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Mitsubishi Outlander GS45X. Manual - part 913

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-585

DTC P0551: Power Steering Pressure Switch Circuit Range/Performance

CIRCUIT OPERATION

• A battery positive voltage is applied to the power

steering pressure switch output terminal (terminal
No. 1) from the ECM (terminal No. 58) via the
resistor in the ECM.

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 ECM.

• 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 fluc-
tuate between 0 and 12 volts.

• While driving with the steering wheel held

straight, the power steering pressure switch turns
"OFF".

• The ECM checks whether the power steering

pressure switch turns "OFF" or "ON" during driv-
ing.

AK703256

3 4 5 6 7 8 9 10 11 12 13 14 15 16

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

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

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

POWER STEERING PRESSURE SWITCH CIRCUIT

POWER STEERING
PRESSURE SWITCH

B-10

B-122

(MU801211)

OFF

ENGINE
CONTROL
MODULE

LIGHT GREEN

AK900157 AD

B-122 (B)

Connector: B-122

AK700401AB

ECM

B-10 (GR)

Connector: B-10

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-586

DESCRIPTIONS OF MONITOR METHODS

Power steering pressure switch stays "ON" during

specified go/stop operations.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Engine coolant temperature sensor

DTC SET CONDITIONS
Logic Flow Chart

Check Conditions

• Engine coolant temperature is higher than 20°C

(68

°F).

• Repeat 10 times or more: drive*

, stop*

Drive*

• Vehicle speed is more than 50 km/h (31

mph) lasting 4 seconds or more.

Stop*

Yes

Monitoring

conditions

End

Malfunction

Good

Start

Power steering

switch ON

Yes

Go/stop operation

for specified times

Yes

AK604346

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-587

• Vehicle speed is less than 1.5 km/h (1

mph).

Judgement Criterion

• 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.

• Connector damage.

• Harness damage.

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB992110: Power Plant ECU Check Harness

STEP 1. Using scan tool MB991958, check data list item 83:
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

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.

(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.00-15

NO : Go to Step 2.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-588

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 and harness connector B-10 at ECM 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 9.

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,