Nissan Primera P12. Manual — part 213
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-37
[YD (WITH EURO-OBD)]
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A
EC
OBD System Operation Chart
EBS013JI
RELATIONSHIP BETWEEN MI, 1ST/2ND TRIP DTC, DTC, AND DETECTABLE ITEMS
●
When the malfunction is detected for the first time, 1st trip DTC is stored in the ECM memory.
●
When the same malfunction is detected during 2nd consecutive trip, 2nd trip DTC is stored and 1st trip
DTC is cleared.
●
When the same malfunction is detected during 3rd consecutive trip, DTC and Freeze Frame Data are
stored and MI illuminates. Refer to
EC-31, "Three Trip Detection Logic and One Trip Detection Logic"
for
details.1st/2nd trip DTC are cleared from the ECM memory.
●
MI will go off after the vehicle is driven 3 consecutive times with no malfunction (driving pattern A).
●
1st/2nd trip DTC, DTC, and Freeze Frame Data will be stored until the vehicle is driven 41 times (driving
pattern B) without the same malfunction recurring. “TIME” data displayed in the “SELF-DIAG RESULTS”
mode of CONSULT-II shows the number of times the vehicle is driven without the same malfunction recur-
ring.
SUMMARY CHART
Refer to
for details of pattern A and B.
Items
Trip
Counter
Driving Pattern
MI (goes off)
3
2
A
DTC, Freeze Frame Data (clear)
41
40
B
1st/2nd Trip DTC (clear)
41
40
B
EC-38
[YD (WITH EURO-OBD)]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
RELATIONSHIP BETWEEN MI, DTC, 1ST/ 2NDTRIP DTC AND DRIVING PATTERNS
*1: CONSULT-II displays for DTC and
1st/2nd trip DTC become the same.
*2: 1st/2nd trip DTC becomes the same
display in mode7 of GST.
*3: When the same malfunction is
detected in three consecutive trips,
MI will light up.
*4: MI will go off after vehicle is driven 3
times (pattern A) without any mal-
functions.
*5: When the malfunction is detected for
the first time, 1st trip DTC is stored in
the ECM memory.
*6: When the same malfunction is
detected during 2nd consecutive trip,
2nd trip DTC is stored and 1st trip
DTC is cleared.
*7: When the same malfunction is
detected during 3rd consecutive trip,
DTC and Freeze Frame Data are
stored.
*8: The DTC and the freeze frame data
will not be displayed any longer after
vehicle is driven 41 times (pattern B)
without the same malfunction.
PBIB2048E
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-39
[YD (WITH EURO-OBD)]
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<Driving Pattern A>
Driving pattern A means the vehicle operation as follows:
Engine speed should go over 500 rpm at least 5 seconds and the DTC Confirmation Procedure is performed.
●
The A counter will be cleared when the same malfunction is detected.
●
The A counter will be counted up when the same malfunction is not detected.
●
The MI will go off when the A counter reaches 3.
<Driving Pattern B>
Driving pattern B means the vehicle operation as follows:
Driving pattern A and (1)-(3) are satisfied.
●
The B counter will be cleared when the same malfunction is detected.
●
The B counter will be counted up when the same malfunction is not detected.
●
The DTC will not be displayed after the B counter reaches 40.
PBIB2049E
EC-40
[YD (WITH EURO-OBD)]
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
PFP:00004
Trouble Diagnosis Introduction
EBS013JJ
INTRODUCTION
The engine has an ECM to control major systems such as fuel injec-
tion control, fuel injection timing control, glow control system, etc.
The ECM accepts input signals from sensors and instantly actuators.
It is essential that both input and output signals are proper and sta-
ble. At the same time, it is important that there are no malfunctions
such as vacuum leaks, or other malfunctions with the engine.
It is much more difficult to diagnose a malfunction that occurs inter-
mittently rather than continuously. Most intermittent malfunctions are
caused by poor electric connections or improper wiring. In this case,
careful checking of suspected circuits may help prevent the replace-
ment of good parts.
A visual check only may not find the cause of the incidents. A road
test with CONSULT-II or a circuit tester connected should be per-
formed. Follow the
.
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such incidents, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A Diagnostic Worksheet like the example
on next page should be used.
Start your diagnosis by looking for conventional incidents first. This
will help troubleshoot driveability incidents on an electronically con-
trolled engine vehicle.
MEF036D
SEF233G
SEF234G
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