Mitsubishi Montero (1991+). Manual — part 157

FUEL GAUGE

Simple Test

Disconnect fuel sending unit connector wire in luggage

compartment, cargo space, or at tank unit. Connect a 12-volt, 3.4-watt

bulb to harness side of connector, between power terminal and ground

(Yellow and Black wires on Montero). On Pickup and Ram-50 see Fig. 1.

Turn ignition switch to ON position. Ensure test bulb flashes, or

stays on, and fuel gauge needle moves. If bulb or gauge needle does

not function as described, check and repair fuel gauge circuit.

CAUTION: Gauge coils can be damaged if wire is grounded too long.

Perform test as quickly as possible.

Fig. 1: Identifying Fuel Gauge Test Connection (Pickup & Ram-50)

Courtesy of Chrysler Motors.

NOTE: The following test must be completed with instrument panel

cluster removed. Use ohmmeter for all measurements. If

resistance is extremely low, there may be a short in the

coil. If resistance is extremely high, there may be a broken

wire or similar problem in the gauge.

Resistance Test

Remove instrument cluster. See INSTRUMENT CLUSTER under

REMOVAL & INSTALLATION. Measure resistance between appropriate

terminals of instrument cluster or combination gauges. See Fig. 2 or

Fig. 3. See FUEL GAUGE RESISTANCE SPECIFICATIONS table. If resistance

readings are not to specifications, replace fuel gauge.

FUEL GAUGE RESISTANCE SPECIFICATIONS TABLE

Application Terminals Ohms

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

" . . . . . . .. No. 2 & 3 . . . . . ... 165

" . . . . . . .. No. 1 & 3 . . . . . ... 110

Pickup & Ram-50 . . .. IGN & ground. . . . . ... 62-78

" . . . . . . ... 7V & FU . . . . . .. 49-61

Fig. 2: Fuel Gauge Resistance Check Terminal ID (Montero)

Courtesy of Mitsubishi Motor Sales of America.

Fig. 3: Fuel Gauge Resistance Check Terminal ID (Pickup & Ram-50)

Courtesy of Mitsubishi Motor Sales of America.

OIL PRESSURE GAUGE

Circuit Test

Disconnect oil pressure gauge wiring connector from sending

unit inside the engine compartment. Connect a 12-volt test light

between harness connector terminal and ground. Turn ignition on, but

DO NOT start engine. If test light comes on and gauge needle moves, go

to GAUGE RESISTANCE TEST. If test light does not come on and gauge

needle does not move, repair wiring to sending unit.

Gauge Resistance Test

Remove instrument cluster from instrument panel. See

INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Check continuity

between oil pressure gauge terminals. See Fig. 4 or Fig. 5. See

OIL PRESSURE GAUGE RESISTANCE SPECIFICATIONS table. If resistance is

not within specification, replace oil pressure gauge.

OIL PRESSURE GAUGE RESISTANCE SPECIFICATIONS TABLE

Application Ohms

Montero . . . . . . . . . .. 50

Pickup & Ram-50 . . . . . . ... 37-47

Fig. 4: Oil Pressure Gauge Test Terminal ID (Pickup & Ram-50)

Courtesy of Chrysler Motors

Fig. 5: Oil Pressure Gauge Test Terminal ID (Montero)

Courtesy of Chrysler Motors

REED SWITCH

Continuity Check (Except Pickup & Ram-50)

Remove instrument cluster. See INSTRUMENT CLUSTER under

REMOVAL & INSTALLATION. Check continuity between reed switch terminals

No. 1 and 2. See Fig. 6. Ensure continuity pulses on and off 4 times

per revolution of speedometer shaft connection. If continuity is not

as specified, replace reed switch.

Fig. 6: Identifying Reed Switch Test Terminals (Montero)

Courtesy of Mitsubishi Motor Sales of America.

SPEEDOMETER