Mitsubishi Eclipse. Manual — part 800

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-209

DTC 31 (P0753): Low-Reverse Solenoid Valve System

AC106635AB

Solenoid Valve System Circuit

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-210

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CIRCUIT OPERATION

• The A/T control relay supplies battery positive

voltage to the solenoid valve assembly (terminals
9 and 10).

• The solenoid valve closes when energized (on),

and opens when not energized (off). The PCM
energizes the solenoid valve based on input data
from sensors such as the Throttle Position Sen-
sor, Transmission Range Switch, Stoplight
Switch, Input Shaft Speed Sensor, Output Shaft
Speed Sensor, and Transmission Fluid Tempera-
ture Sensor.

• The PCM provides the ground to energize the

solenoid. The amount of time that the circuit is
grounded is displayed on the scan tool
MB991958 in percent.

• When the solenoid is energized or de-energized,

fluid passes through the valve body and transaxle
passages to apply and release components.

.

DESCRIPTIONS OF MONITOR METHODS
If solenoid terminal voltage is below specified value
when shift control is not in progress, PCM judges
that low-reverse solenoid valve has a failure.

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MONITOR EXECUTION
Continuous

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MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• DTC 41 (P0731): 1st gear incorrect ratio

• DTC 42 (P0732): 2nd gear incorrect ratio

• DTC 43 (P0733): 3rd gear incorrect ratio

• DTC 44 (P0734): 4th gear incorrect ratio

• DTC 46 (P0736): Reverse gear incorrect ratio

• DTC 36 (P0743): Torque converter clutch sole-

noid malfunction

AC102447AF

BATTERY

CONNECTOR: A-17X

A-17X

FRONT OF VEHICLE

ACX02479

CONNECTOR: B-40

AK

B-40

AC002219

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

B-40-4, B-40-5

AO

B-40-1

B-40-2

B-40-4

B-40-3

B-40-5

VALVE BODY
ASSEMBLY

AC001729AY

CONNECTOR: C-07

C-07

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>

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-211

• DTC 32 (P0758): Underdrive solenoid malfunc-

tion

• DTC 33 (P0763): Second solenoid malfunction

• DTC 34 (P0768): Overdrive solenoid malfunction

• DTC 54 (P1751): A/T control relay malfunction

Sensor (The sensor below is determined to be

normal)

• Torque converter clutch solenoid

• Underdrive solenoid

• Second solenoid

• Overdrive solenoid

• A/T control relay

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LOGIC FLOW CHARTS (Monitor Sequence)

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DTC SET CONDITIONS (Entry Conditions and
Malfunction Thresholds)

Check Conditions

• Solenoid status: either solid ON or OFF.

• Shift status: in-gear.

• Voltage of battery: 10 volts or more.

Judgement Criteria

• Solenoid voltage: 3 volts or less. (0.3 second)

AC205281

Good

Malfunction

END

START

In-gear?

Shift solenoid-A is in ON
or OFF steady state

Voltage of battery > 10 V

Solenoid circuit
voltage < 3 V

Continuous failure
for 0.3 sec.

Yes

No

Yes

No

Yes

No

Yes

No

Yes

No

Low-reverse solenoid valve
is in ON or OFF steady state

AB

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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• If DTC 31 (P0753) is set consecutively four times,

the transaxle is locked into 3rd gear as a fail-safe
measure, and the "N" range light flashes once
per second.

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OBD-II DRIVE CYCLE PATTERN
Start the engine, and keep the vehicle stopped in "P"
range for 5 seconds.

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

• Malfunction of the low-reverse solenoid valve

• 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

STEP 1. Using scan tool MB991958, check actuator test
item 01: Low-Reverse Solenoid Valve.

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) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to actuator test mode for item 01:

Low-Reverse Solenoid Valve.

• An audible clicking or buzzing should be heard when the

low-reverse solenoid valve is energized.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?

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

.

NO : Go to Step 2.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824