DTC C146C: Open in ABS Motor Relay Circuit [08/2015 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Select the Active Test using the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2015 - ] .
   ABS/VSC/TRAC
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Motor Relay	ABS motor relay	Relay ON/OFF	Operating sound of motor can be heard

4. Check the operating sound of the pump motor when operating it using the Techstream.

   Result

   Result	Proceed to
   Operating sound is heard.	A
   Operating sound is not heard.	B

B → See step   3 

A: Go to next step 

HINT: 

This DTC is stored when a problem is identified in the brake actuator assembly.

The ABS motor relay is in the brake actuator assembly.

Therefore, motor relay inspection and motor relay unit inspection cannot be performed. Be sure to check if the DTC is output again before replacing the brake actuator assembly.

1. Turn the ignition switch off.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
3. Turn the ignition switch off.
4. Start the engine.
5. Drive the vehicle at a speed of 40 km/h (25 mph) or more for 30 seconds or more.
6. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   Result

   Result	Proceed to
   DTC C146C is not output.	A
   DTC C146C is output.	B

   HINT: 

   • If a speed signal of 40 km/h (25 mph) or more is received by the skid control ECU with the ignition switch ON, the skid control ECU performs self diagnosis of the motor circuit.
   • If the normal system code is output (No DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly.
   • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
   • If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.

B → See step   6 

A → See step   5 

1. Check that the ABS NO. 1 (50 A) fuse is normal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   If the result is not as specified, replace the ABS NO. 1 fuse (fusible link block assembly).

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A49-1 (+BM) - Body ground*1 A94-1 (+BM) - Body ground*2	Always	11 to 14 V

   *1: for 2AR-FE (w/o Dynamic Radar Cruise Control System)

   *2: for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE

   TEXT IN ILLUSTRATION
   
   

   *A	for 2AR-FE (w/o Dynamic Radar Cruise Control System)
   *B	for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE
   *a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT) 

OK: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A49-13 (GND2) - Body ground*1 A94-13 (GND2) - Body ground*2	Always	Below 1 Ω

   *1: for 2AR-FE (w/o Dynamic Radar Cruise Control System)

   *2: for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE

   TEXT IN ILLUSTRATION
   
   

   *A	for 2AR-FE (w/o Dynamic Radar Cruise Control System)
   *B	for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE
   *a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT) 

OK → See step   6