Mitsubishi Montero (1991+). Manual — part 219

Fig. 2: Diagnostic Fault Chart (2 of 2)

Courtesy of Mitsubishi Motor Sales of America.

DIAGNOSTIC PROCEDURE (USING DRB-II)

DRB-II PROCEDURE

NOTE: When using diagnostic code charts, DO NOT skip any steps in

chart or incorrect diagnosis may result. Always check related

Technical Service Bulletins (TSB’s).

Refer to ENTERING ON-BOARD DIAGNOSTICS (USING DRB-II) to

retrieve fault codes. If fault codes are NOT present and/or DRB-II is

used, proceed to one of the following tests:

* Go to NO START TEST 1 (NS-1) chart if a no-start condition

exists or engine stalls after start-up. Perform indicated

VERIFICATION PROCEDURE chart after repairs. Ensure charts

apply to engine being tested.

* Go to DRIVEABILITY TEST 1 (DR-1) chart if engine runs but has

performance problems. Perform indicated VERIFICATION

PROCEDURE chart after repairs. Ensure charts apply to engine

being tested.

DRB-II KEY FUNCTIONS

* YES or Down Arrow & NO or Up Arrow

Keys will move lines on screen up or down allowing you to

choose an item or scroll through all selections

available.

* F1 & F2 Keys

Keys are used to scroll through sensor displays.

* ATM Key

Key will return you to previous screen.

* ENTER Key

Allows you to select a test or display. The flashing

arrow must be on the display you wish to select. Pressing

ENTER in the sensor state will cause display to change

from a 3-line display to a 1-line display.

* F3 Key

Key is used to display a help screen. This key may be

used at any time.

* Number Keys

Keys are used for choosing a display or test by the

number for the test or display.

* READ/HOLD Key

Key is used to freeze any sensor display.

* MODE & ATM Key

Pressing MODE and ATM key at the same time will cause

DRB-II to reset to copyright screen.

ENTERING ON-BOARD DIAGNOSTICS (USING DRB-II)

* PLEASE READ THIS FIRST *

1) Before entering on-board diagnostics, refer to PRETEST

INSPECTION in this article. Turn ignition off. Locate self-diagnostic

connector. See SELF-DIAGNOSTIC TEST CONNECTOR LOCATION table in this

article. Using appropriate Mitsubishi cartridge and adapter, connect

DRB-II to diagnostic connector.

2) Ensure all accessories are off. Turn ignition on. All

character positions will illuminate and copyright information will

appear on screen for a few seconds.

3) If DRB-II screen displays an error message, refer to DRB-

II ERROR SCREENS in this article. The DRB-II will offer 4 menus:

VEHICLES TESTED, HOW TO USE, CONFIGURE and SELECT VEHICLE.

VEHICLES TESTED

Press "1" key or ENTER key when VEHICLES TESTED appears on

DRB-II. DRB-II shows models covered by cartridge. Screen will display

for 5 seconds and return to DRB-II menu. To return to DRB-II menu

sooner, press ATM key.

HOW TO USE

Press "2" key or press down arrow to display HOW TO USE

option and press ENTER. Press and hold F3 key. DRB-II displays

instructions for cartridge usage. To return to DRB-II menu, press ATM

key.

CONFIGURE

Press "3" key or press down arrow to display CONFIGURE option

and press ENTER. Configure allows user to customize DRB-II display.

For example, If metric system is more useful, select METRIC from the

menu. All selections in CONFIGURE option remain active until user

changes selection.

SELECT VEHICLE

1) This allows the user to enter information about vehicle

being tested. Usually, this option has more than one display screen.

Use ENTER key to enter vehicle information.

2) When all information about vehicle is entered, DRB-II will

display an information summary the technician has entered. DRB-II will

show an additional option marked CONFIRM. If information is correct,

press CONFIRM. DRB-II will display MAIN MENU.

MAIN MENU

The MAIN MENU represents all diagnostic functions available.

Functions are SYSTEM TESTS, READ FAULTS, STATE DISPLAYS, ACTUATOR

TESTS and ADJUSTMENTS. SYSTEM TESTS is NOT available.

READ FAULTS

This allows technician to read fault codes stored in ECU

memory.

STATE DISPLAYS

1) This allows technician to view conditions at signal level.

The 2 types of signals are analog and digital. Analog signals are

monitored at pins corresponding to vehicle harness splices (e.g. fuel

pump relay).

2) Digital signals correspond to data transmitted by the

system controllers. Both signals are displayed in common units (e.g.

temperature). Use up and down arrow keys on DRB-II to scroll through

displays available.

3) The following ENGINE state displays are available on DRB-

II:

* Module Information - This mode allows technician to read ECU

part number and application.

* Engine Sensors - This mode allows technician to look at

various engine sensors during engine operation.

* Inputs/Outputs - This mode allows technician to read input

and output states of various switches and sensors.

* Custom Display - This screen allows technician to set up

his/her own custom display. Two custom display screens can be

programmed into DRB-II.

* Minimum/Current/Maximum - The MIN/CURRENT/MAX display shows a

history of conditions for a specific sensor. When this option

is selected, maximum, current (static) and minimum values can

be displayed for a specific sensor. To reset sensors to a

zero value, simply press ENTER key. This display may be used

to isolate intermittent faults. The MIN/CURRENT/MAX display

allows technician to observe operation of 6 different sensor

values. Information is displayed as a 3-digit number. The

first value displayed is the minimum reading, the second

number is the current reading and third valve is the maximum

reading. Typically sensors range between 2-252. Values less

than 2 or greater than 252 will usually indicate that a

sensor is shorted or disconnected. Watch minimum and maximum

values to help diagnose intermittent problems.

* Monitors - This screen shows technician sensors and system

controllers which affect fuel control, spark advance, RPM and

A/C relay. There are 4 different screens available. As an

example, screen No. 1 will show: airflow sensor, O2 sensor,

battery and fuel injector. All of these inputs affect fuel

control.

Actuator Tests

This mode allows technician to actuate injectors, fuel pump,

purge control, EGR solenoid, fuel pressure solenoid and wastegate.

Adjustments

This option provides a means for erasing fault code

information stored in ECU. Follow DRB-II instructions to accomplish

this task.

DRB-II ERROR SCREENS

ERROR SCREENS

SYSTEM FAULT ROM CHECK SUM XXXX Message

Cartridge or DRB-II failure.

SYSTEM FAULT KEYBOARD FAILURE Message

Restart DRB-II. Ensure DRB-II keys are not pressed during

power up. Another possibility is DRB-II failure.

SYSTEM FAULT ROM FAILURE XXXX

DRB-II failure.

SYSTEM FAULT EEPROM FAILURE

DRB-II failure.

SYSTEM FAILURE, COMMUNICATION FAILURE, REFER TO DIAGNOSTIC

PROCEDURES Message

Perform diagnostic connector test. See DRIVEABILITY TEST No.

8 (DR-8). Failure of Mitsubishi Motor Corporation (MMC) adapter is

another possibility.

SYSTEM FAILURE NO RESPONSE FROM ADAPTER or SYSTEM FAILURE

ADAPTER REQUIRED TO DIAGNOSE WITH THIS CARTRIDGE Message

Ensure you are using a correct Mitsubishi Motor Corporation

cartridge. Failure of MMC adapter is another possibility.

Fig. 3: 10-Way ECU Connector

Courtesy of Chrysler Motors.