3-54 FUEL SYSTEM (DFI)
Vehicle-down Sensor (Service Code 31)
Hold the vehicle-down sensor vertically.
Refer to the Self-diagnosis Procedures, connect the 12 V
battery to the main harness.
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
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 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 the main harness
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Vehicle-down Sensor Connector [B]
BR lead [C] (ECU terminal 2)
GY lead [D] (ECU terminal 24)
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 Circuit
2. Vehicle-down Sensor