Infiniti QX4 (R50). Manual — part 149
SRT Set Timing
=NBEC0031S0311
SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is done
regardless of whether the result is OK or NG. The set timing is different between OK and NG results and is
shown in the table below.
Self-diagnosis result
Example
Diagnosis
Ignition cycle
+
ON
,
OFF
+
ON
,
OFF
+
ON
,
OFF
+
ON
,
All OK
Case 1
P0400
OK (1)
— (1)
OK (2)
— (2)
P0402
OK (1)
— (1)
— (1)
OK (2)
P1402
OK (1)
OK (2)
— (2)
— (2)
SRT of EGR
“CMPLT”
“CMPLT”
“CMPLT”
“CMPLT”
Case 2
P0400
OK (1)
— (1)
— (1)
— (1)
P0402
— (0)
— (0)
OK (1)
— (1)
P1402
OK (1)
OK (2)
— (2)
— (2)
SRT of EGR
“INCMP”
“INCMP”
“CMPLT”
“CMPLT”
NG exists
Case 3
P0400
OK
OK
—
—
P0402
—
—
—
—
P1402
NG
—
NG
NG
(Consecutive NG)
(1st trip)
DTC
1st trip DTC
—
1st trip DTC
DTC
(= MIL “ON”)
SRT of EGR
“INCMP”
“INCMP”
“INCMP”
“CMPLT”
OK: Self-diagnosis is carried out and the result is OK.
NG: Self-diagnosis is carried out and the result is NG.
—: Self-diagnosis is not carried out.
When all SRT related self-diagnoses showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT
will indicate “CMPLT”.
,
Case 1 above
When all SRT related self-diagnoses showed OK results through several different cycles, the SRT will indi-
cate “CMPLT” at the time the respective self-diagnoses have at least one OK result.
,
Case 2 above
If one or more SRT related self-diagnoses showed NG results in 2 consecutive cycles, the SRT will also indi-
cate “CMPLT”.
,
Case 3 above
The table above shows that the minimum number of cycles for setting SRT as “INCMP” is one (1) for each
self-diagnosis (Case 1 & 2) or two (2) for one of self-diagnoses (Case 3). However, in preparation for the state
emissions inspection, it is unnecessary of each self-diagnosis to be executed twice (Case 3) for the following
reasons:
I
The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.
I
The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis results.
I
When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to “CMPLT” of SRT, the self-diag-
nosis memory must be erased from ECM after repair.
I
If the 1st trip DTC is erased, all the SRT will indicate “INCMP”.
NOTE:
SRT can be set as “CMPLT” together with the DTC(s). Therefore, DTC check must always be carried out prior
to the state emission inspection even though the SRT indicates “CMPLT”.
SRT Service Procedure
NBEC0031S0312
If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review
the flowchart diagnostic sequence on the next page.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
EC-63
SEF170Z
*1
*2
*3
How to Display SRT Code
NBEC0031S0301
With CONSULT-II
Selecting “SRT STATUS” in “DTC CONFIRMATION” mode with CONSULT-II.
For items whose SRT codes are set, a “CMPLT” is displayed on the CONSULT-II screen; for items whose SRT
codes are not set, “INCMP” is displayed.
With GST
Selecting Mode 1 with GST (Generic Scan Tool)
A sample of CONSULT-II display for SRT code is shown below.
“INCMP” means the self-diagnosis is incomplete and SRT is not set. “CMPLT” means the self-diagnosis is
complete and SRT is set.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
EC-64
SEF949Z
How to Set SRT Code
NBEC0031S0302
To set all SRT codes, self-diagnosis for the items indicated above must be performed one or more times. Each
diagnosis may require a long period of actual driving under various conditions.
With CONSULT-II
Perform corresponding DTC Confirmation Procedure one by one based on “Performance Priority” in the table
on EC-62.
Without CONSULT-II
The most efficient driving pattern in which SRT codes can be properly set is explained on the next page. The
driving pattern should be performed one or more times to set all SRT codes.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
EC-65
Driving Pattern
NBEC0031S0303
SEF947Y
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
EC-66
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