Mitsubishi L200. Manual — part 826
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-63
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Check the ETACS-ECU connector, and
repair if necessary. If the ETACS-ECU
connector is in good condition, go to Step
26.
STEP 26. M.U.T.-III CAN bus diagnostics (retest
the system)
Diagnose CAN bus lines, and check if M.U.T.-III
screen shows normal state.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Check the ETACS-ECU connector, and
repair if necessary. If the ETACS-ECU
connector is in good condition, replace the
ETACS-ECU.
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-64
Diagnosis Item 3: Diagnose shorts between CAN_H and L lines
CAUTION
When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White
Y : Yellow SB : Sky blue BR : Brown O : Orange GR : Grey
R : Red P : Pink V : Violet PU : Purple SI : Silver
A/T-ECU
DIAGNOSIS
CONNECTOR
ENGINE-ECU
STEERING
WHEEL
SENSOR
G AND
YAW RATE
SENSOR
A/C-ECU
ABS-ECU
ASTC-ECU
ETACS-ECU
RV METER
NOTE
:VEHICLES WITH ABS
:VEHICLES WITH ASTC
:VEHICLES WITH RV METER
:VEHICLES WITH AUTOMATIC-A/C
:LHD
:RHD
:A/T
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-65
FUNCTION
The M.U.T.-III judges a short between CAN_H and
CAN_L line when all data from ECU cannot be
received while checking periodically sent data from
each ECU even if the voltage is normal.
TROUBLE JUDGEMENT CONDITIONS
Short circuit may be present between the CAN_L
and H lines when the resistance between the CAN
bus lines (CAN_L and H lines) is less than 2
Ω.
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-66
TROUBLESHOOTING HINTS
• Malfunction of the wiring harness
NOTE: The M.U.T.-III cannot receive all the periodi-
cally sent data from each ECU by the open circuit
of harness between the diagnosis connector, the
joint connector (CAN1) and the joint connector
(CAN2). In addition, the M.U.T.-III measures the
voltage itself and shows 2.5 V due to the open
circuit of harness. Therefore, it is judged as a
short between CAN_H and CAN_L line.
• Malfunction of the connector
• Malfunction of each ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-53 <LHD> or C-35
<RHD> intermediate connector
AC903853
Connector: C-53 <LHD>
BI
AC903865
Connector: C-35 <RHD>
AQ
CAUTION
The strand end of the twist wire should be within
10 cm from the connector. For details refer to
.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector.
STEP 2. Resistance measurement at C-53 <LHD>
or C-35 <RHD> intermediate connector.
CAUTION
A digital multimeter should be used. For details
refer to
CAUTION
The test wiring harness should be used. For
details refer to
.
AC903853
Connector: C-53 <LHD>
BI
AC903865
Connector: C-35 <RHD>
AQ
(1) Disconnect the connector, and measure at its
female-side intermediate connector (at the
instrument panel wiring harness side).
(2) Turn the ignition switch to the LOCK (OFF)
position.
CAUTION
When measuring the resistance, disconnect the
negative battery terminal. For details refer to
.
(3) Ensure that the negative battery terminal is
disconnected.
AC204738SG
Test harness
Test harness
Female side: C-53 <LHD> or C-35 <RHD>
(4) Resistance between C-53 <LHD> or C-35
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