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Mitsubishi Montero (1998+). Manual - part 36

than 0.5 volt or more than 4.5 volts, or an open or short

circuit in "G" sensor system.

1) Disconnect "G" sensor connector. Sensor is located on

bracket under center console, next to shifter. See Fig. 10. Connect

Special Tool (MB991348) between sensor and connector. Using a DVOM,

check voltage between sensor connector terminals No. 2 (Blue/White

wire) and No. 3 (Black/Red wire). Voltage should be 2.38-2.62 volts.

If voltage is as specified, reconnect sensor connector and go to step

3). If voltage is not as specified, leave special tool and DVOM

connected and go to next step.

2) Note top center position of sensor, and remove sensor. See

"G" SENSOR under REMOVAL & INSTALLATION. Secure sensor so that arrow

on sensor is facing straight down. Voltage should be 3.4-3.6 volts. If

voltage is specified, reinstall sensor and go to next step. If voltage

is not as specified, replace sensor.

3) Turn ignition off. Disconnect ECU 26-pin connector. Turn

ignition on. Check voltage between ECU 26-pin connector terminals No.

4 and 17. See Figs. 5-6. Voltage should be 2.4-2.6 volts. If voltage

is as specified, go to next step. If voltage is not as specified,

check and repair connectors and related wiring harness between ECU and

sensor. See WIRING DIAGRAMS.

4) Check and repair ECU 26-pin connector. If connector is

okay, replace ECU.

Fig. 10: Locating "G" Sensor

Courtesy of Mitsubishi Motor Sales of America.

DTC 33: STOPLIGHT SWITCH SYSTEM

NOTE: DTC is set if ECU detects stoplight switch stays on for 15

minutes or more, or an open circuit in stoplight switch

system.

1) Check if stoplights are functioning correctly. If

stoplights function correctly, go to next step. If stoplights do not

function correctly, check and repair stoplight circuit. See

WIRING DIAGRAMS.

2) Turn ignition off. Disconnect ECU 22-pin connector. Using

DVOM, measure voltage between ECU 22-pin connector terminal No. 34 and

ground while depressing brake pedal. See Figs. 5-6. If battery voltage

is present, go to next step. If battery voltage is not present, check

and repair connectors and related wiring harness between stoplight

switch and ECU. See WIRING DIAGRAMS.

3) Check and repair ECU 22-pin connector. If connector is

okay, replace ECU.

DTC 41, 42 OR 43: SOLENOID VALVE CIRCUIT

NOTE: DTC sets if ECU senses that solenoid is on with no power

supplied, or off with power supplied.

1) Disconnect hydraulic unit connectors. Using ohmmeter,

check resistance between hydraulic unit connectors terminals No. 4 and

12, 5 and 12, and 6 and 12. See Fig. 11. Resistance should be 4.04-4.

54 ohms. If resistance is as specified, go to next step. If resistance

is not as specified, replace faulty hydraulic unit. See HYDRAULIC UNIT

under REMOVAL & INSTALLATION.

2) Check resistance between hydraulic unit connectors

terminals No. 1 and 12, 2 and 12, and 3 and 12. Resistance should be

8.04-8.59 ohms. If resistance is as specified, go to next step. If

resistance is not as specified, replace faulty hydraulic unit. See

HYDRAULIC UNIT under REMOVAL & INSTALLATION.

3) Turn ignition off. Disconnect ECU connectors. Check

continuity of each circuit between ECU connectors and hydraulic unit

connectors. See WIRING DIAGRAMS. If continuity exists, go to next

step. If continuity does not exist, check and repair connectors and

related wiring harness between ECU and hydraulic unit. See

WIRING DIAGRAMS.

4) Check continuity between hydraulic unit connector terminal

No. 12 and ABS relay box terminal No. 1. See Figs. 4 and 11. If

continuity exists, go to next step. If continuity does not exist,

check and repair connectors and related wiring harness between

hydraulic unit and ABS relay box. See WIRING DIAGRAMS.

5) Check and repair ECU connectors. If connectors are okay,

replace ECU.

Fig. 11: Identifying Hydraulic Unit Connector Terminals

Courtesy of Mitsubishi Motor Sales of America.

DTC 51: VALVE RELAY

NOTE: DTC is set if valve relay is removed or if no power is

supplied to relay.

1) Inspect ABS relay box. See Fig. 3. Replace ABS relay box

if needed. If ABS relay box is okay, go to next step.

2) Disconnect ABS relay box 8-pin connector. Turn ignition

on. Using a DVOM, check voltage between ABS relay box 8-pin harness

connector terminal No. 6 and ground. See Fig. 4. If battery voltage

exists, go to next step. If battery voltage does not exist, check and

repair wiring harness between ABS valve relay and fusible link No. 1.

See WIRING DIAGRAMS.

3) Disconnect ECU connectors. Check resistance between ECU

22-pin connector terminal No. 37 and ECU 26-pin connector terminal No.

26. Resistance should be 60-120 ohms. If resistance is as specified,

go to next step. If resistance is not as specified, check and repair

connectors and related wiring harness between ABS valve relay and ECU.

See WIRING DIAGRAMS.

4) Check continuity between ECU 22-pin connector terminal No.

48 and ground. If continuity exists, go to next step. If continuity

does not exist, check and repair wiring harness between ABS valve

relay and ECU. See WIRING DIAGRAMS.

5) Check and repair ECU 22-pin connector. If connector is

okay, replace ECU.

DTC 53: MOTOR RELAY

NOTE: DTC is set when ECU detects motor relay on but motor does

not run, motor relay off but motor does not stop, or when

motor relay is faulty.

1) Using scan tool, perform hydraulic unit actuator test. If

motor is not operating, go to next step. If motor is still operating,

repair wiring harness between hydraulic unit and ECU. See

WIRING DIAGRAMS.

2) Inspect ABS relay box. See Fig. 3. Replace ABS relay box

if needed. If ABS relay box is okay, go to next step.

3) Disconnect ABS relay box 2-pin connector. Using DVOM,

check voltage between 2-pin connector terminal No. 11 and ground. See

Fig. 4. If battery voltage is present, go to next step. If battery

volt age is not present, check and repair wiring harness between ABS

motor relay and fusible link No. 1. See WIRING DIAGRAMS.

4) Turn ignition off. Disconnect ECU connectors. Check

resistance between ECU 22-pin connector terminal No. 38 and 26-pin

connector terminal No. 26. Resistance should be 26-38 ohms. If

resistance is as specified, go to next step. If resistance is not as

specified, check and repair connectors and related wiring harness

between ABS motor and ECU. See WIRING DIAGRAMS.

5) Check resistance between ECU 22-pin connector terminal No.

49 and ground. Resistance should be 0.1-0.3 ohm. If resistance is as

specified, go to next step. If resistance is not as specified, check

and repair hydraulic unit motor ground connection or wiring harness

between ECU and hydraulic unit. See WIRING DIAGRAMS.

6) Check motor operation. Momentarily apply battery voltage

to hydraulic unit connector terminal No. 11. See Fig. 11. If motor

operates, go to next step. If motor does not operate, replace

hydraulic unit.

7) Check and repair ECU 22-pin connector. If connector is

okay, replace ECU.

COMPONENT TESTS

4WD CONTROL UNIT

Remove radio and remove 4WD control unit. Disconnect control

unit harness connector. Backprobe harness connector. Check voltage

between each individual terminal and ground terminal No. 8 (Black

wire). See Figs. 12 and 13. If after all tests have been completed

system is not operating properly, substitute 4WD control unit with

known-good unit and retest.

Fig. 12: Identifying 4WD Control Unit Connector

Courtesy of Mitsubishi Motor Sales of America.

Fig. 13: 4WD Control Unit Pin Voltage Chart

Courtesy of Mitsubishi Motor Sales of America.

4WD INDICATOR SWITCHES

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