Mitsubishi Galant. Manual — part 283
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-357
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.
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.
AC003081 AB
16 PIN
MB991502
AK000259
B-44 CONNECTOR
HARNESS SIDE VIEW
1
AC
ACX02522
CONNECTOR:B-44
POWER
STEERING
PRESSURE
SWITCH
AF
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-358
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.
STEP 5. Check connector B-44 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(
). Then go to Step 14.
STEP 6. Check the power supply voltage at power steering
pressure switch harness side connector B-44.
(1) Disconnect the connector B-44 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.
AC003081 AB
16 PIN
MB991502
ACX02522
CONNECTOR:B-44
POWER
STEERING
PRESSURE
SWITCH
AF
AK000260
B-44 HARNESS
SIDE CONNECTOR
1
AC
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-359
STEP 7. Check the power supply voltage at PCM connector
C-40 by backprobing
(1) Do not disconnect the PCM connector C-40.
(2) Disconnect the power steering pressure switch connector
B-44.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 52 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.
STEP 8. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?
YES : Check connector B-24 at intermediate connector for
damage, and repair or replace as required. Refer to
GROUP 00E, Harness Connector Inspection(
). If intermediate connector is in good condition,
repair harness wire between power steering pressure
switch connector B-44 terminal 1 and PCM connector
C-40 terminal 52 because of open circuit. Then go to
Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection(
). Then go to Step 14.
STEP 9. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection(
). Then go to Step 14.
AK000309
C-40 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
AC
AK000280
CONNECTOR : C-40
PCM
AV
AK000280
CONNECTOR : C-40
PCM
AV
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-360
STEP 10. Check for short circuit to ground between power
steering pressure switch connector B-44 terminal 1 and
PCM connector C-40 terminal 52.
NOTE: Check harness after checking intermediate connector
B-24. If intermediate connector is damaged, repair or replace
them. Refer to GROUP 00E, Harness Connector
Inspection(
). Then go to Step 14.
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.
STEP 11. Replace the power steering pressure switch.
(1) Replace the power steering pressure switch.
(2) Check the trouble symptoms.
(3) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0551 is output?
YES : Go to Step 12.
NO : Go to Step 14.
STEP 12. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 13.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection(
). Then go to Step 14.
ACX02522
CONNECTOR:B-44
POWER
STEERING
PRESSURE
SWITCH
AF
AK000280
CONNECTOR : C-40
PCM
AV
ACX02522
CONNECTOR:B-44
POWER
STEERING
PRESSURE
SWITCH
AF
AK000280
CONNECTOR : C-40
PCM
AV
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