Vehicle-down Sensor (Service Code 31)
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 16)
GY lead [D] (ECU terminal 17)
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
1. Vehicle-down Sensor
FUEL SYSTEM (DFI) 3-55