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FUEL SYSTEM (DFI) 3-75
Vehicle-down Sensor (Service Code 31)
If the reading is out of the standard, remove the ECU
and check the wiring for continuity between main harness
connectors.
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Vehicle-down Sensor Connector [B]
BL lead (ECU terminal 4) [C]
G lead (ECU terminal 49) [D]
If the wiring is good, check the ECU for its ground and
power supply (see ECU Power Supply Inspection).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation).
Vehicle-down Sensor Output Voltage Inspection
•
Remove the vehicle-down sensor (see Vehicle-down
Sensor Removal).
•
Connect the measuring adapter [A] to the vehicle-down
sensor connectors as shown.
Special Tool - Measuring Adapter: 57001-1700
Main Harness [B]
Vehicle-down Sensor [C]
•
Connect a digital meter [D] to the measuring adapter
leads.
Vehicle-down Sensor Output Voltage
Connections to Adapter:
Digital Meter (+) → W (sensor Y/G) lead
Digital Meter (–) → BK (sensor G) lead
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