Infiniti FX35, FX50 (S51). Manual — part 792
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-709
< SYSTEM DESCRIPTION >
[VK50VE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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 show OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will
indicate “CMPLT”.
→
Case 1 above
When all SRT related self-diagnoses show OK results through several different cycles, the SRT will indicate
“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 show NG results in 2 consecutive cycles, the SRT will also indicate
“CMPLT”.
→
Case 3 above
The table above shows that the minimum number of cycles for setting SRT as “INCMP” is the number one (1)
for each self-diagnosis (Case 1 & 2) or the number two (2) for one of self-diagnoses (Case 3). However, in
preparation for the state emissions inspection, it is unnecessary for each self-diagnosis to be executed twice
(Case 3) for the following reasons:
• The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.
• The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis results.
• During SRT driving pattern, the 1st trip DTC (NG) is detected prior to “CMPLT” of SRT and the self-diagnosis
memory must be erased from the ECM after repair.
• 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
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”
Self-diagnosis result
Example
Diagnosis
Ignition cycle
←
ON
→
OFF
←
ON
→
OFF
←
ON
→
OFF
←
ON
→
EC-710
< SYSTEM DESCRIPTION >
[VK50VE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review
the flowchart diagnostic sequence below.
How to Display SRT Status
WITH CONSULT-III
Selecting “SRT STATUS” in “DTC CONFIRMATION” mode with CONSULT-III.
For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT-III screen; for items whose SRT
codes are not set, “INCMP” is displayed.
NOTE:
Though displayed on the CONSULT-III screen, “HO2S HTR” is not SRT item.
WITH GST
Selecting Service $01 with GST (Generic Scan Tool)
NO TOOLS
A SRT code itself cannot be displayed, however SRT status can.
1.
Turn ignition switch ON and wait 20 seconds.
2.
SRT status is indicated as shown below.
• When all SRT codes are set, MIL illuminates continuously.
JMBIA1574GB
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-711
< SYSTEM DESCRIPTION >
[VK50VE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
• When any SRT codes are not set, MIL will blink periodically for 10 seconds.
MALFUNCTION INDICATOR LAMP (MIL)
Description
The MIL is located on the combination meter.
1.
The MIL will illuminate when the ignition switch is turned ON
without the engine running. This is a bulb check.
If the MIL does not illuminate, check MIL circuit. Refer to
1120, "Component Function Check"
.
2.
When the engine is started, the MIL should turn off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction.
On Board Diagnostic System Function
The on board diagnostic system has the following three functions.
JMBIA1515GB
SEF217U
EC-712
< SYSTEM DESCRIPTION >
[VK50VE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Diagnostic Test Mode I — Bulb Check
In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check MIL circuit. Refer to
EC-1120, "Component Function Check"
Diagnostic Test Mode I — Malfunction Warning
The DTC number is clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC RESULTS)
Diagnostic Test Mode II — Self-diagnostic Results
In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below.
The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test
mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL
illuminates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are
displayed, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These uniden-
tified codes can be identified by using the CONSULT-III or GST. A DTC will be used as an example for how to
read a code.
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 illuminate, check MIL circuit.
Engine running
MALFUNCTION
WARNING
When a malfunction is detected twice in two consecutive
driving cycles (two trip detection logic), the MIL will illumi-
nate to inform the driver that a malfunction has been detect-
ed.
The following malfunctions will illuminate or blink the MIL in
the 1st trip.
• Misfire (Possible three way catalyst damage)
• One trip detection diagnosis
Mode II
Ignition switch in
ON position
Engine stopped
SELF-DIAGNOSTIC
RESULTS
This function allows DTCs and 1st trip DTCs to be read.
MIL
Condition
ON
When the malfunction is detected.
OFF
No malfunction.
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