-
DIAGNOSTICS
ENGINE
DI-137
291
Author:
Date:
DTC
P1656
OCV Circuit Malfunction (bank 1)
DTC
P1663
OCV Circuit Malfunction (bank 2)
CIRCUIT DESCRIPTION
Refer to DTC P1349, P1354 on page
.
DTC No.
DTC Detecting Condition
Trouble Area
P1656
P1663
Open or short in oil control valve circuit
Open or short in OCV circuit
OCV
ECM
WIRING DIAGRAM
Refer to DTC P1349, P1354 on page
.
INSPECTION PROCEDURE
HINT:
If DTC P1656 displayed, check right bank OCV circuit.
If DTC P1663 displayed, check left bank OCV circuit.
Read freeze frame data using TOYOTA hand-held tester or OBD 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 was warmed up or not, the air-fuel
ratio was lean or rich, etc. at the time of the malfunction.
TOYOTA hand-held tester:
1
Check OCV circuit.
PREPARATION:
(a)
Start the engine and warm it up.
(b)
Connect the TOYOTA hand-held tester and select the VVT from the 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
OK
Check for intermittent problems
(See page
).
NG
DI6TC-03
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