Mitsubishi Galant 9G. Manual — part 460

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-58

STEP 4. Using scan tool MB991958, check data list item 07:
Transmission Range Switch.

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.

(Refer to

P.17-11

).

(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to data reading mode for

auto-cruise control system. (Refer to

P.17-11

).

• Item 07, Transmission Range Switch.

• When selector lever is at the "P" or "N" position, the

display on scan tool MB991958 should be "ON".

• When selector lever is at the "R" or "D" position, the

display on scan tool MB991958 should be "OFF".

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is the switch operating properly?

YES : Go to Step 5.
NO : Refer to

P.17-55

, Symptom Procedures

− Inspection

Procedure 2. Then go to Step 6.

STEP 5. Check the symptoms.
Q: Can auto-cruise control be set?

YES : It can be assumed that this malfunction is intermittent.

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

− How to

Cope with Intermittent Malfunction

P.00-14

).

NO : Replace the PCM. [Refer to GROUP 13A, Power

Control Module (PCM)

P.13A-1140

] <2.4L engine> or

[Refer to GROUP 13B, Power Control Module (PCM)

P.13B-1192

] <3.8L engine>. Then go to Step 6.

STEP 6. Check the symptoms.
Q: Can auto-cruise control be set?

YES : The procedure is complete.
NO : Return to Step 1.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-59

INSPECTION PROCEDURE 5: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set
Vehicle Speed.

.

COMMENT

The output shaft speed sensor signal or the throttle
body is suspected.

.

TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of the output shaft speed sensor.

• Malfunction of the throttle body.

• Malfunction of the PCM.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code.

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.

(Refer to

P.17-11

).

(2) Turn the ignition switch to the "ON" position.
(3) Check for A/T system diagnostic trouble code. (Refer to

GROUP 23A, A/T Diagnosis

− Diagnostic Function − How

to Read and Erase Diagnostic Trouble Code

P.23A-15

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is any DTC set?

YES : Diagnose the A/T system. (Refer to GROUP 23A, A/T

Diagnosis

− Diagnostic Trouble Code Chart

P.23A-42

). Then go to Step 4.

NO : Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-60

STEP 2. Using scan tool MB991958, read the diagnostic
trouble code.

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.

(Refer to

P.17-11

).

(2) Turn the ignition switch to the "ON" position.
(3) Check for MFI system diagnostic trouble code (Refer to

GROUP 13A, MFI Diagnosis

− Diagnostic Function − How

to Read and Erase Diagnostic Trouble Code

P.13A-6

)

<2.4L engine> or (Refer to GROUP 13B, MFI Diagnosis

−

Diagnostic Function

− How to Read and Erase Diagnostic

Trouble Code

P.13B-6

) <3.8L engine>.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is any DTC set?

YES : Diagnose the MFI system. (Refer to GROUP 13A,

MFI Diagnosis

− Diagnostic Trouble Code Chart

P.13A-33

) <2.4L engine> or (Refer to GROUP 13B,

MFI Diagnosis

− Diagnostic Trouble Code Chart

P.13B-34

) <3.8L engine>. Then go to Step 4.

NO : Go to Step 3.

STEP 3. Retest the system
Q: Does hunting occur?

YES : Replace the PCM [Refer to GROUP 13A, Power

Control Module (PCM)

P.13A-1140

] <2.4L engine> or

[Refer to GROUP 13B, Power Control Module (PCM)

P.13B-1192

] <3.8L engine>. Then go to Step 4.

NO : It can be assumed that this malfunction is intermittent.

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

− How to

Cope with Intermittent Malfunction

P.00-14

).

STEP 4. Retest the system
Q: Does hunting occur?

YES : Return to Step 1.
NO : The procedure is complete.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-61

INSPECTION PROCEDURE 6: When "CRUISE" (MAIN) Switch is Turned "ON", "CRUISE" Indicator

Light Inside Combination Meter does not Illuminate. (However, Auto-cruise Control System is

Normal).

AC305714

IGNITION SWITCH (IG1)

JUNCTION
BLOCK

BLACK-

WHITE

COMBINATION
METER

RHEOSTAT
CIRCUIT

BLACK-

WHITE

RHEOSTAT

BLACK-

WHITE

BLACK

BLACK

BLACK

RED

BLACK-

YELLOW

BLACK

POWERTRAIN
CONTROL
MODULE (PCM)

BLACK

RED-

YELLOW

RED

RED

BATTERY

RELAY
BOX

WHITE

WHITE

RED-

WHITE

JOINT
CONNECTOR (1)

RED-

WHITE

RED-

WHITE

BLACK

RED

NOTE

WITHOUT ELECTRONIC BRAKE-FORCE
DISTRIBUTION (EBD) AND ANTI-LOCK
BRAKING SYSTEM (ABS)
WITH ELECTRONIC BRAKE-FORCE
DISTRIBUTION (EBD) AND ANTI-LOCK
BRAKING SYSTEM (ABS)

·

·

*

*

JOINT
CONNECTOR (2)

JOINT
CONNECTOR (3)

ABS-ECU OR
ABS/TCL-ECU

Auto-cruise Control Indicator Light Drive Circuit

AB