Mitsubishi Eclipse. Manual — part 688

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-33

DTC 15 : Auto-cruise Control Switch System

.

AC106581

Auto-cruise Control Switch System Circuit

AB

AC001451

CONNECTOR: C-20

AB

AC106551AB

CONNECTORS: C-82, C-84, C-96

C-96

C-84

C-82

CLOCK SPRING

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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CIRCUIT OPERATION
This circuit judges the signals of each switch ("OFF,"
"SET," "RESUME," "CANCEL" and "MAIN") of the
auto-cruise control switch. The auto-cruise con-
trol-ECU detects the state of the auto-cruise control
switch by sensing the voltages shown below.

• When all switches are OFF, the ECU detects 3.5

− 5.0 volts.

• When the "SET" switch is ON, the ECU detects

0.4

− 2.3 volts.

• When the "RESUME" switch is ON, the ECU

detects 2.3

− 3.5 volts.

• When the "CANCEL" switch is ON, the ECU

detects 0.4 volts or less.

• When the main switch is ON, the ECU detects 7.0

volts.

.

DTC SET CONDITIONS
This code is output when the auto-cruise control
switch "RESUME" switch, "SET" switch or "CAN-
CEL" switch stays ON.

.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:

• Malfunction of the auto-cruise control switch.

• Malfunction of the clock spring.

• Damaged harness or connector.

• Malfunction of the auto-cruise control-ECU.

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check the 12-Volt supply circuit voltage at
auto-cruise control switch connector C-82 (terminal
number 1).
(1) Disconnect auto-cruise control switch connector C-82 and

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage approximately battery positive voltage?

YES : Go to Step 6.
NO : Go to Step 2.

STEP 2. Check auto-cruise control switch connector C-82.
Q: Is the connector damaged?

YES : Repair or replace connector. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. Then check

that diagnostic trouble code 15 is not output.

NO : Go to Step 3.

1

2

3

ACX02255AE

AUTO-CRUISE
CONTROL SWITCH
CONNECTOR: C-82

AC106551AC

CONNECTORS: C-82

CLOCK SPRING

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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STEP 3. Check the clock spring.
Refer to GROUP 52B, Air Bag Modules and Clock Spring

P.52B-146

.

Q: Is the clock spring damaged?

YES : Replace the clock spring. Refer to GROUP 52B, Air

Bag Modules and Clock Spring

P.52B-146

. Then

check that diagnostic trouble code 15 is not output.

NO : Go to Step 4.

STEP 4. Check clock spring connector C-84.
Q: Is any connector damaged?

YES : Repair or replace connector. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. Then check

that diagnostic trouble code 15 is not output.

NO : Go to Step 5.

STEP 5. Check clock spring connector C-96.
Q: Is any connector damaged?

YES : Repair or replace connector. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. Then check

that diagnostic trouble code 15 is not output.

NO : Check the harness wire between multi-purpose fuse

No.21 and auto-cruise control switch connector C-82
for open circuit or damage. Then repair if necessary.
Then check that diagnostic trouble code 15 is not
output.

AC106551AD

CONNECTORS: C-84

CLOCK SPRING

AC106551AE

CONNECTORS: C-96

CLOCK SPRING

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-36

STEP 6. Check the output circuit voltage at auto-cruise
control switch connector C-82 (terminal numbers 2 and 3)
by backprobing.
(1) Do not disconnect auto-cruise control switch connector

C-207.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2 and ground by

backprobing.

• Voltage should be battery positive voltage. (MAIN switch

is at the "ON" position.)

(4) Measure the voltage between terminal 3 and ground by

backprobing.

• Voltage should be between 6.8 and 7.2 volts. (MAIN

switch is at the "ON" position.)

• Voltage should be between 3.5 and 5.0 volts. (All

switches are at the "OFF" position.)

• Voltage should be between 0.4 and 2.3 volts. ("SET"

switch is at the "ON" position)

• Voltage should be between 2.3 and 3.5 volts.

("RESUME" switch is at the "ON" position.)

• Voltage should be between 1 volt or less. ("CANCEL"

switch is at the "ON" position.)

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage within specifications?

YES : Go to Step 9.
NO : Go to Step 7.

STEP 7. Check auto-cruise control switch connector C-82.
Q: Is the connector damaged?

YES : Repair or replace connector. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. Then check

that diagnostic trouble code 15 is not output.

NO : Go to Step 8.

1 2

3

ACX01913 AE

C-82 CONNECTOR
HARNESS SIDE VIEW

AC106551AC

CONNECTORS: C-82

CLOCK SPRING