Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 33. AUTOMATIC TRANSMISSION 14. On-board Diagnostics System
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W1860BE.book Page 108 Tuesday, January 28, 2003 11:01 PM
ON-BOARD DIAGNOSTICS SYSTEM
AUTOMATIC TRANSMISSION
14.On-board Diagnostics System
A: FUNCTION
The on-board diagnostics system detects and stores in the form of a code a fault that has occurred
in any of the following input and output signal systems.
Rear vehicle speed sensor Transfer duty solenoid Low-clutch timing solenoid
Front vehicle speed sensor ATF temperature sensor Torque converter turbine speed sensor
Throttle position sensor Engine speed signal circuit --
Shift solenoid 1 Line pressure duty solenoid --
Shift solenoid 2 AT load signal circuit --
2-4 brake timing solenoid Torque control signal circuit --
Lockup duty solenoid 2-4 brake duty solenoid --
If a fault has been detected, the system tells the fault by causing the AT OIL TEMP warning light to
operate as follows:
Repeated flashing at 4 Hz frequency ...Errors such as battery trouble
Repeated flashing at 2 Hz frequency ...No faults in the system
Flashing at different intervals and frequencies ...Diagnostic trouble codes of corresponding faults
Continued illumination of light ...Fault in inhibitor switch, idle switch, or wiring
4AT-108
W1860BE.book Page 109 Tuesday, January 28, 2003 11:01 PM
ON-BOARD DIAGNOSTICS SYSTEM
AUTOMATIC TRANSMISSION
B: OPERATION OF AT OIL TEMP WARNING LIGHT
On starting the engine, the AT OIL TEMP warning light illuminates and then goes out as shown in
the Normal diagram below. If any problem exists, the light continues flashing as shown in the Ab-
normal diagram below.
(A)
ON
OFF
(B)
ON
(3)
OFF
(C) (4)
ON
(3)
OFF
(4)
(1) (2)
AT-00437
(A) Ignition switch ON (engine OFF) (1) Engine cranking
(B) Normal (2) Blink
(C) Abnormal (3) 2 seconds
(4) 0.3 seconds
4AT-109
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