Mitsubishi Eclipse. Manual - part 785

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-149

STEP 4. Measure the stoplight switch power supply 
voltage at connector C-03 by backprobing.
(1) Remove the stoplight switch from the mounting bracket.
(2) Do not disconnect connector C-03.

(3) Measure the voltage between terminal 2 and ground by 

backprobing.

• The voltage should measure battery positive voltage.

Q: Is the measured voltage battery positive voltage?

YES : Go to Step 7.
NO :   Go to step 5.

STEP 5. Check stoplight switch connector C-03 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Are the connector and terminals in good condition?

YES : Go to Step 6.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

STEP 6. Check the harness for damage between stoplight 
switch connector C-03 terminal 2 and the power supply 
fuse.
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair or replace the harness wire.

AC001729

C-03

CONNECTOR: C-03

AV

2

1

3

4

AC201487AC

C-03 HARNESS 
CONNECTOR:
HARNESS SIDE

AC001729

C-03

CONNECTOR: C-03

AV

AC001729

C-03

CONNECTOR: C-03

AV

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-150

STEP 7. Measure the stoplight switch output voltage to the 
PCM at connector C-03 by backprobing.
(1) Remove the stoplight switch from the mounting bracket.
(2) Do not disconnect connector C-03.

(3) Measure the voltage between terminal 1 and ground by 

backprobing.

• When the switch button is out (closed circuit), voltage 

should equal battery positive voltage.

• When the switch button is depressed (open circuit), volt-

age should measure less than 1.0 volt.

Q: Is the measured voltage battery positive voltage with 

the switch button released (closed circuit), and less 
than 1.0 volt with the switch button depressed (open 
circuit)?
YES : Go to Step 9.
NO :  Go to Step 8.

STEP 8. Check the stoplight switch.
Refer to GROUP 35A, On-vehicle Service 

− Stoplight Switch 

Check 

P.35A-18

.

Q: Does the stoplight switch pass the checks?

YES : Go to Step 9.
NO :  Replace the stoplight switch. Refer to GROUP 35A, 

Brake Pedal 

P.35A-31

.

AC001729

C-03

CONNECTOR: C-03

AV

3

2

1

4

AC201041AC

C-03 HARNESS 
CONNECTOR:
HARNESS SIDE

ACX02208

BRAKE PEDAL

STOPLIGHT
SWITCH

AD

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-151

STEP 9. Measure the stoplight switch output voltage at the 
PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> 
by backprobing.
(1) Install the stoplight switch into the mounting bracket if it was 

removed.

(2) Do not disconnect connector C-61 <2.4L Engine> or C-63 

<3.0L Engine>.

(3) Measure the voltage between terminal 123 and ground by 

backprobing.

• When the brake pedal is depressed, voltage should 

measure battery positive voltage.

• When the brake pedal is not depressed, voltage should 

measure less than 1.0 volt.

Q: Is the measured voltage battery positive voltage with 

the brake pedal depressed (closed circuit), and less 
than 1.0 volt with the brake pedal released (open 
circuit)?
YES : Go to Step 12.
NO :  Go to Step 10.

AC001657

CONNECTOR: C-61 <2.4L ENGINE> OR
C-63 <3.0L ENGINE>

PCM

BC

C-61 <2.4L ENGINE> OR C-63 <3.0L ENGINE>

AC001812AN

C-61 <2.4L ENGINE> OR
C-63 <3.0L ENGINE>

HARNESS CONNECTOR:
HARNESS SIDE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-152

STEP 10. Check PCM connector C-61 <2.4L Engine> or 
C-63 <3.0L Engine>, intermediate connector C-28 and C-89 
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 11.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC001657

CONNECTOR: C-61 <2.4L ENGINE> OR
C-63 <3.0L ENGINE>

PCM

BC

C-61 <2.4L ENGINE> OR C-63 <3.0L ENGINE>

AC106611AB

CONNECTOR: C-28

C-28