2001 NISSAN X-TRAIL Service Repair Manual

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Page 409 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-59
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MI Flashing without DTC
If the ECM is in Diagnostic Test Mode II, MI may flash when engine is running. In this ca

Page 410 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-60
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).
How to Set Diagnostic Test Mode II (Heated Oxygen Sensor 1 Monitor)
1

Page 411 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-61
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codes can be identified by using the CONSULT-II or GST. A DTC will be used as an example for how to read a
code.

ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-61
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codes can be identified by using the CONSULT-II or GST. A DTC will be used as an example for how to read a
code.
A particular trouble code can be identified by the number of four-digit numeral flashes. The “zero” is indicated
by the number of ten flashes. The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds
consisting of an ON (0.6-second) - OFF (0.6-second) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-second OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC “0000” refers to no
malfunction. (See EC-20, "
INDEX FOR DTC" )
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to EC-
59, "HOW TO SWITCH DIAGNOSTIC TEST MODE" .
●If the battery is disconnected, the DTC will be lost from the backup memory after approx 24 hours.
●Be careful not to erase the stored memory before starting trouble diagnoses.
DIAGNOSTIC TEST MODE II — HEATED OXYGEN SENSOR 1 MONITOR
In this mode, the MI displays the condition of the fuel mixture (lean or rich) which is monitored by the heated
oxygen sensor 1.
*: Maintains conditions just before switching to open loop.
To check the heated oxygen sensor 1 function, start engine in the Diagnostic Test Mode II and warm it up until
engine coolant temperature indicator points to the middle of the gauge.
Next run engine at about 2,000 rpm for about 2 minutes under no-load conditions. Then make sure that the MI
comes ON more than 5 times within 10 seconds with engine running at 2,000 rpm under no-load.
OBD System Operation ChartEBS00M0R
RELATIONSHIP BETWEEN MI, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS
●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.
●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 MI will come on. For details, refer to EC-44, "
Two Trip Detection
Logic" .
SEF952W
MI Fuel mixture condition in the exhaust gas Air-fuel ratio feedback control condition
ON Lean
Closed loop system
OFF Rich
*Remains ON or OFF Any condition Open loop system

Page 412 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-62
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
●The MI will go off after the vehicle is driven 3 times with no malfunction. The drive is counted only when
the recorded driving pattern

Page 413 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
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RELATIONSHIP BETWEEN MI, DTC, 1ST TRIP DTC AND DRIVING PATTERNS FOR “MISFIRE”
<EXHAUST QUALITY DETERIORATION

Page 414 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-64
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
EXPLANATION FOR DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY DETERIORA-
TION>”, “FUEL INJECTION SYSTEM”
<Driving Pattern B>
Drivi

Page 415 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-65
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RELATIONSHIP BETWEEN MI, DTC, 1ST TRIP DTC AND DRIVING PATTERNS EXCEPT FOR
“MISFIRE <EXHAUST QUALITY DETERIOR

Page 416 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-66
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
EXPLANATION FOR DRIVING PATTERNS EXCEPT FOR “MISFIRE <EXHAUST QUALITY
DETERIORATION>”, “FUEL INJECTION SYSTEM”
<Driving Pattern A

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