![](../../../img/00/AC310120AB00ENG.png)
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Connect the M.U.T.-III to the
16-pin diagnosis connector, and read the diagnosis
code.
note |
For details on how to use the
M.U.T.-III, refer to the
"M.U.T.-III operation manual."
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1.Ensure that the ignition switch is at the
"LOCK" (OFF). 2.Start up the personal
computer. 3.Connect M.U.T.-III USB cable MB991827
to special tool Vehicle Communication Interface (V.C.I.)
MB991824 and the personal computer. 4.Connect
M.U.T.-III main harness A MB991910 to the
V.C.I. 5.Connect the M.U.T.-III main harness A to
the diagnosis connector. 6.Turn the V.C.I. power
switch to the "ON" position.
note |
When the V.C.I. is energized,
the V.C.I. indicator lamp will be illuminated in
a green colour.
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7.Start the M.U.T.-III system on the personal
computer and turn the ignition switch to the "ON"
position. 8.Read the diagnosis
code. 9.Disconnecting the M.U.T.-III is the
reverse of the connecting sequence, making sure that the
ignition switch is at the "LOCK" (OFF).
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![](../../../img/00/AC310120AB00ENG.png)
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Connect the M.U.T.-III to the
diagnosis connector, and erase the diagnosis code. The
procedure is the same as "How to Read Diagnosis Code ."
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![](../../../img/00/AC310120AB00ENG.png)
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1.Connect the M.U.T.-III to
the diagnosis connector, and erase the diagnosis
code. 2.If the M.U.T.-III buzzer sounds once when
each switch is operated (ON/OFF), the input signal for
that switch circuit system is normal.
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![](../../../img/00/AC310121AB00ENG.png)
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1.Use the special tool
diagnosis code check harness (MB991529) to connect the ETACS
terminal (terminal 9) and the earth terminals (terminals 4
and 5) of the diagnosis connector to the voltage
meter. 2.If the needle of the voltage meter
flickers once when each switch is operated (ON/OFF),
the input signal for that switch circuit system is
normal.
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Turn the ignition switch to the
"LOCK" (OFF) position when connecting and disconnecting the
connectors. Turn the ignition switch to "ON" when measuring,
unless there are instructions to the contrary.
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![](../../../img/00/AC105597AB00ENG.png)
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Use the special tools such as test
harness, harness connector or check harness.
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![](../../../img/00/AC105598AH00ENG.png)
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Inspect by inserting a test probe
from the harness side. If the connector is too small to
insert a test probe (e.g. control unit connector), do not
insert it forcibly. Use special tool MB992006 (extra fine
probe).
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![](../../../img/00/AC105599AB00ENG.png)
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Use the Check Harness (MB991219) of
the special tool Harness Set (MB991223).
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![](../../../img/00/AC105600AA00ENG.png)
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Touch the pin directly with the
test bar.
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![](../../../img/00/AC300896AB00ENG.png)
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- Connector is disconnected or improperly
connected
- Connector pins are pulled out
- Due to harness tension at terminal section
- Low contact pressure between male and female
terminals
- Low connection pressure due to rusted terminals or
foreign matter lodged in terminals
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![](../../../img/00/AC300898AA00ENG.png)
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If the connector pin stopper is
damaged, the terminal connections (male and female pins)
will not be perfect even if the connector body is connected,
and the pins may pull out of the reverse side of the
connector. Therefore, gently pull the harnesses one by one
to make sure that no pins pull out of the
connector.
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![](../../../img/00/AC300899AB00ENG.png)
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Use special tool inspection harness
(MB991219) (connector pin connection pressure inspection
harness of the inspection harness set) to inspect the
engagement of the male pins and female pins. (Pin drawing
force: 1 N or more)
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![](../../../img/00/AC300900AB00ENG.png)
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Remove the blown fuse and measure
the resistance between the load side of the blown fuse and
the earth. Close the switches of all circuits which are
connected to this fuse. If the resistance is almost 0
Ω at this time, there is a short somewhere between
these switches and the load. If the resistance is not 0
Ω, there is no short at the present time, but a
momentary short has probably caused the fuse to blow. The
main causes of a short circuit are the
following.
- Harness being clamped by the vehicle body
- Damage to the outer casing of the harness due to
wear or heat
- Water getting into the connector or
circuitry
- Human error (mistakenly shorting a circuit,
etc.)
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![](../../../img/00/AC300901AA00ENG.png)
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Intermittent malfunctions often
occur under certain conditions, and if these conditions can
be ascertained, determining the cause becomes simple. In
order to ascertain the conditions under which an
intermittent malfunction occurs, first ask the customer for
details about the driving conditions, weather conditions,
frequency of occurrence and trouble symptoms, and then try
to recreate the trouble symptoms. Next, ascertain whether
the reason why the trouble symptom occurred under these
conditions is due to vibration, temperature or some other
factor. If vibration is thought to be the cause, carry out
the following checks with the connectors and components to
confirm whether the trouble symptom occurs. The objects to
be checked are connectors and components which are indicated
by inspection procedures or given as probable causes (which
generates diagnosis codes or trouble
symptoms).
- Gently shake the connector up, down and to the left
and right.
- Gently shake the wiring harness up, down and to the
left and right.
- Gently rock each sensor and relay, etc. by
hand.
- Gently shake the wiring harness at suspensions and
other moving parts.
note |
If determining the cause is
difficult, the drive recorder function of the
M.U.T.-III can also be used. (For details on how
to use the M.U.T.-III, refer to the "M.U.T.-III
operation manual).
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