MPI <4G6> -
Troubleshooting
13A-39
Code No. P0500 Vehicle speed sensor system Probable cause
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).
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>
NG
Replace
the
engine-ECU
<M/T>
or
engine-A/T
-ECU
<A/T>.
OK
Check the trouble symptoms.
OK
Check the following connector:
NG
Repair
NG
Repair
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.
No
Check the vehicle speed sensor
(Refer to GROUP 54 - Combination Meter.)
Yes
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.)
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>
Does the speedometer operate normally?
Code No. P0505 Idle speed control (ISC) system Probable cause
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.
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>
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