2008 INFINITI FX35 crank no start

DTC P0615 START SIGNAL CIRCUITAT-97
< SERVICE INFORMATION >
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DTC P0615 START SIGNAL CIRCUIT
DescriptionINFOID:0000000001327171
TCM prohibits cranking other than at “P” or “N” position.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001327172
On Board Diagnosis LogicINFOID:0000000001327173
Diagnostic trouble code “P0615 STARTER RELAY/CIRC” wit h CONSULT-III or 14th judgement flicker without
CONSULT-III is detected when starter relay is switc hed ON other than at “P” or “N” position. (Or when
switched OFF at “P” or “N” position).
Possible CauseINFOID:0000000001327174
 Harness or connectors (Starter relay and TCM circuit is open or shorted.)
 Starter relay circuit
DTC Confirmation ProcedureINFOID:0000000001327175
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III
and check monitor “STARTER RELAY” ON/OFF.
3. Start engine.
4. Drive vehicle for at least 2 consecutive seconds.
5. If DTC is detected, go to AT-99, "
Diagnosis Procedure".
Item name Condition Display value
STARTER RELAY Selector lever in “N
” and “P” positions. ON
Selector lever in other positions. OFF
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AT-112
< SERVICE INFORMATION >
DTC P0725 ENGINE SPEED SIGNAL
DTC P0725 ENGINE SPEED SIGNAL
DescriptionINFOID:0000000001327203
The engine speed signal is sent from the ECM to the TCM with CAN communication.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001327204
On Board Diagnosis LogicINFOID:0000000001327205
Diagnostic trouble code “P0725 ENGINE SPEED SIG” wit h CONSULT-III or 16th judgement flicker without
CONSULT-III is detected when TCM does not receive the ignition signal from ECM during engine cranking or
running.
Possible CauseINFOID:0000000001327206
Harness or connectors
(ECM to TCM circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000001327207
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, alw ays turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III
and check monitor “VHCL/S SE-A/T”, “ACCELE POSI” and “SLCT LVR POSI”.
3. Touch “START”.
4. Start engine and maintain the following conditions for at least 10 consecutive seconds.
VHCL/S SE-A/T: 10 km/h (6 MPH) or more
ACCELE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
5. If DTC is detected, go to AT-112, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001327208
1.CHECK CAN COMMUNICATION LINE
With CONSULT-III
 Perform the self-diagnosis.
Without CONSULT-III
 Perform the self-diagnosis. Refer to AT-91, "
Diagnosis Procedure without CONSULT-III".
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to AT- 9 4.
NO >> GO TO 2.
2.CHECK DTC WITH TCM
With CONSULT-III
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
Item name Condition Display value
ENGINE SPEED Engine running Closely matches the tachometer reading.
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AT-242
< SERVICE INFORMATION >
TRANSMISSION ASSEMBLY
10. Remove crankshaft position sensor (POS) from A/T assembly.CAUTION:
 Do not subject it to impact by dropping or hitting it.
 Do not disassemble.
 Do not allow metal filings, etc. to get on the sensor's front
edge magnetic area.
 Do not place in an area affected by magnetism.
11. Remove starter motor. Refer to SC-14, "
Removal and Installa-
tion [VQ35DE Engine Models (2WD)]".
12. Remove fluid cooler tube.
13. Remove rear plate cover. Refer to EM-30, "
Removal and Instal-
lation (2WD Models)".
14. Remove rear cover plate. Refer to EM-30, "
Removal and Installation (2WD Models)".
15. Turn crankshaft, and remove the four tightening bolts for drive plate and torque converter.
CAUTION:
When turning crankshaft, turn it clockwise as viewed from
the front of the engine.
16. Support A/T assembly with a transmission jack. CAUTION:
When setting the transmission j ack, be careful not to allow
it to collide agai nst the drain plug.
17. Remove rear engine mounting member with power tool.
18. Remove engine mounting insulator (rear).
19. Remove air breather hose. Refer to AT-239, "
Removal and Installation".
20. Disconnect A/T assembly harness connector.
21. Remove A/T fluid charging pipe from A/T assembly.
22. Remove O-ring from A/T fluid charging pipe.
23. Plug up openings such as the A/T fluid charging pipe hole, etc.
24. Remove bolts fixing A/T assembly to engine assembly with power tool.
25. Remove A/T assembly from vehicle with a transmission jack. Secure torque converter to prevent it from dropping.
 Secure A/T assembly to a transmission jack.
INSPECTION
Installation and Inspection of Torque Converter
 After inserting a torque converter to a A/T, be sure to check dis-
tance “A” to ensure it is within the reference value limit.
SCIA2155E
SCIA2288E
SCIA0499E
Distance “A” : 25.0 mm (0.98 in) or more
SAT017B
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AT-246
< SERVICE INFORMATION >
TRANSMISSION ASSEMBLY
11. Remove crankshaft position sensor (POS) from A/T assembly.CAUTION:
 Do not subject it to impact by dropping or hitting it.
 Do not disassemble.
 Do not allow metal filings, et c., to get on the sensor's front
edge magnetic area.
 Do not place in an area affected by magnetism.
12. Remove starter motor. Refer to SC-15, "
Removal and Installa-
tion [VQ35DE Engine Models (AWD)]" (for VQ35DE) or SC-13,
"Removal and Installation (VK45DE Engine Models)" (for
VK45DE).
13. Disconnect fluid cooler tube from A/T assembly.
14. Remove rear plate cover. Refer to EM-36, "
Removal and Instal-
lation (AWD Models)" (for VQ35DE) or EM-183, "Removal and
Installation" (for VK45DE).
15. Turn crankshaft, and remove the four tightening bolts for drive plate and torque converter.
CAUTION:
When turning crankshaft, turn it clockwise as viewed from
the front of the engine.
16. Remove dynamic damper (for VQ35DE). Refer to EM-117,
"Removal and Installation (AWD Models)".
17. Support A/T assembly with a transmission jack. CAUTION:
When setting the transmission j ack, be careful not to allow
it to collide agai nst the drain plug.
18. Remove rear engine mounting member with power tool.
19. Remove engine mounting insulator (rear).
20. Tilt the A/T assembly slightly to keep the clearance between body and A/T assembly, and then disconnect air breather hose
from A/T fluid charging pipe. Refer to AT-239, "
Removal and
Installation".
21. Disconnect A/T assembly harness connector and transfer assembly harness connector.
22. Remove A/T fluid charging pipe.
23. Remove O-ring from A/T fluid charging pipe.
24. Plug up openings such as the A/T fluid charging pipe hole, etc.
25. Remove bolts fixing transmission assembly to engine with power tool.
SCIA2011E
SCIA5326E
SCIA2010E
SCIA2202E
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INTELLIGENT KEY SYSTEMBL-109
< SERVICE INFORMATION >
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Mechanical Key Operation Inspection
WARNING CHIME FUNCTION MALFUNCTION
Before conducting the diagnosis in the following table, c
heck “key reminder function” with power door lock sys-
tem.
Symptom Diagnoses service procedure Refer to page
Ignition knob can not turn
KEY warning lamp on combination meter
lights up in red when ignition knob is
pressed. (door lock functions normal) 1. Intelligent Key battery inspection
BL-130
2. Check inside key antennaBL-123
3. Replace Intelligent Key unitBL-130
KEY warning lamp on combination meter
lights up in green when ignition knob is
pressed.1. Check ignition knob switch
BL-1142. Check steering lock unitBL-124
3. Check Intelligent Key unit power supply and ground circuit B L - 111
4. Replace Intelligent Key unitBL-130
Ignition knob turns even without both Intelli-
gent Key and mechanical key.Replace steering lock unit —
Security indicator will still flash when ignition
knob is pressed. 1. Check key switch (Intelligent Key unit input)
BL-112
2. Replace Intelligent Key unitBL-130
Security indicator does not flash with ignition
knob released at LOCK position. (push
switch OFF)1. CAN communication system
BCS-13
2. Ignition knob switch system BL-114
3. Intelligent Key unit power supply and ground circuit B L - 111
Starter motor does not cranking.
(Ignition knob can turn)1. Check detention switch
BL-1262. Check stop lamp switchBL-126
3. Replace Intelligent Key unitBL-130
Symptom Diagnoses service procedure Refer to page
Ignition knob can not turn
Security indicator remains flashing with me-
chanical key inserted.1. Check key switch (BCM input)
BL-113
2. Replace Intelligent Key unitBL-130
KEY indicator and security indicator does
not flashing with mechanical key inserted. 1. Check stop lamp switch
BL-126
2. Replace Intelligent Key unitBL-130
Starter motor does not cranking.
(Ignition knob can turn)1. Check detention switch
BL-1262. Check stop lamp switchBL-126
3. Replace Intelligent Key unitBL-130
Symptom Diagnoses service procedure Refer to page
Ignition key warning chime is inoperative.
(When mechanical key used) 1. Check CAN communication
BCS-13
2. Check key switch (Intelligent Key unit input) BL-112
3. Check door switchBL-115
4. Inspect combination meter (warning) DI-5
5. Replace Intelligent Key unitBL-130
Ignition knob OFF position warning chime
(for inside vehicle) does not sound.
(Ignition key warning chime operates)1. Check CAN communication
BCS-132. Check ignition knob switch BL-114
3. Check key switch (Intelligent Key unit input)BL-112
4. Replace Intelligent Key unitBL-130
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EC-32
< SERVICE INFORMATION >[VQ35DE]
ENGINE CONTROL SYSTEM
*1: This sensor is not used to control the engine system under normal conditions.
*2: This signal is sent to the ECM through CAN communication line.
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is
determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). T he amount of fuel injected is a program value in the
ECM memory. The program value is preset by engi ne operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air
flow sensor.
VARIOUS FUEL INJECTION I NCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compens ated to improve engine performance under various operat-
ing conditions as listed below.
 During warm-up
 When starting the engine
 During acceleration
 Hot-engine operation
 When selector lever is changed from N to D
 High-load, high-speed operation
 During deceleration
 During high engine speed operation
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
The mixture ratio feedback system prov ides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst 1 can then better reduce CO, HC and NOx emissions. This system uses air fuel ratio
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS) Engine speed*
3
Piston position
Fuel injection
& mixture ratio
controlFuel injector
Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Air fuel ratio (A/F) sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Park/neutral position (PNP) switch Gear position
Knock sensor Engine knocking condition
Battery
Battery voltage*
3
Power steering pressure sensor Power steering operation
Heated oxygen sensor 2*
1Density of oxygen in exhaust gas
Air conditioner switch Air conditioner operation*
2
Wheel sensorVehicle speed*2
PBIB3020E
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EC-34
< SERVICE INFORMATION >[VQ35DE]
ENGINE CONTROL SYSTEM
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration,
operation of the engine at excessively high speeds or oper-
ation of the vehicle at excessively high speeds.
Electronic Ignition (EI) SystemINFOID:0000000001325897
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
Firing order: 1 - 2 - 3 - 4 - 5 - 6
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor (PHASE) sig-
nal. Computing this information, ignition si gnals are transmitted to the power transistor.
During the following conditions, the ignition timing is re vised by the ECM according to the other data stored in
the ECM.
 At starting
 During warm-up
 At idle
 At low battery voltage
 During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.
Fuel Cut Control (at No Load and High Engine Speed)INFOID:0000000001325898
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS) Engine speed*
2
Piston position
Ignition timing
controlPower transistor
Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Knock sensor Engine knocking
Park/neutral position (PNP) switch Gear position
Battery
Battery voltage*
2
Wheel sensor
Vehicle speed*1
Sensor Input Signal to ECM ECM function Actuator
Park/neutral position (P NP) switch Neutral position
Fuel cut control Fuel injector
Accelerator pedal position sensor Accelerator pedal position
Engine coolant temperature sensor Engine coolant temperature
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Wheel sensor Vehicle speed*
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EC-36
< SERVICE INFORMATION >[VQ35DE]
AIR CONDITIONING CUT CONTROL
AIR CONDITIONING CUT CONTROL
Input/Output Signal ChartINFOID:0000000001325899
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
System DescriptionINFOID:0000000001325900
This system improves engine operati
on when the air conditioner is used.
Under the following conditions, the air conditioner is turned OFF.
 When the accelerator pedal is fully depressed.
 When cranking the engine.
 At high engine speeds.
 When the engine coolant temperature becomes excessively high.
 When operating power steering during low engine speed or low vehicle speed.
 When engine speed is excessively low.
 When refrigerant pressure is excessively low or high.
Sensor Input Signal to ECM ECM function Actuator
Air conditioner switch Air conditioner ON signal*
1
Air conditioner
cut controlAir conditio
ner relay
Accelerator pedal position sensor Accelerator pedal position
Throttle position sensor Throttle position
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*2
Engine coolant temperature sensor Engine coolant temperature
Battery
Battery voltage*
2
Refrigerant pressure sensor Refrigerant pressure
Power steering pressure sensor Power steering operation
Wheel sensorVehicle speed*
1
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