Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 288
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-351
DTC SET CONDITIONS
Check Conditions
•
Two seconds or more have passed the starting
sequence was completed.
•
The throttle valve is opener than its idling
position.
•
Engine speed is at between 2,100 and 4,000 r/
min.
•
Volumetric efficiency is at between 40 and 70
percent.
Judgement Criteria
•
Vehicle speed sensor output voltage has not
changed (no pulse signal is input) for 2 seconds.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
•
Vehicle speed sensor failed.
•
Open or shorted vehicle speed sensor circuit, or
loose connector.
•
ECM failed.
DIAGNOSIS
Required Special Tools
MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check data list item 24:
Vehicle Speed Sensor.
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.
(3) Set scan tool MB991502 to the data reading mode for item
24, Vehicle Speed Sensor.
•
Check that the speedometer and MUT-II display speed
match when traveling at a vehicle speed of 40km/h
(25mph).
(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 0, How to Use Troubleshooting/
Inspection Service Points (
NO : Go to Step 2.
STEP 2. Check speed meter.
Q: Is the speed meter functioning?
YES : Go to Step 3.
NO : Go to Step 8.
AKX01177
16 PIN
MB991502
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-352
STEP 3. Using the oscilloscope, check the sensor output
voltage at ECM connector C-62.
(1) Do not disconnect the ECM connector C-62.
(2) Disconnect the combination meter connector and auto-
cruise control-ECU connector.
(3) Connect the oscilloscope probe to terminal 80 of the ECM
by backprobing.
(4) Start the engine.
(5) Check the waveform.
•
The waveform should show a pattern similar to the
illustration while the vehicle is being moved.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
YES : Go to Step 4.
NO : Go to Step 6.
STEP 4. Check connector C-62 at ECM for damage.
Q: Is the connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 17.
AK000257
71 72
73 74
78
80 81
79
82 83 84 85 86 87 88 89
75 76
91 92 93
94 95
96
98
99
97
AK000257AB
ECM CONNECTOR
77
90
100
OSCILLOSCOPE
AKX01562
AKX01562
(ms)
0
(V)
NORMAL WAVEFORM
AB
AK000310
CONNECTOR:C-62
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-353
STEP 5. Using scan tool MB991502, check data list item 24:
Vehicle Speed Sensor.
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.
(3) Set scan tool MB991502 to the data reading mode for item
24, Vehicle Speed Sensor.
•
Check that the speedometer and MUT-II display speed
match when traveling at a vehicle speed of 40km/h
(25mph).
(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 0, How to Use Troubleshooting/
Inspection Service Points (
NO : Replace the ECM. Then go to Step 17.
STEP 6. Check the sensor supply voltage at ECM
connector C-62 by backprobing
(1) Do not disconnect the ECM connector C-62.
(2) Disconnect the vehicle speed sensor connector B-39.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 80 and ground by
backprobing.
•
Voltage should be between 4.8 and 5.2 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 7.
NO : Replace the ECM. Then go to Step 17.
STEP 7. Check connector C-62 at ECM for damage.
Q: Is the connector in good condition?
YES : Check connector B-36 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 vehicle speed sensor
connector B-39 terminal 3 and ECM connector C-62
terminal 80 because of open circuit. Then go to Step
17.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 17.
AKX01177
16 PIN
MB991502
AB
AK000258
71 72
73 74
78
80 81
79
82 83 84 85 86 87 88 89
75 76
91 92 93
94 95
96
98
99
97
AK000258AC
C-62 CONNECTOR
HARNESS SIDE VIEW
77
90
100
AK000310
CONNECTOR:C-62
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-354
STEP 8. Check connector B-39 at vehicle speed sensor for
damage.
Q: Is the connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 17.
STEP 9. Check the power supply voltage at vehicle speed
sensor harness side connector B-39.
(1) Disconnect the connector B-39 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 10.
NO : Check connectors B-36, C-28, C-78, C-101 and C-
104 at intermediate connector for damage, and repair
or replace as required. Refer to GROUP 00E,
Harness Connector Inspection (
). If
intermediate connectors are in good condition, repair
harness wire between ignition switch connector C-87
terminal 2 and vehicle speed sensor connector B-39
terminal 1 because of open circuit or short circuit to
ground. Then go to Step 17.
STEP 10. Check the continuity at vehicle speed sensor
harness side connector B-39.
(1) Disconnect the connector B-39 and measure at the harness
side.
(2) Check for the continuity between terminal 2 and ground.
•
Should be less than 2 ohm.
Q: Is the continuity normal?
YES : Go to Step 11.
NO : Check connector B-36 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 vehicle speed sensor
connector B-39 terminal 2 and ground because of
open circuit or harness damage. Then go to Step 17.
AK000218AC
CONNECTOR:B-39
AKX01425AD
1
2
3
B-39 HARNESS
SIDE CONNECTOR
AKX01426AD
1
2
3
B-39 HARNESS
SIDE CONNECTOR
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