Mitsubishi Montero (2002-2004). Manual - part 866
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION DIAGNOSIS
23Ab-5
INSPECTION USING SCAN TOOL MB991502,
ROAD TEST AND DATA LIST
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to data link connector.
2. Turn the ignition switch to the "ON" position.
3. Carry out the inspection by means of the Road Test and the
Data List function. If there is an abnormality, check and
repair the chassis harnesses and components. Refer to
, Road Test. Refer to
, Data List
Reference Table.
4. Re-check using scan tool MB991502 and confirm that the
abnormal input and output have returned to normal because
as a result of the repairs.
5. Check for and inspect any diagnostic trouble codes (DTCs)
that may have surfaced from testing. Erase the diagnostic
trouble codes after checking.
6. Turn the ignition switch to the "LOCK" (OFF) position.
7. Disconnect scan tool MB991502 from the data link
connector.
8. Start the engine again and do a test drive to confirm that the
problem is eliminated.
FAIL-SAFE/BACKUP FUNCTION
M1231101100106
When a malfunction of a main sensor or actuator is
detected by the PCM, the transmission is controlled
by pre-set control logic to maintain safe conditions
for driving.
The following table shows how the fail-safe/backup
function affects vehicle driveability and operation.
ACX01539AD
MB991502
16-PIN
MALFUNCTIONING ITEM JUDGMENT CONDITION
CONTROL DEFAULT DURING MALFUNCTION
Input shaft speed sensor
If no output pulse from the
input shaft speed sensor is
detected for one second or
more when the vehicle
speed is 30 km/h (19 mph)
or greater.
The diagnostic trouble code is recorded when the
malfunction occurs once during 4 monitoring
periods in one drive cycle. When the judgment
condition is met, the transmission holds 3rd gear
or 2nd gear, depending on speed and "N" range
light flashes as a fail-safe.
Output shaft speed sensor Output from the output
shaft speed sensor is
continuously 50 % or less
of the output from the
vehicle speed sensor one
second or more when the
vehicle speed is 30 km/h
(19 mph) or more.
The diagnostic trouble code is recorded when the
malfunction occurs once during 4 monitoring
periods in one drive cycle. When the judgment
condition is met, the transmission holds 3rd gear
or 2nd gear, depending on speed and "N" range
light flashes as a fail-safe.