Mitsubishi 380. Manual — part 389

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-96

STEP 12. Using diagnostic tool MB991958, check data list
item 19: Stoplamp Switch.

CAUTION

To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting diagnostic tool
MB991958.
(1) Connect diagnostic tool MB991958 to the data link

connector.

(2) Turn the ignition switch to the "ON" position.
(3) Set diagnostic tool MB991958 to the data reading mode.

• Item 19: Stoplamp Switch.

• When the brake pedal is depressed, the display on

diagnostic tool MB991958 should be "ON."

• When the brake pedal is not depressed, the display

on diagnostic tool MB991958 should be "OFF."

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the switch operating properly?

YES : It can be assumed that this malfunction may be

intermittent. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-14

NO : Repeat Troubleshooting procedure. Go to Step 1.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-97

23A

(P0705): Transmission Inhibitor Switch System (Open Circuit)

CAUTION

If (P0705) has been set, TCL related DTC (C1397)
is also set. After (P0705) has been diagnosed,
don’t forget to erase DTC (C1397).

CIRCUIT OPERATION

• Battery positive voltage is applied to the transmis-

sion inhibitor switch (terminal 8) when the ignition
switch is turned "ON."

• Battery positive voltage is applied to the A/T-ECU

connector B-22 (terminal 25) when the transmis-
sion range is in the "P" range. The A/T-ECU
judges that the transmission range is in the "P"
range when the battery positive voltage is
applied.

• Battery positive voltage is applied to the A/T-ECU

connector B-22 terminal (23, 26 and 24) when the
selector lever is in the ("R", "N," and "D," range).
The A/T-ECU judges that the selector lever is in
the ("R", "N," and "D," range) when the battery
positive voltage is applied.

DTC SET CONDITIONS

Check Conditions, Judgement Criteria

• Transmission inhibitor switch: no signal detected.

(30 seconds)

AC306223

A-13 (GR)

CONNECTOR: A-13

2 3

13 14

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS: B-19, B-22

AC210068

CONNECTOR: B-110

B-110 (B)

TRANSMISSION
RANGE SWITCH

10DB093A

CONNECTOR: D-14

FLOOR

WIRING

HARNESS

ROOF

WIRING

HARNESS

D-14

10DB084A

CONNECTORS: C-214, 215

1
3 4

2
6

C-214

C-215

1
7

1314

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-98

OBD-II DRIVE CYCLE PATTERN

Start the engine, keep the vehicle stopped in "P," "R,"
"N," and "D" ranges respectively for more than one
minute, and turn "LOCK" (OFF) the ignition switch.
Then restart the engine, and stop the vehicle in "P,"
"R," "N," and "D" ranges respectively for more than
one minute.

TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)

• Malfunction of the transmission inhibitor switch

• Malfunction of the ignition switch

• Damaged harness or connector

• Malfunction of the A/T-ECU

Circuit drawings

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• Refer to component locations GROUP-

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-99

DIAGNOSIS

Required Special Tool:

• MB991958: Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

STEP 1. Using diagnostic tool MB991958, check data list
item 34: Transmission Inhibitor Switch.

CAUTION

connector.

(2) Turn the ignition switch to "ON" position.
(3) Set diagnostic tool MB991958 to the data reading mode.

• Item 34: Transmission Inhibitor Switch.

• Move the selector lever to "P," "R," "N," "D" and sport

mode positions and confirm that the selected trans-
mission range match the positions shown on
diagnostic tool MB991958. (Sport mode is indicated
as "D" on the diagnostic tool).

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Does the diagnostic tool indication correspond to the

actual transmission range?
YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-14

NO (no correct transmission range is displayed) : Go to

Step 2.

NO (Only "P" position is not displayed correctly) : Go

to Step 6.

NO (Only "R" position is not displayed correctly) : Go