Subaru Impreza 2003 Service Manual page 630

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
BM: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)-46, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-39, OPERATION, Inspec-
tion Mode.>.
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK THROTTLE POSITION SENSOR
CIRCUIT.
Check throttle position sensor circuit. <Ref. to
4AT-48, DTC 31 THROTTLE POSITION SEN-
SOR, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
3 CHECK FRONT VEHICLE SPEED SENSOR
CIRCUIT.
Check front vehicle speed sensor circuit. <Ref.
to 4AT-53, DTC 33 FRONT VEHICLE SPEED
SENSOR, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>
4 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR CIRCUIT.
Check torque converter turbine speed sensor
circuit. <Ref. to 4AT-57, DTC 36 TORQUE
CONVERTER TURBINE SPEED SENSOR,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
5 CHECK POOR CONTACT.
Check poor contact in TCM connector.
6 CHECK MECHANICAL TROUBLE.
Check mechanical trouble in automatic trans-
mission.
Check
Is any other DTC displayed?
Is there any trouble in throttle
position sensor circuit?
Is there any trouble in front
vehicle speed sensor circuit?
Is there any trouble in torque
converter turbine speed sensor
circuit?
Is there poor contact in TCM
connector?
Is there any mechanical trou-
ble in automatic transmission?
EN(H4SO)-218
Yes
Inspect relevant Go to step 2.
DTC using "List of
Diagnostic Trou-
ble Code (DTC)".
<Ref. to
EN(H4SO)-73, List
of Diagnostic
Trouble Code
(DTC).>
Repair or replace Go to step 3.
the throttle posi-
tion sensor circuit.
Repair or replace Go to step 4.
the front vehicle
speed sensor cir-
cuit.
Repair or replace Go to step 5.
the torque con-
verter turbine
speed sensor cir-
cuit.
Repair poor con- Go to step 6.
tact in TCM con-
nector.
Repair or replace Replace the TCM.
the automatic <Ref. to 4AT-70,
transmission. Transmission Con-
<Ref. to 4AT-33, trol Module
INSPECTION, (TCM).>
Road Test.>
No