Mitsubishi Montero (1991+). Manual — part 158

Calibration Test

Adjust tire pressure to standard value. Using a calibrated,

reliable speedometer tester, compare reading of vehicle speedometer to

speedometer tester. See SPEEDOMETER ALLOWABLE VARIATION table. Replace

speedometer if necessary.

SPEEDOMETER ALLOWABLE VARIATION TABLE

MPH (km/h) Allowable Variation MPH (km/h)

20 (32) . . . . . . .. 19-22 (31-35)

40 (64) . . . . . . .. 38-44 (61-71)

60 (97) . . . . . . . 57-66 (92-106)

80 (129) . . . . . ... 76-88 (122-142)

100 (161) . . . . . . 94-110 (151-177)

TACHOMETER

NOTE: DO NOT reverse polarity when installing tachometer, as diode

and transistor may be damaged.

Calibration Test

Connect a calibrated, reliable tach-dwell meter to vehicle

ignition system. Operate engine at various speeds (RPM). See

TACHOMETER ALLOWABLE VARIATION table. If comparison between tach-dwell

meter and vehicle tachometer readings do not fall in the standard

range of permissible variation, replace vehicle tachometer.

TACHOMETER ALLOWABLE VARIATION TABLE

Engine Speed (RPM) Allowable Variation (RPM)

1000 . . . . . . . . .. 900-1100

3000 . . . . . . . . . 2850-3150

5000 . . . . . . . . . 4750-5250

6000 . . . . . . . . . 5700-6300

TEMPERATURE GAUGE

CAUTION: DO NOT connect sender wire directly to ground during test.

Circuit Test

Disconnect temperature sender wire from sending unit. Connect

a 12-volt, 3.4-watt test bulb between connector terminal and ground.

Turn ignition switch to ON position. If test bulb flashes and

temperature gauge needle moves, go to SENSOR RESISTANCE TEST. If test

light does not flash and gauge needle does not move, repair wiring to

sending unit.

Sensor Resistance Test

Remove thermosensor (sending unit) from engine block. Place

sending unit in hot water of 158

F (70

C) temperature. Check sensor

resistance with an ohmmeter. Thermosensor resistance should be 90-117

ohms at 158

F (70

C). If thermosensor resistance in okay, go to GAUGE

RESISTANCE TEST. Replace thermosensor if resistance is not as

specified.

Gauge Resistance Test

Remove instrument cluster from instrument panel. See

INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Measure resistance

between temperature gauge terminals at rear of cluster or combination

gauges. See TEMPERATURE GAUGE RESISTANCE SPECIFICATIONS table. See

Fig. 7 or Fig. 8.

Fig. 7: Temperature Gauge Test Terminals (Montero)

Courtesy of Mitsubishi Motor Sales of America.

Fig. 8: Temperature Gauge Test Terminal ID (Pickup & Ram-50)

Courtesy of Mitsubishi Motor Sales of America.

TEMPERATURE GAUGE RESISTANCE SPECIFICATIONS TABLE

Application Terminals Ohms

Montero . . . ... No. 1 & 2 . . . 55

Pickup & Ram-50 . . 7V & TU . ... 49-61

VOLTMETER

Resistance Test (Montero)

Using an ohmmeter, measure resistance between voltmeter

terminals. See Fig. 9. Resistance should be 380-460 ohms.

Fig. 9: Identifying Voltmeter Resistance Test Terminals (Montero)

Courtesy of Mitsubishi Motor Sales of America.

Voltage Test (Pickup & Ram-50)

Using a voltmeter, connect positive lead to terminal No. 7 of

fuse box, and ground negative terminal. Crank engine and compare

readings of vehicle voltmeter to testing voltmeter. Voltage variation

should not exceed 0.5 volt (plus or minus). Replace voltmeter if

voltage reading is not as specified.

REMOVAL & INSTALLATION

INSTRUMENT CLUSTER

Removal & Installation (Montero)

1) Remove instrument cluster cover. Remove screws from bottom

of instrument cluster. Remove bolt from upper part of cluster.

2) Disconnect speedometer cable from back of instrument

cluster by pushing stopper of plug on speedometer cable side of

connection. Pull cluster out part way. Disconnect all connectors

attaching cluster. Remove cluster. See Fig. 10. To install, reverse

removal procedure.

Fig. 10: Identifying Instrument Cluster Components (Montero)

Courtesy of Mitsubishi Motor Sales of America.

Removal & Installation (Pickup & Ram-50)

1) Disconnect negative battery cable. Remove heater fan