Terminals Of Ecu
- SKID CONTROL ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Terminal No. (Symbols) Terminal Description A19-1 (GND) Skid control ECU ground A19-2 - (Not used) A19-3 (FRR-) Front pressure decrease linear solenoid RH (-) output A19-4(FRR+) Front pressure decrease linear solenoid RH (+) output A19-5 (SMC1) Master cut solenoid 1 output A19-6 (CA2L) CAN communication line 2 (Braking and Driving bus) A19-7 (CA2H) CAN communication line 2 (Braking and Driving bus) A19-8 (ENA) Capacitor signal output A19-9 (PCK1) Pressure sensor 1 stuck check output A19-10 (RL-) Rear wheel speed sensor LH input A19-11 (RL+) Rear wheel speed sensor LH power supply output A19-12 - (Not used) A19-13 - (Not used) A19-14 (PMC1) Master cylinder pressure sensor 1 signal input A19-15 (FR-) Front wheel speed sensor RH input A19-16 (FR+) Front wheel speed sensor RH power supply output A19-17 (FRA+) Front pressure increase linear solenoid RH (+) output A19-18 (FRA-) Front pressure increase linear solenoid RH (-) output A19-19 (RLA+) Rear pressure increase linear solenoid LH (+) output A19-20 (RLA-) Rear pressure increase linear solenoid LH (-) output A19-21 (SS) Stroke simulator cut solenoid output A19-22 (BZ) Skid control buzzer output A19-23 (SP1) Speed signal output to combination meter A19-24 - (Not used) A19-25 (CTY) Start power supply input (Door) A19-26 (PAC1) Accumulator pressure sensor 1 signal input A19-27 (VCM) Pressure sensor 1 power supply output A19-28 (E) Pressure sensor 1 ground A19-29 (+BI3) +B Battery 3 A19-30 - (Not used) A19-31 (BSO3) Stroke simulator cut solenoid power supply output A19-32 (BSO1) SMC1 power supply output A19-33 (RLR-) Rear pressure decrease linear solenoid LH (-) output A19-34 (RLR+) Rear pressure decrease linear solenoid LH (+) output A19-35 (MR1) Motor relay 1 power supply output A19-36 (R1-) Motor relay 1 output A19-37 (MTT) Motor relay test input A19-38 (CBI1) Capacitor power supply input 1 A19-39 - (Not used) A19-40 - (Not used) A19-41 (VBZ) Skid control buzzer power supply output A19-42 (PRL) Rear wheel cylinder pressure sensor LH signal input A19-43 (+BI1) +B Battery 1 A19-44 (PFR) Front wheel cylinder pressure sensor RH signal input A19-45 (LBL) Brake fluid level warning switch input A19-46 (IG1) IG1 power supply Terminal No. (Symbols) Terminal Description A20-1 (SKS2) Brake pedal stroke sensor signal 2 input A20-2 - (Not used) A20-3 (SKS) Brake pedal stroke sensor signal 1 input A20-4 (SKG) Brake pedal stroke sensor ground A20-5 (VCSK) Brake pedal stroke sensor power supply output Terminal No. (Symbols) Terminal Description A21-1 (GND4) Skid control ECU ground A21-2 - (Not used) A21-3 (FLR-) Front pressure decrease linear solenoid LH (-) output A21-4 (FLR+) Front pressure decrease linear solenoid LH (+) output A21-5 No pin A21-6 (SMC2) Master cut solenoid 2 output A21-7 (PCK2) Pressure sensor 2 stuck check output A21-8 (CANL) CAN communication line 3 (V Bus) A21-9 (CANH) CAN communication line 3 (V Bus) A21-10 (RR-) Rear wheel speed sensor RH input A21-11 (RR+) Rear wheel speed sensor RH power supply output A21-13 - (Not used) A21-14 (PMC2) Master cylinder pressure sensor 2 signal input A21-15 (FL-) Front wheel speed sensor LH input A21-16 (FL+) Front wheel speed sensor LH power supply output A21-17 (FLA+) Front pressure increase linear solenoid LH (+) output A21-18 (FLA-) Front pressure increase linear solenoid LH (-) output A21-19 No pin A21-20 (RRA+) Rear pressure increase linear solenoid RH (+) output A21-21 (RRA-) Rear pressure increase linear solenoid RH (-) output A21-22 (+BI4) +B Battery 4 A21-23 - (Not used) A21-24 (TS) Signal check (Test mode) input A21-25 (STP) Stop light switch input A21-26 No pin A21-27 - (Not used) A21-28 (VCM2) Pressure sensor 2 power supply output A21-29 (CA1L) CAN communication line 1 (Steering Bus) A21-30 (CA1H) CAN communication line 1 (Steering Bus) A21-31 - (Not used) A21-32 (BSO2) SMC2 power supply output A21-33 (RRR-) Rear pressure decrease linear solenoid RH (-) output A21-34 (RRR+) Rear pressure decrease linear solenoid RH (+) output A21-35 No pin A21-36 (MR2) Motor relay 2 power supply output A21-37 (R2-) Motor relay 2 output A21-38 (+BI2) +B Battery 2 A21-39 - (Not used) A21-40 (CBI2) Capacitor power supply input 2 A21-41 (FAIL) Capacitor signal input A21-42 No pin A21-43 (PRR) Rear wheel cylinder pressure sensor RH signal input A21-44 (E2) Pressure sensor 2 ground A21-45 (PFL) Front wheel cylinder pressure sensor LH signal input A21-46 (IG2) IG2 power supply - CHECK SKID CONTROL ECU
- Disconnect the A19 and A21 ECU connectors and measure the voltage or resistance on the wire harness side.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:
Voltage cannot be measured with the connector connected to the skid control ECU as the connector is watertight.
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition A19-1 (GND) - Body ground W-B - Body ground Skid control ECU ground Always Below 1 Ω A19-29 (+BI3) - Body ground BE - Body ground +B input 3 Always 11 to 14 V A19-43 (+BI1) - Body ground B - Body ground +B input 1 Always 11 to 14 V A19-45 (LBL) - Body ground W - Body ground Brake fluid level warning switch input Brake fluid level is maximum level → minimum level 1.84 to 2.16 kΩ →
Below 1 ΩA19-46 (IG1) - Body ground L - Body ground IG1 power supply Engine switch on (IG) 11 to 14 V A21-1 (GND4) - Body ground W-B - Body ground Skid control ECU ground Always Below 1 Ω A21-22 (+BI4) - Body ground BE - Body ground +B input 4 Always 11 to 14 V A21-25 (STP) - Body ground B - Body ground Stop light switch input Stop light switch ON → OFF (Brake pedal depressed → released) 8 to 14 V →
Below 1.5 VA21-38 (+BI2) - Body ground GR - Body ground +B input 2 Always 11 to 14 V A21-46 (IG2) - Body ground R - Body ground IG2 power supply Engine switch on (IG) 11 to 14 V
- Disconnect the A19 and A21 ECU connectors and measure the voltage or resistance on the wire harness side.