Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 152

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-307

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 ECM (terminal 37) 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>.

AK000670

34

33

32

36

35

37

42

45

31

39

38

46

40 41

1

43 44

YELLO

W

ENGINE CONTROL
MODULE(ECM)<M/T>
OR
POWERTRAIN CONTROL
MODULE(PCM)<A/T>

C-53<M/T>
(MU803771)

C-54<A/T>
(MU803781)

37<M/T>
52<A/T>

POWER STEERING
PRESSURE SWITCH

B-19

1

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

46

45

44

58 59

60 61 62 63

64 65 66

47

41

ACX02520

CONNECTOR : B-19

POWER STEERING
PRESSURE SWITCH

AD

AK000280

C-53,C-54

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-53<M/T>,C-54<A/T>

BH

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-308

•

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.

•

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.

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

°

C

(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.

•

ECM failed. <M/T>

•

PCM failed. <A/T>

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.00-6

).

NO : Go to Step 2.

AKX01177

16 PIN

MB991502

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-309

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 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-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 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.00E-2

).

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

AK000259AB

1

B-19 CONNECTOR
HARNESS
SIDE VIEW

ACX02520

CONNECTOR : B-19

POWER STEERING
PRESSURE SWITCH

AD

AKX01177

16 PIN

MB991502

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-310

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.

STEP 6. Check 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 1 and ground.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 11.
NO : Go to Step 7.

STEP 7. Check the power supply voltage at ECM connector
C-53 <M/T> or PCM connector C-54 <A/T> by backprobing
(1) Do not disconnect the ECM connector C-53 <M/T> or PCM

connector C-54 <A/T>.

(2) Disconnect the power steering pressure switch connector

B-19.

(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 37 <M/T> or 52 <A/

T> and ground by backprobing.

•

Voltage should be between battery positive voltage.

(5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 8.
NO : Go to Step 9.

ACX02520

CONNECTOR : B-19

POWER STEERING
PRESSURE SWITCH

AD

AK000260AB

1

B-19 HARNESS
SIDE CONNECTOR

AK000308

3132 33 34 35 36 37 38

39 40 41 42 43 44 45 46

AC

<M/T>

C-53 CONNECTOR
HARNESS SIDE VIEW

AK000309

C-54 CONNECTOR
HARNESS SIDE VIEW

46
57
66

45
56
65

44
55

43
49

54

64

42
48
59

41
47
58

53
63

52
62

51
61

50
60

AD

<A/T>