Mitsubishi Outlander GS45X. Manual - part 677

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-531

STEP 2. Measure the power supply voltage at power 
steering pressure switch connector B-122 by backprobing. 
(1) Do not disconnect the connector B-122. 
(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-122 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 13. 

STEP 4. Using scan tool MB991958, check data list item 83: 
Power Steering Pressure Switch. 
(1) Start the engine and run at idle. 
(2) Set scan tool MB991958 to the data reading mode for item 

83, 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. 

(3) 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.00-15

.

NO :  Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code Registration Judgment Table <Vehicles 

with KOS> 

P.42B-15

 or GROUP 42C, Diagnosis 

− ID 

Codes Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

. Then go to Step 13. 

STEP 5. Check harness connector B-122 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 13.

1

AK202987

B-122 harness 
connector: 
harness side

AF

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-532

STEP 6. Measure the power supply voltage at power 
steering pressure switch harness side connector B-122. 
(1) Disconnect the connector B-122 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 10. 
NO :  Go to Step 7. 

STEP 7. Check harness connector B-10 at ECM for 
damage. 
Q: Is the harness connector in good condition? 

YES : Go to Step 8. 
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 13.

1

AK202987

B-122 harness 
connector: 
harness side

AF

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-533

STEP 8. Measure the power supply voltage at ECM 
connector B-10 by using power plant ECU check harness 
special tool MB992110. 
(1) Disconnect all ECM connectors. Connect the power plant 

ECU check harness special tool MB992110 between the 
separated connectors. 

(2) Disconnect the power steering pressure switch connector 

B-122. 

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

(4) Measure the voltage between terminal No. 58 and ground. 

• Voltage should be between battery positive voltage. 

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

present?
YES : Repair harness wire between power steering 

pressure switch connector B-122 (terminal No. 1) and 
ECM connector B-10 (terminal No. 58) because of 
open circuit. Then go to Step 13. 

NO :  Go to Step 9.

STEP 9. Check for short circuit to ground between power 
steering pressure switch connector B-122 (terminal No. 1) 
and ECM connector B-10 (terminal No. 58). 
Q: Is the harness wire in good condition? 

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code Registration Judgment Table <Vehicles 

with KOS> 

P.42B-15

 or GROUP 42C, Diagnosis 

− ID 

Codes Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

. Then go to Step 13.

NO :  Repair it. Then go to Step 13.

AK604040

ECM

AB

Body side harness 

MB992110

AK604213

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

AB

Power plant ECU
check harness connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-534

STEP 10. Check harness connector B-10 at ECM for 
damage. 
Q: Is the harness connector in good condition? 

YES : Go to Step 11.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 13.

STEP 11. Check for harness damage between power 
steering pressure switch connector B-122 (terminal No. 1) 
and ECM connector B-10 (terminal No. 58). 
Q: Is the harness wire in good condition? 

YES : Go to Step 12.
NO :  Repair it. Then go to Step 13.

STEP 12. Replace the power steering pressure switch. 
(1) Replace the power steering pressure switch. 
(2) Check the trouble symptoms. 
(3) Read in the diagnostic trouble code (DTC). 
Q: Is DTC P0551 set?

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code Registration Judgment Table <Vehicles 

with KOS> 

P.42B-15

 or GROUP 42C, Diagnosis 

− ID 

Codes Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

. Then go to Step 13.

NO :  Go to Step 13.

STEP 13. Using scan tool MB991958, check data list item 
83: Power Steering Pressure Switch. 
(1) Start the engine and run at idle. 
(2) Set scan tool MB991958 to the data reading mode for item 

83, 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. 

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

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