Mitsubishi Grandis. Manual — part 136

SPECIAL TOOLS

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-6

SPECIAL TOOLS

M1549000300764

SPECIAL TOOLS

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-7

Tool

Number

Name

Use

MB991955
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991825
F: MB991826

MUT-III sub-assembly
A: Vehicle
Communication
Interface (V.C.I.)
B: MUT-III USB cable
C: MUT-III main
harness A (Vehicles
with CAN
communication
system)
D: MUT-III main
harness B (Vehicles
without CAN
communication
system)
E: MUT-III measure
adapter
F: MUT-III trigger
harness

SWS communication line check
(ECU check and service data)

CAUTION

MUT-III main harness B
(MB991911) should be used.
MUT-III main harness A should
not be used for this vehicle.

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

A

B

C

D

E

F

DO NOT USED

TROUBLESHOOTING

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-8

TROUBLESHOOTING

PRIOR TO TROUBLESHOOTING

M1549014700486

Before carrying out troubleshooting, check the
following two items.

• Make sure that the ETACS-ECU, the junction

block (J/B), the front-ECU and the engine
compartment relay box are connected securely.

MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222

Harness set
A: Check harness
B: LED harness
C: LED harness
adapter
D: Probe

Continuity check and voltage
measurement at harness wire or
connector
A: For checking connector pin
contact pressure
B: For checking power supply
circuit
C: For checking power supply
circuit
D: For connecting a locally
sourced tester

MB991813
A: MB991806
B: MB991812
C: MB991822

SWS monitor kit
A: SWS monitor
cartridge
B: SWS monitor
harness (for
column-ECU)
C: Probe harness

SWS communication line check
(ECU check and service data)

MB991529

Diagnosis code check
harness

Input signal check by using a
voltmeter

Tool

Number

Name

Use

MB991223

A

B

C

D

AC

B991813

A

B

C

MB991529

TROUBLESHOOTING

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-9

• Check that the system fuses and fusible links are

not burned out.

STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING

M1549000500672

1. Gather information about the problem from the

customer.

2. Verify that the condition described by the

customer exists.
NOTE: If an error occurs in the SWS
communication line, the ECU isolated from the
communication line performs a fail-safe or backup
operation, so the problem may not match the one
shown in the Trouble Symptom Chart. However,
the cause of the failure can be tracked down by
performing the following troubleshooting with the
SWS monitor.

3. Confirming version number and destination

Check whether the SWS version number (0) and
destination (EU W/O DRL) meet the vehicle
specifications. If they are different, replace the
ETACS-ECU with a correct one.

4. ECU check by using the SWS monitor

Check whether the communication status of the
input- or output-signal-side ECU associated with
the defective function is normal.

• If "OK " is displayed for all related ECUs, they

communicate with each other normally and the
input or output signal circuit system may be
defective. Therefore, check SWS monitor service
data.

• If "NG" is displayed for any of the related ECUs,

something may be wrong with the ECU for which
"NG" appears, its power supply or earthing
system, or a wiring harness or connector
between the SWS monitor and the ECU. Check
the wiring harness and connectors associated
with the ECU and examine the ECU itself.

5. SWS monitor data list

Select the defective function from the
function-specific diagnostic menu, and check the
service data that appears for each function item.
This allows you to check whether the transmission
data is normal or not. You can judge which circuit
is the cause of the trouble, input circuit or output
circuit.

AC211883

OK

OK

OK

NG

NG

NG

AB

1.

2.

3.

Check that the ETACS-ECU is applicable for the

vehicle specifications.

If the ECU is not applicable for them,

replace it with correct one.

Check the power supply circuit for the ECU

communication lines and repair if necessary.

4.

5.

7.

6.

Gather information about the problem
from the customer.

Verify that the condition described
by the customer exists.

ECU check on the SWS monitor

Confirming version number and destination

Check the data list by using the SWS monitor.

Check of output signal circuit system

Check of input signal circuit system