ATGE/A340 Automatic Trans (GE) — O D Main Switch & O D Off Indicator Light Circuit, page 88

AT1–88
AT340E (2JZ–GE) AUTOMATIC TRANSMISSION – TROUBLESHOOTING

O D Main Switch & O D OFF Indicator Light Circuit

CIRCUIT DESCRIPTION
The O/D main switch contacts go off when the switch is pushed in and come on when it is pushed out. In O/D
main switch OFF position, the O/D OFF indicator light lights up, and the ECM prohibits shifting to overdrive. The
ECM also causes the O/D OFF indicator light to blink when a malfunction is detected. In this case, connecting
the terminals in the DLC2 or DLC1 can display the malfunction code.

WIRING DIAGRAM

From Ignition Switch

1J   5
J/B No.1
10 A GAUGE
1E   12

ECM
4 – 6 V

O/D OFF
Indicator Light
Y   1   2   V-G   5   V-G   28
II1   E10
OD2

1
P3

2 V-G   V-G   To DLC2

O/D Main*
Switch

4
W-B
1E

(*) O/D Main Switch
Contacts go off with button pushed in.
Contacts go on with button pushed out.

Q04354