DTC C1305/21: Solenoid Identification Circuit: Procedure

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
   Fig 1: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the skid control ECU connector and the brake actuator connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A35-14 (SSEL) - A13-44 (SSEL)	Always	Below 1 Ω
   A35-14 (SSEL) - Body ground	Always	10 kΩ or higher
   A35-16 (SEL2) - A13-41 (SEL2)	Always	Below 1 Ω
   A35-16 (SEL2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the skid control ECU connector and the brake actuator connector.
   Fig 2: Identifying Skid Control ECU A35 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Start the engine.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A35-14 (SSEL) - Body ground	Low (Normal)	0 V
   A35-14 (SSEL) - Body ground	Middle	3.7 to 8.26 V
   A35-14 (SSEL) - Body ground	High	7.8 to 14 V
   A35-16 (SEL2) - Body ground	Low (Normal)	0 V
   A35-16 (SEL2) - Body ground	Middle	3.7 to 8.26 V
   A35-16 (SEL2) - Body ground	High	7.8 to 14 V

   OK

   Input voltage of SSEL and SEL2 is the same under all conditions.

NG → See step   5 

OK: Go to next step 

1. Turn the engine switch off.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Drive the vehicle at a speed of 24 km/h (15 mph) or more.
4. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC (C1305/21) is not output	A
   DTC (C1305/21) is 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 harness, 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 → See step   6 

A → See step   4