Subaru Legacy III (2000-2003 year). Service manual — part 606
AT-158
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
L: CHECK BUZZER.
DIAGNOSIS:
Buzzer output signal circuit is open or shorted.
TROUBLE SYMPTOM:
Buzzer remains sounded.
WIRING DIAGRAM:
AT-00792
BATTERY
No.
5
IGNITION
RELA
Y
i12
i1
B36
B56
COMBINATION
METER
TCM
E
13
12
21
B36
B4 B5 B6
A4 A5 A6
C5 C6
F6
D4 D5 D6
F1
H1
C4
G6
G1
C2
K1
M1 M2
K6
L1
D1 D2
A1 A2
B1 B2
I6
J6
L2
I1
J1
H6
M4 M5 M6
L4 L5 L6
N5 N6
O4 O5 O6
N4
P4 P5
N2
O1 O2
P1 P2
N3
O3
P3
P6
A3
B3
C3
E4 E5 E6
E1 E2
E5
BUZZER
B56
1 2
7
8
9
5 6
3 4
10 11 12
19 20 21
13
14 15
16
17
18
22
23
24
i12
1 2 3 4
5 6 7 8
9 10 11 12 13
14 15 16 17 18
AT-159
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK HARNESS BETWEEN TCM AND
COMBINATION METER.
1) Turn ignition switch to OFF.
2) Disconnect connector from combination
meter and TCM.
3) Measure resistance between TCM connec-
tor and chassis ground.
Connector & terminal
(B56) No. 21 — Chassis ground:
Does the measured value exceed the spec-
ified value?
1 M
Ω
Repair short circuit
in harness
between TCM and
combination meter
connector.
2
CHECK COMBINATION METER.
1) Connect connector to combination meter.
2) Turn ignition switch to ON. (Engine is
stopped.)
Does buzzer sound?
Buzzer sounds.
Replace combina-
tion meter.
3
CHECK POOR CONTACT.
Is there poor contact in buzzer circuit?
There is poor contact.
Repair poor con-
tact.
Replace TCM.
AT-160
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
SYMPTOM RELATED DIAGNOSTIC
16.Symptom Related Diagnostic
A: INSPECTION
Symptom
Problem parts
Starter does not rotate when select lever is in “P” or “N”; starter
rotates when select lever is in “R”, “D”, “3” or “2”.
• Inhibitor switch
• Select cable
• Select lever
• Starter motor and harness
Abnormal noise when select lever is in “P” or “N”.
• Strainer
• Transfer duty solenoid
• Oil pump
• Drive plate
• ATF level too high or too low
Hissing noise occurs during standing start.
• Strainer
• ATF level too high or too low
Noise occurs while driving in “D1”.
• Final gear
• Planetary gear
• Reduction gear
• Differential gear oil level too high or too low
Noise occurs while driving in “D2”.
Noise occurs while driving in “D3”.
• Final gear
• Low & reverse brake
• Reduction gear
• Differential gear oil level too high or too low
Noise occurs while driving in “D4”.
• Final gear
• Low & reverse brake
• Planetary gear
• Reduction gear
• Differential gear oil level too high or too low
Engine stalls while shifting from one range to another.
• Control valve
• Lock-up damper
• Engine performance
• Input shaft
Vehicle moves when select lever is in “N”.
• TCM
• Low clutch
Shock occurs when select lever is moved from “N” to “D”.
• TCM
• Harness
• Control valve
• ATF deterioration
Excessive time lag occurs when select lever is moved from “N”
to “D”.
• Control valve
• Low clutch
• Line pressure duty solenoid
• Seal ring
• Front gasket transmission case
Shock occurs when select lever is moved from “N” to “R”.
• TCM
• Harness
• Control valve
• ATF deterioration
Excessive time lag occurs when select lever is moved from “N”
to “R”.
• Control valve
• Low & reverse clutch
• Reverse clutch
• Line pressure duty solenoid
• Seal ring
• Front gasket transmission case
Vehicle does not start in any shift range (engine stalls).
• Parking brake mechanism
• Planetary gear
AT-161
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
SYMPTOM RELATED DIAGNOSTIC
Vehicle does not start in any shift range (engine revving up).
• Strainer
• Line pressure duty solenoid
• Control valve
• Drive pinion
• Hypoid gear
• Axle shaft
• Differential gear
• Oil pump
• Input shaft
• Output shaft
• Planetary gear
• Drive plate
• ATF level too low
• Front gasket transmission case
Vehicle does not start in “R” range only (engine revving up).
• Select cable
• Select lever
• Control valve
• Low & reverse clutch
• Reverse clutch
Vehicle does not start in “R” range only (engine stalls).
• Low clutch
• 2-4 brake
• Planetary gear
• Parking brake mechanism
Vehicle does not start in “D”, “3” range only (engine revving up).
• Low clutch
• One-way clutch
Vehicle does not start in “D”, “3” or “2” range only (engine rev-
ving up).
• Low clutch
Vehicle does not start in “D”, “3” or “2” range only (engine
stalls).
• Reverse clutch
Vehicle starts in “R” range only (engine revving up).
• Control valve
Acceleration during standing starts is poor (high stall rpm).
• Control valve
• Low clutch
• Reverse clutch
• ATF level too low
• Front gasket transmission case
• Differential gear oil level too high or too low
Acceleration during standing starts is poor (low stall rpm).
• Oil pump
• Torque converter one-way clutch
• Engine performance
Acceleration is poor when select lever is in “D”, “3” or “2” range
(normal stall rpm).
• TCM
• Control valve
• High clutch
• 2-4 brake
• Planetary gear
Acceleration is poor when select lever is in “R” (normal stall
rpm).
• Control valve
• High clutch
• 2-4 brake
• Planetary gear
No shift occurs from 1st to 2nd gear.
• TCM
• Rear vehicle speed sensor
• Front vehicle speed sensor
• Throttle position sensor
• Shift solenoid 1
• Control valve
• 2-4 brake
No shift occurs from 2nd to 3rd gear.
• TCM
• Control valve
• High clutch
• Shift solenoid 2
Symptom
Problem parts
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