Mitsubishi Lancer Evolution IX. Manual — part 605
TROUBLESHOOTING <ACD>
MANUAL TRANSMISSION (FF)
22A-103
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the defective connector.
STEP 8. Check the harness between ABS-ECU
connector B-118 terminal No.3 and 4WD-ECU
connector C-26 terminal No.48.
Check the output line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the wiring harness.
AC311020
Harness side
B-118
(B)
AB
Connector: B-118
<LH drive vehicles>
<RH drive vehicles>
B-118
(GR)
B-118
AC311002
4WD-ECU
Harness side
C-26 (Y)
AC
Connector: C-26
4WD-ECU
C-26 (Y)
Rear console
assembly
<LH drive vehicles>
<RH drive vehicles>
TROUBLESHOOTING <ACD>
MANUAL TRANSMISSION (FF)
22A-104
STEP 9. Measure the voltage at ABS-ECU
connector B-118.
(1) Turn the ignition switch to the ON position.
(2) Execute ABS actuator test (item 05: ABS signal).
(3) Measure the voltage between ABS-ECU
connector B-118 terminal No.3 and earth.
OK: The voltage remains 1 V or less dur-
ing the actuator test (for 10 seconds) and
becomes system voltage.
Q: Is the check result normal?
YES :
Replace the 4WD-ECU.
NO :
Replace the ABS-ECU.
AC311020
Harness side
B-118
(B)
AB
Connector: B-118
<LH drive vehicles>
<RH drive vehicles>
B-118
(GR)
B-118
TROUBLESHOOTING <ACD>
MANUAL TRANSMISSION (FF)
22A-105
Code No.74 Proportional valve system <ACD>
OPERATION
The proportional valve (ACD) controls the hydraulic
pressure to activate the ACD hydraulic multi plate
clutch according to signal from the 4WD-ECU.
DIAGNOSIS CODE SET CONDITIONS
Code No.74 is set when open circuit or short circuit
of the control circuit of the proportional valve has
occurred.
PROBABLE CAUSES
• Malfunction of proportional valve
• Damaged harness wires and connectors
• Malfunction of the 4WD-ECU
DIAGNOSIS
STEP 1. M.U.T.-II/III data list
Item 11: Proportional valve current <ACD> (Refer to
data list reference table
).
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
).
NO :
Go to Step 2.
PROPORTIONING VALVE
(FOR ACD CONTROL)
<LH DRIVE VEHICLES> OR
<RH DRIVE VEHICLES>
4WD-ECU
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
Proportioning valve <ACD> system circuit
TROUBLESHOOTING <ACD>
MANUAL TRANSMISSION (FF)
22A-106
STEP 2. Measure the resistance at proportional
valve connector F-24.
Disconnect the proportional valve connector, and
measure the resistance between terminal No.2 and
No.3.
OK: 4.7
Ω or less
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the hydraulic unit.
STEP 3. Measure the resistance at proportional
valve connector F-24.
Disconnect the proportional valve connector, and
measure the resistance between terminal No.2 and
earth.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 4.
STEP 4. Connectors check: F-21 intermediate
connector, F-24 proportional valve connector.
Check for the contact with terminals.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the defective connector.
STEP 5. Check the harness between proportional
valve connector F-24 terminal No.2 and earth.
Check the earth line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
STEP 6. M.U.T.-II/III data list
Item 11: Proportional valve current <ACD> (Refer to
data list reference table
).
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Cope with Intermittent
).
NO :
Replace the 4WD-ECU.
AC311042
AD
Connector: F-24
F-24 (B)
Valve side
F-24
AC311042
AD
Connector: F-24
F-24 (B)
Valve side
F-24
AC311042
F-21 (B)
AE
Connector: F-21, F-24
F-24 (B)
F-21
Valve side
F-24
AC311042
AD
Connector: F-24
F-24 (B)
Valve side
F-24
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