DTC P1446 FUEL TANK SENSOR CONTROL VALVE CIRCUIT LOW
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DTC P1446 FUEL TANK SENSOR CONTROL VALVE
CIRCUIT LOW
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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 fuel tank sensor control 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 FUEL TANK SENSOR CONTROL VALVE AND
ECM CONNECTOR.
Turn ignition switch to OFF.
Disconnect the connectors from fuel tank sensor control
valve and ECM.
Measure the resistance of harness between fuel tank
sensor control valve connector and chassis ground.
Connector & terminal
(R144) No. 2 — Chassis ground:
Is the resistance more than 1 MΩ?
Repair short circuit to ground
in harness between ECM and fuel tank sensor control valve connector.
CHECK HARNESS BETWEEN FUEL TANK SENSOR CONTROL VALVE AND
ECM CONNECTOR.
Measure the resistance of harness between ECM and fuel tank
sensor control valve connector.
Connector & terminal
(B134) No. 24 — (R144) 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 fuel tank sensor control valve connector
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Poor contact in coupling connector
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CHECK FUEL TANK SENSOR CONTROL VALVE.
Measure the resistance between fuel tank sensor control valve
terminals.
Terminals
No. 1 — No. 2:
Is
the resistance 10 — 100 Ω?
Replace the fuel tank sensor control
valve.
CHECK POWER SUPPLY TO FUEL TANK SENSOR CONTROL VALVE.
Turn ignition switch to ON.
Measure the voltage between fuel tank sensor control
valve and chassis ground.
Connector & terminal
(R144) 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 fuel tank sensor control 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 fuel tank sensor control valve connector.
Is there poor contact in fuel tank sensor control valve
connector?
Repair poor contact in fuel tank sensor
control valve connector.
Contact Service Center.