2007 INFINITI QX56 ECO mode

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ACS-31
< SERVICE INFORMATION >[ICC]
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1. Go to operation check after asking the customer for symptom information. Refer to ACS-9.
2. Stop the vehicle to start the self-diagnosis.
3. Turn ignition switch OFF.
4. Turn ignition switch ON, and wait 5 seconds. Press ACCEL/RES
switch 5 times, and then press COAST/SET switch 5 times all
within 5 seconds to start self-diagnosis.
CAUTION:
• Do not start the engine.
• Do not press the ICC ON/OFF switch ON.
• When operation above is not completed within the 5 to 10 sec-
ond window, DTC will not be displayed.
• If self-diagnosis mode cannot be started after several
attempts, the ICC unit may be malfunctioning and should be
replaced. Refer to "SELF-DIAGNOSIS BY ICC SYSTEM DIS-
PLAY WILL NOT RUN".
5. When self-diagnosis mode is started, DTCs are shown on set vehicle speed indicator.
CAUTION:
• DTC will disappear after 5 minutes.
• When multiple malfunctions are detected, a maximum of 3 code numbers can be stored; the lat-
est malfunction will be displayed first.
6. Check ACS-34, "
Diagnostic Trouble Code (DTC) Chart" , and repair or replace if necessary.
7. After repair, erase DTC stored in the ICC unit. Refer to "Self-Diagnostic Erasing Method".
8. DTC 55 will be shown.
9. Turn ignition switch OFF to exit the diagnosis.
10. Perform ICC system running test (drive vehicle with ICC system ON), and make sure that ICC warning
lamp does not illuminate.
Self-Diagnostic Erasing Method
1. Stop the vehicle and turn the ignition switch OFF.
2. Turn ignition switch ON and start self-diagnosis.
3. During self-diagnosis mode, press CANCEL switch 5 times, and DISTANCE switch 5 times within a 10
second time period.
CAUTION:
• Switch inputs must be received within a 10 second time period.
• When operation is not completed within 10 seconds start again from step 1.
4. DTC 55 will be shown.
CAUTION:
DTC of an existing malfunction will not be erased.
5. Turn ignition switch OFF to exit the diagnosis.
WKIA1921E
WKIA1922E

ACS-34
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Diagnostic Trouble Code (DTC) ChartINFOID:0000000003533794
×:Applicable
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Vehicle-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake as-
sist (with
preview
function)
11 CONTROL UNIT×××ו ICC unit internal malfunctionACS-36,
"DTC 11
CON-
TROL
UNIT"
12 VDC CONTROL UNIT×××ו VDC malfunction
• Brake booster signal harness is
open or shortedACS-36,
"DTC 12
VDC
CON-
TROL
UNIT"
20 CAN COMM CIRCUIT×××ו ICC unit detected CAN communi-
cation malfunctionACS-37,
"DTC 20
CAN
COMM
CIR-
CUIT"
31 POWER SUPPLY CIR1×××ו ICC unit power supply voltage is
excessively low (less than 8V)ACS-37,
"DTC 31
POWER
SUPPLY
CIR1,
DTC 34
POWER
SUPPLY
CIR2"
34 POWER SUPPLY CIR2×××ו ICC unit power supply voltage is
excessively high.ACS-37,
"DTC 31
POWER
SUPPLY
CIR1,
DTC 34
POWER
SUPPLY
CIR2"
41 VHCL SPEED SE CIRC×××ו Wheel sensor malfunction
• ABS actuator and electric unit
(control unit) malfunction
• A/T vehicle speed sensor mal-
function
•TCM malfunctionACS-38,
"DTC 41
VHCL
SPEED
SE CIRC"
43 VDC/TCS/ABS CIRC×××ו VDC/TCS/ABS system malfunc-
tionACS-38,
"DTC 43
VDC/
TCS/ABS
CIRC"

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-35
< SERVICE INFORMATION >[ICC]
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45 BRAKE SW/ STOP L SW×××ו ICC brake switch or stop lamp
switch harness is open or shorted
• ICC brake switch or stop lamp
switch is stuck to OFF
• ICC brake switch or stop lamp
switch is stuck to ONACS-38,
"DTC 45
BRAKE
SW/
STOP L
SW"
46 OPERATION SW CIRC××ו ICC steering switch harness or
spiral cable is open or shorted
• ICC steering switch malfunctionACS-40,
"DTC 46
OPERA-
TION SW
CIRC"
74 LASER BEAM OFF CNTR×× ×• Laser beam of ICC sensor is off
the aiming pointACS-41,
"DTC 74
LASER
BEAM
OFF CN-
TR"
90 STOP LAMP RLY FIX×× ×• Normally open terminal of stop
lamp relay is stuckACS-41,
"DTC 90
STOP
LAMP
RLY FIX"
92 ECM CIRCUIT×××וECM malfunction
• Accelerator pedal position sensor
malfunction
• ICC unit malfunctionACS-45,
"DTC 92
ECM
CIR-
CUIT"
96 NP RANGE××ו Park/neutral position switch har-
ness is open or shorted
• Park/neutral position switch mal-
function
•TCM malfunctionACS-45, "DTC 96
NP
RANGE"
97 AT CIRCUIT××וTCM malfunctionACS-46, "DTC 97
AT CIR-
CUIT"
98 GEAR POSITION××וTCM malfunction
• A/T turbine revolution sensor mal-
function
• A/T vehicle speed sensor mal-
functionACS-46,
"DTC 98
GEAR
POSI-
TION"
102 LASER STAIN×× ×• ICC sensor body window has
contaminationACS-47, "DTC 102
LASER
STAIN"
103 LASER SENSOR FAIL×× ×• ICC sensor internal malfunctionACS-47,
"DTC 103
LASER
SEN-
SOR
FA I L"
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Veh ic le-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake as-
sist (with
preview
function)

ACS-36
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
NOTE: DTC 55 will display when no malfunction is detected.
DTC 11 CONTROL UNITINFOID:0000000003533795
1.DIAGNOSTIC CHECK
Are any items other than “DTC 11 CONTROL UNIT” indicated on self-diagnosis display?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test" . Then perform self-diagnosis of ICC system again.
NO >> Replace ICC unit. Refer to ACS-55
. Erase DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
DTC 12 VDC CONTROL UNITINFOID:0000000003533796
1.DIAGNOSIS CHECK
With CONSULT-II
Perform self-diagnosis of ABS actuator and electric unit (control unit). Is malfunction indicated?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to ACS-
9, "ICC System Running Test". Then perform self-diagnosis of ICC system again.
NO >> GO TO 2.
2.CHECK CONNECTOR ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
1. Turn ignition switch OFF.
2. Disconnect ICC unit, and ABS actuator and electric unit (control unit) connectors, and connect them
securely again. Erase DTC, then perform self-diagnosis of ICC system again.
OK or NG
OK >> Poor connector connection. Check connector housing for disconnected, loose, bent and collapsed
terminals. If any malfunction is detected, repair as necessary. Erase DTC and perform ICC sys-
tem running test. Refer to ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC
system again.
NG >> GO TO 3.
3.CHECK HARNESS BETWEEN ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
104 LASER AIMING INCMP×× ×• Laser beam aiming of ICC sensor
is not adjustedACS-48,
"DTC 104
LASER
AIMING
INCMP"
107 LASER COMM FAIL×× ×• CAN data received by ICC sensor
is strange (from ICC unit, combi-
nation meter or ECM)ACS-48,
"DTC 107
LASER
COMM
FA IL"
109 LASER HIGH TEMP×× ×• Temperature around ICC sensor
is excessively highACS-48,
"DTC 109
LASER
HIGH
TEMP"
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Vehicle-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake as-
sist (with
preview
function)

ON BOARD DIAGNOSTIC (OBD) SYSTEM
AT-39
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
IntroductionINFOID:0000000003532238
The A/T system has two self-diagnostic systems.
The first is the emission-related on board diagnostic system (OBD-II) performed by the TCM in combination
with the ECM. The malfunction is indicated by the MIL (malfunction indicator lamp) and is stored as a DTC in
the ECM memory but not the TCM memory.
The second is the TCM original self-diagnosis indicated by the A/T CHECK indicator lamp. The malfunction is
stored in the TCM memory. The detected items are overlapped with OBD-II self-diagnostic items. For detail,
refer to AT-83, "
CONSULT-II Function (A/T)".
OBD-II Function for A/T SystemINFOID:0000000003532239
The ECM provides emission-related on board diagnostic (OBD-II) functions for the A/T system. One function
is to receive a signal from the TCM used with OBD-related parts of the A/T system. The signal is sent to the
ECM when a malfunction occurs in the corresponding OBD-related part. The other function is to indicate a
diagnostic result by means of the MIL (malfunction indicator lamp) on the instrument panel. Sensors, switches
and solenoid valves are used as sensing elements.
The MIL automatically illuminates in One or Two Trip Detection Logic when a malfunction is sensed in relation
to A/T system parts.
One or Two Trip Detection Logic of OBD-IIINFOID:0000000003532240
ONE TRIP DETECTION LOGIC
If a malfunction is sensed during the first test drive, the MIL will illuminate and the malfunction will be stored in
the ECM memory as a DTC. The TCM is not provided with such a memory function.
TWO TRIP DETECTION LOGIC
When a malfunction is sensed during the first test drive, it is stored in the ECM memory as a 1st trip DTC
(diagnostic trouble code) or 1st trip freeze frame data. At this point, the MIL will not illuminate. — 1st Trip
If the same malfunction as that experienced during the first test drive is sensed during the second test drive,
the MIL will illuminate. — 2nd Trip
The “Trip” in the “One or Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation.
OBD-II Diagnostic Trouble Code (DTC)INFOID:0000000003532241
HOW TO READ DTC AND 1ST TRIP DTC
DTC and 1st trip DTC can be read by the following methods.
( with CONSULT-II or GST) CONSULT-II or GST (Generic Scan Tool) Examples: P0705, P0720 etc.
These DTC are prescribed by SAE J2012.
(CONSULT-II also displays the malfunctioning component or system.)
•1st trip DTC No. is the same as DTC No.
•Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction. How-
ever, in case of the Mode II and GST, they do not indicate whether the malfunction is still occurring or
occurred in the past and returned to normal.
CONSULT-II can identify them as shown below, therefore, CONSULT-II (if available) is recommended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown
on the next page. DTC or 1st trip DTC of a malfunction is displayed
in SELF-DIAGNOSTIC RESULTS mode for “ENGINE” with CON-
SULT-II. Time data indicates how many times the vehicle was driven
after the last detection of a DTC.
BCIA0030E

ON BOARD DIAGNOSTIC (OBD) SYSTEM
AT-41
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•System readiness test (SRT) codes
•Test values
HOW TO ERASE DTC (WITH CONSULT-II)
•If a DTC is displayed for both ECM and TCM, it is necessary to be erased for both ECM and TCM.
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
10 seconds and then turn it “ON” (engine stopped) again.
2. Turn CONSULT-II “ON” and touch “A/T”.
3. Touch “SELF-DIAG RESULTS”.
4. Touch “ERASE”. (The DTC in the TCM will be erased.) Then touch “BACK” twice.
5. Touch “ENGINE”.
6. Touch “SELF-DIAG RESULTS”.
7. Touch “ERASE”. (The DTC in the ECM will be erased.)
HOW TO ERASE DTC (WITH GST)
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
10 seconds and then turn it “ON” (engine stopped) again.
2. Select Mode 4 with the Generic Scan Tool (GST). For details refer to EC-122, "
Generic Scan Tool (GST)
Function".
HOW TO ERASE DTC (NO TOOLS)
1. Disconnect battery for 24 hours.
2. Reconnect battery.
Malfunction Indicator Lamp (MIL)INFOID:0000000003532242
DESCRIPTION
SCIA5671E

TROUBLE DIAGNOSIS
AT-43
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TROUBLE DIAGNOSIS
DTC Inspection Priority ChartINFOID:0000000003532243
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 is displayed with other DTCs, first perform the trouble diagnosis for DTC U1000. Refer to
AT- 9 1
.
Fail-SafeINFOID:0000000003532244
The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is an error in a
main electronic control input/output signal circuit. In fail-safe mode the transmission is fixed in 2nd, 4th or 5th
(depending on the breakdown position), so the customer should feel “slipping” or “poor acceleration”.
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF” the ignition switch for 10 seconds, then switch it “ON” again to return to
the normal shift pattern. Therefore, the customer's vehicle has returned to normal, so handle according to the
“diagnostics flow” (Refer to AT-44, "
How To Perform Trouble Diagnosis for Quick and Accurate Repair").
FAIL-SAFE FUNCTION
If any malfunction occurs in a sensor or solenoid, this function controls the A/T to mark driving possible.
Vehicle Speed Sensor
• Signals are input from two systems - from vehicle speed sensor A/T (revolution sensor) installed on the
transmission and from combination meter so normal driving is possible even if there is a malfunction in one
of the systems. And if vehicle speed sensor A/T (revolution sensor) has unusual cases, 5th gear is prohib-
ited.
Accelerator Pedal Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.
Throttle Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based on
input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order to
make driving possible.
PNP Switch
• In the unlikely event that a malfunction signal enters the TCM, the position indicator is switched “OFF”, the
starter relay is switched “OFF” (starter starting is disabled), the back-up lamp relay switched “OFF” (back-up
lamp is OFF) and the position is fixed to the “D” range to make driving possible.
Starter Relay
• The starter relay is switched “OFF”. (Starter starting is disabled.)
A/T Interlock
• If there is an A/T interlock judgment malfunction, the transmission is fixed in 2nd gear to make driving possi-
ble.
NOTE:
When the vehicle is driven fixed in 2nd gear, a turbine revolution sensor malfunction is displayed,
but this is not a turbine revolution sensor malfunction.
• When the coupling pattern below is detected, the fail-safe action corresponding to the pattern is performed.
A/T INTERLOCK COUPLING PATTERN TABLE
Priority Detected items (DTC)
1 U1000 CAN communication line
2 Except above

TROUBLE DIAGNOSIS
AT-89
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DTC WORK SUPPORT MODE
Display Items List
ATF WARN LAMP (ON-OFF display) — — X
BACK-UP LAMP (ON-OFF display) — — X
STARTER RELAY (ON-OFF display) — — X
PNP SW3 MON (ON-OFF display) — — X
C/V CLB ID1 — — X
C/V CLB ID2 — — X
C/V CLB ID3 — — X
UNIT CLB ID1 — — X
UNIT CLB ID2 — — X
UNIT CLB ID3 — — X
TRGT GR RATIO — — X
TRGT PRES TCC (kPa) — — X
TRGT PRES L/P (kPa) — — X
TRGT PRES I/C (kPa) — — X
TRGT PRE FR/B (kPa) — — X
TRGT PRES D/C (kPa) — — X
TRG PRE HLR/C (kPa) — — X
SHIFT PATTERN — — X
DRV CST JUDGE — — X
START RLY MON — — X
NEXT GR POSI — — X
SHIFT MODE — — X
MANU GR POSI — — X
VEHICLE SPEED (km/h) — XX Vehicle speed recognized by the TCM.
Voltage (V) — — XDisplays the value measured by the voltage
probe.
Frequency (Hz) — — X
The value measured by the pulse probe is dis-
played. DUTY-HI (high) (%) — — X
DUTY-LOW (low) (%) — — X
PLS WIDTH-HI (ms) — — X
PLS WIDTH-LOW (ms) — — XMonitored item (Unit)Monitor Item Selection
Remarks ECU IN-
PUT SIG-
NALSMAIN SIG-
NALSSELEC-
TION
FROM
MENU
DTC work support itemDescription Check item
I/C SOL FUNCTN CHECK* — —
FR/B SOL FUNCTN CHECK* — —
D/C SOL FUNCTN CHECK* — —
HLR/C SOL FUNCTN CHECK* — —