Mitsubishi Galant 9G. Manual — part 1139

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-856

DTC SET CONDITIONS
Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is higher than 30°C

(86

°F).

• Drive for 4 seconds or more with the vehicle

speed is 50 km/h (31 mph) or more. Stop the
vehicle [vehicle speed is 1.5 km/h (1.0 mph) or
less]. Repeat 10 times or more.

Judgment Criteria

• Power steering pressure switch continues to be

"ON".

.

OBD-II DRIVE CYCLE PATTERN

None.

.

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

• Power steering pressure switch failed.

• Open or shorted power steering pressure switch

circuit, harness damage, or connector damage.

• PCM failed.

YES

NO

NO

NO

MONITORING

CONDITIONS

END

MALFUNCTION

GOOD

START

POWER STEERING

SWITCH = "ON"

YES

GO/STOP OPERATION

FOR SPECIFIED TIMES

YES

AK302409

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-857

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 switch operating properly?

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 Malfunctions

P.00-14

.

NO : Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-858

STEP 2. Measure the power supply voltage at power
steering pressure switch connector B-31 by backprobing.
(1) Do not disconnect the connector B-31.
(2) Start the engine and run at idle.

(3) Measure the voltage between terminal No. 1 and ground by

backprobing.

• When steering wheel is not turned, voltage should be

battery positive voltage.

• When steering wheel is turned, voltage should be 1 volt

or less.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?

YES : Go to Step 3.
NO : Go to Step 5.

STEP 3. Check harness connector B-31 at power steering
pressure switch for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 14.

AK303162

1

AB

POWER STEERING
PRESSURE SWITCH

B-31 (B)

CONNECTOR: B-31

HARNESS
CONNECTOR:
COMPONENT SIDE

1

AK303163

B-31 HARNESS
CONNECTOR:
HARNESS SIDE

AB

AK303162

1

AB

POWER STEERING
PRESSURE SWITCH

B-31 (B)

CONNECTOR: B-31

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-859

STEP 4. 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 : 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 Malfunctions

P.00-14

.

NO : Replace the PCM. Then go to Step 14.

STEP 5. Check harness connector B-31 at power steering
pressure switch 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 14.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AK303162

1

AB

POWER STEERING
PRESSURE SWITCH

B-31 (B)

CONNECTOR: B-31

HARNESS
CONNECTOR:
COMPONENT SIDE