Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 121
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-183
STEP 1. Using scan tool MB991502, check data list item 22:
Crankshaft Position 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 and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item
22, Crankshaft Position Sensor.
•
The tachometer and engine speed indicated on the scan
tool should much.
(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. Using the oscilloscope, check the crankshaft
position sensor.
(1) Do not disconnect the crankshaft position sensor connector
B-20.
(2) Connect the oscilloscope probe to terminal 2 of the
crankshaft position sensor by backprobing.
NOTE: Connect the oscilloscope probe to terminal 89 <M/
T> or terminal 45 <A/T> by backprobing when measuring
with the ECM or PCM connector.
(3) Start the engine and run at idle.
(4) Check the waveform.
•
The waveform should show a pattern similar to the
illustration.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
YES : Go to Step 3.
NO : Go to Step 5.
AKX01177
16 PIN
MB991502
AB
AKX01500
CRANKSHAFT POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
1 2
3
AB
OSCILLO-
SCOPE
PROBE
AKX01559AB
NORMAL WAVEFORM
2 ENGINE REVOLUTIONS
5V