Exhaust Butterfly Valve Actuator Sensor (Service Code 34) (DTC P048B, P048E)
If the reading is out of the standard, remove the ECU
and check the wiring for continuity between main harness
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Exhaust Butterfly Valve Actuator Sensor Connector [B]
BL lead (ECU terminal 44) [C]
G lead (ECU terminal 38) [D]
If the wiring is good, check the ECU for its ground and
power supply (see ECU Power Supply Inspection in the
Fuel System (DFI) chapter).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation in the Fuel System (DFI)
Exhaust Butterfly Valve Actuator Sensor Output
Before this inspection, confirm the pulley is original po-
sition (see Exhaust Butterfly Valve Cable Installation in
the Engine Top End chapter).
3 Pins Connector [A]
2 Pins Connector [B]
Connect the setting adapter [A] between the 3 pins con-
Special Tool - Throttle Sensor Setting Adapter #1: 57001
Connect a digital meter to the setting adapter leads.
Exhaust Butterfly Valve Actuator Sensor Output Voltage
Connections to Adapter:
Digital Meter (+) → BL (actuator Y) lead
Digital Meter (−) → BK/BL (actuator BK) lead
Measure the output voltage at the 3 pins connector of the
exhaust butterfly valve actuator when the pulley is original
Turn the ignition switch on.
Standard: DC 3.46 ∼ 3.76 V at pulley original position
Turn the ignition switch off.
If the reading is out of the standard, check the exhaust
butterfly valve actuator sensor resistance (see Exhaust
Butterfly Valve Actuator Sensor Resistance Inspection).
SELF-DIAGNOSIS SYSTEM 17-69