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Home >> Toyota >> 2004 >> Land Cruiser >> Repair and Diagnosis >> External Pages >> Different car >> Section 471 (Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics)) >> Circuit Inspection >> DTC C1246/46: Master Cylinder Pressure Sensor Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Start the inspection from step  1 in case of using the hand-held tester and start from step  2 in case of not using the hand-held tester.

  1. Check output value of the master cylinder pressure sensor. 

    PREPARATION: 

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester main switch ON.
    3. Select the DATA LIST mode on the hand-held tester.

      CHECK: 

      Check that the brake fluid pressure value of the master cylinder pressure sensor displayed on the hand-held tester is changing when depressing the brake pedal.

      OK: 

      Brake fluid pressure value must be changing. 

    1. OK: Go to step   4 . 
    2. NG: Go to next step. 
  2. Check master cylinder pressure sensor. 

    PREPARATION: 

    1. Install the LSPV gauge to the front caliper bleeder plug portion, and bleed the LSPV gauge.

      SST 09709-29018

    2. Remove the air cleaner inlet and battery clamp cover.

      CHECK: 

      Start the engine and depress the brake pedal, then check the relation between the fluid pressure and voltage of PMC and E2 terminals of the skid control ECU with connectors still connected.

      OK: 

      FRONT BRAKE CALIPER FLUID PRESSURE AND VOLTAGE SPECIFICATION

      Front brake caliper fluid pressure Voltage
      0 kPa (0 Kgf/cm2 , 0 psi) 0.37 to 0.63 V
      5,883 kPa (60 kgf/cm2 , 853 psi) 1.57 to 1.83 V
      11,768 kPa (120 kgf/cm2 , 1,706 psi) 2.77 to 3.03 V

      HINT:

      Voltage between terminals VCM and E2: 4.7 to 5.3 V

    1. NG: Replace master cylinder pressure sensor. 
    2. OK: Go to next step. 
  3. Check for open and short circuit in harness and connector between master cylinder pressure sensor and skid control ECU (See  HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION  ). 
    1. NG: Repair or replace harness or connector. 
    2. OK: Replace master cylinder pressure sensor. 
  4. Check whether or not the ECU terminal STP input voltage is changed when the stop light switch is turned on and off. 
    1. NO: Check the stop light switch circuit (See  DTC C1249/49 STOP LIGHT SWITCH CIRCUIT   ). 
    2. YES: Check and replace skid control ECU. 
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