Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 473

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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DTC 31: Low-Reverse Solenoid Valve System

AC004690AC

Solenoid Valve System Circuit

AC004306 AC

BATTERY

CONNECTOR: A-19X

ACX02479

CONNECTOR: B-40

AE

AUTOMATIC TRANSAXLE DIAGNOSIS

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CIRCUIT OPERATION

•

A/T control relay supplies battery positive voltage
to each solenoid valve (terminal 9 and 10).

•

Solenoid valve closes when energized (on), and
opens when deenergized (off). The PCM
energize or deenergize solenoid valve, based on
inputs data from sensors such as Throttle
Position Sensor, Park/Neutral Position Switch,
Stoplight Switch, Vehicle Speed Sensor, Input
Shaft Speed Sensor, Output Shaft Speed Sensor,
A/T Fluid Temperature Sensor etc.

•

The PCM provides the ground to energize
solenoid. The ground time is displayed in
percent.

•

As solenoid is energized or deenergized, it
influences hydraulic pressure in the transmission
applying and releasing elements.

DTC SET CONDITIONS
If the resistance value for a solenoid valve circuit is
greater than 3.5

Ω

for 4 seconds at 100

°

C (212

°

F) or

less than 2.6

Ω

for 4 seconds at 100

°

C (212

°

F), it is

judged that there is a short circuit or an open circuit
in the solenoid valve and the diagnostic trouble code
number "31" is displayed. The transmission is locked
into 3rd gear as a fail-safe measure, and the "N"
range light flashes once per second.

TROUBLESHOOTING HINTS (The most likely

causes for this code to be set:)

•

Malfunction of low-reverse solenoid valve

•

Damaged harness, connector

•

Malfunction of the PCM

DIAGNOSIS

Required Special Tool:
MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, read the A/T
diagnostic trouble code.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Read the A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the A/T diagnostic trouble code number "54" output?

YES : Refer to

P.23A-237

, code number 54: A/T control

relay system.

NO : Go to Step 2.

AC002219

CONNECTORS: B-40-1, B-40-2, B-40-3,

B-40-4, B-40-5

AF

B-40-1

B-40-2

B-40-4

B-40-3

B-40-5

VALVE BODY
ASSEMBLY

AC001657

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

PCM

AN

AC001252

MB991502

16 PIN

AB

AUTOMATIC TRANSAXLE DIAGNOSIS

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STEP 2. Using scan tool MB991502, check actuator test
item 01: Low-Reverse Solenoid Valve.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Set scan tool MB991502 to actuator test mode for item 01:

Low-Reverse Solenoid Valve.

•

An operation sound should be heard from solenoid
valve when the low-reverse solenoid valve is operated.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the solenoid valve operating properly?

YES : This malfunction can be intermittent. Refer to GROUP

00, How to Use Troubleshooting/Inspection Service
Points

−

How to Cope with Intermittent Malfunction

P.00-6

.

NO : Go to Step 3.

STEP 3. Check the solenoid valve output voltage at PCM
connector C-61 <2.4L Engine> or C-63 <3.0L Engine> by
backprobing.
(1) Do not disconnect connector C-61 <2.4L Engine> or C-63

<3.0L Engine>.

(2) Turn the ignition switch to "ON" position.

(3) Measure the voltage between terminal 129 and ground by

backprobing.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 4.
NO : Go to Step 9.

AC001252

MB991502

16 PIN

AB

AC001657

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

PCM

AN

AC001959

C-61 <2.4L ENGINE> OR
C-63 <3.0L ENGINE>
CONNECTOR HARNESS
SIDE VIEW

AD

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STEP 4. Check connectors B-40 at solenoid valve
assembly and C-61 <2.4L Engine> or C-63 <3.0L Engine> at
PCM for damage.
Q: Are the connectors in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

STEP 5. Check harness for damage between solenoid
valve assembly connector B-40 terminal 6 and PCM
connector C-61 <2.4L Engine> or C-63 <3.0L Engine>
terminal 129.
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO : Repair it.

ACX02479

CONNECTOR: B-40

AE

AC001657

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

PCM

AN

ACX02479

CONNECTOR: B-40

AE

AC001657

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

PCM

AN