DTC P1400 FUEL TANK PRESSURE CONTROL SOLENOID VALVE CIRCUIT LOW
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DTC P1400 FUEL TANK PRESSURE CONTROL SOLENOID
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. 12 (+) — 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.
Contact Service Center.
CHECK HARNESS BETWEEN FUEL TANK PRESSURE CONTROL SOLENOID
VALVE AND ECM CONNECTOR.
Turn ignition switch to OFF.
Disconnect the connectors from fuel tank pressure control
solenoid valve and ECM.
Measure the resistance of harness between fuel tank
pressure control solenoid valve connector and chassis ground.
Connector & terminal
(R68) No. 2 — Chassis ground:
Is the resistance less than 10 Ω?
Repair short circuit to ground
in harness between ECM and fuel tank pressure control solenoid valve connector.
CHECK HARNESS BETWEEN FUEL TANK PRESSURE CONTROL SOLENOID
VALVE AND ECM CONNECTOR.
Measure the resistance of harness between ECM and fuel tank
pressure control solenoid valve connector.
Connector & terminal
(B134) No. 12 — (R68) 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 pressure control solenoid valve connector
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Poor contact in coupling connector
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CHECK FUEL TANK PRESSURE CONTROL SOLENOID VALVE.
Measure the resistance between fuel tank pressure control
solenoid valve terminals.
Terminals
No. 1 — No. 2:
Is
the resistance 10 — 100 Ω?
Replace the fuel tank pressure
control solenoid valve.
CHECK POWER SUPPLY TO FUEL TANK PRESSURE CONTROL SOLENOID
VALVE.
Turn ignition switch to ON.
Measure the voltage between fuel tank pressure control
solenoid valve and chassis ground.
Connector & terminal
(R68) 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 pressure control solenoid
valve connector
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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 pressure control solenoid
valve connector.
Is there poor contact in fuel tank
pressure control solenoid valve connector?
Repair poor contact in fuel tank pressure
control solenoid valve connector.
Contact Service Center.