Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 385

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-59

CIRCUIT OPERATION
This circuit transmits the "N" or "P" position signal of
the park/neutral position switch to the auto-cruise
control-ECU.
When the park/neutral position switch is at the "N" or
"P" position, auto-cruise control-ECU terminal
number 13 will receives 0 volt.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably an open-circuit in the output
signal circuit in "N" range.

TROUBLESHOOTING HINTS

•

Malfunction of the park/neutral position switch.

•

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 park/neutral
position switch connector B-41 by backprobing.
(1) Do not disconnect park/neutral position switch connector B-

41.

(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 10 and ground by

backprobing.

•

Voltage should be battery positive voltage.
(When select lever is in a position other than "N"
range.)

•

Voltage should be 0.5 volts or less.
(When select lever is in "N" range.)

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage within specifications?

YES : Check that the malfunction is eliminated.

If the malfunction is eliminated, replace the auto-
cruise control-ECU. (Refer to

P.17-81

.)

Then check that the malfunction is eliminated.

NO : Go to Step 2.

AC003599 AB

CONNECTOR: C-28

1 2 3 4 5 6

7

8

9 10

AC002393

B-41 CONNECTOR
HARNESS SIDE VIEW

AD

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-60

STEP 2. park/neutral position switch connector B-41.
Q: Is the connector damaged?

YES : Repair or replace connector.

Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then check that the malfunction is eliminated.

NO : Go to Step 3.

STEP 3. Check the circuit at the park/neutral position
switch.
(1) Disconnect the park/neutral position switch connector B-41.
(2) Measure the continuity park/neutral position switch

connector terminals.

NOTE: For vehicles with sport mode, four position
(P.R.N.D) are available.

Q: Is the continuity meet the table above?

YES : Go to Step 4.
NO : Replace the park/neutral position switch.

Refer to GROUP 23A, Transmission

P.23B-11

.

Then check that the malfunction is eliminated.

AC001482

CONNECTOR: B-41

DIPSTICK

AB

ITEMS

TERMINAL CONNECTOR OF
TESTER

SPECIFIED
CONDITION

P

3

−

8, 9

−

10

Less than 2
ohm.

N

4

−

8, 9

−

10

AC001846

P

R

N

D

3

2

L

AB

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-61

STEP 4. Check the output circuit voltage at auto-cruise
control-ECU connector C-20 by backprobing.
(1) Do not disconnect auto-cruise control switch connector C-

20.

(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 13 and ground by

backprobing.

•

Voltage should be battery positive voltage.
(When select lever is in a position other than "N"
range.)

•

Voltage should be 0.5 volts or less.
(When select lever is in "N" range.)

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage within specifications?

YES : Check that the malfunction is eliminated.

If the malfunction is eliminated, replace the auto-
cruise control-ECU. (Refer to

P.17-81

.)

Then check that the malfunction is eliminated.

NO : Go to Step 5.

STEP 5. 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

P.00E-2

.

Then check that the malfunction is eliminated.

NO : Go to Step 6.

STEP 6. Check intermediate connector C-28.
Q: Is the connector damaged?

YES : Repair or replace connector.

Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then check that the malfunction is eliminated.

NO : Go to Step 7.

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

ACX01906

C-20 CONNECTOR
HARNESS SIDE VIEW

AF

AC001451

CONNECTOR: C-20

AB

AC003599 AB

CONNECTOR: C-28

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-62

STEP 7. Check the harness wire between park/neutral
position switch connector B-41 and auto-cruise control-
ECU connector C-20.
Q: Is any harness wire between park/neutral position

switch connector B-41 and auto-cruise control-ECU
connector C-20 damaged?
YES : Repair the harness wire and then check that the

malfunction is eliminated.

NO : Check that the malfunction is eliminated.

If the malfunction is eliminated, replace the auto-
cruise control-ECU. (Refer to

P.17-81

.)

Then check that the malfunction is eliminated.

INSPECTION PROCEDURE 5: When the Auto-cruise Control "CANCEL" Switch is Set to ON, Auto-
cruise Control is not Cancelled.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably an open-circuit in the output in
the circuit inside the "CANCEL" switch.

TROUBLESHOOTING HINTS

•

Malfunction of the auto-cruise control switch.

DIAGNOSIS
Replace the auto-cruise control switch. (Refer to

P.17-81

.)

Then check the malfunction is eliminated.

INSPECTION PROCEDURE 6: Auto-cruise control cannot be set.

TECHNICAL DESCRIPTION (COMMENT)
The fail-safe function is probably cancelling auto-
cruise control.
In this case, scan tool MB991502 can be used to
check the trouble symptoms in each system by
checking the diagnostic trouble codes.
The scan tool can also be used to check if the
circuits of each input switch are normal or not by
checking the input switch codes.

TROUBLESHOOTING HINTS

•

Malfunction of the auto-cruise control switch.

•

Malfunction of the auto-cruise control-ECU.

•

Malfunction of the clutch pedal position switch
<M/T>.

•

Malfunction of the park/neutral position switch
<A/T>.

AC001482

CONNECTOR: B-41

DIPSTICK

AB

AC001451

CONNECTOR: C-20

AB