Mitsubishi FUEL Manual page 39

Code No. P0500 Vehicle speed sensor system
Range of Check
D Engine: Two seconds after the engine was started
D Idle switch: OFF
D Engine speed: 2,500 r/min or more
D During high engine load
Set Conditions
D The sensor output voltage does not change for 2 seconds (no pulse signal
input).
Does the speedometer operate normally?
Use an analyzer to measure the output waveform of the
vehicle speed sensor at engine-ECU connector C-40 <M/T> or
engine-A/T-ECU connector C-175 <A/T>.
D Driving the vehicle
D The voltage between terminal 86 <M/T>, 80 <A/T> and
earth
OK: A normal waveform should be displayed as described
in OSCILLOSCOPE INSPECTION PROCEDURE,
and noise should not be displayed in the waveform.
(Refer to GROUP 23 - Troubleshooting.)
Check the following connector: C-40 <M/T>, C-175 <A/T>
Check the trouble symptoms.
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
Code No. P0505 Idle speed control (ISC) system
Check Area
D Vehicle speed has reached 1.5 km/h at least once.
D Under the closed loop idle speed control.
Judgment Criteria
D Actual idle speed has continued to be higher than the target idle speed by
300 r/min or more for 10 sec.
Check Area
D Vehicle speed has reached 1.5 km/h at least once.
D During idle speed closed loop control.
D The highest temperature at the last drive is 45_C or less.
D Engine coolant temperature is approx. 80_C or more.
D Battery voltage is 10 V or more.
D Barometric pressure is 76 kPa or higher.
D Intake air temperature is - 10_C or more.
Judgment Criteria
D Actual idle speed has been minimum 200 r/min higher than the target idle
speed for ten seconds.
Check Area
D During idle speed closed loop control.
D Engine coolant temperature is about 80_C or higher.
D Battery voltage is 10 V or higher.
D Power steering switch is off.
D Volumetric efficiency is 40 % or lower.
D Barometric pressure is 76 kPa or higher.
D Intake air temperature is - 10_C or more.
Judgment Criteria
D Actual idle speed has been minimum 100 r/min higher than the target idle
speed for ten seconds.
MPI <4G6> -
Yes
OK
OK
NG
Troubleshooting
Probable cause
D Malfunction of the vehicle speed sensor
D Open or short circuit in the vehicle speed sensor
circuit or loose connector contact
D Malfunction of engine-ECU <M/T>
D Malfunction of engine-A/C-ECU <A/T>
No
Check the vehicle speed sensor
(Refer to GROUP 54 - Combination Meter.)
NG
Check the following connectors:
B-65, B-66, C-40 <M/T>, B-67, C-175 <A/T>, C-47 <LHD>,
C-49 <RHD>
OK
Check the harness wire between vehicle speed sensor
connector and the engine-ECU <M/T> or engine-A/T-ECU
<A/T>, and repair if necessary.
NG
Repair
Probable cause
D Malfunction of idle speed control (ISC) servo
D Improper connector contact, open circuit or
short-circuit harness wire
D Malfunction of engine-ECU <M/T>
D Malfunction of engine-A/C-ECU <A/T>
13A-39
NG
Repair