Mitsubishi Evolution X. Manual — part 1021
MMCS
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CHASSIS ELECTRICAL
54A-445
Inspection Procedure 12: Check the CAN box unit power supply circuit.
CAUTION
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communi-
cation circuit are normal. (Check that the voltage is 10 V or more.)
CAN Box Unit Power Supply Circuit
ACC
RELAY 2
ETACS-
ECU
FUSIBLE
LINK
36
FUSIBLE
LINK
37
CAN BOX UNIT
RELAY BOX
ENGINE
COMPARTMENT
MMCS
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CHASSIS ELECTRICAL
54A-446
.
TECHNICAL DESCRIPTION (COMMENT)
If the CAN box unit functions do not work at all, the
CAN box unit power supply system, ground system,
or CAN box unit may have a problem.
.
PROBABLE CAUSES
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
• The CAN box unit may be defective
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. Check CAN box unit connectors C-15 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is CAN box unit connectors C-15 in good condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
AC708951BP
Connectors: C-15, C-108
C-15
C-108
AC708950
Connector: C-105
BL
AC708972BC
Connectors: C-307, C-315, C-317
ETACS-ECU
C-307 (B)
C-315
C-317
MMCS
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CHASSIS ELECTRICAL
54A-447
STEP 2. Check the ground circuit to the CAN box unit.
Measure the resistance at CAN box unit connector C-15.
(1) Disconnect CAN box unit connector C-15 and measure the
resistance available at the wiring harness side of the
connector.
(2) Measure the resistance value between CAN box unit
connector C-15 terminal 1 and ground.
OK: The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 4.
NO : Go to Step 3.
STEP 3. Check the wiring harness between CAN box unit
connector C-15 (terminal 1) and the ground.
• Check the ground wires for open circuit.
NOTE: Also check intermediate connector C-108 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-108 is damaged, repair
or replace the connector as described in GROUP 00E, Harness
Connector Inspection
.
Q: Is the wiring harness between CAN box unit connector
C-15 (terminal 1) and the ground in good condition?
YES : Go to Step 4.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.
STEP 4. Check the battery power supply circuit to the CAN
box unit. Measure the voltage at CAN box unit connectors
C-15.
(1) Disconnect CAN box unit connectors C-15 measure the
voltage available at the wiring harness side of the
connector.
(2) Measure the voltage between CAN box unit connector C-15
terminal 2 and ground.
OK:Battery voltage.
Q: Is the measured voltage battery voltage?
YES : Go to Step 6.
NO : Go to Step 5.
AC709322 BH
Harness side: C-15
AC709325 AN
Harness side: C-15
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CHASSIS ELECTRICAL
54A-448
STEP 5. Check the wiring harness between CAN box unit
connector C-15 (terminal 2) and fusible link (36).
• Check the power supply line for open circuit and short cir-
cuit.
NOTE: Also check intermediate connector C-105 and
ETACS-ECU connectors C-307 and C-317 for loose, corroded,
or damaged terminals, or terminals pushed back in the connec-
tor. If intermediate connector C-108 or ETACS-ECU connector
C-307 or C-317 is damaged, repair or replace the connector as
described in GROUP 00E, Harness Connector Inspection
Q: Is the wiring harness between CAN box unit connector
C-15 (terminal 2) and fusible link (36) in good condition?
YES : Go to Step 6.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the CAN box unit normally.
STEP 6. Using scan tool MB991958, check data list.
Check the input signal of ACC relay.
• Turn the ignition switch to the ACC position.
OK: Normal condition is displayed.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Refer to GROUP 54A, ETACS, Diagnosis
− Inspection
Procedure 1 "The ignition switch (ACC) signal is not
received
."
STEP 7. Check ETACS-ECU connector C-315 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-315 in good condition?
YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
Item No.
Item name
Normal
conditions
Item 288
ACC switch
ON
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