Mitsubishi Eclipse. Manual — part 294
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-669
.
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
.
AK300104
B-19
POWER
STEERING
PRESSURE
SWITCH
AB
CONNECTOR: B-19
AK300060
ECM
CONNECTOR: C-53 <M/T>
AH
C-53 (G)
AK300060AB
C-54 (GR)
PCM
CONNECTOR: C-54 <A/T>
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-670
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-ll 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.
• ECM failed.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
START
END
NO
NO
YES
YES
YES
NO
MALFUNCTION
GOOD
CONTINUOUS FAILURE
FOR 20secs
FREQUENCY > 10Hz
MONITORING
CONDITIONS
AK301790
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-671
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 INTRODUCTION, How to Use
Troubleshooting/Inspection Service Points
NO : Go to Step 2.
STEP 2. Check the power steering fluid level.
Refer to GROUP 37A, 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 37A, 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.
STEP 4. Check the oil pump pressure .
Refer to GROUP 37A, On-Vehicle Service - Oil Pump Pressure
Test
Q: Are there any abnormalities?
YES : Repair it. Then go to Step 7.
NO : Go to Step 5.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-672
STEP 5. Check harness connector B-19 at the power
steering pressure switch and harness connector C-53 at
ECM or C-54 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
Connector Inspection
. Then go to Step 7.
AK300105
1
B-19
AB
CONNECTOR: B-19
HARNESS
CONNECTOR:
COMPONENT SIDE
AK300417
34 33 32
36 35
37
42
45
31
39
38
46
40
41
43
44
CONNECTOR: C-53 <M/T>
C-53 (G)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK300412
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
C-54 (GR)
CONNECTOR: C-54 <A/T>
AB
HARNESS CONNECTOR:
COMPONENT SIDE
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст