Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: 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.

Check ABS MTR relay operation.
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 ACTIVE TEST mode on the hand-held tester.
Check: the operation sound of the ABS MTR relay individually when operating it with the hand-held tester.

OK: The operation sound of the ABS MTR relay should be heard.

NG: Go to step 3.

If OK , go to step 2.
Check for short circuit in harness and connector between BM of motor relay and brake actuator and MT of ABS & BA & TRAC & VSC ECU . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
OK: Check and replace ABS & BA & TRAC & VSC ECU.

If NG , go to step 3.
Check voltage between terminal 1 of engine room R/B No. 8 (for ABS MTR relay) and body ground.
Preparation: Remove ABS MTR relay from engine room R/B No. 8.

Check: Measure the voltage between terminal 1 of engine room R/B No. 8 (for ABS MTR relay) and body ground.

Fig 1: Locating Terminal 1 Of Engine Room R/B No. 8
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Voltage: 10-14 V.

NG: Check and repair harness or connector.

If OK , go to step 4.
Check ABS MTR relay.
Check: continuity between following terminals of motor relay.

Fig 2: Testing ABS MTR relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: ABS MTR relay Specifications (No Voltage Applied)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Apply battery positive voltage between terminals 3 and 4.
2. Check continuity between terminals.
  
  Fig 4: ABS MTR relay Specifications (Voltage Applied)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: Replace ABS MTR relay.

If OK , go to step 5.
Check continuity between terminal BM (2) of engine room R/B No. 8 (for ABS MTR relay) and terminal MT (27) of ABS & BA & TRAC & VSC ECU.
Preparation: Disconnect the connector from the ABS & BA & TRAC & VSC ECU.

Check:
1. Check continuity between terminal BM (2) of engine room R/B No. 8 and terminal GND (28) of ABS & BA & TRAC & VSC ECU.
2. Check continuity between terminal BM (2) of engine room R/B No. 8 and terminal MT (27) of ABS & BA & TRAC & VSC ECU.
OK: continuity.

Fig 5: Testing ABS MTR relay Circuit
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Repair or replace harness or brake actuator.

If OK , go to step 6.
Check for open and short circuit in harness and connector between ABS MTR relay and ABS & BA & TRAC & VSC ECU . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .

NG: Repair or replace harness or connector.

OK: If the same code is still output after the DTC is deleted, check the contact condition of each connection. If the connections are normal, the ECU may be defective.