Mitsubishi Outlander GS45X. Manual - part 1638

DIAGNOSIS

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23A-109

DTC P1778: Abnormality In Stepper Motor Function

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STEPPER MOTOR SYSTEM CIRCUIT

 Refer to 

P.23A-105

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DIAGNOSTIC FUNCTION

TCM 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 pulley 
ratio corresponding to stepper motor position) 
(Actual measurement value: Actual primary pulley 
speed)

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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 pulley ratio and the actual 
pulley ratio is 0.3 or greater, and this status contin-
ues for 5 seconds.

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PROBABLE CAUSES

• Malfunction of TCM

• 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 TCM, 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.

DIAGNOSIS

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23A-110

DTC P1902: Malfunction of Engine System

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DIAGNOSTIC FUNCTION

• When the ECM detects the malfunction of the 

ETV system, the ECM enters the limp-home con-
trol mode (throttle valve angle: approximately 
20%).

• TCM begins controlling the following items: 

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

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JUDGEMENT CRITERIA

TCM receives the limp-home signal from ECM via 
CAN.

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PROBABLE CAUSES

• Malfunction of the engine system (ETV)

DIAGNOSIS PROCEDURE

STEP 1. Check the engine-related diagnosis code.
Q: Is the engine-related diagnosis code 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 TCM.

DTC U0001: Malfunction of CAN Communication Circuit

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DIAGNOSTIC FUNCTION

TCM conducts bus-off detection.

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DESCRIPTIONS OF MONITOR METHODS

• TCM cannot receive the periodic communication 

data.

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MONITOR EXECUTION

• When 1.05 seconds have elapsed after TCM 

started

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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)

• P0703: Malfunction of stoplight switch

• P0705: Malfunction of transmission range switch

• P0715: Malfunction of primary pulley speed sen-

sor

• P0720: Malfunction of secondary pulley speed 

sensor

• P0725: Malfunction of engine speed

• P0741: Abnormality in lockup function

• P0746: Abnormality in hydraulic control system 

function

• P0841: Abnormality in line pressure sensor func-

tion

• P0868: Secondary pressure drop

• P1706: Malfunction of throttle signal

• P1773: Malfunction of ABS

• U0100: CAN time-out error (Engine)

Sensor (The sensor below is determined to be 

normal)

• Stoplight switch

• Transmission range switch

• Primary pulley speed sensor

• Secondary pulley speed sensor

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DIAGNOSIS

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LOGIC FLOW CHARTS (Monitor Sequence)

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DTC SET CONDITIONS

Check Conditions

• Time after TCM start: more than 1.05 seconds.

• Voltage of battery: 9 volts or more

• Voltage of battery: 16 volts or less

Judgment Criteria

• CAN communication: fail

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OBD-II DRIVE CYCLE PATTERN

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

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PROBABLE CAUSES

• Malfunction of the CAN bus

AC802635

START

Yes

No

No

No

CAN communication is fail

Yes

Yes

Yes

Good

Malfunction

Timer stat

END

No

Timer > 1.05 secs

TCM is started

All secondary parameters
are in the enable condition.

DIAGNOSIS

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DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?

YES : Intermittent malfunction
NO :  Repair the CAN bus lines (Refer to GROUP 54C 

− 

Troubleshooting, Diagnosis Code Chart 

P.54C-19

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DTC U0100: CAN Time-out Error (Engine)

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DIAGNOSTIC FUNCTION

TCM receives periodic communication data from the 
ECM via CAN bus lines.

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JUDGMENT CRITERIA

TCM cannot receive the periodic communication 
data from the ECM.

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DESCRIPTIONS OF MONITOR METHODS

• TCM cannot receive the periodic communication 

data from the ECM.

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MONITOR EXECUTION

• When 1.05 seconds have elapsed after TCM 

started

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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)

• P0725: Malfunction of engine speed

• P0868: Secondary pressure drop

Sensor (The sensor below is determined to be 

normal)

• Not applicable

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