DTC P0447 EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL CIRCUIT OPEN
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DTC P0447 EVAPORATIVE EMISSION CONTROL SYSTEM
VENT CONTROL CIRCUIT OPEN
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CHECK OUTPUT SIGNAL FROM ECM.
Turn ignition switch to ON.
Measure the voltage between ECM and chassis ground.
Connector & terminal
(B134) No. 13 (+) — Chassis ground
(−):
Is the voltage
more than 10 V?
CHECK FOR POOR CONTACT.
Check for poor contact in ECM connector.
Is
there poor contact in ECM connector?
Repair poor contact in ECM connector.
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The malfunction indicator
light may light up, however, the circuit is returned to the normal
status at the moment. (However, the possibility of poor contact
still remains.)
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Note
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In this case, repair the following:
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Poor contact
in drain valve connector
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Poor contact in ECM connector
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Poor contact in coupling connector
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CHECK HARNESS BETWEEN DRAIN VALVE AND ECM CONNECTOR.
Turn ignition switch to OFF.
Disconnect the connectors from drain valve and ECM.
Measure the resistance of harness between drain valve
connector and chassis ground.
Connector & terminal
(R69) No. 2 — Chassis ground:
Is the resistance more than 1 MΩ?
Repair short circuit to ground
in harness between ECM and drain valve connector.
CHECK HARNESS BETWEEN DRAIN VALVE AND ECM CONNECTOR.
Measure the resistance of harness between ECM and drain valve
connector.
Connector & terminal
(B134) No. 13 — (R69) No. 2:
Is the resistance less than 1 Ω?
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Repair harness and connector.
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Note
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In this case, repair the following:
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Open circuit
in harness between ECM and drain valve connector
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Poor contact in coupling connector
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CHECK DRAIN VALVE.
Measure the resistance between drain valve terminals.
Terminals
No. 1 — No. 2:
Is
the resistance 10 — 100 Ω?
Replace the drain valve.
CHECK POWER SUPPLY TO DRAIN VALVE.
Turn ignition switch to ON.
Measure the voltage between drain valve and chassis
ground.
Connector & terminal
(R69) No. 1 (+) — Chassis ground (−):
Is the voltage more than 10 V?
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Repair harness and connector.
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Note
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In this case, repair the following:
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Open circuit
in harness between main relay and drain valve
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Poor contact in coupling connector
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Poor contact in main relay connector
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CHECK FOR POOR CONTACT.
Check for poor contact in drain valve connector.
Is
there poor contact in drain valve connector?
Repair poor contact in drain valve connector.
Contact Service Center.