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EC-554
[QR (WITHOUT EURO-OBD)]
TROUBLE DIAGNOSIS
WORK SUPPORT MODE
Work Item
*: This function is not necessary in the usual service procedure.
SELF-DIAG RESULTS MODE
Self Diagnostic Item
Regarding items of DTC and 1st trip DTC, refer to EC-482, "INDEX FOR DTC" .
Freeze Frame Data and 1st Trip Freeze Frame Data
*: The items are the same as those of 1st trip freeze frame data.
WORK ITEM CONDITION USAGE
FUEL PRESSURE RELEASE
● FUEL PUMP WILL STOP BY TOUCHING “START” DUR-
ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.
When releasing fuel pressure
from fuel line
IDLE AIR VOL LEARN
● THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.
When learning the idle air volume
SELF-LEARNING CONT
● THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.
When clearing the coefficient of
self-learning control value
TARGET IDLE RPM ADJ*
● IDLE CONDITION When setting target idle speed
TARGET IGN TIM ADJ*
● IDLE CONDITION When adjusting target ignition tim-
ing
Freeze frame data
item*
Description
DIAG TROUBLE
CODE
[PXXXX]
● The engine control component part/control system has a trouble code, it is displayed as PXXXX. (Refer to
EC-482, "INDEX FOR DTC" .)
FUEL SYS-B1
● “Fuel injection system status” at the moment a malfunction is detected is displayed.
● One mode in the following is displayed.
“Mode2”: Open loop due to detected system malfunction
“Mode3”: Open loop due to driving conditions (power enrichment, deceleration enleanment)
“Mode4”: Closed loop - using oxygen sensor(s) as feedback for fuel control
“Mode5”: Open loop - has not yet satisfied condition to go to closed loop
COOLANT TEMP [°C]
or [°F]
● The engine coolant temperature at the moment a malfunction is detected is displayed.
L-FUEL TRM-B1 [%]
● “Long-term fuel trim” at the moment a malfunction is detected is displayed.
● The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule
than short-term fuel trim.
S-FUEL TRM-B1 [%]
● “Short-term fuel trim” at the moment a malfunction is detected is displayed.
● The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel
schedule.
ENGINE SPEED
[rpm]
● The engine speed at the moment a malfunction is detected is displayed.
VHCL SPEED [km/h]
or [mph]
● The vehicle speed at the moment a malfunction is detected is displayed.
B/FUEL SCHDL
[msec]
● The base fuel schedule at the moment a malfunction is detected is displayed.
INT/A TEMP SE [°C]
or [°F]
● The intake air temperature at the moment a malfunction is detected is displayed.
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