Mitsubishi Eclipse. Manual — part 687
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-29
STEP 8. Check the output circuit voltage at auto-cruise
control-ECU connector C-20 (terminal numbers 7,8 and 16)
by backprobing.
(1) Do not disconnect auto-cruise control-ECU connector C-20.
(2) Turn the ignition switch to the "ON" position and the
auto-cruise control main switch to the "ON" position.
(3) Measure the voltage between terminal 7 and ground by
backprobing.
• Voltage should be battery positive voltage. [When decel-
erating with the "SET" switch while driving at constant
speed (Release valve open).]
(4) Measure the voltage between terminal 8 and ground by
backprobing.
• Voltage should be battery positive voltage. [When decel-
erating with the "SET" switch while driving at constant
speed. (Control valve open).]
(5) Measure the voltage between terminal 16 and ground by
backprobing.
• Voltage should be battery positive voltage. (When the
motor is stopped during a constant road speed.)
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are all of the above values satisfied?
YES : Check that diagnostic trouble code 14 is not output. If
diagnostic trouble code 14 is output, replace the
auto-cruise control-ECU (Refer to
.). Then
check that diagnostic trouble code 14 is not.
NO : Go to Step 9.
STEP 9. Check auto-cruise control-ECU connector C-20
and intermediate connector C-94.
Q: Is the connector damaged?
YES : Repair or replace connector. Refer to GROUP 00E,
Harness Connector Inspection
. Then check
that diagnostic trouble code 14 is not output.
NO : Go to Step 10.
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
AC103112
C-20 CONNECTOR
HARNESS SIDE VIEW
AB
AC001451
CONNECTOR: C-20
AB
AC101197AB
CONNECTOR: C-94
CONNECTOR
BLOCK (RH)
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-30
STEP 10. Check auto-cruise control vacuum pump
connector A-01.
Q: Is the connector damaged?
YES : Repair or replace connector. Refer to GROUP 00E,
Harness Connector Inspection
. Then check
that diagnostic trouble code 14 is not output.
NO : Go to Step 11.
STEP 11. Check the auto-cruise vacuum pump.
(1) Disconnect the vacuum hose from the auto-cruise vacuum
pump and connect a vacuum gauge to the vacuum pump.
(2) Disconnect the vacuum pump connector.
(3) Check the auto-cruise vacuum pump and valves according
to the following procedure:
• Connect the positive battery terminal to auto-cruise vac-
uum pump connector terminal 1, and the negative bat-
tery terminal to terminals 2, 3, and 4. The vacuum
gauge should read 27 kPa (8.0 in Hg) or more.
• The vacuum should be maintained when terminal 4 is
disconnected from the negative battery terminal while
terminals 1, 2, and 3 remain connected. Then the vac-
uum gauge should read 0 kPa (0 in Hg) when terminal 2
is disconnected from the negative battery terminal while
terminals 1, and 3 remain connected.
• The vacuum should be maintained when terminal 4 is
disconnected from the negative battery terminal while
terminals 1, 2, and 3 remain connected. Then the vac-
uum gauge should read 0 kPa (0 in Hg) when terminal 3
is disconnected from the negative battery terminal while
terminals 1, and 2 remain connected.
Q: Are all of the above values satisfied?
YES : Go to Step 12.
NO : Replace the auto-cruise vacuum pump (Refer to
.). Then check that diagnostic trouble code 14
is not output.
AC001449
CONNECTOR: A-01
RESERVE
TANK
AB
ACX01181AB
VACUUM
GAUGE
CONTROL
VALVE
RELEASE
VALVE
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-31
STEP 12. Check the harness wire between auto-cruise
control vacuum pump connector A-01 (terminal numbers
2,3 and 4) and auto-cruise control-ECU connector C-20
(terminal numbers 7,8 and 16).
Q: Is any harness wire between auto-cruise control
vacuum pump connector A-01 (terminal numbers 2,3
and 4) and auto-cruise control-ECU connector C-20
(terminal numbers 7,8 and 16) damaged?
YES : Repair harness wire and then check that diagnostic
trouble code 14 is not output.
NO : Check that diagnostic trouble code 14 is not output. If
diagnostic trouble code 14 is output, replace the
auto-cruise control-ECU (Refer to
.). Then
check that diagnostic trouble code 14 is not output.
STEP 13. Check the output circuit voltage at auto-cruise
control-ECU connector C-20 (terminal number 5) by
backprobing.
(1) Do not disconnect auto-cruise control-ECU connector C-20.
(2) Turn the ignition switch to the "ON" position and the
auto-cruise control main switch to the "ON" position.
(3) Measure the voltage between terminal 5 and ground by
backprobing.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage approximately battery positive voltage?
YES : Go to Step 14.
NO : Go to Step 15.
AC001449
CONNECTOR: A-01
RESERVE
TANK
AB
AC001451
CONNECTOR: C-20
AB
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
AC103113
C-20 CONNECTOR
HARNESS SIDE VIEW
AB
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-32
STEP 14. Check intermediate connector C-89.
Q: Is the connector damaged?
YES : Repair or replace connector. Refer to GROUP 00E,
Harness Connector Inspection
. Then check
that diagnostic trouble code 14 is not output.
NO : Check the harness wire between auto-cruise
control-ECU connector C-20 and stoplight switch
connector C-03 for open circuit or damage. Then
repair if necessary. Then check that diagnostic trouble
code 14 is not output.
STEP 15. Check auto-cruise control-ECU connector C-20.
Q: Is the connector damaged?
YES : Repair or replace connector. Refer to GROUP 00E,
Harness Connector Inspection
. Then check
that diagnostic trouble code 14 is not output.
NO : Check that diagnostic trouble code 14 is not output. If
diagnostic trouble code 14 is output, replace the
auto-cruise control-ECU (Refer to
.). Then
check that diagnostic trouble code 14 is not output.
AC103104AD
CONNECTOR: C-89
CONNECTOR
BLOCK (LH)
AC001451
CONNECTOR: C-20
AB
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