Mitsubishi Galant (2004+). Manual - part 1280

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-813

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, check data list item 27: 
Power Steering Pressure 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.
(2) Start the engine and run at idle.

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

27, Power Steering Pressure Switch.

• If the steering wheel is not turned while idling, "OFF" will 

be displayed.

• If the steering wheel is turned while idling, "ON" will be 

displayed.

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

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

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

P.00-6

.

NO :  Go to Step 2.

STEP 2. Check the power steering fluid level.
Refer to GROUP 37A, On-Vehicle Service 

− Fluid Level Check 

P.37A-21

.

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 7.
NO :  Go to Step 3.

STEP 3. Check the power steering pressure switch.

Refer to GROUP 37A, On-Vehicle Service 

− Power Steering 

Pressure Switch Check

P.37A-24

.

Q: Are there any abnormalities?

YES : Replace the power steering pressure switch. Then go 

to Step 7.

NO :  Go to Step 4.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-814

STEP 4. Check the oil pump pressure .

Refer to GROUP 37A, On-Vehicle Service 

− Oil Pump Pressure 

Test 

P.37A-4

.

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 7.
NO :  Go to Step 5.

STEP 5. Check harness connector B-31 at the power 
steering pressure switch and harness connector B-21 at 
PCM for damage.

Q: Is the harness connector in good condition?

YES : Go to Step 6.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 7.

AK303162

1

AB

POWER STEERING
PRESSURE SWITCH

B-31 (B)

CONNECTOR: B-31

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-815

STEP 6. Check for harness damage between power 
steering pressure switch connector B-31 (terminal No. 1) 
and PCM connector B-21 (terminal No. 78).

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 7.
NO :  Repair it. Then go to Step 7.

AK303162

1

AB

POWER STEERING
PRESSURE SWITCH

B-31 (B)

CONNECTOR: B-31

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-816

STEP 7. Using scan tool MB991958, check data list item 27: 
Power Steering Pressure 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.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item 

27, Power Steering Pressure Switch.

• If the steering wheel is not turned while idling, "OFF" will 

be displayed.

• If the steering wheel is turned while idling, "ON" will be 

displayed.

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

YES : The inspection is complete.
NO :  Retry the troubleshooting.

DTC P0606: Powertrain Control Module Main Processor Malfunction

.

TECHNICAL DESCRIPTION

• Throttle actuator control module processor 

checks the PCM for abnormal conditions.

.

DESCRIPTIONS OF MONITOR METHODS
No watch dog pulse is detected.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DTC SET CONDITIONS

Check Conditions

• Ignition switch is "ON" position.

Judgement Criteria

• No surveillance pulse signals should be input for 

0.5 second.

.

OBD-II DRIVE CYCLE PATTERN
None.

.

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

• PCM failed.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827