Mitsubishi Galant (2004+). Manual - part 190

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-51

STEP 21. Using scan tool MB991958, read the diagnostic 
trouble codes.

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 

P.17-12

.

(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to read the diagnostic trouble 

codes.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC 22 set?

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

Control Module (PCM) 

P.13A-1121

]. Then go to Step 

22 .

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.00-6

).

STEP 22. Using scan tool MB991958, read the diagnostic 
trouble codes.

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 

P.17-12

.

(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to read the diagnostic trouble 

codes.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC 22 set?

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

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-52

DTC 23: Powertrain Control module (PCM) and Its Related Components

.

DTC SET CONDITIONS
This DTC is set when there is an failure in the PCM 
and its related components.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Malfunction of the MFI system.

• Malfunction of the A/T system.

• Malfunction of the PCM.

DIAGNOSIS

Required Special Tool:

• 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 MFI system 
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.17-12

).

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

GROUP 13A, MFI Diagnosis - How to Read and Erase 
Diagnostic Trouble Code 

P.13A-5

) <2.4L engine>. (Refer to 

GROUP 13B, MFI Diagnosis - How to Read and Erase 
Diagnostic Trouble Code 

P.13B-5

) <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 control system. (Refer to GROUP 

13A, MFI Diagnosis 

− Diagnostic Trouble Code Chart 

P.13A-34

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

Diagnosis 

− Diagnostic Trouble Code Chart 

P.13B-33

) <3.8L engine>.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

17-53

STEP 2. Using scan tool MB991958, read the A/T system 
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.17-12

).

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

GROUP 23A, Diagnosis 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-43

). Then go to Step 4 .

NO :  Go to Step 3 .

STEP 3. Using scan tool MB991958, read the auto-cruise 
control system 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.17-12

).

(2) Turn the ignition switch to the "ON" position.
(3) Use scan tool MB991958 to read the auto-cruise control 

system diagnostic trouble codes.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC 23 set?

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

Control Module (PCM) 

P.13A-1121

]. 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.00-6

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-54

STEP 4. Using scan tool MB991958, read the auto-cruise 
control system 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.17-12

).

(2) Turn the ignition switch to the "ON" position.
(3) Use scan tool MB991958 to read the auto-cruise control 

system diagnostic trouble codes.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC 23 set?

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

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827