Inspection Procedure

HINT:

Start the inspection from step 1 when using the hand-held tester and start from step  3 when not using the hand-held tester.

1. Check operation of the motor relay (H/B motor relay). 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch to the ON position.
   3. Select ACTIVE TEST mode on the hand-held tester.
   ACTIVE TEST MODE REFERENCE
   
   

   Item	Vehicle Condition/Test Details	Diagnostic Note
   H/B MOT RELAY	Turns H/B motor relay ON/OFF	Operation sound of motor can be heard

   CHECK: 

   Check operation sound of the H/B motor individually when operating it with the hand-held tester.

   OK: 

   The operation sound of the H/B motor can be heard. 

   1. NG : Go to step   3 . 
   2. OK : Go to next step. 
2. Reconfirm DTC (See  DTC CHECK / CLEAR   ). 

   PREPARATION: 

   1. Clear the DTCs.
   2. Turn the ignition switch OFF.
   3. Depress the brake pedal more than 20 times.
   4. Turn the ignition switch to the ON position.
   5. Wait until the pump motor stops.
   6. Depress the brake pedal several times until the pump motor turns on.
   7. Wait until the pump stops.
   8. Repeat (f) and (g) 3 times.

   CHECK: 

   Check if the same DTCs are detected.

   RESULT: 

   DTC OUTPUT RESULT
   
   

   DTC is output	A
   DTC is not output	B

   1. B : END. 
   2. A : Replace master cylinder solenoid (See  DISASSEMBLY  ). 
3. Check ABS2 fuse (Access Cab., Standard Cab.)/ABS No. 1 fuse (Double Cab.). 

   PREPARATION: 

   Remove the ABS2 fuse/ABS No. 1 fuse.

   CHECK: 

   Measure the resistance of the ABS2 fuse/ABS No. 1 fuse.

   OK: 

   Resistance: Below 1 Ω (Continuity) 

   1. NG : Check for short circuit in all the harnesses and components connected to ABS2 fuse/ABS No. 1 fuse and replace fuse. 
   2. OK : Go to next step. 
4. Measure the voltage of the master cylinder solenoid (skid control ECU +BM1, +BM2 terminal). 

   PREPARATION: 

   Disconnect connectors S29 and S30 of the skid control ECU.

   CHECK: 

   Measure the voltage according to the value(s) in the table below.

   OK: 

   SKID CONTROL ECU TERMINALS VOLTAGE SPECIFICATIONS
   
   

   Tester Connection	Specified Condition
   S29-2 (+BM1) - Body ground	10 to 14 V
   S30-2 (+BM2) - Body ground	10 to 14 V

   Fig 1: Identifying Skid Control ECU +BM1, +BM2 Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Check and replace harness and connector (+BM1 and +BM2 circuit). 
   2. OK : Go to next step. 
5. Check harness and connector (GND terminal). 

   PREPARATION: 

   Disconnect connectors S29 and S30 of the skid control ECU.

   CHECK: 

   Measure the resistance between terminal GND (GND1, GND2, and GND3) and body ground.

   OK: 

   Fig 2: Identifying Skid Control ECU GND Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Below 1 Ω (Continuity) 

   1. NG : Check and replace harness and connector (GND circuit). 
   2. OK : Go to next step. 
6. Reconfirm DTC (See  DTC CHECK / CLEAR   ). 

   PREPARATION: 

   1. Clear the DTCs.
   2. Turn the ignition switch OFF.
   3. Depress the brake pedal more than 20 times.
   4. Turn the ignition switch to the ON position.
   5. Wait until the pump motor stops.
   6. Depress the brake pedal several times until the pump motor is turns on.
   7. Wait until the pump stops.
   8. Repeat (f) and (g) 3 times.

   CHECK: 

   Check if the same DTCs are detected.

   RESULT: 

   DTC OUTPUT RESULT
   
   

   DTC is output	A
   DTC is not output	B

   1. B : END. 
   2. A : Replace hydraulic brake booster (See  REMOVAL  ).