Mitsubishi Grandis. Manual — part 848

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-59

STEP 10. Check the harness between inhibitor
switch connector B-111 terminal No.1 and shift
switch assembly connector C-121 terminal No.1.

Check the output line for short circuit.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the wiring harness.

Code No.28: Inhibitor switch system

INHIBITOR SWITCH SYSTEM CIRCUIT

Refer to

P.23A-52

.

OPERATION

Refer to

P.23A-52

.

DIAGNOSIS CODE SET CONDITIONS

If the inhibitor switch has been sending multiple
signals for at least 30 seconds, the circuit may be
open and diagnosis code No.28 will be set.

POSSIBLE CAUSES

• Malfunction of the inhibitor switch

• Damaged harness wires and connectors

• Malfunction of the engine-A/T-ECU

DIAGNOSIS

STEP 1. Check the inhibitor switch.

Refer to

P.23A-128

.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Replace the inhibitor switch.

AC303714AH

Connector: B-111

B-111 (B)

Harness side

AC310613

BA

C-121

Connector: C-121
<LHD>

Harness side

AC310631AW

C-121

Harness side

Connector: C-121
<RHD>

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-60

STEP 2. Connector check: B-111 Inhibitor switch
connector, C-112 engine-A/T-ECU connector

Check for the contact with terminals.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the defective connector.

STEP 3. Check the harness between inhibitor
switch connector B-111 terminal No.3, 7, 4, 1 and
engine-A/T-ECU connector C-112 terminal No.66,
67, 75, 76.

Check the output line for short circuit.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the wiring harness.

AC303714AH

Connector: B-111

B-111 (B)

Harness side

AC311284

Connector: C-112 <LHD>

Connector: C-112 <RHD>

Harness side

Engine-A/T-ECU

C-112 (GR)

C-112 (GR)

Engine-A/T-ECU

AG

AC303714AH

Connector: B-111

B-111 (B)

Harness side

AC311284

Connector: C-112 <LHD>

Connector: C-112 <RHD>

Harness side

Engine-A/T-ECU

C-112 (GR)

C-112 (GR)

Engine-A/T-ECU

AG

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-61

STEP 4. Connector check: C-121 shift switch
assembly connector, C-17 intermediate
connector

Check for the contact with terminals.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the defective connector.

STEP 5. Check the harness between inhibitor
switch connector B-111 terminal No.1 and shift
switch assembly connector C-121 terminal No.1.

Check the output line for short circuit.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the wiring harness.

STEP 6. MUT-III data list

Item 61: Inhibitor switch (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 :

Replace the engine-A/T-ECU.

AC310613

BA

C-121

Connector: C-121
<LHD>

Harness side

AC310631AW

C-121

Harness side

Connector: C-121
<RHD>

AC310615

AR

Connector: C-17
<LHD>

C-17

AC310628

Connector: C-17
<RHD>

AV

C-17

AC303714AH

Connector: B-111

B-111 (B)

Harness side

AC310613

BA

C-121

Connector: C-121
<LHD>

Harness side

AC310631AW

C-121

Harness side

Connector: C-121
<RHD>

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-62

Code No.31: Low-reverse solenoid valve system

OPERATION

• Solenoid valve closes or opens according to the

signals from the engine-A/T-ECU.

BATTERY

RELAY
BOX

A/T
CONTROL
RELAY

A/T CONTROL
SOLENOID
VALVE ASSEMBLY

ENGINE-
A/T-ECU

UNDERDRIVE
SOLENOID
VALVE

SECOND
SOLENOID
VALVE

OVERDRIVE
SOLENOID
VALVE

DAMPER
CLUTCH
CONTROL
SOLENOID
VALVE

LOW AND
REVERSE
SOLENOID
VALVE

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet

Solenoid valve system circuit