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Mitsubishi 380. Manual - part 874

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-30

INSPECTION PROCEDURE 2: The Ignition Key cannot be Registered.

TECHNICAL DESCRIPTION (COMMENT)

The ignition key transponder or the ETACS-ECU is
suspected to be defective.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• Malfunction of the ignition key

• Malfunction of ETACS-ECU

Required Special Tools:

• MB991958: Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness A (Vehicles with CAN

communication system)

STEP 1. Using diagnostic tool MB991958, read the
diagnostic trouble code.

CAUTION

To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to "LOCK" (OFF) position before
connecting or disconnecting diagnostic tool.
Use diagnostic tool MB991958 to check if DTC 11 is set.
(1) Connect diagnostic tool MB991958 to the data link

connector.

(2) Turn the ignition switch "ON" position.
(3) Read the IMMOBILIZER system diagnostic trouble code.

Q: Does DTC11 reset?

YES : Refer to

P.54A-14

NO : Replace the ignition key that cannot be registered.

Then go to Step 2.

STEP 2. Retest the system.
Register the ignition key.

Q: Does registered ignition key function properly?

YES : The procedure is complete.
NO : Replace the ETACS-ECU.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-31

INSPECTION PROCEDURE 3: Engine Cranks, but does not Start.

TECHNICAL DESCRIPTION

If the engine cranks, but does not start, an MPI sys-
tem problem may exist in addition to a malfunctioning
IMMOBILIZER system. The engine will not start if the
ignition key has not been properly registered.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• Malfunction of MPI system

• Malfunction of ETACS-ECU system

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A (Vehicles with CAN

communication system)

STEP 1. Check the battery voltage.
Measure the battery voltage during cranking.

Q: Is the voltage 8 volts or more?

YES : Go to Step 2.
NO : Check the condition of the battery. Refer to

P.54A-5

STEP 2. Using diagnostic tool MB991958, read the
diagnostic trouble code.

CAUTION

To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to "LOCK" (OFF) position before
connecting or disconnecting diagnostic tool.
(1) Connect diagnostic tool MB991958 to the data link

connector.

(2) Turn the ignition switch "ON" position.
(3) Read the diagnosis code.

Q: Have any DTCs set?

Yes : Refer to

P.54A-13

No : Go to Step 3.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-32

STEP 3. Using diagnostic tool MB991958, read the MPI
system diagnostic trouble code.

CAUTION

connector.

(2) Turn the ignition switch "ON" position.
(3) Read the diagnosis code.

Q: Have any MPI system DTCs set?

Yes : Refer to GROUP 13A, MPI Diagnosis

− Diagnostic

Trouble Code Chart

P.13A-17

No : Go to Step 4.

STEP 4. Attempt to start the engine.

Q: Does the engine start?

YES : The procedure is complete (If no malfunctions are

found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points-How to
Cope with Intermittent Malfunction

P.00-14

NO : Refer to GROUP 13A, MPI Diagnosis

− Symptom

Chart

P.13A-21

. If the malfunction is not resolved,

replace the ETACS-ECU. Then register the password
(secret code) and encrypted code. (Refer to

P.54A-37

.) The engine should now start.

DATA LIST REFERENCE TABLE

M1543007300325

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MUT-III
DIAGNOSTIC TOOL
DISPLAY

ITEM
NO.

INSPECTION ITEM

INSPECTION
REQUIREMENT

NORMAL
CONDITION

REGD.KEY

Key has been registered -

Number of registered ignition
keys

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-33

CHECK AT ETACS- ECU

M1543007600508

Terminal Voltage Check

NOTE: *:The terminal No.1 to 20 connectors cannot
be measured as the ETACS-ECU is installed directly
on the junction block. Therefore, this information is
only for reference.

AC307447

54DB021A

C-218

C-219

C-217

49 50

52 53

57 58

TERMINAL
NO.

INSPECTION ITEM

INSPECTION CONDITION

NORMAL VALUE

Output to power window relay

When the power windows can
work

Battery positive voltage

Battery positive voltage (for
central door lock)

Always

Battery positive voltage

Ground (for ECU)

Always

0 V

Power supply to ignition switch
(ACC)

Ignition switch: "ACC"

Battery positive voltage

Output to dome light

When dome light is on

2 V or less

Power supply to interior light

Always (when interior light
shutoff function is not operating)

Battery positive voltage

Input from rear door switch (LH)

Rear door switch (LH): ON (rear
door (LH) open)

0 V

Power supply to ignition switch
(IG1)

Ignition switch: "ON"

Battery positive voltage

Output to turn-signal light (RH)

When turn-signal light (RH) is on Battery positive voltage

Input from driver’s door switch

Driver's door switch: ON (driver's
door open)

0 V

Battery power supply for
turn-signal light

Always

Battery positive voltage

Output to door lock

When door lock actuator is
operating (doors and fuel door
locked)

Battery positive voltage

Output to door unlock (excluding
driver's door)

When door lock actuator is
operating (doors and fuel door
unlocked)

Battery positive voltage

Output to turn-signal light (LH)

When turn-signal light (LH) is on Battery positive voltage

− 17

−

Power supply to ignition switch
(ACC)

Ignition switch: "ACC"

Battery positive voltage

−

Battery power supply (for ECU)

Always

Battery positive voltage

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