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ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-55
[QR (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
ON BOARD DIAGNOSTIC (OBD) SYSTEM PFP:00028
Introduction BBS0019K
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:
The above information can be checked using procedures listed in the table below.
×: Applicable —: Not applicable
*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator (MI) on the instrument panel lights up when the same malfunction is detected in two
consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-81, "
Fail-
Safe Chart" .)
Two Trip Detection Logic BBS0019L
When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MI will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MI lights up. The MI lights up at the same time when the DTC is stored. <2nd trip>
The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed during
vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MI, and store
DTC and Freeze Frame data, even in the 1st trip, as shown below.
×: Applicable —: Not applicable
When there is an open circuit on MI circuit, the ECM can not warn the driver by lighting up MI when there is
trouble on engine control system.
Emission-related diagnostic information ISO Standard
Diagnostic Trouble Code (DTC) Service $03 of ISO 15031-5
Freeze Frame data Service $02 of ISO 15031-5
System Readiness Test (SRT) code Service $01 of ISO 15031-5
1st Trip Diagnostic Trouble Code (1st Trip DTC) Service $07 of ISO 15031-5
1st Trip Freeze Frame data
Test values and Test limits Service $06 of ISO 15031-5
Calibration ID Service $09 of ISO 15031-5
DTC 1st trip DTC
Freeze Frame
data
1st trip Freeze
Frame data
SRT code Test value
CONSULT-II ×× × × ×—
GST ×× × — ××
ECM ××*— ———
Items
MI DTC 1st trip DTC
1st trip 2nd trip
1st trip
displaying
2nd trip
displaying
1st trip
displaying
2nd trip
displaying
Blinking
Lighting
up
Blinking
Lighting
up
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0304
is being detected
× ————— × —
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0304
is being detected
—— × —— × ——
One trip detection diagnoses
(Refer to EC-21, "
INDEX FOR
DTC" )
— × —— × ———
Except above — — — × — ××—
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