Mitsubishi Galant. Manual - part 150

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-281

STEP 12. Check for harness damage between MFI relay
connector A-21X terminal 1 and idle air control motor
connector B-06 terminal 2, 5.
Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO : Repair it. Then go to Step 14.

STEP 13. Check for harness damage between idle air
control motor connector B-06 and PCM connector C-39.

a. Idle air control motor connector B-06 terminal 1 and PCM

connector C-39 terminal 14.

b. Idle air control motor connector B-06 terminal 3 and PCM

connector C-39 terminal 28.

c. Idle air control motor connector B-06 terminal 4 and PCM

connector C-39 terminal 15.

d. Idle air control motor connector B-06 terminal 6 and PCM

connector C-39 terminal 29.

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 14.
NO : Repair it. Then go to Step 14.

AK000555AB

CONNECTOR : A-21X

MFI RELAY

ACX02519

CONNECTOR : B-06

IDLE AIR
CONTROL MOTOR

AK000555AB

CONNECTOR : A-21X

MFI RELAY

AK000280

CONNECTOR : C-39

PCM

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-282

STEP 14. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,

Procedure 6

−

Other Monitor(

P.13A-5

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0507 is output?

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

DTC P0551: Power Steering Pressure Sensor Circuit Range/Performance

CIRCUIT OPERATION

•

A battery positive voltage is applied to the power
steering pressure switch output terminal (terminal
1) from the PCM (terminal 52) via the resistor in
the PCM.

TECHNICAL DESCRIPTION

•

The power steering pressure switch converts the
existence of a power steering load into a high/low
voltage, and inputs it into the PCM.

•

When the steering wheel is turned, hydraulic
pressure rises. The power steering pressure
switch closes, and the applied battery positive

voltage will be grounded. With this, the power
steering pressure switch output voltage will
fluctuate between 12 volts and 0 volt.

AK000473

YELLO

POWERTRAIN CONTROL
MODULE(PCM)

C-40
(MU803781)

POWER STEERING
PRESSURE SWITCH

B-44

42 43
48 49 50 51 52 53 54 55 56 57

58 59

60 61 62 63

64 65 66

ACX02520

CONNECTOR : B-44

POWER
STEERING
PRESSURE
SWITCH

AK000280

CONNECTOR : C-40

PCM

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-283

•

While driving with the steering wheel held
straight, the power steering pressure switch turns
"OFF."

•

The PCM checks whether the power steering
pressure switch turns "OFF" or "ON" during
driving.

DTC SET CONDITIONS

Check Conditions

•

Intake air temperature is higher than -10

C (14

F).

•

Barometric pressure is higher than 76 kPa (11
psi).

•

Engine coolant temperature is higher than 30

(86

F).

•

Drive for four seconds or more with the engine
speed at 2,500 r/min or more, the volumetric
efficiency at 55 percent or more, and vehicle
speed is 5 km/h (3.1 mph) or more. Stop the
vehicle [vehicle speed is 1.5 km/h (0.93 mph) or
less]. Repeat 10 times or more.

Judgment Criteria

•

Power steering pressure switch continues to be
"ON."

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 loose connector.

•

PCM failed.

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 27:
Power Steering Pressure Switch.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 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.00-8

NO : Go to Step 2.

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-284

STEP 2. Check the power supply voltage at power steering
pressure switch connector B-44 by backprobing
(1) Do not disconnect the connector B-44.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal 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.

STEP 3. Check connector B-44 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 MB991502, check data list item 27:
Power Steering Pressure Switch.

CAUTION

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.00E-2

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

AK000259

B-44 CONNECTOR
HARNESS SIDE VIEW

ACX02520

CONNECTOR : B-44

POWER
STEERING
PRESSURE
SWITCH

AC003081 AB

16 PIN

MB991502

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