ATGE/A340 Automatic Trans (GE) — Dtc 64 Lock–up Solenoid valve Circuit, page 75

DTC 64 Lock–up Solenoid valve Circuit

CIRCUIT DESCRIPTION

The SL solenoid valve is turned ON and OFF by signals from the ECM to control the hydraulic pressure acting
on the lock–up relay valve, which then controls operation of the lock–up clutch.
If a malfunction occurs in this circuit and diagnostic trouble code 64 is stored in memory, the O/D OFF indicator
light does not blink.
Fail Safe Function
If the ECM detects a malfunction, it turns the lock–up solenoid valve OFF.

DTC No. | Diagnostic Trouble Code Detection Condition | Trouble Area

64
(a) Solenoid resistance is 8 Ω or lower
(short circuit) when solenoid energized.
(b) Solenoid resistance is 100 kΩ or higher (open
circuit) when solenoid is not energized.
ECM memorizes diag. trouble code 64 if about (a) or (b)
condition is detected once or more, but ECM does not
start O/D OFF indicator light blinking.
· Lock–up solenoid valve
· Harness or connector between
lock–up solenoid valve and ECM
· ECM

WIRING DIAGRAM

Transmission
Lock–up
Solenoid Valve
Y 3    B-R    8
E9 S3
ECM
B+

Q04350