Mitsubishi Eclipse. Manual - part 821

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-293

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CIRCUIT OPERATION
If a fail-safe is triggered while driving forward, the 
PCM flashes the "N" range light once per second 
(triggered fail-safe). The PCM does this by switching 
battery positive voltage to terminal 121.

.

DTC SET CONDITIONS
If the PCM detects a fail-safe condition, it will attempt 
to illuminate the "N" range light. The PCM sends a 12 
volts pulse for 60 

− 180 ms. If it does not detect a 

voltage drop during the pulse, it waits about 60 sec-
onds and pulses 12 volts again for 60 

− 180 ms. If 

the PCM does no detect the voltage drop before the 
ignition switch is turned "LOCK" (OFF), the PCM will 
consider it as an short circuit of the "N" range light 
circuit and DTC 56 is set.

.

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

• Defective "N" range light bulb

• Damaged harness or connector

• Malfunction of the PCM

DIAGNOSIS

Required Special Tool:

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

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

AC001729AW

CONNECTOR: C-43

C-43

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>

AC001729AZ

CONNECTOR: C-78

C-78

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-294

STEP 1. Check the "N" range light bulb.
(1) Turn the ignition switch to the "ON" position.
(2) Move the selector lever to "N" position.

• The "N" range light in the combination meter illuminates.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the "N" range light illuminate?

YES : Go to Step 7.
NO :  Go to Step 2.

STEP 2. Check the "N" range light bulb.
(1) Remove the combination meter. Refer to GROUP 54A, 

Chassis Electrical 

− Combination Meter Assembly and 

Vehicle Speed Sensor 

P.54A-112

.

(2) Check the "N" range light bulb.
Q: Is the bulb in good condition?

YES : Go to Step 3.
NO :  Replace the "N" range light bulb.

STEP 3. Check combination meter connector C-43 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 4.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

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AC001729AW

CONNECTOR: C-43

C-43

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-295

STEP 4. Measure the resistance at combination meter 
connector C-43.
(1) Disconnect connector C-43 and measure at the harness 

side.

(2) Measure the resistance between terminal 12 and ground.

• The measured resistance should be less than 2 ohms.

Q: Is the measured resistance less than 2 ohms?

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

STEP 5. Check joint connector (2) connector C-78 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

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STEP 6. Check the harness for open circuit or damage 
between combination meter connector C-43 terminal 12 
and body ground.
Q: Is the harness wire in good condition?

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

AC001729AW

CONNECTOR: C-43

C-43

AC102538

11

1

2

3

12

4

5

6

7

8

9

10

13

14

15

16

C-43 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AC

AC001729AZ

CONNECTOR: C-78

C-78

AC001729AW

CONNECTOR: C-43

C-43

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-296

STEP 7. Check transmission range switch connector B-41, 
combination meter connector C-43, intermediate 
connector C-27 and PCM connector C-61 <2.4L Engine> or 
C-63 <3.0L Engine> 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 8.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

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AC001844

CONNECTOR: B-41

DIPSTICK

AK

B-41

AC001729AW

CONNECTOR: C-43

C-43

AC001741

CONNECTOR: C-27

AR

C-27

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>