Subaru 2009 IMPREZA Service Manual page 2037

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
M: DTC P0741 TORQUE CONVERTER CLUTCH CIRCUIT PERFORMANCE OR
STUCK OFF
DTC DETECTING CONDITION:
• Lock up clutch malfunction
• Sticky valve
TROUBLE SYMPTOM:
No lock-up occurs.
Step
1 CHECK ENGINE SPEED SIGNAL.
1) Idle the engine.
2) Read the data of "Engine Speed" using Sub-
aru Select Monitor.
2 CHECK AT TURBINE REVOLUTION SPEED
SENSOR CIRCUIT.
Perform the diagnosis according to DTC P0715.
<Ref. to 4AT(diag)-42, DTC P0715 INPUT/
TURBINE SPEED SENSOR CIRCUIT, Diag-
nostic Procedure with Diagnostic Trouble Code
(DTC).>
3 CHECK AT VEHICLE SPEED SENSOR CIR-
CUIT.
Perform the diagnosis according to DTC P0720.
<Ref. to 4AT(diag)-47, DTC P0720 OUTPUT
SPEED SENSOR CIRCUIT, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
Check
Does the value of "Engine
Speed" almost match the value
of the tachometer located in the
combination meter?
Is there any trouble?
Is there any trouble?
4AT(diag)-52
Yes No
Go to step 2. Check the engine
speed signal cir-
cuit.
Check the torque Go to step 3.
converter turbine
speed sensor cir-
cuit.
Check the harness There are malfunc-
of the front vehicle tions in TCM, TCM
speed sensor cir- connector poor
cuit, and repair the contact, or trans-
defective part. mission assembly
mechanical mal-
function.