MPI <4G6> -
Troubleshooting
13A-6
INSPECTION USING MUT-
II
DATA LIST AND ACTUATOR
TESTING
1. Carry out inspection by means of the data list and the
actuator test function. If there is an abnormality, check
and repair the chassis harnesses and components.
2. After repairing, re-check using the MUT-
II
and check that
the abnormal input and output have returned to normal
as a result of the repairs.
3. Erase the diagnosis code memory.
4. Remove the MUT-
II
, and then start the engine again and
carry out a road test to confirm that the problem has
disappeared.
FREEZE FRAME DATA
When
the
engine-ECU
<M/T>
or
engine-A/T
-ECU
<A/T>
detects a malfunction and stores a diagnosis code, it also
stores a current status of the engine. This function is called
“Freeze frame data.” By analyzing this “freeze frame” data
with the MUT-
II
, an effective troubleshooting can be
performed.
The display items of freeze frame data are shown below.
Display item list
Data item Unit
Engine coolant temperature sensor _C
Engine speed r/min
Vehicle speed km/h
Long-term fuel compensation (long-term
fuel trim)
%
Short-term fuel compensation (short-term
fuel trim)
%
Fuel control condi- Open loop OL
tion
Closed loop CL
Open loop owing to
drive condition
OL-DRV.
Open loop owing to
system malfunction
OL-SYS.
Closed loop based
on one oxygen sen-
sor
CL-H02S
Calculation load value %
Diagnosis code during data recording -
NOTE
If malfunctions have been detected in multiple systems, store
one malfunction only, which has been detected first.
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