steering INFINITI QX56 2011 Factory Service Manual
[x] Cancel search | Manufacturer: INFINITI, Model Year: 2011, Model line: QX56, Model: INFINITI QX56 2011Pages: 5598, PDF Size: 94.53 MB
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![INFINITI QX56 2011 Factory Service Manual
EC-66
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
A/F ALPHA-B1
% The mean value of the air-fuel ratio feedback cor-
rection factor per cycle is indicated. When the engine is stopped,
a INFINITI QX56 2011 Factory Service Manual
EC-66
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
A/F ALPHA-B1
% The mean value of the air-fuel ratio feedback cor-
rection factor per cycle is indicated. When the engine is stopped,
a](/img/42/57033/w960_57033-2089.png)
EC-66
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
A/F ALPHA-B1
% The mean value of the air-fuel ratio feedback cor-
rection factor per cycle is indicated. When the engine is stopped,
a certain value is indicated.
This data also includes the data for the air-fuel ratio
learning control.
When engine is running, specification range is indicat-
ed in “SPEC”.
A/F ALPHA-B2
COOLAN TEMP/S
°C or °F The engine coolant temperature (determined by
the signal voltage of the engine coolant tempera-
ture sensor) is displayed. When the engine coolant
temperature sensor is open
or short-circuited, ECM en-
ters fail-safe mode. The en-
gine coolant temperature
determined by the ECM is
displayed.
A/F SEN1 (B1) V The A/F signal computed from the input signal of
the air fuel ratio (A/F) sensor 1 is displayed.
A/F SEN1 (B2)
HO2S2 (B1)
V The signal voltage of the heated oxygen sensor 2
is displayed.
HO2S2 (B2)
HO2S2 MNTR (B1)
RICH/LEAN Display of heated oxygen sensor 2 signal:
RICH: means the amount of oxygen after three
way catalyst is relatively small.
LEAN: means the amount of oxygen after three
way catalyst is relatively large. When the engine is stopped,
a certain value is indicated.
HO2S2 MNTR (B2)
VHCL SPEED SE km/h or mph The vehicle speed computed from the vehicle
speed signal sent from combination meter is dis-
played.
BATTERY VOLT V The power supply voltage of ECM is displayed.
ACCEL SEN 1
V The accelerator pedal position sensor signal volt-
age is displayed. ACCEL SEN 2 signal is con-
verted by ECM internally.
Thus, they differs from ECM
terminal voltage signal.
ACCEL SEN 2
TP SEN 1-B1
V The throttle position sensor signal voltage is dis-
played. TP SEN 2-B1 signal is con-
verted by ECM internally.
Thus, they differs from ECM
terminal voltage signal.
TP SEN 2-B1
FUEL T/TMP SE
°C or °F The fuel temperature (determined by the signal
voltage of the fuel tank temperature sensor) is dis-
played.
EVAP SYS PRES V The signal voltage of EVAP control system pres-
sure sensor is displayed.
FUEL LEVEL SE V The signal voltage of the fuel level sensor is dis-
played.
START SIGNAL ON/OFF Indicates start signal status [ON/OFF] computed
by the ECM according to the signals of engine
speed and battery voltage. After starting the engine,
[OFF] is displayed regard-
less of the starter signal.
CLSD THL POS ON/OFF Indicates idle position [ON/OFF] computed by
ECM according to the accelerator pedal position
sensor signal.
AIR COND SIG ON/OFF Indicates [ON/OFF] condition of the air conditioner
switch as determined by the air conditioner signal.
PW/ST SIGNAL ON/OFF [ON/OFF] condition of the power steering system
(determined by the signal voltage of the power
steering pressure sensor signal) is indicated.
Monitored item Unit Description Remarks
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ECM
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TP SEN 1-B1
Ignition switch: ON
(Engine stopped)
Selector lever: D position Accelerator pedal: Fully released More INFINITI QX56 2011 Factory Service Manual
ECM
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TP SEN 1-B1
Ignition switch: ON
(Engine stopped)
Selector lever: D position Accelerator pedal: Fully released More](/img/42/57033/w960_57033-2096.png)
ECM
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TP SEN 1-B1
Ignition switch: ON
(Engine stopped)
Selector lever: D position Accelerator pedal: Fully released More than 0.36 V
Accelerator pedal: Fully depressed Less than 4.75 V
TP SEN 2-B1*
1 Ignition switch: ON (Engine stopped)
Selector lever: D position Accelerator pedal: Fully released More than 0.36 V
Accelerator pedal: Fully depressed Less than 4.75 V
FUEL T/TMP SE Ignition switch: ON Indicates fuel tank tempera-
ture
EVAP SYS PRES Ignition switch: ON Approx. 1.8 - 4.8 V
FUEL LEVEL SE Ignition switch: ON Depending on fuel level of
fuel tank
START SIGNAL Ignition switch: ON → START → ON OFF → ON → OFF
CLSD THL POS Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released ON
Accelerator pedal: Slightly depressed OFF
AIR COND SIG Engine: After warming up, idle
the engine Air conditioner switch: OFF OFF
Air conditioner switch: ON
(Compressor operates.)
ON
PW/ST SIGNAL Engine: After warming up, idle
the engine Steering wheel: Not being turned OFF
Steering wheel: Being turned ON
LOAD SIGNAL Ignition switch: ON Rear window defogger switch: ON
and/or
Lighting switch: 2nd position
ON
Rear window defogger switch and lighting
switch: OFF OFF
IGNITION SW Ignition switch: ON → OFF → ON ON → OFF → ON
HEATER FAN SW Engine: After warming up, idle
the engine Heater fan switch: ON ON
Heater fan switch: OFF OFF
BRAKE SW Ignition switch: ON Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
IGN TIMING Engine: After warming up
Selector lever: P or N position
A/C switch: OFF
No load Idle 1 - 4
°BTDC
2,000 rpm 25 - 45 °BTDC
COMBUSTION — These items are displayed
but are not applicable to this
model.
CAL/LD VALUE Engine: After warming up
Selector lever: P or N position
A/C switch: OFF
No load Idle 5 - 35%
2,500 rpm 5 - 35%
MASS AIRFLOW Engine: After warming up
Selector lever: P or N position
A/C switch: OFF
No load Idle 2.0 - 6.0 g/s
2,500 rpm 7.0 - 20.0 g/s
PURG VOL C/V Engine: After warming up
Selector lever: P or N position
A/C switch: OFF
No load Idle
(Accelerator pedal: Not depressed even
slightly, after engine starting.)
0%
2,000 rpm 5%
INT/V SOL (B1) Engine: After warming up
Selector lever: P or N position
A/C switch: OFF
No load Idle 0 - 2%
2,000 rpm Approx. 0 - 50%
Monitor Item Condition Values/Status
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ECM
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(V) 45
(L/O) Low fuel pressure sensor Input [Engine is running]
Warm-up condition
Idle speed
2.4 - 3.6 V
[Engin INFINITI QX56 2011 Factory Service Manual
ECM
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(V) 45
(L/O) Low fuel pressure sensor Input [Engine is running]
Warm-up condition
Idle speed
2.4 - 3.6 V
[Engin](/img/42/57033/w960_57033-2104.png)
ECM
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(V) 45
(L/O) Low fuel pressure sensor Input [Engine is running]
Warm-up condition
Idle speed
2.4 - 3.6 V
[Engine is running]
Warm-up condition
Engine speed: 2,000 rpm 2.4 - 3.6 V
25
(LG) —Sensor ground
[Mass air flow sensor/ Intake air
temperature sensor] —— —
27
(P) 45
(L/O) Sensor power supply
(Power steering pressure sen-
sor/ Low fuel pressure sensor/
Electrically-controlled cooling
fan coupling)
— [Ignition switch: ON] 5 V
28
(SB) 40
(W/L) Sensor power supply
(Fuel rail pressure sensor/En-
gine oil pressure sensor)
— [Ignition switch: ON] 5 V
29
(W) 35
(—) Knock sensor (bank 1) Input [Engine is running]
Idle speed
2.0 V*
1
31
(V/W) 40
(W/L) Fuel rail pressure sensor Input [Engine is running]
Warm-up condition
Idle speed
0.98 - 1.2 V
[Engine is running]
Warm-up condition
Revving engine from idle to 4,000 rpm quickly 1.1 - 2.9 V
32
(R) 40
(W/L) Engine coolant temperature
sensor
Input [Engine is running] 0 - 4.8 V
Output voltage varies with engine
coolant temperature.
33
(W) 35
(—) Knock sensor (bank 2) Input [Engine is running]
Idle speed
2.0 V*
1
35
(—) —Sensor ground
(Knock sensor)
—— —
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JPBIA3357ZZ
JPBIA3358ZZ
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EC-82
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
37
(V) 175
(B) Cooling fan speed Input [Ignition switch: ON]
Engine stopped
5 V
[Engine is running]
Idle speed
After warm-up condition BATTERY VO INFINITI QX56 2011 Factory Service Manual
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< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
37
(V) 175
(B) Cooling fan speed Input [Ignition switch: ON]
Engine stopped
5 V
[Engine is running]
Idle speed
After warm-up condition BATTERY VO](/img/42/57033/w960_57033-2105.png)
EC-82
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
37
(V) 175
(B) Cooling fan speed Input [Ignition switch: ON]
Engine stopped
5 V
[Engine is running]
Idle speed
After warm-up condition BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
Idle speed
Before warm-up condition BATTERY VOLTAGE
(11 - 14 V)
39
(P/B) 45
(L/O) Power steering pressure sensor Input [Engine is running]
Steering wheel: Being turned
0.5 - 4.5 V
[Engine is running]
Steering wheel: Not being turned 0.4 - 0.8 V
40
(W/L) —Sensor ground
(Fuel rail pressure sensor/En-
gine coolant temperature sen-
sor/Engine oil temperature
sensor) —— —
42
(L/Y) 40
(W/L) Engine oil temperature sensor Input [Engine is running] 0 - 4.8 V
Output voltage varies with engine
oil temperature.
45
(L/O) —Sensor ground
(Power steering pressure sen-
sor/ Low fuel pressure sensor/
Electrically-controlled cooling
fan coupling) —— —
46
(SB) 175
(B) Fuel injector driver power supply Input [Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14 V)
[Ignition switch: OFF] 1.5 V
47
(G) 175
(B) Heated oxygen sensor 2 heater
(bank 1)
Input[Engine is running]
Engine speed: Below 3,600 rpm af-
ter the following conditions are met
- Engine: after warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute
and at idle for 1 minute under no
load 10 V
[Ignition switch: ON]
Engine: Stopped
[Engine is running]
Engine speed: Above 3,600 rpm BATTERY VOLTAGE
(11 - 14 V)
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JPBIA3332ZZ
JPBIA3733ZZ
JMBIA0037GB
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EC-90
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
111
(R) 175
(B) Fuel injector driver power supply Input [Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14 V)
11 2
(SB) 175
(B) Fuel injector driver powe INFINITI QX56 2011 Factory Service Manual
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ECM
111
(R) 175
(B) Fuel injector driver power supply Input [Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14 V)
11 2
(SB) 175
(B) Fuel injector driver powe](/img/42/57033/w960_57033-2113.png)
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ECM
111
(R) 175
(B) Fuel injector driver power supply Input [Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14 V)
11 2
(SB) 175
(B) Fuel injector driver power supply Input [Ignition switch: ON] BATTERY VOLTAGE
(11 - 14 V)
11 4 (B) — ECM ground — — —
11 5 (B) — ECM ground — — —
120 (Y) 175
(B) EVAP canister vent control valve Output [Ignition switch: ON] BATTERY VOLTAGE
(11 - 14 V)
122
(BR/ W) 175
(B) VVEL actuator motor relay abort
signal (VVEL control module)
Input [Ignition switch: ON] 0 V
123
(V/R) 175
(B) Throttle control mo
tor relay Output [Ignition switch: ON
→ OFF] 0 - 1.0 V
↓
BATTERY VOLTAGE
(11 - 14 V)
↓
0 V
[Ignition switch: ON] 0 - 1.0 V
125
(GR) 175
(B) Fuel pump control module
(FPCM)
Output[When cranking engine] 0 - 0.5 V
[Engine is running]
Warm-up condition
0 - 4.0 V
126 (O) 129
(P/L) Accelerator pedal position sen-
sor 2
Input[Ignition switch: ON]
Engine: Stopped
Accelerator pedal: Fully released
0.28 - 0.48 V
[Ignition switch: ON]
Engine: Stopped
Accelerator pedal: Fully depressed 2.0 - 2.5 V
128 (Y) 130
(R) ASCD steering switch Input [Ignition switch: ON]
ASCD steering switch: OFF
4 V
[Ignition switch: ON]
MAIN switch: Pressed 0 V
[Ignition switch: ON]
CANCEL switch: Pressed 1 V
[Ignition switch: ON]
RESUME/ACCELERATE switch: Pressed 3 V
[Ignition switch: ON]
SET/COAST switch: Pressed 2 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JPBIA3344ZZ
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(Y) 175
(B) ICC steering switch Input [Ignition switch: ON]
ICC steering switch: OFF
4.2 V
[Ignition switch: ON] INFINITI QX56 2011 Factory Service Manual
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(Y) 175
(B) ICC steering switch Input [Ignition switch: ON]
ICC steering switch: OFF
4.2 V
[Ignition switch: ON]](/img/42/57033/w960_57033-2114.png)
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(Y) 175
(B) ICC steering switch Input [Ignition switch: ON]
ICC steering switch: OFF
4.2 V
[Ignition switch: ON]
MAIN switch: Pressed 0 V
[Ignition switch: ON]
CANCEL switch: Pressed 1.9 V
[Ignition switch: ON]
RESUME/ACCELERATE switch: Pressed 3.7 V
[Ignition switch: ON]
SET/COAST switch: Pressed 3.2 V
[Ignition switch: ON]
DISTANCE switch: Pressed 2.6 V
[Ignition switch: ON]
DYNAMIC DRIVER ASSISTANCE switch: Pressed 1.0 V
129
(P/L) —Sensor ground
(Accelerator pedal position sen-
sor 2)
—— —
130 (R) —Sensor ground
(ASCD steering switch/ICC
steering switch) —— —
131
(L/W) 129
(P/L) Sensor power supply
(Accelerator pedal position sen-
sor 2)
— [Ignition switch: ON] 5 V
133
(SB) 150
(R) Sensor power supply
(Refrigerant pressure sensor/
Battery current sensor/EVAP
control system pressure sensor)
— [Ignition switch: ON] 5 V
134
(V/W) 175
(B) Fuel temperature sensor Input
[Engine is running]
Warm-up condition2.8 V
136 (W/
R) 140
(R/Y) Accelerator pedal position sen-
sor 1
Input[Ignition switch: ON]
Engine: Stopped
Accelerator pedal: Fully released
0.65 - 0.87 V
[Ignition switch: ON]
Engine: Stopped
Accelerator pedal: Fully depressed 4.3 - 4.8 V
137 (W/
G) 140
(R/Y) Sensor power supply
(Accelerator pedal position sen-
sor 1)
— [Ignition switch: ON] 5 V
138 (V) 150
(R) Battery current sensor Input [Engine is running]
Battery: Fully charged*
2
Idle speed2.6 - 3.5 V
139 (G) 175
(B) Battery temperature sensor Input [Engine is running]
Battery temperature: 25
°C
Idle speed 3.3 V
140
(R/Y) —Sensor ground
(Accelerator pedal position sen-
sor 1) —— —
141
(SB) 175
(B) Ignition switch Input [Ignition switch: OFF] 0 V
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14 V)
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
Revision: 2010 May2011 QX56
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EC-98
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
NOTE:
*: If “P1197” is displayed with other DTC in priority 1, perform trouble diagnosis for “P1197” first.
DTC IndexINFOID:0000000006217733
× INFINITI QX56 2011 Factory Service Manual
EC-98
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
NOTE:
*: If “P1197” is displayed with other DTC in priority 1, perform trouble diagnosis for “P1197” first.
DTC IndexINFOID:0000000006217733
×](/img/42/57033/w960_57033-2121.png)
EC-98
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ECM
NOTE:
*: If “P1197” is displayed with other DTC in priority 1, perform trouble diagnosis for “P1197” first.
DTC IndexINFOID:0000000006217733
×
:Applicable —: Not applicable
2 P0031 P0032 P0051 P0052 Air fuel ratio (A/F) sensor 1 heater
P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater
P0075 P0081 Intake valve timing control solenoid valve
P0130 P0131 P0132 P0133 P0150 P0151 P0152 P015 3 P2A00 P2A03 Air fuel ratio (A/F) sensor 1
P0137 P0138 P0139 P0157 P0158 P0159 Heated oxygen sensor 2
P0190 - P0193 FRP sensor
P0441 EVAP control system purge flow monitoring
P0443 P0444 P0445 EVAP canister purge volume control solenoid valve
P0447 P0448 EVAP canister vent control valve
P0451 P0452 P0453 EVAP control system pressure sensor
P0550 Power steering pressure sensor
P0603 ECM power supply
P0710 P0717 P0720 P0729 P0730 P0731 P0732 P0733 P0734 P0735 P0740 P0744 P0745 P0750 P0775 P0780 P0795 P1730 P1734 P2713 P2722 P2731 P2807 A/T related sensors, solenoid valves and switches
P1087 P1088 VVEL system
P1090 P1093 VVEL actuator motor
P1091 VVEL actuat or motor relay
P1217 Engine over temperature (OVERHEAT)
P1650 Starter motor relay 2
P1651 Starter motor relay
P2101 Electric throttle control function
P2118 Throttle control motor
P1805 Brake switch
P2100 P2103 Throttle control motor relay
P2101 Electric throttle control function
3 P0011 P0021 Intake valve timing control P0087, P0088, P0090 FRP control system
P008A Low fuel pressure control system
P008B Low fuel pressure control system
P0171 P0172 P0174 P0175 Fuel injection system function
P0201 - P0208 Injector
P0300 - P0308 Misfire
P0420 P0430 Three way catalyst function
P0456 EVAP control system (VERY SMALL LEAK)
P0506 P0507 Idle speed control system
P050E Cold start control
P0524 Engine oil pressure
P1148 P1168 Closed loop control
P1212 TCS communication line
P1421 Cold start control
P1564 ASCD steering switch / ICC steering switch
P1652 Starter motor system communication
P2119 Electric throttle control actuator
P1564 ASCD steering switch / ICC steering switch
P1568 ICC command value
P1572 ASCD brake switch / ICC brake switch
P1574 ASCD vehicle speed sensor / ICC vehicle speed sensor
Priority Detected items (DTC)
DTC*1
Items
(CONSULT-III screen terms) SRT code Trip MIL
Reference
page
CONSULT-III
GST*
2ECM*3
U0101 0101 LOST COMM (TCM) — 1 ×EC-171
U0113 0113 CAN COMM CIRCUIT — 1 ×EC-173
U1001
1001*4CAN COMM CIRCUIT — 1 or 2 — EC-172
U1003 1003 CAN COMM CIRCUIT — 2 — EC-173
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BASIC INSPECTIONEC-139
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BASIC INSPECTION
Work ProcedureINFOID:0000000006217739
1.INSPECTION START
1. Check service records for any recent INFINITI QX56 2011 Factory Service Manual
BASIC INSPECTIONEC-139
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BASIC INSPECTION
Work ProcedureINFOID:0000000006217739
1.INSPECTION START
1. Check service records for any recent](/img/42/57033/w960_57033-2162.png)
BASIC INSPECTIONEC-139
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BASIC INSPECTION
Work ProcedureINFOID:0000000006217739
1.INSPECTION START
1. Check service records for any recent repairs that ma y indicate a related malfunction, or a current need for
scheduled maintenance.
2. Open engine hood and check the following:
- Harness connectors for improper connections
- Wiring harness for improper connections, pinches and cut
- Vacuum hoses for splits, kinks and improper connections
- Hoses and ducts for leakage
- Air cleaner clogging
- Gasket
3. Check that electrical or mechanical loads are not applied.
- Headlamp switch is OFF.
- Air conditioner switch is OFF.
- Rear window defogger switch is OFF.
- Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Check that engine stays below 1,000 rpm.
5. Run engine at approximately 2,000 rpm for approximately 2 min- utes under no load.
6. Check that no DTC is displayed with CONSULT-III or GST.
Are any DTCs detected?
YES >> GO TO 2.
NO >> GO TO 3.
2.REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnosis Procedure.
>> GO TO 3
3.CHECK IDLE SPEED
1. Run engine at approximately 2,000 rpm for approximately 2 minutes under no load.
SEF983U
SEF976U
SEF977U
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EC-148
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IDLE AIR VOLUME LEARNING
IDLE AIR VOLUME LEARNING
DescriptionINFOID:0000000006217750
Idle Air Volume Learning is a function of ECM to learn
the idle air volume th INFINITI QX56 2011 Factory Service Manual
EC-148
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IDLE AIR VOLUME LEARNING
IDLE AIR VOLUME LEARNING
DescriptionINFOID:0000000006217750
Idle Air Volume Learning is a function of ECM to learn
the idle air volume th](/img/42/57033/w960_57033-2171.png)
EC-148
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IDLE AIR VOLUME LEARNING
IDLE AIR VOLUME LEARNING
DescriptionINFOID:0000000006217750
Idle Air Volume Learning is a function of ECM to learn
the idle air volume that keeps engine idle speed within
the specific range. It must be perfo rmed under the following conditions:
Each time the electric throttle control actuator or ECM is replaced.
Idle speed or ignition timing is out of the specification.
Work ProcedureINFOID:0000000006217751
1.PRECONDITIONING
Check that all of the following conditions are satisfied.
Learning will be cancelled if any of the follo wing conditions are missed for even a moment.
Battery voltage: More than 12.9 V (At idle)
Engine coolant temperature: 70 - 105 °C (158 - 221 °F)
Selector lever position: P or N
Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, if the parking brake is applied before the engine is
started the headlamp will not illuminate.
Steering wheel: Neutral (Straight-ahead position)
Vehicle speed: Stopped
Transmission: Warmed-up
- With CONSULT-III: Drive vehicle until “ATF TEMP 2” in “DATA MONITOR” mode of “A/T” system indicates
less than 0.9 V.
- Without CONSULT-III: Drive vehicle for 10 minutes.
Will CONSULT-III be used?
YES >> GO TO 2.
NO >> GO TO 3.
2.PERFORM IDLE AIR VOLUME LEARNING
WITH CONSULT-III
1. Perform Accelerator Pedal Released Position Learning. Refer to EC-146, "
Work Procedure".
2. Perform Throttle Valve Closed Position Learning. EC-147, "
Work Procedure".
3. Start engine and warm it up to normal operating temperature.
4. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
5. Touch “START” and wait 20 seconds.
Is
“CMPLT” displayed on CONSULT-III screen?
YES >> GO TO 4.
NO >> GO TO 5.
3.PERFORM IDLE AIR VOLUME LEARNING
WITHOUT CONSULT-III
NOTE:
It is better to count the ti me accurately with a clock.
It is impossible to switch the di agnostic mode when an accelerator pedal position sensor circuit has
a malfunction.
1. Perform Accelerator Pedal Released Position Learning. Refer to EC-146, "
Work Procedure".
2. Perform Throttle Valve Closed Position Learning. EC-147, "
Work Procedure".
3. Start engine and warm it up to normal operating temperature.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Confirm that accelerator pedal is fully releas ed, turn ignition switch ON and wait 3 seconds.
6. Repeat the following procedure quickly 5 times within 5 seconds.
- Fully depress the accelerator pedal.
- Fully release the accelerator pedal.
7. Wait 7 seconds, fully depress the accelerator pedal for approx. 20 seconds until the MIL stops blinking
and turns ON.
8. Fully release the accelerator pedal within 3 seconds after the MIL turns ON.
Revision: 2010 May2011 QX56
Page 2185 of 5598
![INFINITI QX56 2011 Factory Service Manual
TROUBLE DIAGNOSIS - SPECIFICATION VALUEEC-161
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DescriptionINFOID:000000 INFINITI QX56 2011 Factory Service Manual
TROUBLE DIAGNOSIS - SPECIFICATION VALUEEC-161
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TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DescriptionINFOID:000000](/img/42/57033/w960_57033-2184.png)
TROUBLE DIAGNOSIS - SPECIFICATION VALUEEC-161
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TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DescriptionINFOID:0000000006217760
The specification (SP) value indicates the tolerance of
the value that is displayed in “SPEC” in “DATA MONI-
TOR” mode of CONSULT-III during normal operation of the Engine Control System. When the value in “SPEC”
in “DATA MONITOR” mode is within the SP value, t he Engine Control System is confirmed OK. When the
value in “SPEC” in “DATA MONITOR” mode is NOT wit hin the SP value, the Engine Control System may have
one or more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not illuminate
the MIL.
The SP value will be displayed for the following items:
B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correc- tion)
A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
MAS A/F SE-B1/B2 (The signal voltage of the mass air flow sensor)
IDLE FUEL PRES MAX/MIN (the signal voltage of the fuel rail pressure sensor)
Component Function CheckINFOID:0000000006217761
1.PRECONDITIONING
Check that all of the following conditions are satisfied.
TESTING CONDITION
Vehicle driven distance: More than 5,000 km (3,107 miles)
Barometric pressure: 98.3 - 104.3 kPa (0.983 - 1.043 bar, 1.003 - 1.064 kg/cm
2, 14.25 - 15.12 psi)
Atmospheric temperature: 20 - 30 °C (68 - 86 °F)
Engine coolant temperature: 75 - 95 °C (167 - 203 °F)
Transmission: Warmed-up
- After the engine is warmed up to normal operating temperat ure, drive vehicle until “ATF TEMP 2” (A/T fluid
temperature sensor signal) indicates more than 60 °C (140 °F).
Electrical load: Not applied
- Rear window defogger switch, air conditioner switch and li ghting switch are OFF. Steering wheel is straight
ahead.
Engine speed: Idle
Gear position: Neutral ( or parking)
>> GO TO 2.
2.PERFORM SPEC IN DATA MONITOR MODE
WITH CONSULT-III
NOTE:
Perform “SPEC” in “DATA MONITOR” mode in maximum scale display.
1. Perform EC-139, "
Work Procedure".
2. Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2”, “MAS A/F SE-B1” in “SPEC” of “DATA
MONITOR” mode with CONSULT-III.
3. Check that monitor items are within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> Proceed to EC-162, "
Diagnosis Procedure".
Revision: 2010 May2011 QX56