Mitsubishi Colt Ralliart. Manual — part 468
IGNITION SWITCH
CHASSIS ELECTRICAL
54A-17
Step 2. Connector check: Immobiliser-ECU
connector B-49 and engine-ECU <M/T> or
engine-CVT-ECU <CVT> connector A-08
AC509191
Connector: A-08
Harness side
AD
A-08 (GR)
AC509573
Connector: B-49
Harness side
AB
Q: Are immobiliser-ECU connector B-49 and
engine-ECU <M/T> or engine-CVT-ECU <CVT>
connector A-08 in good condition?
YES :
Go to Step 3.
NO :
Repair the defective connector.
Step 3. Check the harness wires between
immobiliser-ECU connector B-49 (terminal 3) and
engine-ECU <M/T> or engine-CVT-ECU <CVT>
connector A-08 (terminal 120).
AC509191
Connector: A-08
Harness side
AD
A-08 (GR)
AC509573
Connector: B-49
Harness side
AB
NOTE:
AC401053
AH
Connector: B-40
Prior to the wiring harness inspection, check interme-
diate connector B-40, and repair if necessary.
Q: Are the harness wires between immobiliser-ECU
connector B-49 (terminal 3) and engine-ECU <M/T>
or engine-CVT-ECU <CVT> connector A-08
(terminal 120) in good condition?
YES :
Go to Step 4.
NO :
Repair the wiring harness.
Main
Index
Group
TOC
IGNITION SWITCH
CHASSIS ELECTRICAL
54A-18
Step 4. Check the communication with M.U.T.-III
Q: Can the system communicate with the M.U.T.-III?
YES :
Go to Step 5.
NO :
Refer to INSPECTION PROCEDURE 1
"MPI system-related diagnostic code
No.P0513 is set, and communication
between M.U.T.-III and immobiliser cannot
be established
Step 5. M.U.T.-III diagnosis code
Check whether the engine immobilizer sys-
tem-related diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Refer to
.
NO :
Go to Step 6.
Step 6. Retest the system.
Check that the ignition key can be registered.
Q: Is the check result normal?
YES :
The procedure is complete.
NO :
Replace the immobilizer ECU, and then go
to Step 7 .
Step 7. Retest the system.
Check that the ignition key can be registered.
Q: Is the check result normal?
YES :
The procedure is complete.
NO :
Replace the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
Inspection procedure: 3 The Engine does not Start. (Cranking Occurs but Initial Combustion does
not)
COMMENTS ON TROUBLE SYMPTOM
If the fuel injection does not work, the immobi-
liser-ECU and the MPI system may be defective. It is
no problem with the malfunction above when the
engine is started with unregistered ignition key.
POSSIBLE CAUSES
• Malfunction of MPI system
• Malfunction of immobiliser-ECU
DIAGNOSIS PROCEDURE
Step 1. Battery voltage check
Measure the battery voltage when cranking.
OK: 8 V or more
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Check the battery. Refer to
.
Step 2. M.U.T.-III other system diagnosis code
Check whether the MPI system-related diagnosis
code is set.
Q: Is the diagnosis code set?
YES :
Refer to GROUP 13A, Troubleshooting
.
NO :
Go to Step 3.
Step 3. M.U.T.-III diagnosis code
Check whether the engine immobiliser sys-
tem-related diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Refer to
.
NO :
Go to Step 4.
Step 4. Check that the engine starts.
Q: Does the engine start?
YES :
The procedure is complete.
NO :
Refer to GROUP 13A, Troubleshooting
. Replace the immobiliser-ECU
when the cause of the failure cannot tracked
down by performing the troubleshooting.
Main
Index
Group
TOC
IGNITION SWITCH
CHASSIS ELECTRICAL
54A-19
Inspection procedure: 4 Check the Power Supply and Earth Circuit to the Immobiliser-ECU.
AC601476 AB
Immobilizer-ECU Power Source, Earth and Engine-ECU <M/T> or Engine-CVT-ECU <CVT>
Communication Line Circuit
IMMOBILIZER-
ECU
POWER
SOURCE
ENGINE
CONTROL
RELAY
ENGINE-ECU <M/T>
ENGINE-CVT-ECU <CVT>
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
CIRCUIT OPERATION
Refer to
.
COMMENTS ON TROUBLE SYMPTOM
The power supply and earth circuit to the immobi-
liser-ECU may be defective.
POSSIBLE CAUSES
• Damaged harness wires and connectors
DIAGNOSTIC PROCEDURE
Step 1. Connector check: Immobiliser-ECU
connector B-49
AC509573
Connector: B-49
Harness side
AB
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector.
Main
Index
Group
TOC
IGNITION SWITCH
CHASSIS ELECTRICAL
54A-20
Step 2. Voltage measurement at immobiliser-ECU
connector B-49 in order to check the battery
circuit of power supply system to the key
reminder switch.
AC509573
Connector: B-49
Harness side
AB
(1) Disconnect the immobiliser-ECU connector B-49
and measure the voltage at immobiliser-ECU
connector B-49 harness side.
(2) Turn the ignition switch to “ON” position.
AC400965AN
Connector: B-49
(Harness side)
(3) Measure the voltage between terminal 1 and
earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 3.
Step 3. Connector check: Engine control relay
connector B-106
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the defective connector.
Step 4. Check the wiring harness between engine
control relay connector B-106 (terminal 4) and
immobiliser-ECU connector B-49 (terminal 1).
•
AC509573
Connector: B-49
Harness side
AB
AC313870
Connector: B-106
Junction block (Front view)
BF
Harness side
Check the power supply line for open circuit.
NOTE:
AC401053
AH
Connector: B-40
Prior to the wiring harness inspection, check junction
block connector B-131, and repair if necessary.
Q: Are the wiring harness between engine control
relay connector B-106 (terminal 4) and
immobiliser-ECU connector B-49 (terminal 1) in
good condition?
YES :
Go to Step 5.
NO :
Repair the wiring harness.
Main
Index
Group
TOC
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