Subaru Impreza 2003, Service Manual

Page: 1685 / 3610

4AT-15
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
TRANSMISSION CONTROL MODULE (TCM) I/O SIGNAL
Shift solenoid 2 B54 5
1st or 2nd gear More than 9
10 — 16
3rd or 4th gear Less than 1
Line pressure duty solenoid B54 9
Ignition switch ON (with
engine OFF)
Throttle fully closed after
warm-up.
1.5 — 4.0
2.0 — 4.5
Ignition switch ON (with
engine OFF)
Throttle fully open after
warm-up.
Less than 0.5
Lock-up duty solenoid B54 7
When lock up occurs. More than 8.5
10 — 17
When lock up is released. Less than 0.5
Transfer duty solenoid
(SOHC model)
B54 6
Fuse on FWD switch More than 8.5
10 — 17
Fuse removed from FWD
switch (with throttle fully
open and with select lever
in 1st gear).
Less than 0.5
Transfer duty solenoid
(DOHC turbo model)
B56 6
Throttle fully closed. More than 8.5
10 — 17
Throttle fully open. Less than 0.5
2-4 brake duty solenoid B54 18
Throttle fully closed (with
engine OFF) after warm-
up.
1.5 — 5.0
2.0 — 4.5
Throttle fully open (with
engine OFF) after warm-
up.
Less than 0.5
2-4 brake timing solenoid B54 16
1st gear Less than 1
10 — 16
3rd gear More than 9
Low clutch timing solenoid B54 15
2nd gear Less than 1
10 — 16
4th gear More than 9
HOLD switch B55 16
HOLD switch ON Less than 1 —
HOLD switch OFF More than 8 —
POWER switch B55 23
POWER switch ON Less than 1 —
POWER switch OFF More than 10 —
POWER indicator light B56 11
Light ON Less than 1 —
Light OFF More than 9 —
FWD switch B55 20
Fuse removed. 6 — 9.1 —
Fuse installed. Less than 1 —
FWD indicator light B56 2
Fused ON FWD switch Less than 1 —
Fuse removed from FWD
switch.
More than 9 —
ABS signal B55 21
ABS switch ON Less than 1 —
ABS switch OFF 6.5 — 15 —
Sensor ground line 1 B54 20 — 0 Less than 1
Sensor ground line 2 B55 9 — 0 Less than 1
System ground line
B56 19
— 0 Less than 1
B54 21
Sensor ground line 3 B54 10 — 0 Less than 1
Sensor ground line 4 B54 19 — 0 Less than 1
AT diagnosis signal B56 21 Ignition switch ON
Less than 1
←
→
More than 4
—
Check with ignition switch ON.
Content
Connector
No.
Terminal No. Measuring conditions Voltage (V)
Resistance
to body
(ohms)