Mitsubishi Galant 9G. Manual — part 449

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-14

DIAGNOSTIC TROUBLE CODE CHART

M1172002200295

Check according to the inspection chart that is
appropriate for the diagnostic trouble code.

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC15 : Auto-cruise Control Switch System

DIAGNOSTIC TROUBLE
CODE NO.

INSPECTION ITEM

REFERENCE PAGE

15

Auto-cruise control switch system

P.17-14

21

Cancel latch signal system

P.17-32

22

Stoplight switch system

P.17-33

23

Powertrain control module (PCM) and its related
components

P.17-51

AC305709

AUTO-CRUISE
CONTROL
SWITCH

CLOCK
SPRING

POWERTRAIN CONTROL MODULE (PCM)

BLACK

BLACK-

WHITE

BLACK-

RED

BLACK-

RED

PINK-

BLACK

PINK-

BLACK

AB

Auto-cruise Control Switch System Circuit

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-15

.

CIRCUIT OPERATION

This circuit judges the signals of each switch
("COAST/SET", "ACC/RES" and "CANCEL") of the
auto-cruise control switch. The PCM 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

.

AC305710

B-20 HARNESS

CONNECTOR:

COMPONENT SIDE

B-19 HARNESS

CONNECTOR:

COMPONENT SIDE

AB

B-19 (B)

B-20

CONNECTORS: B-19, B-20

AIR CLEANER

PCM

AC305232

C-29

CONNECTOR: C-29

AC

C-29 MALE SIDE CONNECTOR

AC305236

C-306 HARNESS

CONNECTOR:

COMPONENT SIDE

C-303 HARNESS

CONNECTOR:

COMPONENT SIDE

C-302 HARNESS

CONNECTOR:

COMPONENT SIDE

AB

C-302 (Y)

C-303 (GR)

C-306

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

CLOCK

SPRING

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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DTC SET CONDITIONS

Check Condition

• The "CRUISE" indicator light illuminates.

Judgement Criteria

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

DTC will be set when the PCM 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 PCM.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991223: Harness Set

• MB991923: Power Plant ECU Check Harness

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-17

STEP 1. Using scan tool MB991958, check data list item 01:
Main Switch, list item 02: Set Switch, item 03: Resume
Switch and list item 04: Cancel Switch.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.

(Refer to

P.17-11

).

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

auto-cruise control system. (Refer to

P.17-11

).

• Item 01: Main Switch.

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

tion, the display on scan tool MB991958 should be
"ON".

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

position, the display on scan tool MB991958 should
be "OFF".

• Item 02: Set Switch.

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

the display on scan tool MB991958 should be "ON".

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

the display on scan tool MB991958 should be
"OFF".

• Item 03: Resume Switch.

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

display on scan tool MB991958 should be "ON".

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

the display on scan tool MB991958 should be
"OFF".

• Item 04: Cancel Switch.

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

display on scan tool MB991958 should be "ON".

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

the display on scan tool MB991958 should be
"OFF".

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is the switch operating properly?

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

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827