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
23A-106
.
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
23A-107
LOGIC FLOW CHARTS (Monitor Sequence)
.
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.
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