Mitsubishi Eclipse. Manual — part 291
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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.
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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
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
![](/vehicles/winoney/grold/thow/lay.png)
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
. 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
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
. 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
![](/vehicles/winoney/grold/thow/lintul.png)
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
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