Toyota ZZT230 series, Repair Manual

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Dl--136
DTC P1656 OCV Circuit Malfunction
CIRCUIT DESCRIPTION
Refer to DTC P1349 (VVT System Malfunction) on page Dl-123
DTC No. DTC Detecting Condition
Trouble Area
P1656
•Open or short In oil control valve circuit
P1663
Open
or
short in oil oontrol valve circtJit •Oll control valve
•ECM
WIRING DIAGRAM
Refer to DTC P1349
(VVT
System Malfunction) on page Dl-123 for the
WIRING DIAGRAM.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or
080
II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting
it
is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.
TOYOTA
hand-held tester
1 Check OCV circuit.
PREPARATION:
(a) Start the engine and warmed it up.
(b) Connect the TOYOTA hand-held tester and select VVT from ACTIVE TEST menu.
CHECK:
Check the engine speed when operate the OCV by the TOYOTA hand-held tester.
OK:
VVT
system Is OFF (OCV Is OFF):
Normal engine speed
VVT
system Is ON (OCV Is ON):
Rough Idle or engine stalled
page 01-3).