switch ON.
    4. Confirm the current DTC. Enter the following menus: DIAGNOSIS/ENHANCED OBDII/DTC INFO/CURRENT DTC.
    5. If no DTC is displayed, the repair has been completed properly.
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