Mitsubishi Grandis. Manual — part 854

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-83

DIAGNOSIS

STEP 1. MUT-III data list

Item 54: Relay voltage (Refer to data list reference
table

P.23A-117

).

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction

P.00-5

).

NO :

Go to Step 2.

STEP 2. Check the A/T control relay connector

Refer to

P.23A-130

.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Replace the A/T control relay.

STEP 3. Connector check: B-14X A/T control
relay connector

Check for the contact with terminals.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the defective connector.

STEP 4. Measure the voltage at A/T control relay
connector B-14X.

Disconnect the A/T control relay, and measure the
voltage between terminal No.4 and earth at the relay
box side.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Go to Step 5.

STEP 5. Connector check: A-16 intermediate
connector

Check for the contact with terminals.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the defective connector.

STEP 6. Check the harness between A/T control
relay connector B-14X terminal No.4 and battery.

Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the wiring harness.

STEP 7. MUT-III data list

Item 54: Relay voltage (Refer to data list reference
table

P.23A-117

).

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

Cope with Intermittent Malfunction

P.00-5

).

NO :

Replace the engine-A/T-ECU.

AC311979AC

B-14X

Connector: B-14X

Front of
vehicle

Relay box
side

AC311979AC

B-14X

Connector: B-14X

Front of
vehicle

Relay box
side

AC310403

AJ

Connector: A-16

A-16 (B)

11

7 8

10

9

1 2

4

3

5

12

6

AC311979AC

B-14X

Connector: B-14X

Front of
vehicle

Relay box
side

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-84

STEP 8. Measure the voltage at the A/T control
relay connector B-14X.
(1) Turn the ignition switch to the ON position.

(2) Disconnect the A/T control relay, and measure

the voltage between terminal No.3 and earth at
the relay box side.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Go to Step 9.

AC311979AC

B-14X

Connector: B-14X

Front of
vehicle

Relay box
side

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-85

STEP 9. Connectors check: C-116 J/C (4), C-33
J/C (7) <RHD>, C-18 intermediate connector,
C-203 J/B connector

Check for the contact with terminals.

AC310615

AT

Connectors: C-18, C-116
<LHD>

C-18

2

6

1

5

9

3

7 8

10

4

C-116

23

12

1

7

29

18

4

26

15

1314

25

24

2 3

1617

28

27

5 6

10

32

21

1920
3031

8 9

22
33

11

C-18

C-116

AC310628AX

Connectors: C-18, C-116
<RHD>

C-18

C-18

2

6

1

5

9

3

7 8

10

4

C-116

23

12

1

7

29

18

26

13

25

24

2

28

27

4

15

14

3

1617

5 6

10

32

21

1920
3031

8 9

22
33

11

C-18

C-116

AC310631AV

C-33

Connector: C-33
<RHD>

2

1

3

13

12

14

21

10

5

4

6

16

15

17

7 8 9

19

18

20

11

22

AC310623

Connectors: C-203 <LHD>

AL

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

AC310618

Connectors: C-203 <RHD>

AK

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-86

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Repair the defective connector.

STEP 10. Check the wiring harness between A/T
control relay connector B-14X terminal No.3 and
junction block connector C-203 terminal No.12.

Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the wiring harness.

STEP 11. Measure the voltage at engine-A/T-ECU
connector C-114.
(1) Install the A/T control relay.
(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between engine-A/T-ECU

connector C-114 terminal No.123, No.124 and
earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 14.

NO :

Go to Step 12.

AC311979AC

B-14X

Connector: B-14X

Front of
vehicle

Relay box
side

AC310623

Connectors: C-203 <LHD>

AL

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

AC310618

Connectors: C-203 <RHD>

AK

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

AC311284 AI

Connector: C-114 <LHD>

Connector: C-114 <RHD>

Engine-A/T-ECU

C-114 (GR)

C-114 (GR)

Engine-A/T-ECU

Harness side

124 123

130

131

132

133
141 140 139 138
146 145

129
137

128
136

127126

135
143

121
125
134
142

144

122