2011 INFINITI QX56 coolant temperature

DIAGNOSIS SYSTEM (ECM)EC-65
< SYSTEM DESCRIPTION > [VK56VD]
C
D
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G H
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EC
NP
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Freeze Frame Data and 1st Trip Freeze Frame Data
*: The items are the same as those of 1st trip freeze frame data.
DATA MONITOR MODE
Monitored Item
×
: Applicable
Freeze frame data
item* Description
DIAG TROUBLE
CODE
[PXXXX]  The engine control compon
ent part/control system has a trouble code the is displayed as PXXXX. (Refer to
EC-98, "
DTC Index".)
CAL/LD VALUE [%]  The calculated load value at the moment a malfunction is detected is displayed.
COOLANT TEMP [ °C]
or [ °F]  The engine coolant temperature at the moment a malfunction is detected is displayed.
L-FUEL TRM-B1 [%]  “Long-term fuel trim” at the moment a malfunction is detected is displayed.
 The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than short-term fuel trim.
L-FUEL TRM-B2 [%]
S-FUEL TRM-B1 [%]  “Short-term fuel trim” at the moment a malfunction is detected is displayed.
 The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel sched-ule.
S-FUEL TRM-B2 [%]
ENGINE SPEED [rpm]  The engine
speed at the moment a malfunction is detected is displayed.
VEHICL SPEED
[km/h] or [mph]  The vehicle speed at the moment a malfunction is detected is displayed.
INT MANI PRES [kPa]  These items are displayed but are not applicable to this model.
ABSOL TH·P/S [%]  The throttle valve opening angle at the moment a malfunction is detected is displayed.
B/FUEL SCHDL
[msec]  The base fuel schedule at the moment a malfunction is detected is displayed.
INT/A TEMP SE [ °C]
or [ °F]  The intake air temperature at the moment a malfunction is detected is displayed.
FUEL SYS-B1  “Fuel injection system status” at the moment a malfunction is detected is displayed.  One of the following mode is displayed.
Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop
FUEL SYS-B2
COMBUST CONDI-
TION
 These items are displayed but are not applicable to this model.
Monitored item Unit Description Remarks
ENG SPEED rpm  Indicates the engine speed computed from the sig-
nal of the crankshaft position sensor and camshaft
position sensor.  Accuracy becomes poor if
engine speed drops below
the idle rpm.
 If the signal is interrupted while the engine is running,
an abnormal value may be
indicated.
MAS A/F SE-B1 V  The signal voltage of the mass air flow sensor is
displayed.  When the engine is stopped,
a certain value is indicated.
 When engine is running,
specification range is indicat-
ed in “SPEC”.
B/FUEL SCHDL ms  “Base fuel schedule” indicates the fuel injection
pulse width programmed into ECM, prior to any
learned on board correction.  When engine is running,
specification range is indicat-
ed in “SPEC”.
Revision: 2010 May2011 QX56

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
Revision: 2010 May2011 QX56

EC-70
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
*: The item is indicated, but not used.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ACTIVE TEST MODE
Test Item
ECM TEMP 1
°C or °F  Displays a temperature calculated from a signal of
ECM temperature sensor 1.
ECM TEMP 2 °C or °F  Displays a temperature calculated from a signal of
ECM temperature sensor 2.
FUEL PUMP DUTY %  The control condition of the fuel pump control mod-
ule (FPCM) (determined by ECM according to the
input signals) is indicated.
Monitored item Unit Description Remarks
TEST ITEM CONDITION JUDGMENT CHECK ITEM (REMEDY)
VENT CON-
TROL/V  Ignition switch: ON (Engine
stopped)
 Turn solenoid valve ON and OFF with the CONSULT-III and listen
to operating sound. Solenoid valve makes an operating
sound.
 Harness and connectors
 Solenoid valve
ENG COOLANT
TEMP  Engine: Return to the original
non-standard condition
 Change the engine coolant tem- perature using CONSULT-III. If malfunctioning symptom disap-
pears, see CHECK ITEM.  Harness and connectors
 Engine coolant temperature sen-
sor
 Fuel injector
FUEL INJEC-
TION  Engine: Return to the original
non-standard condition
 Change the amount of fuel injec- tion using CONSULT-III. If malfunctioning symptom disap-
pears, see CHECK ITEM.
 Harness and connectors
 Fuel injector
 Air fuel ratio (A/F) sensor 1
FUEL/T TEMP
SEN  Change the fuel tank temperature using CONSULT-III.
PURG VOL
CONT/V  Engine: After warming up, run en-
gine at 1,500 rpm.
 Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-III. Engine speed changes according to
the opening percent.
 Harness and connectors
 Solenoid valve
FAN DUTY CON-
TROL* Ignition switch: ON
 Change duty ratio using CON-
SULT-III. Cooling fan speed changes.  Harness and connectors
 Cooling fan motor
 Cooling fan relay
 Cooling fan control module
 IPDM E/R
ALTERNATOR
DUTY Engine: Idle
 Change duty ratio using CON-
SULT-III. Battery voltage changes.  Harness and connectors
 IPDM E/R
Alternator
POWER BAL-
ANCE  Engine: After warming up, idle the
engine.
 A/C switch OFF
 Selector lever: P or N
 Cut off each injector signal one at a time using CONSULT-III. Engine runs rough or stops.
 Harness and connectors
 Compression
 Fuel injector
 Power transistor
Spark plug
 Ignition coil
IGNITION TIM-
ING  Engine: Return to the original
non-standard condition
 Timing light: Set
 Retard the ignition timing using
CONSULT-III. If malfunctioning symptom disap-
pears, see CHECK ITEM.
 Perform Idle Air Volume Learning.
Revision: 2010 May2011 QX56

EC-72
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
ECU DIAGNOSIS INFORMATION
ECM
Reference ValueINFOID:0000000006217730
VALUES ON THE DIAGNOSIS TOOL
NOTE:
 Specification data are reference values.
 Specification data are output/input values which are
detected or supplied by the ECM at the connector.
* Specification data may not be directly relat ed to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show
the specification data in spite of the ignition timing not being adjusted to the specification data. This IGN TIM-
ING monitors the data calculated by the ECM accordi ng to the signals input from the camshaft position sen-
sor and other ignition timing related sensors.
CONSULT-III MONITOR ITEM
Monitor Item Condition Values/Status
ENG SPEED  Run engine and compare CONSULT-III value with the tachometer indication. Almost the same speed as
the tachometer indication
MAS A/F SE-B1 See EC-161, "
Description".
B/FUEL SCHDL See EC-161, "
Description".
A/F ALPHA-B1 See EC-161, "
Description".
A/F ALPHA-B2 See EC-161, "
Description".
COOLAN TEMP/S  Ignition switch: ON Indicates engine coolant
temperature
A/F SEN1 (B1)  Engine: After warming up Maintaining engine speed at 2,000 rpm Fluctuates around 1.5 V
A/F SEN1 (B2)  Engine: After warming up Maintaining engine speed at 2,000 rpm Fluctuates around 1.5 V
HO2S2 (B1)  Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load 0 - 0.3 V
⇔ Approx. 0.6 - 1.0
V
HO2S2 (B2)  Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load 0 - 0.3 V
⇔ Approx. 0.6 - 1.0
V
HO2S2 MNTR (B1)  Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and
at idle for 1 minute under no load LEAN
⇔ RICH
HO2S2 MNTR (B2)  Revving engine from idle up to 3,000 rpm quickly after the following condi-
tions are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load LEAN
⇔ RICH
VHCL SPEED SE  Turn drive wheels and compare CONSULT-III value with the speedometer in-
dication. Almost the same speed as
speedometer indication
BATTERY VOLT  Ignition switch: ON (Engine stopped) 11 - 14 V
ACCEL SEN 1  Ignition switch: ON
(Engine stopped) Accelerator pedal: Fully released 0.65 - 0.87 V
Accelerator pedal: Fully depressed 4.3 - 4.8 V
ACCEL SEN 2*
1 Ignition switch: ON (Engine stopped) Accelerator pedal: Fully released 0.56 - 0.96 V
Accelerator pedal: Fully depressed 4.0 - 4.8 V
Revision: 2010 May2011 QX56

EC-76
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
EVAP DIAG READY  Ignition switch: ON Indicates the ready condi-
tion of EVAP leak diagnosis.
VVEL LEARN  Ignition switch: OFF
→ ON
(After warming up) VVEL learning has no
t been performed
yet. YET
VVEL learning has already been per-
formed successfully. DONE
VVEL SEN LEARN-B1  VVEL learning has already been performed successfully Approx. 0.30 - 0.80 V
VVEL SEN LEARN-B2  VVEL learning has already been performed successfully Approx. 0.30 - 0.80 V
VVEL POSITION SEN-
B1  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0.25 - 1.50 V
When revving engine up to 2,000 rpm
quickly
Approx. 0.25 - 4.75 V
VVEL POSITION SEN-
B2  Engine: After warming up
 Selector lever: P or N position
 Air conditioner switch: OFF
No load Idle Approx. 0.25 - 1.50 V
When revving engine up to 2,000 rpm
quickly
Approx. 0.25 - 4.75 V
VVEL TIM-B1  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0 - 23 deg
When revving engine up to 2,000 rpm
quickly
Approx. 0 - 90 deg
VVEL TIM-B2  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0 - 23 deg
When revving engine up to 2,000 rpm
quickly
Approx. 0 - 90 deg
FPCM  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load  Engine: Cranking HI
 Revving engine from idle to 4,000 rpm
quickly MID
 Engine: Idle
 Engine coolant temperature: More than 10 °C (50 °F) LOW
BAT TEMP SEN  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle
Indicates the temperature
around the battery.
COOLING FAN SPD  Engine speed: Idle
 Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Water temp: Less than 98
°C Approx. 100 – 200 rpm
Water temp: More than 98 °C Approx. 600 – 700 rpm
THRTL STK CNT B1 NOTE:
The item is indicated, but not used. —
HO2 S2 DIAG2(B1) NOTE:
The item is indicated, but not used.
—
HO2 S2 DIAG2(B2) NOTE:
The item is indicated, but not used. —
FUEL INJ TIMG Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 16 deg
2,000 rpm Approx.
−170 deg
H/P FUEL PUMP DEG  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 211.0 deg
2,000 rpm Approx. 206.0 deg
Monitor Item Condition Values/Status
Revision: 2010 May2011 QX56

ECM
EC-81
< ECU DIAGNOSIS INFORMATION > [VK56VD]
C
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23
(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
Revision: 2010 May2011 QX56

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
Revision: 2010 May2011 QX56

EC-94
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
DTC No. Detected items Engine operating condition in fail-safe mode
U0113
U1003
U1024 Can communication circuit VVEL actuator
motor relay is turned off, and VVEL value is become at a minimum angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
P0011
P0021 Intake valve timing control The signal is not energized to the intake valve timing control solenoid valve and the valve
control does not function.
P0087 FRP control system  Engine torque is limited.
 VVEL value is maintained at a fixed angle.
P0088 Engine speed is limited.
P008A Low fuel pressure control
system Engine torque is limited.
P0090 FRP control system  Engine torque is limited.
 VVEL value is maintained at a fixed angle.
P0102
P0103 Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117
P0118 Engine coolant tempera-
ture sensor circuit
Engine coolant temperature will be determined by ECM based on the following condition.
CONSULT-III displays the engine coolant temperature decided by ECM.
Condition Engine coolant temperature decided
(CONSULT-III display)
Just as ignition switch is turned ON
or START 40
°C (104 °F)
Approx. 4 minutes or more after
engine starting 80
°C (176 °F)
Except as shown above 40 - 80 °C (104 - 176 °F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running.
P0122
P0123
P0222
P0223
P2135 Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
Therefore, the acceleration will be poor.
P0190 FRP sensor  Engine speed is limited.
 High pressure fuel pump is activated at maximum discharge pressure.
P0201
P0202
P0203
P0204
P0205
P0206
P0207
P0208 Injector  Engine torque is limited.
 Fuel injection shut-off of malfunction cylinder.
 Mixture ratio feedback control does not function.
 Idle engine speed is increased.
P0500 Vehicle speed sensor The cooling fan operates (Highest) while engine is running.
P0524 Engine oil pressure The signal is not energized to the intake valve timing control solenoid valve and the valve
control does not function.
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0605 ECM (When ECM calculation function is malfunctioning:)
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
ECM deactivates ASCD operation.
P0607 ECM VVEL actuator motor relay is
turned off, and VVEL value is become at a minimum angle.
Engine speed will not rise more than 3,500 rpm due to the fuel cut.
Revision: 2010 May2011 QX56