Page 737 of 3000
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–451
ES
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - BATTERY)
Page 738 of 3000
ES–4522GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
The ECM constantly uses 5 V from the battery voltages supplied to the +B (BATT) terminal to operate the
microprocessor. The ECM also provides this power to the sensors through the VC output circuit.
When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied
power through the VC circuit are inactivated because the power is not supplied from the VC circuit. Under
this condition, the system does not start up and the MIL does not illuminate even if the system
malfunctions.
HINT:
Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first turned
to the ON position. The MIL goes off when the engine is started.
VC Output Circuit
A116143E36
Page 739 of 3000
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–453
ES
WIRING DIAGRAM
A163161E02
Page 740 of 3000
ES–4542GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
A136097E06
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2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–455
ES
INSPECTION PROCEDURE
(a) Check that the Malfunction Indicator Lamp (MIL) lights
up when turning the ignition switch to the ON position.
OK:
MIL lights up.
OK
NG
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
tester on.
(c) Check the communication between the tester and ECM.
Result
A
B
(a) Disconnect the throttle body connector.
(b) Turn the ignition switch to the ON position.
(c) Check the MIL.
Result
(d) Reconnect the throttle body connector.
A
B
(a) Disconnect the accelerator pedal position sensor
connector.
(b) Turn the ignition switch to the ON position.
(c) Check the MIL.
1CHECK MIL
GO TO MIL CIRCUIT (See page ES-478)
2CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM
Result Proceed to
Communication is possible A
Communication is not possible B
GO TO MIL CIRCUIT (See page ES-478)
3CHECK THROTTLE BODY (CHECK MIL ILLUMINATED)
Result Proceed to
MIL illuminates A
MIL does not illuminate B
REPLACE THROTTLE BODY (See page ES-
493)
4CHECK ACCELERATOR PEDAL ROD (CHECK MIL ILLUMINATED)
Page 742 of 3000

ES–4562GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
Result
(d) Reconnect the accelerator pedal position sensor
connector.
A
B
(a) Disconnect the VVT sensor for intake camshaft bank 1
connector.
(b) Turn the ignition switch to the ON position.
(c) Check the MIL.
Result
(d) Reconnect the VVT sensor for intake camshaft bank 1
connector.
A
B
(a) Disconnect the VVT sensor for exhaust camshaft bank 1
connector.
(b) Turn the ignition switch to the ON position.
(c) Check the MIL.
Result
(d) Reconnect the VVT sensor for exhaust camshaft bank 1
connector.
A
B
Result Proceed to
MIL illuminates A
MIL does not illuminate B
REPLACE ACCELERATOR PEDAL ROD (See
page ES-502)
5CHECK VVT SENSOR FOR INTAKE CAMSHAFT BANK 1 (CHECK MIL ILLUMINATED)
Result Proceed to
MIL illuminates A
MIL does not illuminate B
REPLACE VVT SENSOR FOR INTAKE
CAMSHAFT BANK 1 (See page ES-509)
6CHECK VVT SENSOR FOR EXHAUST CAMSHAFT BANK 1 (CHECK MIL ILLUMINAT E D )
Result Proceed to
MIL illuminates A
MIL does not illuminate B
REPLACE VVT SENSOR FOR EXHAUST
CAMSHAFT BANK 1 (See page ES-509)
Page 743 of 3000

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–457
ES
(a) Disconnect the VVT sensor for intake camshaft bank 2
connector.
(b) Turn the ignition switch to the ON position.
(c) Check the MIL.
Result
(d) Reconnect the VVT sensor for intake camshaft bank 2
connector.
A
B
(a) Disconnect the VVT sensor for exhaust camshaft bank 2
connector.
(b) Turn the ignition switch to the ON position.
(c) Check the MIL.
Result
(d) Reconnect the VVT sensor for exhaust camshaft bank 2
connector.
A
B
(a) Disconnect the canister pump module connector.
(b) Turn the ignition switch to the ON position.
(c) Check the MIL.
Result
(d) Reconnect the canister pump module connector.
A
7CHECK VVT SENSOR FOR INTAKE CAMSHAFT BANK 2 (CHECK MIL ILLUMINATED)
Result Proceed to
MIL illuminates A
MIL does not illuminate B
REPLACE VVT SENSOR FOR INTAKE
CAMSHAFT BANK 2 (See page ES-509)
8CHECK VVT SENSOR FOR EXHAUST CAMSHAFT BANK 2 (CHECK MIL ILLUMINAT E D )
Result Proceed to
MIL illuminates A
MIL does not illuminate B
REPLACE VVT SENSOR FOR EXHAUST
CAMSHAFT BANK 2 (See page ES-509)
9CHECK CHARCOAL CANISTER ASSEMBLY (CHECK MIL ILLUMINATED)
Result Proceed to
MIL illuminates A
MIL does not illuminate B
REPLACE CHARCOAL CANISTER
ASSEMBLY (See page EC-8)
Page 744 of 3000

ES–4582GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
B
(a) Disconnect the throttle body connector.
(b) Disconnect the accelerator pedal position sensor
connector.
(c) Disconnect the VVT sensor for intake camshaft bank 1
connector.
(d) Disconnect the VVT sensor for exhaust camshaft bank 1
connector.
(e) Disconnect the VVT sensor for intake camshaft bank 2
connector.
(f) Disconnect the VVT sensor for exhaust camshaft bank 2
connector.
(g) Disconnect the canister pump module connector.
(h) Disconnect the E9 and E4 ECM connectors.
(i) Measure the resistance according to the value(s) in the
table below.
Standard resistance (Check for short)
(j) Reconnect the ECM connectors.
(k) Reconnect the canister pump module connector.
(l) Reconnect the VVT sensor for exhaust camshaft bank 2
connector.
(m) Reconnect the VVT sensor for intake camshaft bank 2
connector.
(n) Reconnect the VVT sensor for exhaust camshaft bank 1
connector.
(o) Reconnect the VVT sensor for intake camshaft bank 1
connector.
(p) Reconnect the accelerator pedal position sensor
connector.
(q) Reconnect the throttle body connector.
NG
OK
10CHECK HARNESS AND CONNECTOR
A162963E01
Tester Connections Specified Conditions
VC (E9-23) - Body ground 10 k
or higher
VCPA (E4-26) - Body ground 10 k
or higher
VCP2 (E4-27) - Body ground 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE ECM (See page ES-498)