3-58 FUEL SYSTEM (DFI)
Vehicle-down Sensor (Service Code 31)
Vehicle-down Sensor Output Voltage Inspection
Remove the vehicle-down sensor.
Remove the vehicle-down sensor, and connect the mea-
suring adapter [A].
Special Tool - Measuring Adapter: 57001-1700
Main Harness [B]
Vehicle-down Sensor [C]
Connect a digital meter [D] to the harness adapter leads.
Vehicle-down Sensor Output Voltage
Connections to Adapter:
Digital Meter (+) → W (sensor Y/G) lead
Digital Meter (–) → BK (sensor GY) lead
Hold the sensor vertically.
Connect the power supply harness (option P/No. 26011
-0246) and 12 V battery to the capacitor lead connector
(see Vehicle-down Sensor Input Voltage Inspection).
Measure the output voltage with the engine stopped, and
with the connector joined.
Tilt the sensor 55 ∼ 75° or more [A] right or left, then hold
the sensor almost vertical with the arrow mark [B] pointed
up [C], and measure the output voltage.
With sensor tilted 55 ∼ 75° or more right
or left: DC 3.7 ∼ 4.4 V
With sensor arrow mark pointed up: DC
0.4 ∼ 1.4 V
If you need to test again, disconnect the battery con-
If the reading is out of the standard, replace the sensor.
If the reading is within the standard, remove the ECU and
check the wiring for continuity between main harness side
Disconnect the ECU and sensor connectors.
ECU Connector [A] ←→
Vehicle-down Sensor Connector [B]
Y/G lead (ECU terminal 2) [C]
GY lead (ECU terminal 24) [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).