Mitsubishi Outlander (2013+). Manual — part 366

TROUBLESHOOTING

CVT

23A-34

Code No. P1777: Malfunction of Stepper Motor

DIAGNOSTIC FUNCTION

CVT-ECU conducts fault detection by monitoring the
voltage of each coil for stepper motors.

JUDGEMENT CRITERIA

The specified voltage is not applied to each coil for
stepper motors for 0.2 seconds because of the open
or short circuit.

PROBABLE CAUSES

• Malfunction of valve body assembly (Faulty step-

per motor)

• Damaged wiring harness and connectors

• Malfunction of CVT-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Check for open circuit and short to earth
in SPM1, SPM2, SPM3, SPM4 line between the
CVT-ECU connector and the CVT assembly
(stepper motor)
Between CVT-ECU connector and body earth

OK: Resistance value is approximately 15

Ω.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Go to Step 2.

STEP 2. Check for open circuit and short to earth
in SPM1, SPM2, SPM3, SPM4 line between
CVT-ECU connector and the CVT assembly
(stepper motor)
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 earth.

Q: Is the check result normal?

YES :

Replace the valve body assembly.

NO :

Repair the connector(s) or wiring harness.

STEP 3. Symptom recheck after erasing
diagnosis code

Q: Is the check result normal?

YES :

Intermittent malfunction

NO :

Replace CVT-ECU.

Code No. P1778: Malfunction of Stepper Motor Function

DIAGNOSTIC FUNCTION

CVT-ECU conducts the fault detection of the stepper
motor by comparing the target value of the primary
pulley speed with the actual value. (Target value:
Actual secondary pulley speed multiplied by gear
ratio corresponding to stepper motor position)
(Actual measurement value: Actual primary pulley
speed)

JUDGEMENT CRITERIA

The difference between the target value of the pri-
mary pulley speed and the actual measurement
value is greater than the standard value, the differ-
ence between the target gear ratio and the actual
gear ratio is 0.3 or greater, and this status continues
for 5 seconds.

PROBABLE CAUSES

• Malfunction of CVT-ECU

• Malfunction of valve body assembly (Faulty step-

per motor)

DIAGNOSTIC PROCEDURE

STEP 1. Check other diagnosis codes.

Q: Are other diagnosis codes set?

YES :

Carry out the appropriate troubleshooting.

NO :

Go to Step 2.

STEP 2. Symptom recheck after erasing
diagnosis code

Q: Is the check result normal?

YES :

Intermittent malfunction

NO :

Replace the CVT-ECU, and then go to Step
3.

STEP 3. Retest the system.

Q: Is the check result normal?

YES :

The inspection is complete.

NO :

Replace the valve body assembly.

TROUBLESHOOTING

CVT

23A-35

Code No. P1902: Malfunction of Engine System

DIAGNOSTIC FUNCTION

• When the engine-ECU detects the malfunction of

the ETV system, the engine-ECU enters the
limp-home control mode (throttle valve angle:
approx. 20 %).

• CVT-ECU begins controlling the following items:

lockup inhibition, increase of secondary pressure,
fixing of gear ratio line.

JUDGMENT CRITERIA

CVT-ECU receives the limp-home signal from
engine-ECU via CAN.

PROBABLE CAUSES

• Malfunction of the engine system (ETV)

Code No. U0001: Malfunction of CAN Communication Circuit (Bus off)

DIAGNOSTIC FUNCTION

CVT-ECU conducts bus-off detection.

JUDGEMENT CRITERIA

When malfunction is detected in the CAN communi-
cation system.

PROBABLE CAUSES

• Malfunction of the CAN bus

Code No. U0100: CAN Time-out Error (Engine)

DIAGNOSTIC FUNCTION

CVT-ECU receives periodic communication data
from the engine-ECU via CAN bus lines.

JUDGMENT CRITERIA

CVT-ECU cannot receive the periodic communica-
tion data from the engine-ECU.

PROBABLE CAUSES

• Malfunction of the CAN bus

• Engine ECU malfunction

• Malfunction of CVT-ECU

Code No. U0121: CAN Time-out Error (ABS/ASC)

DIAGNOSTIC FUNCTION

CVT-ECU determines that malfunction is present if
the periodic communication data sent from the
ABS/ASC-ECU via CAN bus lines is abnormal.

JUDGEMENT CRITERIA

CVT-ECU cannot receive the periodic communica-
tion data from ABS/ASC-ECU.

PROBABLE CAUSES

• Malfunction of the CAN bus

• ABS/ASC-ECU malfunction

• Malfunction of CVT-ECU

Code No. U0141: CAN Time-out Error (ETACS)

DIAGNOSTIC FUNCTION

CVT-ECU determines that malfunction is present if
the periodic communication data sent from

ETACS-ECU via the CAN bus lines is abnormal.

TROUBLESHOOTING

CVT

23A-36

JUDGMENT CRITERIA

CVT-ECU cannot receive the periodic communica-
tion data from ETACS-ECU.

PROBABLE CAUSES

• Malfunction of the CAN bus

• Malfunction of ETACS-ECU

• Malfunction of CVT-ECU

Code No. U1195: Coding not implemented

Diagnostic function

CVT-ECU checks that the coding information is nor-
mal.

JUDGEMENT CRITERIA

When the CVT-ECU coding has not been performed.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Variant coding for ETACS-ECU has not been

implemented.

• Malfunction of ETACS-ECU

• Malfunction of CVT-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus lines. (Refer to GROUP
54C

− Troubleshooting .)

STEP 2. Use M.U.T.-III to confirm a diagnosis
code of other systems.
Check if a coding-related diagnosis code is set in the
ETACS-ECU.

Q: Is the diagnosis code set?

YES :

Diagnose the ETACS-ECU. (Refer to

GROUP 54A

− Troubleshooting )

NO :

Go to Step 3.

STEP 3. Diagnosis code recheck
Check again if the diagnosis code is set to
CVT-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the LOCK (OFF)

position to the ON position.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Replace the CVT-ECU.

NO :

Intermittent malfunction.

Code No. U1197: Wrong coding data received

Diagnostic function

CVT-ECU checks that the coding information is nor-
mal.

JUDGEMENT CRITERIA

The ETACS-ECU coding information about whether
the 4WD-ECU is mounted or not is incorrect.

PROBABLE CAUSES

• Malfunction of the CAN bus line

• ETACS-ECU coding information is abnormal

• ETACS-ECU failure or improper assembly

• Malfunction of CVT-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus lines. (Refer to GROUP
54C

− Troubleshooting .)

STEP 2. Use M.U.T.-III to confirm a diagnosis
code of other systems.
Check if the ETACS-ECU sets a diagnosis code.

Q: Is the diagnosis code set?

YES :

Diagnose the ETACS-ECU. (Refer to

GROUP 54A

− Troubleshooting )

NO :

Go to Step 3.

TROUBLESHOOTING

CVT

23A-37

STEP 3. ETACS-ECU coding data check
Using M.U.T.-III, check if any abnormality is present
in the coding data below which is stored in the
ETACS-ECU.

Final drive

OK <2WD vehicles>: Front Drive
OK <4WD vehicles>: 4WD FF Base

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the coding data. If repair is
impossible, replace the ETACS-ECU.

STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to
CVT-ECU.
(1) Erase the diagnosis code.

(2) Turn the ignition switch from the LOCK (OFF)

position to the ON position.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Replace the CVT-ECU.

NO :

Intermittent malfunction.

TROUBLE SYMPTOM CHART

M1231208000754

CAUTION

During diagnosis, a diagnosis code associated
with other system may be set when the ignition
switch is turned on with connector(s) discon-
nected. On completion, confirm all systems for
diagnosis code(s). If diagnosis code(s) are set,
erase them all.

Trouble symptom

Inspection
procedure
number

Reference
page

CVT-ECU cannot communicate with M.U.T.-III.

1

P.23A-37

Vehicle creeps in the "N" range.

2

P.23A-38

Shock is experienced during "N" to "D" and/or "N" to "R" shifting operation.

3

P.23A-38

Poor acceleration or incomplete shifting operation

4

P.23A-39

Gears cannot be changed with the paddle shift

5

P.23A-39

The fluid temperature warning lamp illuminates too frequently

6

P.23A-40

SYMPTOM PROCEDURES

Inspection Procedure 1: CVT-ECU cannot communicate with M.U.T.-III.

SYMPTOMS

CVT-ECU cannot be turned ON.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Malfunction of CVT-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Check for short circuit in power supply
line between the fusible link No.37 and the CVT
control relay connector.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the connector(s) or wiring harness.

STEP 2. Check for short circuit in VIG1, VIG2 line
between the CVT control relay connector and the
CVT-ECU connector.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the connector(s) or wiring harness.

STEP 3. Check for open circuit in GND1, GND2
line between the CVT-ECU connector and earth.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the connector(s) or wiring harness.

STEP 4. Retest the system.
Recheck the trouble symptom.

Q: Does the malfunction take place again?