2009 INFINITI QX56 Factory Service Manual

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Page 1361 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-34
< FUNCTION DIAGNOSIS >[VK56DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
When the RESUME/ACCELERATE
switch is pressed after cancel operation other than pressing MAIN switch
is performed, vehicle s

Page 1362 of 4171

INFINITI QX56 2009 Factory Service Manual
CAN COMMUNICATIONEC-35
< FUNCTION DIAGNOSIS > [VK56DE]
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CAN COMMUNICATION
System DescriptionINFOID:0000000003771309
CAN (Controller Area Network) is a serial communicat

Page 1363 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-36
< FUNCTION DIAGNOSIS >[VK56DE]
COOLING FAN CONTROL
COOLING FAN CONTROL
DescriptionINFOID:0000000003771310
SYSTEM DESCRIPTION
Cooling Fan Control
*1: The ECM determines the start signal status b

Page 1364 of 4171

INFINITI QX56 2009 Factory Service Manual
EVAPORATIVE EMISSION SYSTEMEC-37
< FUNCTION DIAGNOSIS > [VK56DE]
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EVAPORATIVE EMISSION SYSTEM
DescriptionINFOID:0000000003771311
SYSTEM DESCRIPTION
The evaporative emis

Page 1365 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-38
< FUNCTION DIAGNOSIS >[VK56DE]
EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION LINE DRAWING
JMBIA1703GB
Revision: December 20092009 QX56

Page 1366 of 4171

INFINITI QX56 2009 Factory Service Manual
EVAPORATIVE EMISSION SYSTEMEC-39
< FUNCTION DIAGNOSIS > [VK56DE]
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JMBIA1702GB
Revision: December 20092009 QX56

Page 1367 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-40
< FUNCTION DIAGNOSIS >[VK56DE]
INTAKE VALVE TIMING CONTROL
INTAKE VALVE TIMING CONTROL
DescriptionINFOID:0000000003771312
SYSTEM DESCRIPTION
*: This signal is sent to the ECM through CAN commun

Page 1368 of 4171

INFINITI QX56 2009 Factory Service Manual
ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-41
< FUNCTION DIAGNOSIS > [VK56DE]
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
IntroductionINFOID:0000000003771313
The ECM has an on board diag

ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-41
< FUNCTION DIAGNOSIS > [VK56DE]
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
IntroductionINFOID:0000000003771313
The ECM has an on board diagnostic system, which detects
malfunctions related to engine sensors or actua-
tors. The ECM also records various emis sion-related diagnostic information including:
The above information can be checked using procedures listed in the table below.
× : Applicable —: Not applicable
*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected
in two consecutive trips (Two trip detection logic) , or when the ECM enters fail-safe mode. (Refer to EC-453,
"Fail-Safe Chart".)
Two Trip Detection LogicINFOID:0000000003771314
When a malfunction is detected for the first time, 1st tr ip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MIL will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd
trip> The “trip” in the “Two Trip Detection Logic” m eans a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic item s will cause the ECM to light up or blink the MIL,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
× : Applicable —: Not applicable
When there is an open circuit on MIL circuit, the ECM c annot warn the driver by lighting up MIL when there is
malfunction on engine control system.
Emission-related diagnostic information Diagnostic service
Diagnostic Trouble Code (DTC) Service $03 of SAE J1979
Freeze Frame data Service $02 of SAE J1979
System Readiness Test (SRT) code Service $01 of SAE J1979
1st Trip Diagnostic Trou ble Code (1st Trip DTC) Service $07 of SAE J1979
1st Trip Freeze Frame data
Test values and Test limi ts Service $06 of SAE J1979
Calibration ID Servic e $09 of SAE J1979
DTC 1st trip DTCFreeze
Frame data 1st trip Freeze
Frame data SRT code SRT status Test value
CONSULT-III ×× × × × × —
GST ×× × —×××
ECM ××*— — — ×—
Items MIL DTC 1st trip DTC
1st trip 2nd trip 1st trip
displaying 2nd trip
displaying 1st trip
displaying 2nd trip
display- ing
Blinking Lighting
up Blinking Lighting
up
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0308 is
being detected ×
———— — ×—
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0308 is
being detected ——
×—— ×——
One trip detection diagnoses (Re-
fer to EC-456, "DTC Index"
.) —
×—— ×———
Except above — — — ×— ×× —
Revision: December 20092009 QX56

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