Supra MKIII Diagnostic Box


Contact

System

Routes to

Used With

Application

+B

Battery

EFI Main Relay

E1, FP, W


VF1

TCCS Check Connector

TCCS Pin: VF

E1

TCCS Fuel Trim Feedback

VF2

Not Used



Not Used in the MKIII Supra

CC0




Not Used in the MKIII Supra

TE1 (aka T1)

TCCS TE1

TCCS TE1

E1

CEL/MIL Diagnosis System (Error Codes)(alt. link)Timing Adjustment

TE2

TCCS Test Mode


Not Used in the MKIII Supra


FP

Fuel Pump Bypass

Fuel Pump after Relay and Resistor

B+

Fuel Pump Test

W

Check Engine/Malfunction Indicator Lamp

TCCS Pin: W, Comb. Meter MIL

B+

Not Used in the MKIII Supra

E1

TCCS Ground


VF1, TE1, OX1, OX2, TS, TT, IG-

Used in many test proceedures.

IG-

Igniter

Igniter IG-, Tachometer

Tachometer, E1

Tachometer (see #7)

OX1

TCCS Lambda (O2) Sensor

TCCS Pin: OX

E1

Lambda (O2) Sensor Diagnosis

OX2

TCCS Lambda (O2) Sensor (Cali. 7M-GE Only)

TCCS Pin: OX2 (Cali. Only)

E1

Sub-Oxygen Sensor Diagnosis

TS

TEMS

TEMS Comp. Pin: HCK

E1

TEMS Diagnosis

TT

ECT (Automatic Transmission)

ECT Pin: DG

IG-, E1

Auto. Response Diag.

CC2




Not Used in the MKIII Supra

TC




Not Used in the MKIII Supra

AB




Not Used in the MKIII Supra

HINT: Go to the last page of each section of the TEWD and look for the illustration above among the connector diagrams.

NOTE: Connectors Marked in RED may not be employed in this vehicle.

E1 is ,more specifically, the TCCS' Computer ground (BTW, E2 is the TCCS' sensor ground). +B and +B1 are both 12v supplies from the EFI main relay. VF1 represents the TCCS' VF diagnostic signal (this operates in 3 different modes), FP is a test feed to the fuel pump (bypasses protection circuitry and the relay and resistor pack)..... yada, yada, yoda....

How you use the diagnostic block varies from one circuit to the next. The TSRM and TEWD cover when and how to test each circuit.