Mitsubishi Galant 9G. Manual — part 1142
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-868
.
CIRCUIT OPERATION
• A battery positive voltage is applied to the power
steering pressure switch output terminal (terminal
No. 1) from the PCM (terminal No. 78) 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 fluc-
tuate between 0 and 12 volts.
• 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 driv-
ing.
.
DESCRIPTIONS OF MONITOR METHODS
Power steering pressure switch changes from off to
on more than 10 times for 1 second.
.
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
.
AK303161
AB
POWER STEERING
PRESSURE SWITCH
B-31 (B)
CONNECTOR: B-31
AK303119
CONNECTOR: B-21
PCM
AC
AIR CLEANER
B-21(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-869
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 30°C
(86
°F).
• Vehicle speed is higher than 50 km/h (31 mph).
Judgment Criteria
• The ON/OFF frequency of a power steering pres-
sure switch is 10 Hz or more for 20 seconds.
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Power steering pressure switch failed.
• Incorrect power steering fuid level.
• Incorrect oil pump pressure.
• Harness damage in power steering pressure
switch circuit, or connector damage.
• PCM failed.
START
END
NO
NO
YES
YES
YES
NO
MALFUNCTION
GOOD
CONTINUOUS FAILURE
FOR 20secs
FREQUENCY > 10Hz
MONITORING
CONDITIONS
AK302410
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-870
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
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 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 sensor 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
.
NO : Go to Step 2.
STEP 2. Check the power steering fluid level.
Refer to GROUP 37, On-Vehicle Service
− Fluid Level Check
Q: Are there any abnormalities?
YES : Repair it. Then go to Step 7.
NO : Go to Step 3.
STEP 3. Check the power steering pressure switch.
Refer to GROUP 37, On-Vehicle Service
− Power Steering
Pressure Switch Check
.
Q: Are there any abnormalities?
YES : Replace the power steering pressure switch. Then go
to Step 7.
NO : Go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-871
STEP 4. Check the oil pump pressure .
Refer to GROUP 37, On-Vehicle Service
− Oil Pump Pressure
Q: Are there any abnormalities?
YES : Repair it. Then go to Step 7.
NO : Go to Step 5.
STEP 5. Check harness connector B-31 at the power
steering pressure switch and harness connector B-21 at
PCM for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 7.
AK303162
1
AB
POWER STEERING
PRESSURE SWITCH
B-31 (B)
CONNECTOR: B-31
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303018
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
CONNECTOR: B-21
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
B-21 (B)
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