Nissan Xterra. Instruction — part 257
EC-154
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
U1001 CAN COMM CIRCUIT
U1001 CAN COMM CIRCUIT
Description
INFOID:0000000009483830
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
On Board Diagnosis Logic
INFOID:0000000009483831
The MIL will not illuminate for this diagnosis.
DTC Confirmation Procedure
INFOID:0000000009483832
1. Turn ignition switch ON and wait at least 3 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000009483833
Go to
LAN-45, "CAN System Specification Chart"
.
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
U1001
1001
CAN communication
line
• When ECM is not transmitting or receiving
CAN communication signal other than OBD
(emission-related diagnosis) for 2 seconds or
more.
• Harness or connectors
(CAN communication line is open or
shorted)
P0011, P0021 IVT CONTROL
EC-155
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P0011, P0021 IVT CONTROL
On Board Diagnosis Logic
INFOID:0000000009483834
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode.
DTC Confirmation Procedure
INFOID:0000000009483835
CAUTION:
Always drive at a safe speed.
NOTE:
• If DTC P0011 or P0021 is displayed with DTC P0075 or P0081, first perform trouble diagnosis for DTC
P0075 or P0081. Refer to
EC-165, "Component Description"
.
• If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next step.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10V and 16V at
idle.
WITH CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Maintain the following conditions for at least 14 consecutive seconds. Hold the accelerator pedal as
steady as possible.
4. Stop vehicle with engine running and let engine idle for 10 seconds.
5. Check 1st trip DTC.
6. If the 1st trip DTC is detected, go to
.
If the 1st trip DTC is not detected, go to next step.
7. Maintain the following conditions for at least 20 consecutive seconds.
DTC No.
Trouble diagnosis
name
Detecting condition
Possible cause
P0011
0011
(Bank 1)
Intake valve timing
control performance
There is a gap between angle of target and
phase-control angle degree.
• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE)
• Intake valve timing control solenoid valve
• Accumulation of debris to the signal pick-up
portion of the camshaft
• Timing chain installation
• Foreign matter caught in the oil groove for in-
take valve timing control
P0021
0021
(Bank 2)
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.
ENG SPEED
1,200 - 2,000 rpm
COOLAN TEMP/S
More than 60
°C (140°F)
B/FUEL SCHDL
More than 3.5 msec
Selector lever
P or N position (A/T)
Neutral position (M/T)
EC-156
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0011, P0021 IVT CONTROL
8. Check 1st trip DTC.
9. If the 1st trip DTC is detected, go to
.
WITH GST
Follow the procedure “WITH CONSULT” above.
Diagnosis Procedure
INFOID:0000000009483836
1.
CHECK OIL PRESSURE WARNING LAMP
1. Start engine.
2. Check oil pressure warning lamp and confirm it is not illumi-
nated.
OK or NG
OK
>> GO TO 2.
KG
>> Go to
.
2.
CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
EC-157, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace malfunctioning intake valve timing control solenoid valve. Refer to
3.
CHECK CRANKSHAFT POSITION SENSOR (POS)
EC-277, "Component Inspection"
OK or NG
OK
>> GO TO 4.
NG
>> Replace crankshaft position sensor (POS). Refer to
TM-250, "Removal and Installation (2WD)"
(5AT),
TM-21, "Removal and Installation from Vehicle"
4.
CHECK CAMSHAFT POSITION SENSOR (PHASE)
EC-280, "Component Inspection"
OK or NG
OK
>> GO TO 5.
NG
>> Replace malfunctioning camshaft position sensor (PHASE). Refer to
5.
CHECK CAMSHAFT (INTAKE)
Check the following.
ENG SPEED
1,700 - 3,175 rpm (A constant rotation is maintained.)
COOLAN TEMP/S
More than 70
°C (158°F)
Selector lever
1st or 2nd position
Driving location uphill
Driving vehicle uphill
(Increased engine load will help maintain the driving
conditions required for this test.)
PBIA8559J
P0011, P0021 IVT CONTROL
EC-157
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
• Accumulation of debris on the signal plate of camshaft rear end
• Chipping signal plate of camshaft rear end
OK or NG
OK
>> GO TO 6.
NG
>> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft. Refer to
6.
CHECK TIMING CHAIN INSTALLATION
Check service records for any recent repairs that may cause timing chain misalignment.
Are there any service records that may cause timing chain misalignment?
Yes or No
Yes
>> Check timing chain installation. Refer to
EM-59, "Removal and Installation"
No
>> GO TO 7.
7.
CHECK LUBRICATION CIRCUIT
OK or NG
OK
>> GO TO 8.
NG
>> Clean lubrication line.
8.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009483837
INTAKE VALVE TIMING CONTROL SOLENOID VALVE
1. Disconnect intake valve timing control solenoid valve harness connector.
2. Check resistance between intake valve timing control solenoid valve as follows.
If NG, replace intake valve timing control solenoid valve. Refer to
.
If OK, go to next step.
3. Remove intake valve timing control solenoid valve.
4. Provide 12V DC between intake valve timing control solenoid
valve terminals and then interrupt it. Check that the plunger
moves as shown in the figure.
CAUTION:
Never apply 12V DC continuously for 5 seconds or more.
Doing so may result in damage to the coil in intake valve
timing control solenoid valve.
If NG, replace intake valve timing control solenoid valve.
NOTE:
Always replace O-ring when intake valve timing control
solenoid valve is removed.
SEC905C
Terminal
Resistance
1 and 2
7.0 - 7.7
Ω at 20°C (68°F)
1 or 2 and ground
∞Ω
(Continuity should not exist.)
JMBIA0079ZZ
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