Mitsubishi Eclipse. Manual - part 568

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-815

CIRCUIT OPERATION

• A battery positive voltage is applied to the power

steering pressure switch output terminal (terminal
1) from the ECM (terminal 54) or PCM (terminal
52) <A/T> via the resistor in the ECM <M/T> or
PCM <A/T>.

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 <M/T> or PCM
<A/T>.

• 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 12 volts and 0 volt.

• While driving with the steering wheel held

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

• The ECM <M/T> or PCM <A/T> checks whether

the power steering pressure switch turns "OFF"
or "ON" during driving.

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

AK300083

CONNECTOR: B-19

POWER
STEERING
PRESSURE
SWITCH

POWER STEERING
OIL PUMP

B-19

AK300244

CONNECTOR: C-55 <A/T>

PCM

C-55 (GR)

AK300091

CONNECTOR: C-58 <M/T>

ECM

C-58 (GR)

AK300087

CONNECTOR: B-47

B-47 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-816

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 (0.93 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: Scan Tool (MUT-III Sub Assembly)

YES

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) <3.0L>

13B-817

• MB991824: V.C.I.

• 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. Check 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

MB991911

16-PIN

MB991827

MB991824

AK300437

CONNECTOR: B-19

B-19

HARNESS CONNECTOR:
COMPONENT SIDE

AK000259AG

B-19 HARNESS
CONNECTOR:
HARNESS SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-818

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

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.

AK300437

CONNECTOR: B-19

B-19

HARNESS CONNECTOR:
COMPONENT SIDE

AK300810

MB991911

16-PIN

MB991827

MB991824

AK300437

CONNECTOR: B-19

B-19

HARNESS CONNECTOR:
COMPONENT SIDE

Content .. 566 567 568 569 ..