Mitsubishi Grandis. Manual — part 152
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-70
Inspection Procedure A-4: Communication with the front-ECU is not possible.
CAUTION
Whenever the ECU is replaced, ensure that the
power supply circuit, the earthing circuit and the
communication circuit are normal.
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-71
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
IGNITION
SWITCH (IG2)
DIAGNOSIS
CONNECTOR
ETACS-ECU
POWER
SOURCE
FRONT-ECU
26
FUSIBLE
LINK
RELAY
BOX
FRONT SIDE
Front-ECU Power Supply and SWS Communication Circuit
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-72
COMMENTS ON TROUBLE SYMPTOM
It is suspected that the power supply circuit to the
front-ECU is defective, or the wiring harness
between the SWS monitor and the front-ECU or their
connector(s) is damaged. If the battery power supply
circuit to the ECU (terminal No.7 of the front-ECU) is
damaged, also check the power supply circuit from
the ignition switch (IG2) (terminal No.30 of the
front-ECU), and repair if necessary.
POSSIBLE CAUSES
• Malfunction of the front-ECU
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. ECU check by using the SWS monitor
Check that the power supply and earth lines to the
ETACS-ECU and the SWS communication lines are
normal.
• Ignition switch: OFF
ECUS TO BE CHECKED
• ETACS ECU
OK: "OK" is displayed on the "ETACS ECU"
menu.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to Inspection Procedure A-3
"Communication with the ETACS-ECU is
not possible
Step 2. Connector check: A-14X front-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the defective connector.
Step 3. Voltage measurement at A-14X front-ECU
connector.
(1) Disconnect the connector, and measure at the
relay box side.
(2) Voltage between A-14X front-ECU connector
No.7 and body earth
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 4.
Step 4. Check the wiring harness between A-14X
front-ECU connector terminal No.7 and the
fusible link (26).
• Check the power supply line for open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
AC311521AB
Connector: A-14X
Relay box side
AC311521AB
Connector: A-14X
Relay box side
AC310507CJ
Connector A-14X
(Harness side)
AC311521AB
Connector: A-14X
Relay box side
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-73
Step 5. Connector check: A-15X front-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the defective connector.
Step 6. Resistance measurement at A-15X
front-ECU connector.
(1) Disconnect the connector, and measure at the
relay box side.
(2) Resistance between A-15X front-ECU connector
terminal No.31 and body earth
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 7.
Step 7. Connector check: A-25 earth connector
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the defective connector.
AC311521AC
Connector: A-15X
Relay box side
21
22
23
24
25
26
27
28
29
30
31
AC311521AC
Connector: A-15X
Relay box side
21
22
23
24
25
26
27
28
29
30
31
AC310506BV
Connector A-15X
(Harness side)
21
22
23
24
25
26
27
28
29
30
31
AC310403
A-25 (GR)
AE
Connector: A-25 <LHD>
Harness side
AC310398
A-25 (GR)
AE
Connector: A-25 <RHD>
Harness side
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