Mitsubishi Eclipse. Manual - part 291

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-657

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 mph) or 
less]. Repeat 10 times or more.

Judgment Criteria

• Power steering pressure switch continues to be 

"ON".

.

OBD-ll 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, or harness damage, or connector dam-
age.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

YES

NO

NO

NO

MONITORING

CONDITIONS

END

MALFUNCTION

GOOD

START

POWER STEERING

SWITCH = "ON"

YES

GO/STOP OPERATION

FOR SPECIFIED TIMES

YES

AK301453

F1: COUNTER OF A DRIVING STATE.
F2: COUNTER OF A STOP STATE.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-658

• MB991827: USB Cable

• MB991911: Main Harness B

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 stopped while idling, "OFF" will 

be displayed.

• If the steering wheel is steered 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. Measure the power supply voltage at power 
steering pressure switch connector B-19 by backprobing.
(1) Do not disconnect the connector B-19.
(2) Start the engine and run at idle.

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

backprobing.

• When steering wheel is stationary, 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 voltage normal?

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

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300105

1

B-19

AB

CONNECTOR: B-19

HARNESS
CONNECTOR:
COMPONENT SIDE

AK000259AG

1

B-19 HARNESS 
CONNECTOR: 
HARNESS SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-659

STEP 3. Check connector B-19 at power steering pressure 
switch for damage.
Q: Is the 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.

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 stopped while idling, "OFF" will 

be displayed.

• If the steering wheel is steered 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 :  Replace the ECM or PCM. Then go to Step 14.

STEP 5. Check connector B-19 at power steering pressure 
switch for damage.
Q: Is the 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.

AK300105

1

B-19

AB

CONNECTOR: B-19

HARNESS
CONNECTOR:
COMPONENT SIDE

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300105

1

B-19

AB

CONNECTOR: B-19

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-660

STEP 6. Measure the power supply voltage at power 
steering pressure switch harness side connector B-19.
(1) Disconnect the connector B-19 and measure at the harness 

side.

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

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

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 11.
NO :  Go to Step 7.

AK300105

1

B-19

AB

CONNECTOR: B-19

HARNESS
CONNECTOR:
COMPONENT SIDE

AK000260AJ

1

B-19 HARNESS 
CONNECTOR: 
COMPONENT SIDE