Inspection Procedure

1. Remove the ABS3 fuse from engine room No 1 relay block
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   ABS3 (25 A) fuse	Always	Below 1 Ω

Fig 1: Identifying ABS3 Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ABS3 FUSE 

OK: Go to next step 

1. Install the ABS3 fuse.
2. Remove the ABS SOL relay.
3. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   3 - 5	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	Voltage is applied between terminals 1 and 2	Below 1 Ω

Fig 2: Identifying ABS Solenoid Relay (ABS SOL)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ABS SOLENOID RELAY (ABS SOL) 

OK: Go to next step 

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

   Standard Voltage 

   STANDARD VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   ABS SOL relay terminal 3 - Body ground	Always	11 to 14 V

Fig 3: Identifying Engine Room No. 2 Relay Block (Power Source Terminal)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK: Go to next step 

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
2. Disconnect the skid control ECU connectors
3. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   A35-11 (R+) - ABS SOL relay terminal 1	Always	Below 1 Ω
   A35-11 (R+) - Body ground	Always	10 kΩ or higher
   J78-2 (SR) - ABS SOL relay terminal 2	Always	Below 1 Ω
   J78-2 (SR) - Body ground	Always	10 kΩ or higher
   J78-13 (AST) - ABS SOL relay terminal 5	Always	Below 1 Ω
   J78-13 (AST) - Body ground	Always	10 kΩ or higher

Fig 4: Identifying Harness And Connector (Skid Control ECU - Engine Room No. 2 Relay Block)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Install the ABS SOL relay
2. Reconnect the skid control ECU connectors.
3. Clear the DTCs (See DTC CHECK / CLEAR  ).
4. Start the engine
5. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more
6. Check if the same DTC is recorded (See DTC CHECK / CLEAR  ).

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTCs (C0278/11 and C0279/12) are not output	A
   DTCs (C0278/11 and/or C0279/12) are output	B

   HINT:

   • If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
   • If the normal system code is output (no trouble codes are output), slightly jiggle the connectors, wire harnesses, and fuses of the skid control ECU and/or brake actuator assembly. Make sure that no DTCs are output
   • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU and/or brake actuator assembly, inspect and repair the connector or wire harness
   • It is suspected that the DTCs were output due to a bad connection of the connector terminal

B: REPLACE SKID CONTROL ECU  (See REMOVAL  )

A: CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)  (See DIAGNOSIS SYSTEM  )