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
EC-340, "DTC Logic"
.
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