DTC Description
DTC DETECTION LOGIC
DTC No. | CONSULT screen terms (Trouble diagnosis content) | DTC detecting condit |
P0078 | EX V/T ACT/CIRC-B1 (Exhaust valve control solenoid circuit bank 1) | An improper voltage is sent to the ECM through exhaust valve timing control solenoid valve. |
POSSIBLE CAUSE
FAIL-SAFE
Device fix mode
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
>> GO TO2.
2.PERFORM DTC CONFIRMATION PROCEDURE
Is 1st trip DTC detected? YES >> Proceed to EC-195, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY
Is the inspection result normal? YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit.
NO >> Repair or replace error-detected parts.
3.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE GROUND CIRCUIT
Is the inspection result normal? YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE
Check the exhaust valve timing control solenoid valve. Refer to EC-183, "Component Inspection".
Is the inspection result normal? YES >> GO TO 5.
NO >> Replace exhaust valve timing control solenoid valve.
5.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
>> INSPECTION END
Component Inspection
1.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE-1
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace exhaust valve timing control solenoid valve. Refer to EM-44, "Exploded View".
2.CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE-2
CAUTION: Do not apply 12 V DC continuously for 5 seconds or more.
Doing so may result in damage to the coil in exhaust valve timing control solenoid valve.
NOTE: Always replace O-ring when exhaust valve timing control solenoid valve is removed.
Is the inspection result normal? YES >> INSPECTION END
NO >> Replace exhaust valve timing control solenoid valve. Refer to EM-44, "Exploded View".
Preparation
Special Service Tools
The actual shape of the tools may differ from those illustrated here.
Tool number
(TechMate No.)
Tool name
Description
—
(165-GR8-1200KIT-NI)
Multitasking battery and electrical diagnostic
station
Testing batteries, starting and ...
Steering wheel
Exploded View
Steering wheel
Removal and Installation
REMOVAL
Set the front wheels and tires in the straight-ahead position.
Remove driver air bag module. Refer to SR-12, "Removal and
Installation"
Remove steering wheel bolt.
Disconnect harn ...
Rear window wiper and washer switch
WARNINGIn freezing temperatures the washer solution
may freeze on the window and obscure
your vision. Warm the rear window
with the defroster before you wash the
rear window.
CAUTION
Do not operate the washer continuously
for more than 30 seconds ...