VC Output Circuit

1NZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: VC Output Circuit

VC Output Circuit

DESCRIPTION

The VC voltage (5 V) is generated in the ECM. The voltage is used to supply power to the throttle position sensor, canister pump module, etc.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK MIL
(a) Check that the MIL (Malfunction Indicator Lamp) lights up when turning the power switch ON (IG).
OK:
MIL lights up.
OK -- SYSTEM IS OK
NG -- Continue to next step.
2. CHECK CONNECTION BETWEEN TECHSTREAM AND ECM
(a) Connect Techstream to the DLC3.
(b) Turn the power switch ON (IG) and turn Techstream ON.
(c) Check the connection between Techstream and ECM.
Result:





A -- GO TO MIL CIRCUIT
B -- Continue to next step.
3. CHECK ECM (VC VOLTAGE)





(a) Turn the power switch ON (IG).
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





NEXT -- Continue to next step.
4. CHECK MIL (THROTTLE POSITION SENSOR)
(a) Disconnect the T3 throttle body connector.
(b) Turn the power switch ON (IG).
(c) Check the MIL.
Result:





A -- REPLACE THROTTLE BODY
B -- Continue to next step.
5. CHECK MIL (WATER VALVE)
(a) Disconnect the W5 water valve connector.
(b) Turn the power switch ON (IG).
(c) Check the MIL.
Result:





A -- REPLACE WATER VALVE
B -- Continue to next step.
6. CHECK MIL (CANISTER PUMP MODULE)
(a) Disconnect the V7 canister pump module connector.
(b) Turn the power switch ON (IG).
(c) Check the MIL.
Result:





A -- REPLACE CHARCOAL CANISTER ASSEMBLY
B -- Continue to next step.
7. CHECK MIL (VAPOR PRESSURE SENSOR)
(a) Disconnect the V6 vapor pressure sensor connector.
(b) Turn the power switch ON (IG).
(c) Check the MIL.
Result:





A -- REPLACE VAPOR PRESSURE SENSOR
B -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
(a) Disconnect the T3 throttle body connector.
(b) Disconnect the W5 water valve connector.
(c) Disconnect the V7 canister pump module connector.
(d) Disconnect the V6 vapor pressure sensor connector.





(e) Disconnect the E4 ECM connector.
(f) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM