Mitsubishi Outlander GS45X. Manual - part 1637

DIAGNOSIS

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CVT

23A-105

STEP 2. Symptom recheck after erasing diagnosis code
Q: Is the check result normal?

YES : Intermittent malfunction
NO :  Replace TCM.

DTC P1777: Malfunction of Stepper Motor

STEPPER MOTOR

CVT
ASSEMBLY

TRANSAXLE
CONTROL MODULE

Stepper motor  system circuit

AC709490

Connector: A-12

AB

AC709493

AD

Connector: B-125

B-125 (B)

DIAGNOSIS

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CVT

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.

DIAGNOSTIC FUNCTION

TCM conducts fault detection by monitoring the volt-
age of each coil for stepper motors.

.

DESCRIPTIONS OF MONITOR METHODS

• The specified voltage is not applied to each coil 

for stepper motors for 0.2 second because of an 
open or short circuit.

.

MONITOR EXECUTION

• Continuous

.

MONITOR EXECUTION CONDITIONS 
(OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• P0741: Abnormality in lockup function

• P0746: Abnormality in hydraulic control system 

function

• P0841: Abnormality in line pressure sensor func-

tion

• P0868: Secondary pressure drop

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

AC703253

Connector: C-37

Brake pedal

AC

DIAGNOSIS

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CVT

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LOGIC FLOW CHARTS (Monitor Sequence)

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DTC SET CONDITIONS

JUDGMENT CRITERIA

• Stepping motor activation command (ON volt-

age): 2.8 volts or less. (0.2 second)

• Stepping motor activation command (OFF volt-

age): More than 2.8 volts. (0.2 second)

.

OBD-II DRIVE CYCLE PATTERN

Ignition switch : ON (start the engine and keep it for 
10 seconds or more)

.

PROBABLE CAUSES

• Malfunction of valve body assembly (Faulty step-

per motor)

• Damaged wiring harness and connectors

• Malfunction of TCM

AC802634

START

Yes

No

             Circuit A or B or C or D
activation command on at circuit voltage     2.8 V

             Circuit A or B or C or D
activation command off at circuit voltage > 2.8 V

No

No

Good

Malfunction

END

Yes

Continuous failure for 0.2 sec

Yes

DIAGNOSIS

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CVT

23A-108

DIAGNOSTIC PROCEDURE

STEP 1. Check the following connector:

• B-125 CVT assembly connector

• C-37 TCM connector

Check the terminals for a contact status problem and internal 
short circuit.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Repair the defective connector.

STEP 2. Check for open circuit and short to ground in the 
wiring harness between the TCM connector and the 
stepper motor.

• Between TCM connector (terminal No.40) and body ground

• Between TCM connector (terminal No.41) and body ground

• Between TCM connector (terminal No.51) and body ground

• Between TCM connector (terminal No.52) and body ground

OK: Resistance value is approximately 15 

Ω.

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Go to Step 3.

STEP 3. Check for open circuit and short to ground in the 
wiring harness between TCM and the stepper motor

• Between C-37 TCM connector (terminal No.40) and B-125 

CVT assembly connector (terminal No.8)

• Between C-37 TCM connector (terminal No.41) and B-125 

CVT assembly connector (terminal No.9)

• Between C-37 TCM connector (terminal No.51) and B-125 

CVT assembly connector (terminal No.10)

• Between C-37 TCM connector (terminal No.52) and B-125 

CVT assembly connector (terminal No.11)

Check that there is no continuity in both sides of the connectors 
and that no short circuit is present between the connectors and 
the body ground.
Q: Is the check result normal?

YES : Replace the valve body assembly.
NO :  Repair the wiring harness.

STEP 4. Symptom recheck after erasing diagnostic trouble 
code
Q: Is the check result normal?

YES : Intermittent malfunction
NO :  Replace TCM.