4AT(diag)-71
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK IGNITION POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from rear vehicle
speed sensor.
3) Turn the ignition switch to ON.
4) Measure the ignition power supply voltage
between rear vehicle speed sensor connector
and transmission ground.
Connector & terminal
(AT4) No. 3 (+) — Transmission ground (–):
Is the voltage 10 V or more?
Go to step
2
.
Check harness
between rear vehi-
cle speed sensor
and battery for
open circuit, short
or poor contact.
Repair the harness
if required.
2
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between
TCM connector and rear vehicle speed sensor
connector.
Connector & terminal
(B55) No. 15 — (AT4) No. 1:
(B55) No. 26 — (AT4) No. 2:
Is the resistance less than 1
:
? Go to step
3
.
Repair the open
circuit or poor con-
tact of the connec-
tor in harness
between TCM and
rear vehicle speed
sensor connector.
3
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 15 — Chassis ground:
(B55) No. 26 — Chassis ground:
Is the resistance 1 M
:
or
more?
Go to step
4
.
Repair the short
circuit of harness
between TCM and
rear vehicle speed
sensor connector.
4
CHECK INPUT SIGNAL FOR TCM.
1) Connect the connectors to TCM and trans-
mission.
2) Lift up the vehicle.
3) Start the engine.
4) Slowly increase the vehicle speed to 20 km/
h (12 MPH).
NOTE:
The speed difference between front and rear
wheels lights the ABS warning light or the VDC
warning light, but this does not indicate a mal-
function. If the warning light is illuminated, clear
the memory of ABS or VDC after completing AT
control diagnosis. <Ref. to ABS(diag)-21, Clear
Memory Mode.> <Ref. to VDC(diag)-24, Clear
Memory Mode.>
5) Measure the AC voltage between TCM con-
nector terminals.
Connector & terminal
(B55) No. 26 (+) — No. 15 (–):
Is the voltage approx. 2 V or
more?
Go to step
5
.
Replace the rear
vehicle speed sen-
sor.
5
CHECK POOR CONTACT.
Is there poor contact of rear
vehicle speed sensor circuit?
Repair the poor
contact.
Replace the TCM.
<Ref. to 4AT-63,
Transmission Con-
trol Module
(TCM).>
Содержание 2009 IMPREZA
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