Deceleration Control System (MPV 3.0L & 929)

Deceleration control system is a function of ECU. It provides fuel cut during deceleration.

1. Using voltmeter, backprobe ECU connector terminals No. 3C, 3E or 3F. Start engine. Voltage should pulsate.
2. Increase engine speed to 4500 RPM. Suddenly decrease engine speed. Voltage should become constant during deceleration. If not, check idle switch, coolant temperature sensor, dashpot and all ECU connections.