Mitsubishi 380. Manual — part 898

COMBINATION METER ASSEMBLY

CHASSIS ELECTRICAL

54A-126

STEP 12. Retest the system.
Check that the speedometer works normally.

Q: Is the check result satisfactory?

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 : Go to step 1.

COMBINATION METER ASSEMBLY

CHASSIS ELECTRICAL

54A-127

INSPECTION PROCEDURE 15: Speed alarm warning "Beeps" do not trigger when set speed is
exceeded.

NOTE: This troubleshooting procedure requires the
use of diagnostic tool MB991958 and SWS monitor
kit MB991813. For details on how to use the SWS
monitor, refer to "How to connect SWS monitor

P.54B-13

."

.

CIRCUIT OPERATION

The ETACS-ECU controls the speed alarm warning
tone alarm, based on the signals from the switches
and sensors below.

• Ignition switch (IG1): ON

• Vehicle speed signal exceeding set speed

.

TECHNICAL DESCRIPTION (COMMENT)

If the speed alarm warning tone alarm does not
work, connector(s), wiring harness in the CAN bus
lines, the combination meter, the ETACS-ECU or the
input signal circuit may be defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• Trouble in input signal system (vehicle speed

sensor)

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The combination meter may be defective

• The Engine-ECU, A/T-ECU or ETACS-ECU may

be defective

ETACS-

ECU

VEHICLES SPEED

SIGNAL

· IGNITION SWITCH (IG1)

COMBINATION

METER

CPU

CAN COMMUNICATION LINE

(CAN_L LINE)

CAN COMMUNICATION LINE

(CAN_H LINE)

Speed Alarm Function Circuit

16DB584A

COMBINATION METER ASSEMBLY

CHASSIS ELECTRICAL

54A-128

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

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Test Probe Harness

STEP 1. Using diagnostic tool MB991958, diagnose the
CAN bus line.

CAUTION

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

connect SWS monitor

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-5

).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

COMBINATION METER ASSEMBLY

CHASSIS ELECTRICAL

54A-129

STEP 2. Using diagnostic tool MB991958, read the
combination meter diagnostic trouble code.
Check whether the combination meter-related DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether the combination meter-related DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the combination meter (Refer to GROUP

54A, Diagnostic trouble code chart

P.54A-48

).

NO : Go to Step 3.

STEP 3. Using diagnostic tool MB991958, read A/T
diagnostic trouble code.
Check if an A/T system or Engine (MPI) system DTC is set.

Q: Is the DTC set?

YES : Refer to GROUP 23A, Automatic Transmission

Diagnosis

− Diagnostic Trouble Code Chart

P.23A-34

, or GROUP 13A Engine (MPI)

− Diagnostic

Trouble Code Chart

P.13A-17

, or refer to Output

speed sensor system

P.23A-72

. On completion, go to

Step 4.

NO : Go to Step 4.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827