Subaru 2006 Legacy, Руководство пользователя

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EN(H4DOTC)(diag)-6
General Description
ENGINE (DIAGNOSTICS)
13) When performing the diagnosis, start with sim-
ple and easy operations and proceed to more com-
plicated and harder operations. The most important
in performing the diagnosis is to closely find the
problems that users insist on and to discern these
three problems.
14) For the model with ABS, the ABS warning light
may illuminate when performing driving test with
jacked-up or lifted-up condition, but this is not a
system malfunction. The reason for this is the
speed difference between the front and rear
wheels. After diagnosis of engine control system,
perform the ABS memory clear procedure of self-
diagnosis function.
B: INSPECTION
Before performing diagnostics, check the following
item which might affect engine problems.
1. BATTERY
1) Measure the battery voltage and specific gravity
of the electrolyte.
Standard voltage: 12 V
Specific gravity: Above 1.260
2) Check the condition of the main and other fuses,
and harnesses and connectors. Also check for
proper grounding.
2. ENGINE GROUNDING
Make sure the engine ground terminal is properly
connected to engine.
C: NOTE
1. GENERAL DESCRIPTION
• The on-board diagnosis (OBD) system detects
and indicates a fault in various inputs and outputs
of the complex electronic control. Malfunction indi-
cator light in the combination meter indicates oc-
currence of a fault or trouble.
• Further, against such a failure or sensors as may
disable the drive, the fail-safe function is provided
to ensure the minimal driveability.
• The OBD system incorporated with the vehicles
within this type of engine complies with OBD-II reg-
ulations. The OBD system monitors the compo-
nents and the system malfunction listed in “Engine
Section” which affects on emissions.
• When the system decides that a malfunction oc-
curs, malfunction indicator light illuminates. At the
same time of the malfunction indicator light illumi-
nation or blinking, a DTC and a freeze frame en-
gine conditions are stored into on-board computer.
• The OBD system stores freeze frame engine
condition data (engine load, engine coolant tem-
perature, fuel trim, engine speed and vehicle
speed, etc.) into on-board computer first when it
detects a malfunction.
• If the OBD system detects malfunctions such as
the fault of fuel trim or misfire, the OBD system first
stores freeze frame engine conditions about the
fuel trim or misfire.
• When the malfunction does not occur again for
three consecutive driving cycles, malfunction indi-
cator light is turned off, but DTC remains at on-
board computer.
• When troubleshooting the vehicle which com-
plies with OBD-II regulations, connect the Subaru
Select Monitor or general scan tool to the vehicle.
FU-01170
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