Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg cip1656
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DI-134
DIAGNOSTICS - ENGINE
DI6VO-04
DTC P1656 OCV Circuit Malfunction
CIRCUIT DESCRIPTION
Refer to DTC P1349 (VVT System Malfunction) on page DI-122 .
DTC No. DTC Detecting Condition Trouble Area
S Open or short in oil control valve circuit
P1656
Open or short in oil control valve circuit S Oil control valve
P1663
S ECM
WIRING DIAGRAM
Refer to DTC P1349 (VVT System Malfunction) on page DI-122 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
HINT:
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 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
OK Check for intermittent problems
(See page DI-3 ).
NG
2002 ECHO (RM884U)
Author : Date : 304
DI-135
DIAGNOSTICS - ENGINE
2 Check operation of OCV.
START PREPARATION:
(a) Start the engine and warmed it up.
(b) Disconnect the OCV connector.
(c) Apply battery positive voltage between terminals of the
OCV.
CHECK:
Check the engine speed.
OK:
BE6653 Rough idle or engine stalled.
A09112 A09115
NG Replace OCV.
OK
3 Check voltage between terminals OCV+ and OCV- of ECM connector
(See page DI-122 ).
NG Check and replace ECM (See page IN-29 ).
OK
4 Check for open and short in harness and connector between OCV and ECM
(See page IN-29 ).
NG Repair or replace.
OK
Check for intermitent problems
(See page DI-3 ).
2002 ECHO (RM884U)
Author : Date : 305
DI-136
DIAGNOSTICS - ENGINE
OBD II scan tool (excluding TOYOTA hand-held tester)
1 Check operation of OCV.
START PREPARATION:
(a) Start the engine and warmed it up.
(b) Disconnect the OCV connector.
(c) Apply battery positive voltage between terminals of the
OCV.
CHECK:
Check the engine speed.
OK:
BE6653 Rough idle or engine stalled
A09112 A09115
NG Replace OCV.
OK
2 Check voltage between terminals OCV+ and OCV- of ECM connector
(See page DI-122 ).
NG Check and replace ECM (See page IN-29 ).
OK
3 Check for open and short in harness and connector between OCV and ECM
(See page IN-29 ).
NG Repair or replace.
OK
Check for intermitent problems
(See page DI-3 ).
2002 ECHO (RM884U)
Author : Date : 306
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