Mitsubishi Eclipse. Manual — part 834

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 1. Using scan tool MB991958, check data list item 66:
Overdrive Off Signal (Auto-cruise ECM Signal).

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and prepare to test drive the vehicle.

(Operate the auto-cruise)

(3) Set scan tool MB991958 to data reading mode for item 66:

Overdrive Off Signal (Auto-cruise ECM Signal).

• When driving at level road, the display should be "OFF."

• When driving at uphill road, the display should be "ON."

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction can be

intermittent. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-6

.

NO : Go to Step 2.

STEP 2. Check the auto-cruise system.
Check the auto-cruise system. Refer to GROUP 17,
Auto-cruise Control System Diagnostic Troubleshooting Strat-
egy

P.17-8

.

Q: Is the auto-cruise system operating properly?

YES : Go to Step 3.
NO : Repair it, then check the symptom.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824

AUTOMATIC TRANSAXLE DIAGNOSIS

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STEP 3. Measure the signal voltage at PCM connector C-57
<2.4L Engine> or C-59 <3.0L Engine> by backprobing.
(1) Do not disconnect connector C-57 <2.4L Engine> or C-59

<3.0L Engine>.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 75 and ground by

backprobing.

• The voltage should measure battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?

YES : Go to Step 6.
NO : Go to Step 4.

AC001657

CONNECTOR: C-57 <2.4L ENGINE> OR
C-59 <3.0L ENGINE>

AZ

PCM

C-57 <2.4L ENGINE> OR C-59 <3.0L ENGINE>

AC002097

C-57 <2.4L ENGINE> OR
C-59 <3.0L ENGINE>
HARNESS CONNECTOR:
HARNESS SIDE

AN

AUTOMATIC TRANSAXLE DIAGNOSIS

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STEP 4. Check PCM connector C-57 <2.4L Engine> or C-59
<3.0L Engine> and inter mediate connector C-28 for looser,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 5.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

AC001657

CONNECTOR: C-57 <2.4L ENGINE> OR
C-59 <3.0L ENGINE>

AZ

PCM

C-57 <2.4L ENGINE> OR C-59 <3.0L ENGINE>

AC106611AB

CONNECTOR: C-28

C-28

AUTOMATIC TRANSAXLE DIAGNOSIS

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STEP 5. Check the harness for open circuit, short circuit to
ground or damage between PCM connector C-57 <2.4L
Engine> or C-59 <3.0L Engine> terminal 75 and auto-cruise
control-ECU connector C-20 terminal 3.
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO : Repair or replace the harness wire.

STEP 6. Measure the signal voltage at auto-cruise
control-ECU connector C-20 by backprobing.
(1) Do not disconnect connector C-20.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 3 and ground by

backprobing.

• The voltage should measure battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?

YES : Go to Step 7.
NO : Go to Step 8.

AC001657

CONNECTOR: C-57 <2.4L ENGINE> OR
C-59 <3.0L ENGINE>

AZ

PCM

C-57 <2.4L ENGINE> OR C-59 <3.0L ENGINE>

AC001741

CONNECTOR: C-20

AU

C-20

AC001741

CONNECTOR: C-20

AU

C-20

AC002119

C-20 HARNESS
CONNECTOR:
HARNESS SIDE

AM