Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 373
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-11
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC 11: Auto-cruise Vacuum Pump Drive System
AC005108
Auto-cruise Vacuum Pump Drive System Circuit
AB
AC001449
CONNECTOR: A-01
RESERVE
TANK
AB
AC003552 AB
CONNECTOR: C-06
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-12
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 by backprobing.
(1) Do not disconnect auto-cruise control-ECU connector C-20.
(2) Turn the ignition switch to "ON" position and the auto-cruise
control main switch to "ON" position.
(3) Measure the voltage between terminal 7 and ground by
backprobing.
•
Voltage should be battery positive voltage.
[When decelerating 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 decelerating 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 "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.
AC001451
CONNECTOR: C-20
AB
AC001992
CONNECTOR: C-94
AF
CONNECTOR
BLOCK (RH)
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
ACX01897
C-20 CONNECTOR
HARNESS SIDE VIEW
AF
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-13
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
AC001992
CONNECTOR: C-94
AF
CONNECTOR
BLOCK (RH)
AC001449
CONNECTOR: A-01
RESERVE
TANK
AB
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-14
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
vacuum pump connector terminal 1, and the negative
battery 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 vacuum 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 vacuum 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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