Mitsubishi Eclipse. Manual — part 685
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-21
DTC 12: Vehicle Speed Signal System <A/T>
.
AC103147
Vehicle Speed Signal System Circuit
AB
AC001451
CONNECTOR: C-20
AB
AC101201AB
CONNECTOR: C-28
AC001657
CONNECTOR: C-57 <2.4L ENGINE> OR
C-59 <3.0L ENGINE>
AK
PCM
AC101196AC
CONNECTOR: C-77
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-22
CIRCUIT OPERATION
This circuit checks the vehicle speed signal. When
the vehicle moves forward and reverses, the sensor
turns ON and OFF repeatedly.
.
DTC SET CONDITIONS
The vehicle speed signals from the PCM are not
input to the auto-cruise control-ECU when the vehi-
cle speed is 40 km/h (25 mph) or more.
.
TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
• Malfunction of the output shaft speed sensor.
• Damaged harness or connector.
• Malfunction of the PCM.
• Malfunction of the auto-cruise control-ECU.
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
STEP 1. Check the speedometer.
Q: Does the speedometer work normally?
YES : Go to Step 2.
NO : Check the speedometer circuit and repair or replace
as required. (Refer to GROUP 54A, Combination
Meter Assembly and Vehicle Speed Sensor
STEP 2. Check joint connector (1) C-77.
Q: Is the connector damaged?
YES : Repair or replace connector. Refer to GROUP 00E,
Harness Connector Inspection
. Then check
that diagnostic trouble code 12 is not output.
NO : Go to Step 3.
AC101196AC
CONNECTOR: C-77
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-23
STEP 3. Check the harness wire between auto-cruise
control-ECU connector C-20 (terminal number 10) and joint
connector (1) C-77 (terminal number 19).
Q: Is any harness wire between auto-cruise control-ECU
connector C-20 (terminal number 10) and joint
connector (1) C-77 (terminal number 19) damaged?
YES : Repair the harness wire and then check that
diagnostic trouble code 12 is not output.
NO : Check that diagnostic trouble code 12 is not output. If
diagnostic trouble code 12 is output, replace the
auto-cruise control-ECU (Refer to
.). Then
check that diagnostic trouble code 12 is not output.
AC001451
CONNECTOR: C-20
AB
AC101196AC
CONNECTOR: C-77
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-24
DTC 14 : Stoplight Switch System
AC106577AB
Stoplight Switch System Circuit
AC001449
CONNECTOR: A-01
RESERVE
TANK
AB
AC001451
CONNECTOR: C-20
AB
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