2006 INFINITI M35 cooling

TROUBLE DIAGNOSIS
EC-117
[VQ35DE]
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Revision: 2006 January2006 M35/M45
: Vehicle front
1. Crankshaft position sensor (POS) 2. ICC brake hold relay 3. EVAP canister vent control valve
4. EVAP control system pressure sen-
sor5. EVAP canister 6. Cooling fan relay
7. Battery current sensor
PBIB2790E

TROUBLE DIAGNOSIS
EC-135
[VQ35DE]
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Revision: 2006 January2006 M35/M45
X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to EC-59, "
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME
DATA" .
*3: Always “CMPLT” is displayed.
INSPECTION PROCEDURE
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data
link connector (1), which is located under LH dash panel near
the hood opener handle.
3. Turn ignition switch ON.
ENGINE CONTROL COMPONENT PARTS
OUTPUT
Fuel injector
Power transistor (Ignition timing)
Throttle control motor relay
Throttle control motor
EVAP canister purge volume con-
trol solenoid valve
FPCM
Air conditioner relay
Fuel pump relay
Cooling fan relay
Air fuel ratio (A/F) sensor 1 heater*3
Heated oxygen sensor 2 heater*3
EVAP canister vent control valve
Intake valve timing control solenoid
valve
Alternator
Calculated load value
ItemDIAGNOSTIC TEST MODE
WORK
SUP-
PORTSELF-DIAGNOS-
TIC RESULTS
DATA
MONI-
TORDATA
MONI-
TOR
(SPEC)ACTIVE
TESTDTC & SRT
CONFIRMATION
DTC*1FREEZE
FRAME
DATA*2SRT
STATUSDTC
WORK
SUP-
PORT
PBIB2712E

TROUBLE DIAGNOSIS
EC-141
[VQ35DE]
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Revision: 2006 January2006 M35/M45TRVL AFTER MIL
[km] or [mile]Distance traveled while MIL is activated.
A/F S1 HTR (B1)
[%]
Air fuel ratio (A/F) sensor 1 heater control
value computed by ECM according to the
input signals.
The current flow to the heater becomes
larger as the value increases. A/F S1 HTR (B2)
[%]
AC PRESS SEN
[V]
The signal voltage from the refrigerant
pressure sensor is displayed.
VHCL SPEED SE
[km/h] or [mph]
The vehicle speed computed from the
vehicle speed signal sent from combina-
tion meter is displayed.
SET VHCL SPD
[km/h] or [mph]
The preset vehicle speed is displayed.
MAIN SW
[ON/OFF]
Indicates [ON/OFF] condition from MAIN
switch signal.
CANCEL SW
[ON/OFF]
Indicates [ON/OFF] condition from CAN-
CEL switch signal.
RESUME/ACC SW
[ON/OFF]
Indicates [ON/OFF] condition from
RESUME/ACCELERATE switch signal.
SET SW
[ON/OFF]
Indicates [ON/OFF] condition from SET/
COAST switch signal.
BRAKE SW1
[ON/OFF]
Indicates [ON/OFF] condition from ASCD
brake switch signal.
BRAKE SW2
[ON/OFF]
Indicates [ON/OFF] condition of stop
lamp switch signal.
DIST SW
[ON/OFF]
Indicates [ON/OFF] condition from DIS-
TANCE switch signal.
CRUISE LAMP
[ON/OFF]
Indicates [ON/OFF] condition of CRUISE
lamp determined by the ECM according
to the input signals.
SET LAMP
[ON/OFF]
Indicates [ON/OFF] condition of SET
lamp determined by the ECM according
to the input signals.
FAN D UTY
Indicates a command value for cooling
fan. The value is calculated by ECM
based on input signals.
AC EVA TEMP
Indicates A/C evaporator temperature
sent from “unified meter and A/C amp.”.
AC EVA TARGET
Indicates target A/C evaporator tempera-
ture sent from “unified meter and A/C
amp.”.
ALTDUTY [%]
Indicates the duty ratio of the power gen-
eration command value. The ratio is cal-
culated by ECM based on the battery
current sensor signal.
BAT CUR SEN
[mV]
The signal voltage of battery current sen-
sor is displayed. Monitored item
[Unit]ECM
INPUT
SIG-
NALSMAIN
SIG-
NALSDescription Remarks

EC-144
[VQ35DE]
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
*: Leaving cooling fan OFF with CONSULT-II while engine is running may cause the engine to overheat.
DTC & SRT CONFIRMATION MODE
SRT STATUS Mode
For details, refer to EC-60, "SYSTEM READINESS TEST (SRT) CODE" .
SRT WORK SUPPORT Mode
This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.
DTC WORK SUPPORT Mode
*: DTC P1442 and P1456 does not apply to Y50 models but appears in DTC Work Support Mode screens. FA N D U T Y C O N -
TROL*
Ignition switch: ON
Change duty ratio using CON-
SULT-II.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-II.Battery voltage changes.
Harness and connectors
IPDM E/R
Alternator TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY)
Test mode Test item Corresponding DTC No. Reference page
EVAPORATIVE SYSTEMEVP SML LEAK P0442/P1442*P0442EC-403
P0455EC-458
EVP V/S LEAK P0456/P1456* P0456EC-466
PURG VOL CN/V P1444 P0443EC-412
PURG FLOW P0441 P0441EC-398
A/F SEN1A/F SEN1 (B1) P1278/P1279 P0133EC-274A/F SEN1 (B1) P1276 P0130EC-246
A/F SEN1 (B2) P1288/P1289 P0153EC-274
A/F SEN1 (B2) P1286 P0150EC-246
HO2S2HO2S2 (B1) P1146 P0138EC-297
HO2S2 (B1) P1147 P0137EC-286
HO2S2 (B1) P0139 P0139EC-310
HO2S2 (B2) P1166 P0158EC-297
HO2S2 (B2) P1167 P0157EC-286
HO2S2 (B2) P0159 P0159EC-310

EC-226
[VQ35DE]
DTC P0117, P0118 ECT SENSOR
Revision: 2006 January2006 M35/M45
DTC P0117, P0118 ECT SENSORPFP:22630
Component DescriptionNBS004VC
The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

*: These data are reference values and are measured between ECM terminal 73
(Engine coolant temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis LogicNBS004VD
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
SEF594K
Engine coolant temperature
C (F)Voltage* V Resistance k
–10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
SEF012P
DTC No.Trouble Diagnosis
NameDTC Detecting Condition Possible Cause
P0117
0117Engine coolant tem-
perature sensor cir-
cuit low inputAn excessively low voltage from the sensor is
sent to ECM.
Harness or connectors
(The sensor circuit is open or shorted.)
Engine coolant temperature sensor
P0118
0118Engine coolant tem-
perature sensor cir-
cuit high inputAn excessively high voltage from the sensor is
sent to ECM.
Detected items Engine operating condition in fail-safe mode
Engine coolant temper-
ature sensor circuitEngine coolant temperature will be determined by ECM based on the time after turning ignition switch ON
or START.
CONSULT-II displays the engine coolant temperature decided by ECM.
ConditionEngine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned ON or START 40
C (104F)
More than approx. 4 minutes after ignition ON or START 80
C (176F)
Except as shown above40 - 80
C (104 - 176F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates
while engine is running.

DTC P0506 ISC SYSTEM
EC-483
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Revision: 2006 January2006 M35/M45
DTC P0506 ISC SYSTEMPFP:23781
DescriptionNBS0051T
NOTE:
If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan
operation, etc.).
On Board Diagnosis LogicNBS0051U
DTC Confirmation ProcedureNBS0051V
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test.
If the target idle speed is out of the specified value, perform EC-96, "Idle Air Volume Learning" ,
before conducting DTC Confirmation Procedure. For the target idle speed, refer to the EC-724,
"SERVICE DATA AND SPECIFICATIONS (SDS)" .
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
Always perform the test at a temperature above 10C (14F).
WITH CONSULT-II
1. Open engine hood.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON again and select “DATA MONITOR”
mode with CONSULT-II.
5. Start engine and run it for at least 1 minute at idle speed.
6. If 1st trip DTC is detected, go to EC-484, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0506
0506Idle speed control sys-
tem RPM lower than
expectedThe idle speed is less than the target idle
speed by 100 rpm or more.
Electric throttle control actuator
Intake air leak
SEF174Y

DTC P0507 ISC SYSTEM
EC-485
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Revision: 2006 January2006 M35/M45
DTC P0507 ISC SYSTEMPFP:23781
DescriptionNBS0051X
NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan
operation, etc.).
On Board Diagnosis LogicNBS0051Y
DTC Confirmation ProcedureNBS0051Z
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test.
If the target idle speed is out of the specified value, perform EC-96, "Idle Air Volume Learning" ,
before conducting DTC Confirmation Procedure. For the target idle speed, refer to the EC-724,
"SERVICE DATA AND SPECIFICATIONS (SDS)" .
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
Always perform the test at a temperature above 10C (14F).
WITH CONSULT-II
1. Open engine hood.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON again and select “DATA MONITOR”
mode with CONSULT-II.
5. Start engine and run it for at least 1 minute at idle speed.
6. If 1st trip DTC is detected, go to EC-486, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0507
0507Idle speed control sys-
tem RPM higher than
expectedThe idle speed is more than the target idle
speed by 200 rpm or more.
Electric throttle control actuator
Intake air leak
PCV system
SEF174Y

EC-512
[VQ35DE]
DTC P1217 ENGINE OVER TEMPERATURE
Revision: 2006 January2006 M35/M45
DTC P1217 ENGINE OVER TEMPERATUREPFP:00000
DescriptionNBS00532
SYSTEM DESCRIPTION
NOTE:
If DTC P1217 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-173, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
If DTC P1217 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.
Refer to EC-176, "
DTC U1010 CAN COMMUNICATION" .
Cooling Fan Control
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM through CAN communication line.
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, air conditioner
ON signal, refrigerant pressure, target A/C evaporator temperature and A/C evaporator temperature.
Cooling fan control signal is sent to IPDM E/R from ECM by CAN communication line. Then, IPDM E/R sends
ON/OFF pulse duty signal to cooling fan control module. Corresponding to this ON/OFF pulse duty signal,
cooling fan control module gives cooling fan motor operating voltage to cooling fan motors. Cooling fan speed
is controlled by duty cycle of cooling fan motor operating voltage sent from cooling fan control module.
COMPONENT DESCRIPTION
Cooling Fan Control Module
Cooling fan control module (1) receives ON/OFF pulse duty signal
from IPDM E/R. Corresponding to this ON/OFF pulse duty signal,
cooling fan control module sends cooling fan motor operating volt-
age to cooling fan motor. The revolution speed of cooling fan motor
is controlled by duty cycle of the voltage.
: Vehicle front
Cooling fan motor-1 harness connector (2)
Cooling fan motor-2 harness connector (3)
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
1
Cooling fan
control
IPDM E/R
Cooling fan relay
Cooling fan control
module Battery
Battery voltage*
1
Wheel sensor
Vehicle speed*2
Engine coolant temperature sensor Engine coolant temperature
Air conditioner switch
Air conditioner ON signal*
2
Refrigerant pressure sensor Refrigerant pressure
Unified meter and A/C amp.
Target A/C evaporator temperature*
2
Intake sensor
A/C evaporator temperature*2
PBIB2691E