Mitsubishi Eclipse. Manual — part 683
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-13
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC 11: Auto-cruise Vacuum Pump Drive System
AC106578AB
Auto-cruise Vacuum Pump Drive System Circuit
AC001449
CONNECTOR: A-01
RESERVE
TANK
AB
AC001451
CONNECTOR: C-20
AB
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-14
.
CIRCUIT OPERATION
This circuit activates the vacuum pump used to
accelerate/decelerate, set, and cancel the vehicle
speed. The auto-cruise control-ECU controls the
control valve, release valve, and motor by turning the
transistor in the ECU on and off.
.
DTC SET CONDITIONS
Any drive signal for the release valve, control valve
or motor is not input to the auto-cruise control-ECU.
.
TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
• Malfunction of the auto-cruise vacuum pump.
• Damaged harness or connector.
• Malfunction of the auto-cruise control-ECU.
.
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
STEP 1. 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 11 is not output. If
diagnostic trouble code 11 is output, replace the
auto-cruise control-ECU (Refer to
.). Then
check that diagnostic trouble code 11 is not.
NO : Go to Step 2.
AC101196AB
CONNECTOR: C-06
AC101197AB
CONNECTOR: C-94
CONNECTOR
BLOCK (RH)
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
AC103112
C-20 CONNECTOR
HARNESS SIDE VIEW
AB
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-15
STEP 2. 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 11 is not output.
NO : Go to Step 3.
STEP 3. 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 11 is not output.
NO : Go to Step 4.
AC001451
CONNECTOR: C-20
AB
AC101197AB
CONNECTOR: C-94
CONNECTOR
BLOCK (RH)
AC001449
CONNECTOR: A-01
RESERVE
TANK
AB
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-16
STEP 4. 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 5.
NO : Replace the auto-cruise vacuum pump (Refer to
.). Then check that diagnostic trouble code 11
is not output.
ACX01181AB
VACUUM
GAUGE
CONTROL
VALVE
RELEASE
VALVE
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