Mitsubishi Outlander GS45X. Manual — part 1638
DIAGNOSIS
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CVT
23A-109
DTC P1778: Abnormality In Stepper Motor Function
.
STEPPER MOTOR SYSTEM CIRCUIT
Refer to
.
.
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)
.
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.
.
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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CVT
23A-110
DTC P1902: Malfunction of Engine System
.
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.
.
JUDGEMENT CRITERIA
TCM receives the limp-home signal from ECM via
CAN.
.
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
.
DIAGNOSTIC FUNCTION
TCM conducts bus-off detection.
.
DESCRIPTIONS OF MONITOR METHODS
• TCM cannot receive the periodic communication
data.
.
MONITOR EXECUTION
• When 1.05 seconds have elapsed after TCM
started
.
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
.
DIAGNOSIS
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CVT
23A-111
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
.
OBD-II DRIVE CYCLE PATTERN
Ignition switch : ON (start the engine and keep it for
10 seconds or more)
.
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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CVT
23A-112
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
DTC U0100: CAN Time-out Error (Engine)
.
DIAGNOSTIC FUNCTION
TCM receives periodic communication data from the
ECM via CAN bus lines.
.
JUDGMENT CRITERIA
TCM cannot receive the periodic communication
data from the ECM.
.
DESCRIPTIONS OF MONITOR METHODS
• TCM cannot receive the periodic communication
data from the ECM.
.
MONITOR EXECUTION
• When 1.05 seconds have elapsed after TCM
started
.
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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