ignition INFINITI FX35 2006 Service Manual

EC-748
[VK45DE]
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
TROUBLE DIAGNOSISPFP:00004
Trouble Diagnosis IntroductionNBS0041X
INTRODUCTION
The engine has an ECM to control major systems such as fuel con-
trol, ignition control, idle air control system, etc. The ECM accepts
input signals from sensors and instantly drives actuators. It is essen-
tial that both input and output signals are proper and stable. At the
same time, it is important that there are no malfunctions such as vac-
uum leaks, fouled spark plugs, or other malfunctions with the engine.
It is much more difficult to diagnose an incident that occurs intermit-
tently rather than continuously. Most intermittent incidents are
caused by poor electric connections or improper wiring. In this case,
careful checking of suspected circuits may help prevent the replace-
ment of good parts.
A visual check only may not find the cause of the incidents. A road
test with CONSULT-II (or GST) or a circuit tester connected should
be performed. Follow the Work Flow on EC-749
.
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such incidents, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A Diagnostic Worksheet like the example
on EC-753
should be used.
Start your diagnosis by looking for conventional malfunctions first.
This will help troubleshoot driveability malfunctions on an electroni-
cally controlled engine vehicle.
MEF036D
SEF233G
SEF234G

EC-756
[VK45DE]
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
Fail-Safe ChartNBS004JX
When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when
there is malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected
as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by
means of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands
the driver to repair the malfunction.
DTC No. Detected items Engine operating condition in fail-safe mode
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 time after turning
ignition switch ON or START.
CONSULT-II displays the engine coolant temperature decided by ECM.
Condition Engine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned
ON or START 40
°C (104 °F)
More than approx. 4 minutes after
ignition ON or START 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.
So, the acceleration will be poor.
P0643 Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P2100
P2103 Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2101 Electric throttle control function ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2118 Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P2119 Electric throttle control actuator (When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops,
the engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or
more.
P2122
P2123
P2127
P2128
P2138 Accelerator pedal 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.
So, the acceleration will be poor.
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut

TROUBLE DIAGNOSIS EC-757
[VK45DE]
C
D E
F
G H
I
J
K L
M A
EC
Revision: 2006 December 2006 FX35/FX45
Symptom Matrix ChartNBS00420
SYSTEM — BASIC ENGINE CONTROL SYSTEM
SYMPTOM Reference
page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Fuel Fuel pump circuit 11232 22 3 2 EC-1314
Fuel pressure regulator system334444444 4 EC-746
Fuel injector circuit 11232 22 2 EM-194
Evaporative emission system334444444 4 EC-699
Air Positive crankcase ventilation sys-
tem 33 4444444 41
EC-711
Incorrect idle speed adjustment 1 1 1 1 1 EC-737
Electric throttle control actuator 112332222 2 2 EC-1240,
EC-1252
IgnitionIncorrect ignition timing adjustment33111 11 1 EC-737
Ignition circuit 11222 22 2EC-1328
Main power supply and ground circuit22333 33 23 EC-812
Mass air flow sensor circuit
1
12 2
222 2 EC-858,
EC-867
,
Engine coolant temperature sensor circuit
3 33
EC-879
,
EC-892
A/F sensor 1 circuit EC-900
,
EC-910
,
EC-919
,
EC-928
,
EC-1283
Throttle position sensor circuit
22 EC-885
,
EC-1008
,
EC-1183
,
EC-1185
,
EC-1268
Accelerator pedal position sensor circuit 3 2 1 EC-1149
,
EC-1254
,
EC-1261
,
EC-1275
Knock sensor circuit 2 3 EC-1025
Crankshaft position sensor (POS) circuit 2 2EC-1030
Camshaft position sensor (PHASE) circuit 3 2EC-1037
Vehicle speed signal circuit 2 3 3 3EC-1131
Power steering pressure sensor circuit 2 3 3EC-1137

TROUBLE DIAGNOSIS EC-761
[VK45DE]
C
D E
F
G H
I
J
K L
M A
EC
Revision: 2006 December 2006 FX35/FX45
Engine Control Component Parts LocationNBS00421
1. IPDM E/R 2. ICC brake hold relay (ICC models only) 3. Refrigerant pressure sensor
4. Intake valve timing control position sensor (bank 2) 5. Intake valve timing control solenoid
valve (bank 2) 6. Electric throttle control actuator
7. Cooling fan motor 8. Intake valve timing control solenoid valve (bank 1) 9. Intake valve timing control position
sensor (bank 1)
10. Camshaft position sensor (PHASE) 11. Mass air flow sensor (with intake air temperature sensor) 12. Ignition coil (with power transistor)
and spark plug (bank 1)
13. Vacuum tank 14. VIAS control solenoid valve 15. Engine coolant temperature sensor
16. Fuel injector (bank 1) 17. Power valve actuator 18. Knock sensor (bank 1)
19. Knock sensor (bank 2) 20. Fuel injector (bank 2) 21. EVAP canister purge volume control solenoid valve
22. EVAP service port 23. Ignition coil (with power transistor) and spark plug (bank 2)
PBIB3224E

TROUBLE DIAGNOSIS EC-763
[VK45DE]
C
D E
F
G H
I
J
K L
M A
EC
Revision: 2006 December 2006 FX35/FX45
: Vehicle front
1. Intake valve timing control position sensor (bank 2) 2. Intake valve timing control solenoid
valve (bank 2) 3. Intake valve timing control solenoid
valve (bank 1)
4. Intake valve timing control position sensor (bank 1) 5. Electric throttle control actuator 6. Condenser
7. Ignition coil (with power transistor) (bank 2) 8. Ignition coil (with power transistor)
(bank 1)
PBIB3226E

EC-772
[VK45DE]
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
3P Throttle control motor relay
power supply [Ignition switch: ON] BATTERY VOLTAGE
(11 - 14V)
4L/W Throttle control motor
(Close) [Ignition switch: ON]

Engine stopped

Selector lever: D

Accelerator pedal: Fully released 0 - 14V
5L/B Throttle control motor
(Open) [Ignition switch: ON]

Engine stopped

Selector lever: D

Accelerator pedal: Fully depressed 0 - 14V
6R Heated oxygen sensor 2
heater (bank 1) [Engine is running]

Engine speed: Below 3,600 rpm after 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 0 - 1.0V
[Ignition switch: ON]

Engine stopped
[Engine is running]

Engine speed: Above 3,600 rpm BATTERY VOLTAGE
(11 - 14V)
10 OR Intake valve timing control
solenoid valve (bank 1) [Engine is running]

Warm-up condition

Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Warm-up condition

Engine speed: 2,000rpm 7 - 12V
11 B R Intake valve timing control
solenoid valve (bank 2) [Engine is running]

Warm-up condition

Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Warm-up condition

Engine speed: 2,000rpm 7 - 12V
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
PBIB1104E
PBIB1105E
PBIB1790E
PBIB1790E

EC-774
[VK45DE]
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
21
22
23
40
41
42
44
63 W
R
P
PU
BR
B
OR
G Fuel injector No. 5
Fuel injector No. 3
Fuel injector No. 1
Fuel injector No. 6
Fuel injector No. 4
Fuel injector No. 2
Fuel injector No. 7
Fuel injector No. 8 [Engine is running]

Warm-up condition

Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle BATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Warm-up condition

Engine speed: 2,000 rpm BATTERY VOLTAGE
(11 - 14V)
24 P A/F sensor 1 heater
(bank 2) [Engine is running]

Warm-up condition

Idle speed Approximately 5V
25 P Heated oxygen sensor 2
heater (bank 2) [Engine is running]

Engine speed: Below 3,600 rpm after 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 0 - 1.0V
[Ignition switch: ON]

Engine stopped
[Engine is running]

Engine speed: Above 3,600 rpm BATTERY VOLTAGE
(11 - 14V)
29 GY VIAS control solenoid valve [Engine is running]

Selector lever: P or N
0 - 1.0V
[Engine is running]

Selector lever: D

Engine speed: Below 5,000 rpm BATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Engine speed: Above 5,000 rpm 0 - 1.0V
32 OR EVAP control system pres-
sure sensor [Ignition switch: ON]
Approximately 1.8 - 4.8V
34 Y Intake air temperature sen-
sor [Engine is running] Approximately 0 - 4.8V
Output voltage varies with intake
air temperature.
36 W Knock sensor (bank 2) [Engine is running]

Idle speedApproximately 2.5V
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
PBIB0042E
PBIB0043E
PBIB1584E

TROUBLE DIAGNOSIS EC-775
[VK45DE]
C
D E
F
G H
I
J
K L
M A
EC
Revision: 2006 December 2006 FX35/FX45
45 W EVAP canister purge vol-
ume control solenoid valve [Engine is running]

Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]

Engine speed: About 2,000 rpm (More than
100 seconds after starting engine) 11 - 1 4 V
46
60
61
62
65
79
80
81 BR
SB
L
Y
P
LG
GY
G Ignition signal No. 7
Ignition signal No. 5
Ignition signal No. 3
Ignition signal No. 1
Ignition signal No. 8
Ignition signal No. 6
Ignition signal No. 4
Ignition signal No. 2 [Engine is running]

Warm-up condition

Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle 0 - 0.2V
[Engine is running]

Warm-up condition

Engine speed: 2,000 rpm 0.1 - 0.4V
47 L Sensor power supply
(Throttle position sensor) [Ignition switch: ON]
Approximately 5V
48 L Sensor power supply
(EVAP control system pres-
sure sensor) [Ignition switch: ON]
Approximately 5V
49 PU Sensor power supply
(Refrigerant pressure sen-
sor) [Ignition switch: ON]
Approximately 5V
50 W Throttle position sensor 1 [Ignition switch: ON]

Engine stopped

Selector lever: D

Accelerator pedal: Fully released
More than 0.36V
[Ignition switch: ON]

Engine stopped

Selector lever: D

Accelerator pedal: Fully depressed Less than 4.75V
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
PBIB0050E
PBIB0051E
PBIB0044E
PBIB0045E

EC-776
[VK45DE]
TROUBLE DIAGNOSIS
Revision: 2006 December 2006 FX35/FX45
51 L/W Mass air flow sensor [Engine is running]

Warm-up condition

Idle speed
1.0 - 1.3V
[Engine is running]

Warm-up condition

Engine speed: 2,500 rpm 1.6 - 2.0V
53 R/L Intake valve timing control
position sensor (bank 2) [Engine is running]

Warm-up condition

Idle speed
0 - 1.0V
[Engine is running]

Engine speed: 2,000 rpm 0 - 1.0V
55 W/R Heated oxygen sensor 2
(bank 1) [Engine is running]

Revving engine from idle to 3,000 rpm
quickly after the following conditions are met
–Engine: After warming up
–After keeping the engine speed between
3,500 and 4,000 rpm for 1 minute and at idle
for 1 minute under no load 0 - Approximately 1.0V
57 G A/F sensor 1 (bank 2) [Engine is running]

Warm-up condition

Idle speed Approximately 2.6V
58 L Approximately 2.3V
76 R Approximately 3.1V
77 OR Approximately 2.3V
66 B Sensor ground
(Throttle position sensor) [Engine is running]

Warm-up condition

Idle speed
Approximately 0V
67 B/W Sensor ground [Engine is running]

Warm-up condition

Idle speed Approximately 0V
68 SB Sensor power supply
(Power steering pressure
sensor) [Ignition switch: ON]
Approximately 5V
69 R Throttle position sensor 2 [Ignition switch: ON]

Engine stopped

Selector lever: D

Accelerator pedal: Fully released
Less than 4.75V
[Ignition switch: ON]

Engine stopped

Selector lever: D

Accelerator pedal: Fully depressed More than 0.36V
70 L/R Refrigerant pressure sensor [Engine is running]

Warm-up condition

Both A/C switch and blower fan motor
switch: ON (Compressor operates) 1.0 - 4.0V
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
PBIB2046E

TROUBLE DIAGNOSIS EC-777
[VK45DE]
C
D E
F
G H
I
J
K L
M A
EC
Revision: 2006 December 2006 FX35/FX45
72 BR Intake valve timing control
position sensor (bank 1) [Engine is running]

Warm-up condition

Idle speed
0 - 1.0V
[Engine is running]

Engine speed: 2,000rpm 0 - 1.0V
73 GY Engine coolant temperature
sensor [Engine is running] Approximately 0 - 4.8V
Output voltage varies with
engine coolant temperature.
74 LG/B Heated oxygen sensor 2
(bank 2) [Engine is running]

Revving engine from idle to 3,000 rpm
quickly after the following conditions are met
–Engine: After warming up
–After keeping the engine speed between
3,500 and 4,000 rpm for 1 minute and at idle
for 1 minute under no load 0 - Approximately 1.0V
78 B/R Sensor ground
(Heated oxygen sensor 2) [Engine is running]

Warm-up condition

Idle speed
Approximately 0V
82 B/W Sensor ground
(APP sensor 1 / ICC steer-
ing switch / ASCD steering
switch) [Engine is running]

Warm-up condition

Idle speed
Approximately 0V
83 G/OR Sensor ground
(APP sensor 2) [Engine is running]

Warm-up condition

Idle speed
Approximately 0V
85 PU Data link connector [Ignition switch: ON]

CONSULT-II or GST: Disconnected Approximately 5V - Battery volt-
age (11 - 14V)
86 P CAN communication line [Ignition switch: ON] Approximately 1.1 - 2.3V
Output voltage varies with the
communication status.
90 L/B Sensor power supply
(APP sensor 1) [Ignition switch: ON]
Approximately 5V
91 G Sensor power supply
(APP sensor 2) [Ignition switch: ON]
Approximately 5V
94 L CAN communication line [Ignition switch: ON] Approximately 2.6 - 3.2V
Output voltage varies with the
communication status.
98 Y/R Accelerator pedal position
sensor 2 [Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully released
0.15 - 0.60V
[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully depressed 1.95 - 2.40V
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
PBIB2046E