13A-10
MPI – TROUBLESHOOTING
Continued from the previous page
Replace the engine ECU
Check connector B-19X
Inspect the harness between the
exhaust cam position sensor and
the engine control relay
• Check if the power wire is
damaged
Check the exhaust cam position
sensing cylinder
Check connector C-49 and C-50
Check that the problem has been
solved
Inspect the harness between the
exhaust cam position sensor and
the engine ECU
• Check if the output wire is
damaged
Temporary malfunction (Ref
Section 00: Dealing with
temporary malfunctions)
Measurement of the output wave
at the exhaust cam position
sensor connector B-115 (using an
oscilloscope)
• Use test harness (MB991709),
connect it to the connector, and
take measurements at the pick-
up harness component
• Engine: idling
•Voltage across earth at 2
OK: An output wave as
described on P.13A-25
(Main points for
oscilloscope testing) is
produced, with the
maximum value in excess
of 4.8V and the minimum
value less than 0.6V.
There should be no noise
in the output wave form.
Check that the problem has been
solved
OK
OK
NG
NG
OK
OK
OK
Replace the exhaust cam position
sensor
NG
OK
Replace the exhaust cam position
sensing cylinder
Temporary malfunction (Ref
Section 00: Dealing with
temporary malfunctions)
OK
OK
Repair
Repair
NG
NG
Repair
NG
Repair
NG
NG
OK
