Mitsubishi Grandis. Manual - part 728
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-163
STEP 14. Perform output wave pattern
measurement at B-121 crank angle sensor
intermediate connector (Using an oscilloscope).
• Use special tool test harness (MB991658) to
connect connector, and measure at pick-up
harness.
• Engine: Idling
• Transmission: Neutral <M/T> or P range <A/T>
• Voltage between terminal No. 2 and earth.
OK: Waveforms should be displayed on
Inspection procedure using an oscilloscope
(Refer to
), its maximum value
should be 4.8 V or more, and its minimum
value should be 0.6 V or less with no noise in
waveform.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 15 .
STEP 15. Connector check: B-15X engine control
relay connector
Q: Is the check result normal?
YES :
Go to Step 16 .
NO :
Repair or replace.
STEP 16. Check harness between B-121 (terminal
No. 1) crank angle sensor intermediate connector
and B-15X (terminal No. 1) engine control relay
connector.
NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 17 .
NO :
Repair.
AK304267
1
2
3
B-121 (GR)
AC
Connector: B-121
Harness
side connector
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks
AK304267
1
2
3
B-121 (GR)
AC
Connector: B-121
Harness
side connector
AK300967
2
1
3
4
AC
Harness side
connector
B-15X
Connector: B-15X
Relay box’s
triangle marks