Infiniti I35 (A33). Manual — part 206
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Description
NHEC0821
SYSTEM DESCRIPTION
NHEC0821S01
Sensor
Input signal to ECM function
ECM
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Intake valve
timing con-
trol
Intake valve timing control sole-
noid valve
Engine coolant temperature sensor
Engine coolant temperature
Vehicle speed sensor
Vehicle speed
SEC419D
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake
valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant
temperature. Then, the ECM sends ON/OFF pulse duty signals to the camshaft timing control valve depend-
ing on driving status. This makes it possible to control the shut/open timing of the intake valve to increase
engine torque in low/mid speed range and output in high-speed range.
COMPONENT DESCRIPTION
NHEC0821S02
PBIB1842E
Intake valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil amount and direction of flow through intake valve
timing control unit or stops oil flow.
The longer pulse width advantages valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake
valve angle at the control position.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0011, P0021 IVT CONTROL
Description
EC-165
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CONSULT-II Reference Value in Data Monitor
Mode
NHEC0822
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
INT/V TIM (B1)
INT/V TIM (B2)
I
Engine: After warming up
I
Shift lever N
I
Quickly depressed accelerator
pedal
I
No-load
Idle
−5 - 5° CA
2,000 rpm
Approximately 0 - 30° CA
INT/V SOL (B1)
INT/V SOL (B2)
I
Engine: After warming up
I
Shift lever N
I
Quickly depressed accelerator
pedal
I
No-load
Idle
0 - 2%
2,000 rpm
Approximately 25 - 50%
On Board Diagnosis Logic
NHEC0824
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P0011
0011
(Bank 1)
P0021
0021
(Bank 2)
Intake valve timing
control performance
There is a gap between angle of target and
phase-control angle degree.
I
Harness or connectors
(Intake valve timing control solenoid
valve circuit is open or shorted.)
I
Intake valve timing control solenoid
valve
I
Crankshaft position sensor (POS)
I
Camshaft position sensor (PHASE)
I
Accumulation of debris to the signal
pick-up portion of the camshaft
FAIL-SAFE MODE
NHEC0824S01
When the malfunction is detected, the ECM enters fail-safe mode.
Detected items
Engine operating condition in fail-safe mode
Intake valve timing control
The signal is not energized to the solenoid valve and the valve control does not function.
DTC Confirmation Procedure
NHEC0825
CAUTION:
Always drive at a safe speed.
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.
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is between 10V and 16V at idle.
DTC P0011, P0021 IVT CONTROL
CONSULT-II Reference Value in Data Monitor Mode
EC-166
![](/vehicles/zatt/ltherawowha/yose/eahe.png)
SEF353Z
WITH CONSULT-II
NHEC0825S03
1)
Turn ignition switch ON.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Maintain the following conditions for at least 20 conecutive
seconds.
ENG SPEED
1,700 - 3,175 rpm (A constant rotation
is maintained.)
COOLANT TEMPS
70 - 105°C (158 - 221°F)
Selector lever
1st position
Driving location
Driving vehicle uphill
(Increased engine load will help main-
tain the driving conditions required for
this test.)
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-171.
WITH GST
NHEC0825S04
Follow the procedure “WITH CONSULT-II” above.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0011, P0021 IVT CONTROL
DTC Confirmation Procedure (Cont’d)
EC-167
![](/vehicles/zatt/ltherawowha/yose/mulff.png)
Wiring Diagram
=NHEC1409
BANK 1
MEC575D
DTC P0011, P0021 IVT CONTROL
Wiring Diagram
EC-168
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