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DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
AT-529
[RE5F22A]
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AT
Revision: November 2006 2006 Altima
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
PFP:31940
Description
ECS009FP
●
This malfunction will not be detected while the A/T CHECK indicator lamp is indicating another self-diag-
nosis malfunction.
●
This malfunction is detected when the torque converter clutch does not lock up as instructed by the TCM.
This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such
as control valve sticking, improper solenoid valve operation, malfunctioning oil pump or torque converter
clutch, etc.
On Board Diagnosis Logic
ECS009FQ
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “A/T TCC S/V FNCTN” with CONSULT-II or P0744 without CONSULT-II is
detected when A/T cannot perform lock-up even if electrical circuit is good.
Possible Cause
ECS009FR
●
Shift solenoid valve D
(Off stick.)
●
Pressure control solenoid valve C
(Off stick.)
●
Torque converter clutch
●
Hydraulic control circuit
DTC Confirmation Procedure
ECS009FS
CAUTION:
●
Always drive vehicle at a safe speed.
●
Be careful not to rev engine into the red zone on the tachometer.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Start engine and select “DATA MONITOR” mode for “A/T” with
CONSULT-II.
2. Make sure that ATF temperature is within the range below.
FLUID TEMP: More than 20
°
C (68
°
F)
If out of range, drive the vehicle to warm up the fluid.
3. Accelerate vehicle to more than 100 km/h (62 MPH) and main-
tain the following conditions for at least 12 consecutive seconds.
SLCT LVR POSI: “D” position
GEAR: 5th position
SLIP REV: Less than 100 rpm
ACCELE ANGLE: More than 5 %
LOCK-UP: ON (Refer to
AT-703, "VEHICLE SPEED WHEN
PERFORMING AND RELEASING COMPLETE LOCK-UP - 9J500 MODELS" .)
[Vehicle speed: Constant speed of more than 100 km/h (62 MPH).]
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
4. If DTC is detected, go to AT-531, "Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
BCIA0030E