Mitsubishi 380. Manual — part 338

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-20

DTC1564 : Auto-cruise Control Switch System

.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

17DB041A

C-29

CONNECTOR: C-29

C-29 MALE SIDE CONNECTOR

17DB040A

C-306 HARNESS

CONNECTOR:

COMPONENT SIDE

C-303 HARNESS

CONNECTOR:

COMPONENT SIDE

C-302 HARNESS

CONNECTOR:

COMPONENT SIDE

C-302 (Y)

C-303 (GR)

C-306

CONNECTORS: C-302, C-303, C-306

CLOCK

SPRING

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-21

CIRCUIT OPERATION

This circuit judges the signals of each switch
("COAST/SET", "ACC/RES" and "CANCEL") of the
auto-cruise control switch. The Engine ECU detects
the state of the auto-cruise control switch by sensing
the voltages shown below.

• When all switches are OFF: 4.7 − 5.0 volts

• When the "CRUISE" (MAIN) switch is "ON": 0 −

0.3 volt

• When the "COAST/SET" switch is ON: 2.0 − 2.8

volts

• When the "ACC/RES" switch is ON: 3.3 − 4.1

volts

• When the "CANCEL" switch is ON: 0.8 − 1.5 volts

.

DTC SET CONDITIONS

Check Condition

• The "CRUISE" indicator lamp illuminates.

Judgement Criteria

• If the auto-cruise control switch is operated, this

DTC will be set when the Engine ECU terminal
voltage is different from the standard value.

.

TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of the auto-cruise control switch.

• Malfunction of the clock spring.

• Damaged harness or connector.

• Malfunction of the Engine ECU.

Circuit drawings

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• Refer to component locations GROUP-

70

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991223: Harness Set
• MB992044: ENGINE-ECU Check Harness

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-22

STEP 1. Using Diagnostic Tool MB991958, check data list
item 86: Main Switch, list item 92: Set Switch, item 91:
Resume Switch and list item 75: Cancel Switch.

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 to the data link

connector. (Refer to

P.17-11

).

(2) Turn the ignition switch to the "ON" position.
(3) Set Diagnostic Tool MB991958 to data reading mode for

auto-cruise control system. (Refer to

P.17-11

).

• Item 86: Main Switch.

• When "CRUISE" (MAIN) switch is at the "ON" posi-

tion, the display on Diagnostic Tool MB991958
should be "ON".

• When ""CRUISE" (MAIN) switch is at the "OFF"

position, the display on Diagnostic Tool MB991958
should be "OFF".

• Item 92: Set Switch.

• When "COAST/SET" switch is at the "ON" position,

the display on Diagnostic Tool MB991958 should be
"ON".

• When "COAST/SET" switch is at the "OFF" position,

the display on Diagnostic Tool MB991958 should be
"OFF".

• Item 91: Resume Switch.

• When "ACC/RES" switch is at the "ON" position, the

display on Diagnostic Tool MB991958 should be
"ON".

• When "ACC/RES" switch is at the "OFF" position,

the display on Diagnostic Tool MB991958 should be
"OFF".

• Item 75: Cancel Switch.

• When "CANCEL" switch is at the "ON" position, the

display on Diagnostic Tool MB991958 should be
"ON".

• When "ACC/RES" switch is at the "OFF" position,

the display on Diagnostic Tool MB991958 should be
"OFF".

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 17.
NO : Go to Step 2.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-23

STEP 2. Measure the power supply voltage at auto-cruise
control switch connector C-302 by backprobing.
(1) Remove the air bag module (driver’s side). (Refer to

GROUP 52B, Air Bag Modules and Clock Spring

P.52B-237

).

(2) Connect the negative (

−) battery cable.

(3) Do not disconnect auto-cruise control switch connector

C-302.

(4) Turn the ignition switch to the "ON" position.
(5) The "CRUISE" (MAIN) switch to the "OFF" position.

(6) Measure the power supply voltage between auto-cruise

control switch connector C-302 terminal 2 and ground by
backprobing.

(7) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the measured voltage between 4.7 and 5.0 volts?

YES : Go to Step 9.
NO : Go to Step 3.

STEP 3. Measure the power supply voltage at Engine ECU
connector B-21.
(1) Disconnect all the connectors from the Engine ECU.
(2) Connect special tool MB992044 between the Engine ECU

and the body-side harness connector.

(3) Turn the ignition switch to the "ON" position.
(4) The "CRUISE" (MAIN) switch to the "OFF" position.
(5) Measure the power supply voltage between special tool

94-pin connector terminal 14 (Engine ECU connector B-21
terminal 14) and ground.

(6) Turn the ignition switch to the "LOCK" (OFF) position.
(7) Disconnect special tool MB992044 between the Engine

ECU and the body-side harness connector.

(8) Reconnect all the connectors to the Engine ECU.

Q: Is the measured voltage between 4.7 and 5.0 volts?

YES : Go to Step 6.
NO : Go to Step 4.

17DB042A

C-302 (Y)

CONNECTOR: C-302

C-302 HARNESS

CONNECTOR:

COMPONENT SIDE

CLOCK

SPRING

1 2 3

AC205053 AC

C-302 HARNESS
CONNECTOR:
HARNESS SIDE

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER