AT/Automatic Transmission — Inspection of Electronic Control Components, page 29

AUTOMATIC TRANSMISSION — Troubleshooting (Electronic Control System)     AT-29

INSPECTION OF ELECTRONIC CONTROL COMPONENTS

1. INSPECT VOLTAGE OF ECT ECU CONNECTOR
(a) Remove the cowl side trim of passenger side.
(b) Turn on the ignition switch.
(c) Measure the voltage at each terminal.

[Diagram showing ECT ECU connector with voltmeter]

[Diagram showing ECT ECU connector pinout with terminals labeled:
S₂  SL  PWR N  OD₁ L₁ L₂
                        L₃
S₁                      IDL
                        DG
IG  +B BK 2  L GND OD₁ SP₁ SP₂]

Terminal          Measuring condition                                    Voltage (V)

L₁ — GND         Throttle valve fully closed                            12
                 Throttle valve fully closed to fully open              12 to 0
                 Throttle valve fully open                              0

L₂ — GND         Throttle valve fully closed                            12
                 Throttle valve fully closed to fully open              12 to 0 to 12
                 Throttle valve open                                    12

L₃ — GND         Throttle valve fully closed                            12
                 Throttle valve fully closed to fully open              12 to 0 to 12 to 0 to 12
                 Throttle valve open                                    12

IDL — GND        Throttle valve fully closed                            0
                 Throttle valve opening above 1.5°                      12

SP₁ — GND        Cruise control       Standing still                    5 or 0
                 main switch OFF      Engine running, vehicle moving    2.5

BK — GND         When brake pedal is depressed                          12
                 When brake pedal is not depressed                      0

2 — GND          "2" range                                              10 ~ 16
                 Except "2" range                                       0 ~ 2

L — GND          "L" range                                              10 ~ 16
                 Except "L" range                                       0 ~ 2

N — GND          "N" range                                              10 ~ 16
                 Except "N" range                                       0 ~ 2