Nissan Qashqai J11. Manual — part 722
ON BOARD DIAGNOSTIC (OBD) SYSTEM
TM-463
< SYSTEM DESCRIPTION >
[CVT: RE0F10G]
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
Description
INFOID:0000000010245556
This is an on board diagnosis system which records diagnosis information related to the exhaust gases. It
detects malfunctions related to sensors and actuators. The malfunctions are indicated by means of the mal-
function indicator lamp (MIL) and are stored as DTC in the ECU memory. The diagnosis information can be
checked using a diagnosis tool (GST: Generic Scan Tool).
Function of OBD
INFOID:0000000010245557
The GST is connected to the diagnosis connector on the vehicle and communicates with the on-board control
units to perform diagnosis. The diagnosis connector is the same as for CONSULT. Refer to
.
TM-464
< SYSTEM DESCRIPTION >
[CVT: RE0F10G]
DIAGNOSIS SYSTEM (TCM)
DIAGNOSIS SYSTEM (TCM)
DIAGNOSIS DESCRIPTION
DIAGNOSIS DESCRIPTION : 1 Trip Detection Diagnosis and 2 Trip Detection Diagno-
sis
INFOID:0000000010245558
NOTE:
“Start the engine and turn OFF the ignition switch after warm-up.” This is defined as 1 trip.
1 TRIP DETECTION DIAGNOSIS
When initial malfunction is detected, TCM memorizes DTC. In these diagnoses, some illuminate MIL and
some do not. Refer to
2 TRIP DETECTION DIAGNOSIS
When initial malfunction is detected, TCM memorizes DTC of the 1st trip. MIL does not light at this stage. <1
trip>
If the same malfunction is detected again in next driving, TCM memorizes DTC. When DTC is memorized, MIL
lights. <2 trip>
“Trip” of the “2 trip detection diagnosis” indicates the driving mode that executes self-diagnosis during driving.
×
: Check possible
—: Check not possible
DIAGNOSIS DESCRIPTION : DTC and DTC of 1st Trip
INFOID:0000000010245559
2 TRIP DETECTION DIAGNOSIS THAT ILLUMINATES MIL
• The DTC number of the 1st trip is the same as the DTC number.
• When a malfunction is detected at the 1st trip, TCM memorizes DTC of the 1st trip. MIL does not light at this
stage. If the same malfunction is not detected at the 2nd trip (conforming to necessary driving conditions),
DTC at the 1st trip is erased from TCM. If the same malfunction is detected at the 2nd trip, TCM memorizes
DTC and MIL lights at the same time.
• The DTC of the 1st trip is specified in Service $01 of SAE J1979/ISO 15031-5. Since detection of DTC at the
1st trip does not illuminate MIL, warning for a problem is not given to a driver.
• For procedure to delete DTC and 1st trip DTC from TCM, refer to
• If DTC of the 1st trip is detected, it is necessary to check the cause according to the “Diagnosis flow”. Refer
.
DIAGNOSIS DESCRIPTION : Malfunction Indicator Lamp (MIL)
INFOID:0000000010245560
• TCM not only detects DTC, but also sends the MIL signal to ECM through CAN communication. ECM sends
the MIL signal to the combination meter through CAN communication according to the signal, and illumi-
nates MIL.
• For malfunction indicator lamp (MIL) description, refer to
EC9-23, "Malfunction Indicator Lamp"
DIAGNOSIS DESCRIPTION : Counter System
INFOID:0000000010245561
RELATION BETWEEN DTC AT 1ST TRIP/DTC/MIL AND DRIVING CONDITIONS (FOR 2 TRIP DE-
TECTION DIAGNOSIS THAT ILLUMINATES MIL)
• When initial malfunction is detected, TCM memorizes DTC of the 1st trip. MIL does not light at this stage.
• If the same malfunction is detected at the 2nd trip, TCM memorizes DTC and MIL lights at the same time.
• Then, MIL goes after driving the vehicle for 3 trips under “Driving condition B” without malfunction.
• DTC is displayed until 40 trips of “Driving condition A” are satisfied without detecting the same malfunction.
DTC is erased when 40 trips are satisfied.
Item
DTC at the 1st trip
DTC
MIL
Display at the
1st trip
Display at the
2nd trip
Display at the
1st trip
Display at the
2nd trip
Illumination at
the 1st trip
Illumination at
the 2nd trip
1 trip detection diagnosis
(Refer to
)
—
—
×
—
×
—
2 trip detection diagnosis
(Refer to
)
×
—
—
×
—
×
DIAGNOSIS SYSTEM (TCM)
TM-465
< SYSTEM DESCRIPTION >
[CVT: RE0F10G]
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• When the self-diagnosis result is acceptable at the 2nd trip (conforming to driving condition B), DTC of the
1st trip is erased.
COUNTER SYSTEM LIST
DRIVING CONDITION
Driving condition A
Driving condition A is the driving condition that provides warm-up.
In specific, count-up is performed when all of the following conditions are satisfied.
• Engine speed is 400 rpm or more.
• After start of the engine, the water temperature increased by 20
°
C (36
°
F) or more.
• Water temperature was 70
°
C (158
°
F) or more.
• The ignition switch was changed from ON to OFF.
NOTE:
• If the same malfunction is detected regardless of the driving condition, reset the A counter.
• When the above is satisfied without detecting the same malfunction, count up the A counter.
• When MIL goes off due to the malfunction and the A counter reaches 40, the DTC is erased.
Driving condition B
Driving condition B is the driving condition that performs all diagnoses once.
In specific, count-up is performed when all of the following conditions are satisfied.
• Engine speed is 400 rpm or more.
• Water temperature was 70
°
C (158
°
F) or more.
• In closed loop control, vehicle speed of 70 – 120 km/h (43 – 75 MPH) continued for 60 seconds or more.
• In closed loop control, vehicle speed of 30 – 60 km/h (19 – 37 MPH) continued for 10 seconds or more.
• In closed loop control, vehicle speed of 4 km/h (2 MPH) or less and idle determination ON continued for 12
seconds or more.
• After start of the engine, 22 minutes or more have passed.
• The condition that the vehicle speed is 10 km/h (6 MPH) or more continued for 10 seconds or more in total.
• The ignition switch was changed from ON to OFF.
NOTE:
• If the same malfunction is detected regardless of the driving condition, reset the B counter.
• When the above is satisfied without detecting the same malfunction, count up the B counter.
• When the B counter reaches 3 without malfunction, MIL goes off.
• When the B counter is counted once without detecting the same malfunction after TCM memorizes DTC of
the 1st trip, DTC of the 1st trip is erased.
Item
Driving condition
Trip
MIL (OFF)
B
3
DTC (clear)
A
40
DTC at 1st trip (clear)
B
1
TM-466
< SYSTEM DESCRIPTION >
[CVT: RE0F10G]
DIAGNOSIS SYSTEM (TCM)
TIME CHART
CONSULT Function
INFOID:0000000010245562
APPLICABLE ITEM
JSDIA1868GB
Conditions
Function
Work Support
The settings for ECU functions can be changed.
Self Diagnostic Results
The ECU self diagnostic results are displayed.
Data Monitor
The ECU input/output data is displayed in real time.
CAN Diagnosis Support Monitor
The result of transmit/receive diagnosis of CAN communication is displayed.
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