2001 INFINITI QX4 Factory Service Manual

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Page 609 of 2395

INFINITI QX4 2001 Factory Service Manual Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but
all of the data listed above, are cleared from the ECM memory during work procedures.
IVIS (INF

Page 610 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic Test
ModeKEY and ENG.
StatusFunction Explanation of Function
Mode I Ignition switch in
ªONº position
Engine stopped
BULB CHECK This function checks the MIL bulb for damage (blown,
open ci

Diagnostic Test
ModeKEY and ENG.
StatusFunction Explanation of Function
Mode I Ignition switch in
ªONº 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
WARNINGThis 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.
ICoolant overtemperature enrichment protection
IªMisfire (Possible three way catalyst damage)º
IªClosed loop controlº
IFail-safe mode
Diagnostic Test Mode I Ð Bulb CheckNBEC0032S03In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to
EL-114, ªWARNING LAMPSº or see EC-648.
Diagnostic Test Mode I Ð Malfunction WarningNBEC0032S04
MIL Condition
ON When the malfunction is detected or the ECM's CPU is malfunctioning.
OFF No malfunction.
OBD System Operation ChartNBEC0033RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMSNBEC0033S01IWhen 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.
IWhen 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 ªTwo Trip Detection Logicº on
EC-59.
IThe 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.
IThe 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 ªTIMEº in ªSELF-DIAGNOSTIC RESULTSº
mode of CONSULT-II will count the number of times the vehicle is driven.
IThe 1st trip DTC is not displayed when the self-diagnosis results in ªOKº for the 2nd trip.
SUMMARY CHARTNBEC0033S02
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)
1st Trip DTC (clear) 1 (pattern C), *1 1 (pattern C), *1 1 (pattern B)
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Malfunction Indicator Lamp (MIL) (Cont'd)
EC-75

Page 611 of 2395

INFINITI QX4 2001 Factory Service Manual Items Fuel Injection System Misfire Other
1st Trip Freeze Frame Data
(clear)*1, *2 *1, *2 1 (pattern B)
For details about patterns ªBº and ªCº under ªFuel Injection Systemº and ªMisfireº, see

Page 612 of 2395

INFINITI QX4 2001 Factory Service Manual RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS FOR
ªMISFIREº <EXHAUST QUALITY DETERIORATION>, ªFUEL INJECTION SYSTEMº
=NBEC0033S03
SEF392S
*1: When the same malfunction is
detect

Page 613 of 2395

INFINITI QX4 2001 Factory Service Manual EXPLANATION FOR DRIVING PATTERNS FOR ªMISFIRE <EXHAUST QUALITY
DETERIORATION>º, ªFUEL INJECTION SYSTEMº
NBEC0033S04<Driving Pattern B>NBEC0033S0401Driving pattern B means the vehicle operation as

Page 614 of 2395

INFINITI QX4 2001 Factory Service Manual RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS EXCEPT
FOR ªMISFIRE <EXHAUST QUALITY DETERIORATION>º, ªFUEL INJECTION SYSTEMºNBEC0033S05
SEF393S
*1: When the same malfunction is
d

Page 615 of 2395

INFINITI QX4 2001 Factory Service Manual EXPLANATION FOR DRIVING PATTERNS EXCEPTFOR ªMISFIRE <EXHAUST QUALITY
DETERIORATION>º, ªFUEL INJECTION SYSTEMº
NBEC0033S06<Driving Pattern A>NBEC0033S0601
AEC574
IThe A counter will be cleared when

Page 616 of 2395

INFINITI QX4 2001 Factory Service Manual SEF941Y
CONSULT-II=NBEC0034CONSULT-II INSPECTION PROCEDURENBEC0034S011. Turn ignition switch OFF.
2. Connect CONSULT-II to data link connector, which is located
under LH dash panel near the fuse box c

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