Mitsubishi Montero (2004+). Manual - part 988

A/T FAULTY OPERATION PREVENTION MECHANISM DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-527

A/T FAULTY OPERATION PREVENTION MECHANISM 

DIAGNOSIS

INTRODUCTION TO A/T KEY INTERLOCK AND SHIFT LOCK MECHANISMS

M1232001600271

If the key interlock and shift lock mechanisms indi-
cates a malfunction, the key interlock cable, the shift 
lock cable, or the selector lever assembly may be 
defective. In this case, follow troubleshooting below.

A/T KEY INTERLOCK AND SHIFT LOCK MECHANISM DIAGNOSTIC 
TROUBLESHOOTING STRATEGY

M1232001700278

Use these steps to plan your diagnostic strategy. If 
your follow then carefully, you will be sure that you 
have exhausted most of the possible ways to find 
automatic transmission key interlock and shift lock 
mechanism fault.
1. Gather information from the customer.

2. Verify that the condition described by the 

customer exists.

3. Find the malfunction by following the Symptom 

Chart.

4. Verify malfunction is eliminated.

SYMPTOM CHART <A/T FAULTY OPERATION PREVENTION MACHANISM>

M1232001800479

51

Buzzer

Ignition switch: ON

When buzzer not 
sounds

Battery positive voltage

When buzzer 
sounds

0 V 

⇔ battery positive 

voltage

52

4LLc indicator light

• Ignition switch: 

ON

• Transmission 

range: N

Transfer shift lever 
position: 4LLc

1 V or less

Transfer shift lever 
position: Other 
than 4LLc

Battery positive voltage

TERMINAL 
NO.

INSPECTION ITEMS

INSPECTION REQUIREMENT

NORMAL CONDITION

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

Selector lever can be moved from "P" to "R" position without depressing 
brake pedal when ignition key is at any position other than "LOCK" 
(OFF) position.

1

P.23A-528

Selector lever cannot be moved from "P" to "R" position with brake 
pedal depressed when ignition key is at any position other than "LOCK" 
(OFF) position.

2

P.23A-529

Selector lever can be moved from "P" to "R" position with brake pedal 
depressed when ignition key is at "LOCK" (OFF) position.

3

P.23A-530

Selector lever cannot be moved from "P" to "R" position smoothly.

4

P.23A-531

A/T FAULTY OPERATION PREVENTION MECHANISM DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-528

SYMPTOM PROCEDURES <KEY INTERLOCK AND SHIFT LOCK MECHANISMS>

INSPECTION PROCEDURE 1: Selector Lever can be Moved from "P" to "R" Position without 
Depressing Brake Pedal when Ignition Key is at Positions other than "LOCK" (OFF) Position.

.

TECHNICAL DESCRIPTION (COMMENT)
Lock cam or shift lock cable may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of lock cam

• Malfunction of shift lock cable

DIAGNOSIS

STEP 1. Check the fit of the lock cam.

Q: Is the lock cam installed correctly?

YES : 

Go to Step 2.

NO : 

Install the lock cam correctly. Refer to 

P.23A-559

. When the brake pedal is 

released with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can not be 
moved from "P" position to "R" position.

STEP 2. Check the lock cam.

Q: Is the lock cam in good condition?

YES : 

Go to Step 3.

NO : 

Replace the lock cam. Refer to 

P.23A-559

. 

When the brake pedal is released with the 
ignition key at other positions than "LOCK" 
(OFF) position, check that the selector lever 
can not be moved from "P" position to "R" 
position.

STEP 3. Check the fit of the shift lock cable.

Q: Is the shift lock cable installed correctly?

YES : 

Go to Step 4.

NO : 

Install the shift lock cable correctly. Refer to 

P.23A-561

. When the brake pedal is 

released with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can not be 
moved from "P" position to "R" position.

STEP 4. Check the shift lock cable.

Q: Is the shift lock cable in good condition?

YES : 

No action to be taken.

NO : 

Replace the shift lock cable. Refer to 

P.23A-561

. When the brake pedal is 

released with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can not be 
moved from "P" position to "R" position.

Selector lever cannot be moved from "P" to "R" position.

5

P.23A-532

Ignition key cannot be turned to "LOCK" (OFF) position when selector 
lever is at "P" position.

6

P.23A-533

Ignition key can be turned to "LOCK" (OFF) position when selector lever 
is at any position other than "P" position.

7

P.23A-534

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE 
PAGE

A/T FAULTY OPERATION PREVENTION MECHANISM DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-529

INSPECTION PROCEDURE 2: Selector Lever cannot be Moved from "P" to "R" Position with Brake 
Pedal Depressed when Ignition Key is at Positions other than "LOCK" (OFF) Position.

.

TECHNICAL DESCRIPTION (COMMENT)
Selector lever assembly, shift lock cable, key inter-
lock cable, transmission control cable, or lock cam 
may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of selector lever assembly

• Malfunction of shift lock cable

• Malfunction of key interlock cable

• Malfunction of transmission control cable

• Malfunction of lock cam

DIAGNOSIS

STEP 1. Check the connection of lock cam and 
key interlock cable.

Q: Is the connection of lock cam and key interlock 

cable in good condition?
YES : 

Go to Step 2.

NO : 

Repair the connection of lock cam and shift 
lock cable. When the brake pedal is 
depressed with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can be moved 
from "P" position to "R" position.

STEP 2. Check the connection of selector lever 
assembly and shift transmission control cable.

Q: Is the connection of selector lever assembly and 

shift transmission control cable in good condition?
YES : 

Go to Step 3.

NO : 

Repair the connection of selector lever 
assembly and shift transmission control 
cable. When the brake pedal is depressed 
with the ignition key at other positions than 
"LOCK" (OFF) position, check that the 
selector lever can be moved from "P" 
position to "R" position.

STEP 3. Check the fit of the shift lock cable.

Q: Is the shift lock cable installed correctly?

YES : 

Go to Step 4.

NO : 

Install the shift lock cable correctly. Refer to 

P.23A-561

. When the brake pedal is 

depressed with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can be moved 
from "P" position to "R" position.

STEP 4. Check the shift lock cable.

Q: Is the shift lock cable in good condition?

YES : 

Go to Step 5.

NO : 

Replace the shift lock cable. Refer to 

P.23A-561

. When the brake pedal is 

depressed with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can be moved 
from "P" position to "R" position.

STEP 5. Check the fit of the key interlock cable.

Q: Is the key interlock cable installed correctly?

YES : 

Go to Step 6.

NO : 

Install the key interlock cable correctly. 
Refer to 

P.23A-561

. When the brake pedal 

is depressed with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can be moved 
from "P" position to "R" position.

STEP 6. Check the key interlock cable.

Q: Is the key interlock cable in good condition?

YES : 

Go to Step 7.

NO : 

Replace the key interlock cable. Refer to 

P.23A-561

. When the brake pedal is 

depressed with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can be moved 
from "P" position to "R" position.

STEP 7. Check the fit of the transmission control 
cable.

Q: Is the transmission control cable installed 

correctly?
YES : 

Go to Step 8.

NO : 

Install the transmission control cable 
correctly. Refer to 

P.23A-556

. When the 

brake pedal is depressed with the ignition 
key at other positions than "LOCK" (OFF) 
position, check that the selector lever can 
be moved from "P" position to "R" position.

A/T FAULTY OPERATION PREVENTION MECHANISM DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-530

STEP 8. Check the transmission control cable.

Q: Is the transmission control cable in good 

condition?
YES : 

Repair or replace the selector lever 

assembly. Refer to 

P.23A-556

 and 

P.23A-559

. When the brake pedal is 

depressed with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can be moved 
from "P" position to "R" position.

NO : 

Replace the transmission control cable. 
Refer to 

P.23A-556

. When the brake pedal 

is depressed with the ignition key at other 
positions than "LOCK" (OFF) position, 
check that the selector lever can be moved 
from "P" position to "R" position.

INSPECTION PROCEDURE 3: Selector Lever can be Moved from "P" to "R" Position with Brake Pedal 
Depressed when Ignition Key is at "LOCK" (OFF) Position.

.

TECHNICAL DESCRIPTION (COMMENT)
Key interlock cable or lock cam may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of lock cam

• Malfunction of key interlock cable

DIAGNOSIS

STEP 1. Check the connection of lock cam and 
key interlock cable.

Q: Is the connection of lock cam and key interlock 

cable in good condition?
YES : 

Go to Step 2.

NO : 

Repair the connection of lock cam and shift 
lock cable. When the brake pedal is 
depressed with the ignition key at the 
"LOCK" (OFF) position, check that the 
selector lever can not be moved from "P" 
position to "R" position.

STEP 2. Check the fit of the lock cam.

Q: Is the lock cam installed correctly?

YES : 

Go to Step 3.

NO : 

Install the lock cam correctly. Refer to 

P.23A-559

. When the brake pedal is 

depressed with the ignition key at the 
"LOCK" (OFF) position, check that the 
selector lever can not be moved from "P" 
position to "R" position.

STEP 3. Check the lock cam.

Q: Is the lock cam in good condition?

YES : 

Go to Step 4.

NO : 

Replace the lock cam. Refer to 

P.23A-559

. 

When the brake pedal is depressed with the 
ignition key at the "LOCK" (OFF) position, 
check that the selector lever can not be 
moved from "P" position to "R" position.

STEP 4. Check the fit of the key interlock cable.

Q: Is the key interlock cable installed correctly?

YES : 

Go to Step 5.

NO : 

Install the key interlock cable correctly. 
Refer to 

P.23A-561

. When the brake pedal 

is depressed with the ignition key at the 
"LOCK" (OFF) position, check that the 
selector lever can not be moved from "P" 
position to "R" position.

STEP 5. Check the key interlock cable.

Q: Is the key interlock cable in good condition?

YES : 

No action to be taken.

NO : 

Replace the key interlock cable. Refer to 

P.23A-561

. When the brake pedal is 

depressed with the ignition key at the 
"LOCK" (OFF) position, check that the 
selector lever can not be moved from "P" 
position to "R" position.