Mitsubishi Montero (2002-2004). Manual — part 933

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-215

DTC 41: 1st Gear Incorrect Ratio
DTC 42: 2nd Gear Incorrect Ratio
DTC 43: 3rd Gear Incorrect Ratio
DTC 44: 4th Gear Incorrect Ratio
DTC 45: 5th Gear Incorrect Ratio
DTC 46: Reverse Gear Incorrect Ratio

AC205194AB

Input Shaft Speed Sensor and Output Shaft Speed Sensor System Circuit

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-216

AC204746

CONNECTOR : C-02

C-02 (GR)

AB

1 2 3

AC204747

CONNECTOR : C-16

C-16 (B)

AB

1

3

2

AC204170

CONNECTOR : D-01

CD

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33

AC204681AC

CONNECTOR: D-134

D-134 (GR)

61 62

63 64

65 66 67 68 69 70 71 72 73

82

89

81

88

80

79

78

77

87

86

85

76

75

74

84

83

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-217

.

CIRCUIT OPERATION

• The input shaft speed sensor generates a pulsed

signal of 0

⇔ 5 volts. The pulsed signal fre-

quency increases with an increase in the input
shaft speed.

• The PCM (terminal 64) continuously monitors the

input shaft speed signal.

• The output shaft speed sensor generates a

pulsed signal of 0

⇔ 5 volts. The pulsed signal

frequency increases with an increase in the out-
put shaft speed.

• The PCM (terminal 73) continuously monitors the

output shaft speed signal.

.

DTC SET CONDITIONS
If the PCM receives a signal (multiplied by the 1st
gear ratio) from the output shaft speed sensor that is
not the same as the signal received from the input
shaft speed sensor (while driving with the transmis-
sion in 1st gear), DTC 41 is set. If DTC 41 is set four
times, the transmission is locked into 3rd gear as a
fail-safe measure, and the "N" range light flashes
once per second.

.

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

AC204191

CONNECTORS : D-208, D-212

5 6

2

4

3

1

JUNCTION BLOCK
(FRONT VIEW)

3

10

9

4

11

8

7

1

5

2

6

D-208

D-208

D-212

D-212

AS

AC204194

CONNECTORS : E-11, E-114

3

10

16

9

7 8

6

1

4

2

5

11

14

1213

15

BC

E-11

E-114

E-11

E-114

38

28

16

33

22

10

31

19

7

1

18

30

29

17

5

6

21

20

32

8

2

9

25

13

3

24

23

3435

1112

27

26

3637

14

4

15

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, read the A/T
diagnostic trouble code.

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 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 A/T DTC 22 or 23 set?

YES : Refer to

P.23Ac-47

, DTC 22: Input Shaft Speed

Sensor System, or refer to

P.23Ac-65

, DTC 23:

Output Shaft Speed Sensor System.

NO : Go to Step 2.

STEP 2. Using scan tool MB991502, check actuator test.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to actuator test mode for following

items.

a. item 01: Low-reverse Solenoid Valve
b. item 02: Underdrive Solenoid Valve

c. item 03: Second Solenoid Valve

d. item 04: Overdrive Solenoid Valve
e. item 05: Reduction Solenoid Valve

• An audible clicking or buzzing should be heard when

the solenoid valves are energized.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are the solenoid valves operating properly?

YES : Go to Step 3.
NO : Replace the defective solenoid valves. Refer to

GROUP 23B, Valve Body

P.23B-80

.

ACX01539AD

MB991502

16-PIN

ACX01539AD

MB991502

16-PIN