Mitsubishi 3000GT 1991, Service Manual, Page: 666 / 1146

ELECTRONIC CONTROL SUSPENSION (ECS)
Troubleshooting
TROUBLESHOOTING
QUICK REFERENCE CHART FOR TROUBLESHOOTING
Symptoms
indicator light does not switch
TROUBLESHOOTING HINTS
The sensor is a sensor associated with ride control (detecting pitching, bouncing and rough road). If it
fails, therefore, ride control stops.
A self diagnostic decision on the steering angular velocity sensor is made by the ECS control unit which
internally detects the voltages of the two sensor output lines connected to the ECS control unit to detect
an open circuit in the signal line. When the signal line is short-circuited or when the power line is
open-circuited, however, it cannot be detected. In a situation where anti-roll control only stops, if
self-diagnosis code No. 21 is not on display, a short-circuited sensor output line or open-circuited sensor
power line is suspected.
The vehicle speed sensor is a sensor associated with attitude controls (anti-dive, anti-squat) and steering
stability controls (anti-roll, high speed sensitive controls). If all these controls stop, therefore, trouble in the
sensor is suspected. The vehicle speed sensor is also in use for operation of the speedometer and for the
other electronics controlled systems for the engine, automatic transaxle, etc.
The sensor associated with anti-squat control is the throttle position sensor. The sensor is also used for
control of the engine and automatic transaxle. If the sensor fails, therefore, the check engine light in the
combination meter will light, and engine self-diagnosis code No. 14 will be output. In a situation where
anti-squat control only stops, therefore, if the check engine light does not light, defective wiring is
suspected between the ECS control unit and throttle position sensor.
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