Inspection Procedure

HINT:

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

1. Check ABS motor relay operation. 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch ON and press the hand-held tester main switch ON.
   3. Select the item "ABS MTR RELAY" in the ACTIVE TEST and operating it using the hand-held tester.

   CHECK: 

   Check the operation sound of the ABS motor relay when operating it using the hand-held tester.

   OK: 

   The operation sound of the ABS motor relay should be heard. 

   1. OK: Replace brake actuator assembly. 
      NOTE: When replacing the brake actuator assembly, perform the zero point calibration (see PRE-CHECK ).
   2. NG: Go To Next Step. 
2. Measure voltage between terminal 5 of ABS R/B and body ground. 

   PREPARATION: 

   1. Remove the ABS MTR relay from the ABS R/B.
   2. Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminal 5 of the ABS R/B (for ABS MTR relay) and body ground.

   OK: 

   Voltage: 10 to 14 V 

   Fig 1: Identifying ABS R/B Connector Terminal 5

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Go to step 5. 
   2. OK: Go To Next Step. 
3. Check ABS MTR relay. 

   CHECK: 

   Measure the resistance between each pair of the terminal of the motor relay.

   OK: 

   ABS MTR RELAY RESISTANCE
   
   

   Tester Connection	Specified Condition
   Terminals 1 and 2	Approximately 80 Ω
   Terminals 3 and 5	10 kΩ or higher

   CHECK: 

   1. Apply battery positive voltage between terminals 1 and 2.
   2. Measure the resistance between terminals.

   OK: 

   ABS MTR RELAY RESISTANCE
   
   

   Tester Connection	Specified Condition
   Terminals 3 and 5	Below 1 Ω

   Fig 2: Checking ABS MTR Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Replace ABS MTR relay. 
   2. OK: Go To Next Step. 
4. Check for open and short circuit in harness and connector between ABS R/B (for ABS MTR relay) and skid control ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. NG: Repair or replace harness and connector. 
   2. OK: If same code is still output after DTC is deleted, check contact condition of each connection. If connections are normal, ECU may be defective. 
5. Check ABS CUT relay. 

   CHECK: 

   Measure the resistance between each terminal of the ABS CUT relay.

   OK: 

   ABS CUT RELAY RESISTANCE
   
   

   Tester Connection	Specified Condition
   Terminals 1 and 2	Approximately 100 Ω
   Terminals 3 and 5	10 kΩ or higher

   CHECK: 

   1. Apply battery voltage between terminals 1 and 2.
   2. Measure the resistance between terminals 3 and 5 of ABS CUT relay.

   OK: 

   ABS CUT RELAY RESISTANCE
   
   

   Tester Connection	Specified Condition
   Terminals 3 and 5	Below 1Ω

   Fig 3: Checking ABS CUT Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Replace ABS CUT relay. 
   2. OK: Go To Next Step. 
6. Check ABS No. 1 fuse. 

   PREPARATION: 

   Remove the ABS No. 1 fuse from the engine room J/B.

   CHECK: 

   Measure the resistance.

   OK: 

   Resistance: Below 1 Ω 

   1. NG: Replace ABS No. 1 fuse. 
   2. OK: Repair or replace harness and connector.