Subaru Legacy 2003 Service Manual page 647

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
BJ:DTC P0734 — GEAR 4 INCORRECT RATIO —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Shift point too high or too low; engine brake not effected in "3" range; excessive shift shock; excessive
tight corner "braking"
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
1 CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
2 CHECK THROTTLE POSITION SENSOR
CIRCUIT.
Check throttle position sensor circuit.
Is there any trouble in throttle position sensor
circuit?
<Ref. to AT-52, DTC 31 THROTTLE POSI-
TION SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
3 CHECK FRONT VEHICLE SPEED SENSOR
CIRCUIT.
Check front vehicle speed sensor circuit.
Is there any trouble in vehicle speed sensor 2
circuit?
<Ref. to AT-58, DTC 33 FRONT VEHICLE
SPEED SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
4 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR CIRCUIT.
Check torque converter turbine speed sensor
circuit.
Is there any trouble in torque converter turbine
speed sensor circuit?
<Ref. to AT-64, DTC 36 TORQUE CON-
VERTER TURBINE SPEED SENSOR, Diag-
nostic Procedure with Diagnostic Trouble
Code (DTC).>
5 CHECK POOR CONTACT.
Check poor contact in TCM connector.
Is there poor contact in TCM connector?
6 CHECK MECHANICAL TROUBLE.
Check mechanical trouble in automatic trans-
mission.
Is there any mechanical trouble in automatic
transmission?
Step
EN(H4SO)-250
Value
DTC indicated.
There is a fault.
There is a fault.
There is a fault.
There is poor contact.
There is mechanical trouble.
Yes
Inspect relevant Go to step 2.
DTC using "List of
Diagnostic Trou-
ble Code (DTC)".
<Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>
Repair or replace Go to step 3.
throttle position
sensor circuit.
Repair or replace Go to step 4.
vehicle speed sen-
sor 2 circuit.
Repair or replace Go to step 5.
torque converter
turbine speed sen-
sor circuit.
Repair poor con- Go to step 6.
tact in TCM con-
nector.
Repair or replace Replace TCM.
automatic trans- <Ref. to AT-76,
mission. <Ref. to Transmission Con-
AT-32, INSPEC- trol Module
TION, Road Test.> (TCM).>
No