TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams

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BAT/Brakes, ABS & TRAC Systems — TRAC ECU:, page 132

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TRAC ECU: — MK4 Supra Brakes, ABS & TRAC Systems, page 132
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Page text (OCR transcript)
BR–132

BRAKE SYSTEM – TRACTION CONTROL SYSTEM (TRAC)

TRAC ECU:

T10                    T9

6  5  4  3  2  1   13 12 11 10  9  8  7  6  5  4  3  2  1
12 11 10  9  8  7   26 25 24 23 22 21 20 19 18 17 16 15 14

RO6997

Symbols
(Terminals No.)          STD Voltage (V)          Condition

BAT        GND
(T9-12)  –  (T9-14)          10 – 14          Always

BM         GND
(T9-13)  –  (T9-14)          10 – 14          Always

IG1        GND
(T9-26)  –  (T9-14)          10 – 14          IG switch ON

ACM        GND
(T10-6)  –  (T9-14)          10 – 14          5 seconds after IG switch ON
                                               Sub throttle valve fully open

A          GND
(T10-4)  –  (T9-14)          10 – 14          5 seconds after IG switch ON
                                               Sub throttle valve fully open

Ā          GND
(T10-5)  –  (T9-14)          10 – 14          5 seconds after IG switch ON
                                               Sub throttle valve fully open

BCM        GND
(T10-12) –  (T9-14)          10 – 14          5 seconds after IG switch ON
                                               Sub throttle valve fully open

B          GND
(T10-10) –  (T9-14)          10 – 14          5 seconds after IG switch ON
                                               Sub throttle valve fully open

B̄          GND
(T10-11) –  (T9-14)          10 – 14          5 seconds after IG switch ON
                                               Sub throttle valve fully open

IDL1       GND
(T10-1)  –  (T9-14)          Below 1.0        Engine idling, Main throttle valve fully closed
                             10 – 14          Engine idling, Main throttle valve fully open

IDL2       GND
(T10-7)  –  (T9-14)          Below 1.0        IG switch ON, Sub throttle valve fully closed
                             10 – 14          IG switch ON, Sub throttle valve fully open

NEO        GND
(T9-10)  –  (T9-14)          Pulse generation  Idling

CSW        GND
(T9-5)   –  (T9-14)          Below 1.5        IG switch ON, TRAC cut switch pushed in
                             10 – 14          IG switch ON, TRAC cut switch released

PKB        GND
(T9-18)  –  (T9-14)          Below 1.5        IG switch ON, PKB switch ON
                                               Fluid in M/C reservoir above MIN level
                             10 – 14          IG switch ON, PKB switch OFF
                                               Fluid in M/C reservoir above MIN level

IND        GND
(T9-24)  –  (T9-14)          10 – 14          IG switch ON, TRAC indicator light ON

WT         GND
(T9-23)  –  (T9-14)          Below 2.0        IG switch ON, TRAC OFF indicator light ON
                             10 – 14          IG switch ON, TRAC OFF indicator light OFF

STP        GND
(T9-3)   –  (T9-14)          Below 1.5        Stop light switch OFF
                             8 – 14           Stop light switch ON

Tc         GND
(T9-11)  –  (T9-14)          10 – 14          IG switch ON

FRO        GND
(T9-20)  –  (T9-14)          Pulse generation  IG switch ON
                                               Slowly turn right front wheel

FLO        GND
(T9-6)   –  (T9-14)          Pulse generation  IG switch ON
                                               Slowly turn left front wheel

RRO        GND
(T9-19)  –  (T9-14)          Pulse generation  IG switch ON
                                               Slowly turn right rear wheel

RLO        GND
(T9-7)   –  (T9-14)          Pulse generation  IG switch ON
                                               Slowly turn left rear wheel