Mitsubishi Eclipse. Manual - part 690

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-41

.

CIRCUIT OPERATION
The throttle position sensor signal and idle position 
signal are sent to the auto-cruise control-ECU 
through this circuit.
The throttle position sensor sends a voltage signal to 
terminal 1 of the auto-cruise control-ECU. The volt-
age depends on throttle opening angle.
The auto-cruise control-ECU receives an idle posi-
tion signal from the ECM <M/T> or PCM <A/T> at 
terminal 2. The signal is OFF when the accelerator 
pedal is depressed, and ON when the accelerator 
pedal is released.

.

DTC SET CONDITIONS

• The Idle position signal is ON and the throttle 

position sensor voltage is 2.5 volts or more for 
four seconds or more.

• The Idle position signal is OFF and the throttle 

position sensor voltage is 0.2 volt or less for four 
seconds or more.

.

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

• Malfunction of the throttle position sensor.

• Damaged harness or connector.

• Malfunction of the auto-cruise control-ECU.

• Malfunction of the ECM <M/T> or PCM <A/T>.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III sub assembly)

• MB991824: Vehicle Communication Interface

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

• MB991223: Harness Set

AC001451

CONNECTOR: C-20

AB

AC101201AB

CONNECTOR: C-28

AC203582AJ

CONNECTORS: C-60<2.4L ENGINE-M/T>, 
C-57<2.4L ENGINE-A/T>, C-62
<3.0L ENGINE-M/T>, C-59<3.0L ENGINE-A/T>

ECM <M/T>
OR
PCM <A/T>

C-60 (G), 
C-58 (GR)

C-57 (GR), 
C-59 (GR)

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-42

STEP 1. Check the throttle position sensor.

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) Using scan tool MB991958.
(2) Connect scan tool MB991958 to the data link connector.
(3)  Turn the ignition switch to the "ON" position.
(4) Read the MFI-DTC.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the MFI-DTC P0120 is output?

YES : For 2.4L engine, refer to GROUP 13A, Diagnosis 

− 

Diagnostic Trouble Code Chart 

P.13A-24

. For 3.0L 

engine, refer to GROUP 13B, Diagnosis 

− Diagnostic 

Trouble Code Chart 

P.13B-23

.

NO :  Go to Step 2.

STEP 2. Measure the signal voltage at auto-cruise 
control-ECU connector C-20 by backprobing.
(1) Do not disconnect auto-cruise control-ECU connector C-20.
(2) Turn the ignition switch to the "ON" position and the 

auto-cruise control MAIN switch to the "ON" position.

(3) Measure the voltage between auto-cruise control-ECU 

connector C-20 terminal 1 and ground by backprobing.

• The voltage should measure between 4.0 and 5.5 volts. 

(When accelerator pedal is fully depressed.)

• The voltage should measure between 0.4 and 1.0 volts. 

(When accelerator pedal is released.)

(4) Turn the auto-cruise control MAIN switch to the "OFF" 

position and the ignition switch to the "LOCK" (OFF) 
position.

Q: Are all of the measured voltages satisfied?

YES : Go to Step 5.
NO :  Go to Step 3.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824 

AC001451

CONNECTOR: C-20

AB

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

AC103150

C-20 CONNECTOR
HARNESS SIDE VIEW

AB

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-43

STEP 3. Check auto-cruise control-ECU connector C-20 
and intermediate connector C-28 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 4.
NO :  Repair or replace the faulty connector. (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

). Go to Step 9.

AC001451

CONNECTOR: C-20

AB

AC101201AB

CONNECTOR: C-28

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-44

STEP 4. Check the harness wire between throttle position 
sensor connector B-07 terminal 3 and auto-cruise 
control-ECU connector C-20 terminal 1 for damage.
Q: Is the harness wire in good condition?

YES : It can be assumed that this malfunction is intermittent. 

(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-6

). Go to 

Step 9.

NO :  Repair the damaged harness wire. Go to Step 9.

AC103106AB

CONNECTOR: B-07 <2.4L ENGINE>

AC103107

CONNECTOR: B-07 <3.0L ENGINE>

AC

AC001451

CONNECTOR: C-20

AB