Mitsubishi Montero (2004+). Manual — part 922
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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LOGIC FLOW CHARTS (Monitor Sequence) <DTC 46 (P0736)>
.
DTC SET CONDITIONS <DTC 46 (P0736)>
Check Conditions
• Engine speed: 450 r/min or more.
• Output speed: 350 r/min or more.
• Shift stage: reverse gear.
• Input speed: more than 0 r/min.
• Transmission fluid temperature sensor voltage:
4.5 volts or less.
• Voltage of battery: 10 volts or more.
Yes
No
No
N
E
:
Engine speed
START
Yes
No
Transmission fluid temperature
sensor voltage < 4.5 V
There is only one transmission
range switch signal
Yes
N
E
> 450 r/min
N
OPG-B
> 350 r/min
N
IPG-A
> 0 r/min
Continuous failure for 4 secs.
Good
END
N
OPG-B
: Output speed
(output shaft speed sensor)
No
Yes
No
No
Yes
No
Yes
Yes
Malfunction
Shift change is finished
N
IPG-A
: Input speed
(input shaft speed sensor)
I
r
: Reverse g
ear ratio
AC205248
Timer start
Timer > 2 secs.
Voltage of battery > 10 V
Shift stage commanded
by A/T ECM is reverse
No
Yes
Yes
No
I
r
× N
OPG-B
- 200 < N
IPG-A
< I
r
× N
OPG-B
+ 200
AB
Shift stage commanded
by PCM is reverse
AUTOMATIC TRANSMISSION DIAGNOSIS
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• Transmission range switch rationality: only one
signal.
• Time after shift changing finish: 2 seconds or
more.
Judgement Criteria
• Output speed: [(input speed + 200 r/min) /
reverse gear ratio] or more. (4 seconds)
• Output speed: [(input speed - 200 r/min) / reverse
gear ratio] or less. (4 seconds)
• If DTC 46 (P0736) is set consecutively four times,
the transmission is locked into 3rd gear as a
fail-safe measure, and the "N" range light flashes
once per second.
.
OBD-II DRIVE CYCLE PATTERN <DTC 46
(P0736)>
Start the engine, and drive in R range at 15 km/h (9
mph) or more for 10 seconds.
.
TROUBLESHOOTING HINTS (THE MOST LIKELY
CAUSES FOR THIS CODE TO BE SET ARE:)
• Malfunction of the input shaft speed sensor
• Malfunction of the output shaft speed sensor
• Malfunction of the PCM
• Malfunction of the reverse clutch retainer
• Malfunction of the direct planetary carrier
• Malfunction of the low-reverse brake system
(DTC 41 or DTC 46)
• Malfunction of the underdrive clutch system (DTC
41, DTC 42, DTC 43 or DTC 44)
• Malfunction of the second brake system (DTC 42
or DTC 45)
• Malfunction of the overdrive clutch system (DTC
43, DTC 44 or DTC 45)
• Malfunction of the reverse clutch system (DTC
46)
• Malfunction of the direct clutch system (DTC 44
or DTC 45)
• Malfunction of the reduction brake system (DTC
41, DTC 42, DTC 43 or DTC 46)
• Electrical noise generated
DIAGNOSIS
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 1. Using scan tool MB991958, read the A/T
diagnostic trouble code.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC set?
YES <DTC 22 set> : Refer to
, DTC 22: Input
Shaft Speed Sensor System.
YES <DTC 23 set> : Refer to
, DTC 23: Output
Shaft Speed Sensor System.
YES <DTC 31 set> : Refer to
, DTC 31:
Low-Reverse Solenoid Valve System.
YES <DTC 32 set> : Refer to
, DTC 32:
Underdrive Solenoid Valve System.
YES <DTC 33 set> : Refer to
, DTC 33: Second
Solenoid Valve System.
YES <DTC 34 set> : Refer to
, DTC 34:
Overdrive Solenoid Valve System.
YES <DTC 35 set> : Refer to
, DTC 35:
Reduction Solenoid Valve System.
NO : Go to Step 2.
STEP 2. Check the hydraulic pressure.
Each hydraulic pressure of the elements below, which DTCs
indicate, should be within the standard value.
• DTC 41: Underdrive clutch, low-reverse brake and reduc-
tion brake.
• DTC 42: Underdrive clutch, second brake and reduction
brake.
• DTC 43: Underdrive clutch, overdrive clutch and reduction
brake.
• DTC 44: Underdrive clutch, overdrive clutch and direct
clutch.
• DTC 45: Overdrive clutch, direct clutch and second brake.
• DTC 46: Reverse clutch and low-reverse brake and reduc-
tion brake.
Q: Does the hydraulic pressures meet the standard value
range?
YES : Go to Step 5.
NO <out of the range in one place> : Go to Step 4.
NO <out of the range in all places> : Go to Step 3.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
AUTOMATIC TRANSMISSION DIAGNOSIS
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STEP 3. Adjust the line pressure.
Adjust the line pressure. Refer to
, Line Pressure
Adjustment. Then check the symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 4.
STEP 4. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and valve
body for damage. Repair or replace the faulty parts. Refer to
GROUP 23B, Valve Body
.
Replace the valve body assembly if the damages are thought
to be irreparable. Then check the symptom.
Q: Is the repair possible and the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 6.
STEP 5. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Were any A/T DTCs set?
YES : Go to Step 6.
NO : The procedure is complete.
ACX02161AD
VALVE BODY ASSEMBLY
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