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On Board Diagnostic System Function
=NHEC0032S01
The on board diagnostic system has the following two functions.
Diagnostic Test
Mode
KEY and ENG.
Status
Function Explanation of Function
Mode I Ignition switch in
“ON” position
Engine stopped
BULB CHECK This function checks the MIL bulb for damage (blown,
open circuit, etc.).
If the MIL does not come on, check MIL circuit.
Engine running
MALFUNCTION
WARNING
This is a usual driving condition. When a malfunction is
detected twice in two consecutive driving cycles (two trip
detection logic), the MIL will light up to inform the driver
that a malfunction has been detected.
The following malfunctions will light up or blink the MIL in
the 1st trip.
I Coolant overtemperature enrichment protection
I “Misfire (Possible three way catalyst damage)”
I “Closed loop control”
I Fail-safe mode
Diagnostic Test Mode I — Bulb Check
NHEC0032S03
In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to
EL-167, “WARNING LAMPS” or see EC-643.
Diagnostic Test Mode I — Malfunction Warning
NHEC0032S04
MIL Condition
ON When the malfunction is detected or the ECM’s CPU is malfunctioning.
OFF No malfunction.
OBD System Operation Chart
NHEC0033
RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS
NHEC0033S01
I When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are
stored in the ECM memory.
I When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are
stored in the ECM memory, and the MIL will come on. For details, refer to “Two Trip Detection Logic” on
EC-68.
I The MIL will go off after the vehicle is driven 3 times with no malfunction. The drive is counted only when
the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs while counting,
the counter will reset.
I The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A)
without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel
Injection System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driv-
ing pattern C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC RESULTS”
mode of CONSULT-II will count the number of times the vehicle is driven.
I The 1st trip DTC is not displayed when the self-diagnosis results in “OK” for the 2nd trip.
SUMMARY CHART
NHEC0033S02
Items Fuel Injection System Misfire Other
MIL (goes off) 3 (pattern B) 3 (pattern B) 3 (pattern B)
DTC, Freeze Frame Data (no
display)
80 (pattern C) 80 (pattern C) 40 (pattern A)
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Malfunction Indicator Lamp (MIL) (Cont’d)
EC-83
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