Infiniti G35 (V35) Sedan. Manual — part 550
EC-346
< COMPONENT DIAGNOSIS >
[VQ35HR]
P1078, P1084 EVT CONTROL POSITION SENSOR
P1078, P1084 EVT CONTROL POSITION SENSOR
Description
INFOID:0000000000956730
Exhaust valve timing control position sensor detects the concave
groove of the exhaust camshaft rear end.
This sensor signal is used for sensing a position of the exhaust cam-
shaft.
This sensor uses a Hall IC.
Based on the position of the exhaust camshaft, ECM controls
exhaust valve timing control magnet retarder to optimize the shut/
open timing of exhaust valve for the driving condition.
DTC Logic
INFOID:0000000000956731
DTC DETECTION LOGIC
NOTE:
If DTC P1078 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
JMBIA0064ZZ
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1078
Exhaust valve timing
control position sensor
(bank 1) circuit
An excessively high or low voltage from
the sensor is sent to ECM.
• Harness or connectors
[EVT control position sensor (bank 1) circuit is
open or shorted)
• Exhaust valve timing control position sensor
• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE) (bank 1)
• Accumulation of debris to the signal pick-up
portion of the camshaft
P1084
Exhaust valve timing
control position sensor
(bank 2) circuit
• Harness or connectors
[EVT control position sensor (bank 2) circuit is
open or shorted)
[CKP sensor (POS) circuit is shorted.]
[CMP sensor (PHASE) (bank 2) circuit is short-
ed.]
(Battery current sensor circuit is shorted.)
(APP sensor 2 circuit is shorted.)
(EVAP control system pressure sensor circuit
is shorted.)
(Refrigerant pressure sensor circuit is short-
ed.)
• Exhaust valve timing control position sensor
(bank 2)
• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE) (bank 2)
• Battery current sensor
• Accelerator pedal position sensor
• EVAP control system pressure sensor
• Refrigerant pressure sensor
• Accumulation of debris to the signal pick-up
portion of the camshaft
P1078, P1084 EVT CONTROL POSITION SENSOR
EC-347
< COMPONENT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and let it idle for 10 seconds.
2.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000000956732
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to Ground Inspection in
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-I
1.
Disconnect exhaust valve timing control position sensor harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between exhaust valve timing control position sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO-1
>> P1078: Repair open circuit or short to ground or short to power in harness or connectors.
NO-2
>> P1084: GO TO 3.
3.
CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between exhaust valve timing control position sensor harness connector and ECM
harness connector.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit.
4.
CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.
DTC
EVT control position sensor
Ground
Voltage
Bank
Connector
Terminal
P1078
1
F4
1
Ground
Approx. 5V
P1084
2
F19
1
EVT control position sensor
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
2
F19
1
F102
64
Existed
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F101
46
CKP sensor (POS)
F2
1
EC-348
< COMPONENT DIAGNOSIS >
[VQ35HR]
P1078, P1084 EVT CONTROL POSITION SENSOR
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair short to ground or short to power in harness or connectors.
5.
CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (POS) (Refer to
EC-257, "Component Inspection"
• Camshaft position sensor (PHASE) (bank 2) (Refer to
EC-262, "Component Inspection"
• Battery current sensor (Refer to
EC-381, "Component Inspection"
.)
• EVAP control system pressure sensor (Refer to
EC-298, "Component Inspection"
.)
• Refrigerant pressure sensor (Refer to
HAC-92, "Component Inspection"
.)
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace malfunctioning component.
6.
CHECK APP SENSOR
EC-427, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> GO TO 7.
7.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly.
2.
Go to
EC-427, "Special Repair Requirement"
.
>> INSPECTION END
8.
CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR GROUND CIRCUIT FOR OPEN AND
SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between exhaust valve timing control position sensor harness connector and ECM
harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN
AND SHORT
F102
64
CMP sensor (PHASE) (bank 2)
F18
1
EVT control position sensor (bank 2)
F19
1
Battery current sensor
E21
1
M107
103
APP sensor
E112
6
107
EVAP control system pressure sensor
B252
3
111
Refrigerant pressure sensor
E77
3
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
DTC
EVT control position sensor
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P1078
1
F4
2
F102
88
Existed
P1084
2
F19
2
P1078, P1084 EVT CONTROL POSITION SENSOR
EC-349
< COMPONENT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
1.
Check the continuity between exhaust valve timing control position sensor harness connector and ECM
harness connector.
2.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F107, F106
• Harness for open or short between exhaust valve timing control position sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR
EC-350, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Replace malfunctioning exhaust valve timing control position sensor.
12.
CHECK CRANKSHAFT POSITION SENSOR (POS)
EC-257, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace crankshaft position sensor (POS).
13.
CHECK CAMSHAFT POSITION SENSOR (PHASE)
EC-262, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Replace malfunctioning camshaft position sensor (PHASE).
14.
CHECK CAMSHAFT (EXH)
Check the following;
• Accumulation of debris to the signal plate of camshaft rear end
• Chipping signal plate of camshaft rear end
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft.
15.
CHECK INTERMITTENT INCIDENT
GI-39, "Intermittent Incident"
.
>> INSPECTION END
DTC
EVT control position sensor
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P1078
1
F4
3
F102
58
Existed
P1084
2
F19
3
62
JMBIA0059ZZ
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