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
AF
IDLE AIR
CONTROL MOTOR
AK000555AB
CONNECTOR : A-21X
MFI RELAY
AK000280
CONNECTOR : C-39
PCM
AW
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(
(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
1
YELLO
W
POWERTRAIN CONTROL
MODULE(PCM)
C-40
(MU803781)
52
POWER STEERING
PRESSURE SWITCH
B-44
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-44
AF
POWER
STEERING
PRESSURE
SWITCH
AK000280
CONNECTOR : C-40
PCM
AV
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
°
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.
•
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(
).
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(
). 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(
NO : Replace the PCM. Then go to Step 14.
AK000259
B-44 CONNECTOR
HARNESS SIDE VIEW
1
AC
ACX02520
CONNECTOR : B-44
AF
POWER
STEERING
PRESSURE
SWITCH
AC003081 AB
16 PIN
MB991502
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