Vehicle-down Sensor (Service Code 31) (DTC C0064)
(Checking wire for short circuit to power supply wire)
Connect the ECU connectors.
Connect the measuring adapter [A] between the harness
connector and vehicle-down sensor as shown.
Main Harness [B]
Vehicle-down Sensor [C]
Special Tool - Measuring Adapter: 57001-1700
Connect a digital meter [D] to the measuring adapter
Vehicle-down Sensor Output Voltage
Connections to Adapter:
Digital Meter (+) → W (sensor Y/G) lead
Digital Meter (–) → BK (sensor G) lead
Hold the sensor vertically.
Measure the output voltage with the engine stopped and
with the connector joined.
Turn the ignition switch on.
Tilt the sensor 60 ∼ 70° or more [A] right or left, then hold
the sensor almost vertical with the arrow mark pointed up
[B], and measure the output voltage.
With sensor tilted 60 ∼ 70° or more right
or left: DC 0.65 ∼ 1.35 V
With sensor arrow mark pointed up: DC
3.55 ∼ 4.45 V
Turn the ignition switch off.
If the reading is DC 5 V or more, repair or replace the main
If the main harness is no problem, replace the vehicle
(Checking wire for short circuit to ground)
ECU Connectors (see ECU Removal)
Vehicle-down Sensor Connector (see Vehicle-down
Check the wiring for short circuit to ground by checking
continuity between the sensor connector [A] and frame
Wiring Continuity Inspection
Y/G lead (ECU terminal 19) [C] ← → Frame Ground
If there is continuity, repair or replace the main harness.
FUEL SYSTEM (DFI) 3-77