Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 449
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-87
CIRCUIT OPERATION
The crankshaft position sensor power is supplied
from the MFI relay (terminal 3), and the ground
(terminal 1) is provided on the vehicle body. The
PCM supplies a five-volts voltage to crankshaft
position sensor output terminal (terminal 2). The
crankshaft position sensor generates a pulse signal
when the output terminal is opened and grounded.
The sensor is opened and closed as the flat on the
crankshaft passes by.
DTC SET CONDITIONS
If no output pulse is detected from the crankshaft
position sensor for five seconds or more while driving
at 25 km/h (16 mph) or more, it is judged that there is
an open circuit in the crankshaft position sensor and
diagnostic trouble code number "21" is sent.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set:)
•
Malfunction of the crankshaft position sensor
circuit
•
Damaged harness, connector
•
Malfunction of the PCM
DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)
AC004927AB
CONNECTOR: B-20
<3.0L ENGINE>
AC001729 AM
CONNECTOR: C-07
AC001657
CONNECTOR: C-54 <2.4L ENGINE> OR
C-55 <3.0L ENGINE>
PCM
AL
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-88
STEP 1. Using scan tool MB991502, check data list item 21:
Crankshaft Position Sensor.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) With the gear selector lever in the "P" position, start the
engine and run at idle.
(3) Set scan tool MB991502 to data reading mode for item 21:
Crankshaft Position Sensor.
•
When the accelerator pedal is not depressed (throttle
valve is fully closed) the display should be "600 to 900 r/
min."
•
With the accelerator pedal depressed, the engine speed
should increase according to engine speed.
Q: Is the sensor operating properly?
YES : This malfunction is intermittent. Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
−
How to Cope with Intermittent Malfunction
NO : Go to Step 2.
AC001252
MB991502
16 PIN
AB
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-89
STEP 2. Using the oscilloscope, check the waveform at
crankshaft position sensor connector B-20.
(1) Do not disconnect connector B-20.
(2) Connect an oscilloscope probe to crankshaft position
sensor connector B-20 terminal 2 by backprobing.
(3) With the gear selector lever in the "P" position, start the
engine and run at idle.
AC004926AB
CONNECTOR: B-20
<2.4L ENGINE>
AC004927AB
CONNECTOR: B-20
<3.0L ENGINE>
AC001805
OSCILLOSCOPE
PROBE
B-20 CONNECTOR
HARNESS SIDE VIEW
AC
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-90
(4) Check the waveform.
•
The waveform should show a pattern similar to the
illustration. The maximum value should be 4.8 volts and
more and the minimum value 0.6 volts and less.
(5) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the waveform normal?
YES : Go to Step 3.
NO : Go to Step 5.
AC002215AB
NORMAL WAVEFORM
<2.4L ENGINE>
5 V
2 ENGINE REVOLUTIONS
2 ENGINE REVOLUTIONS
<3.0L ENGINE>
5 V
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст