P1078, P1084 EVT CONTROL POSITION SENSOR
EC-365
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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P1078, P1084 EVT CONTROL POSITION SENSOR
Description
INFOID:0000000005236956
Exhaust valve timing (EVT) control position sensor detects the con-
cave 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:0000000005236957
DTC DETECTION LOGIC
NOTE:
If DTC P1078 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
EC-359, "DTC Logic"
.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
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.
JMBIA0064ZZ
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1078
Exhaust valve timing
(EVT) 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)
• EVT control position sensor
• Crankshaft position (CKP) sensor
• Camshaft position (CMP) sensor (bank 1)
• Accumulation of debris to the signal pick-up
portion of the camshaft
P1084
Exhaust valve timing
(EVT) control position
sensor (bank 2) circuit
• Harness or connectors
[EVT control position sensor (bank 2) circuit is
open or shorted)
(CKP sensor circuit is shorted.)
[CMP sensor (bank 2) circuit is shorted.]
(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.)
• EVT control position sensor (bank 2)
• CKP sensor
• CMP sensor (bank 2)
• Battery current sensor
• Accelerator pedal position (APP) sensor
• EVAP control system pressure sensor
• Refrigerant pressure sensor
• Accumulation of debris to the signal pick-up
portion of the camshaft