3-72 FUEL SYSTEM (DFI)
Vehicle-down Sensor (Service Code 31)
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
If you need to test again, turn the ignition switch OFF,
and then ON.
Turn the ignition switch OFF.
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 con-
Disconnect the ECU and sensor connectors.
ECU Connector [A] ←→
Vehicle-down Sensor Connector [B]
Y/G lead (ECU terminal 19) [C]
BR/BK lead (ECU terminal 33) [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).