Lexus ES300 (1997 year). Manual - part 250

V08433

8

SPEEDOMETER

Replace circuit plate. Then recheck system.

COMBINATION
METER

Yes

No

Does odometer operate while driving?

Jack up the vehicle. Turn ignition switch ON.

Rotate propeller shaft. Does the voltage between

terminals C10 and ground change (approx. 0V to 5V

or more) per revolution of propeller shaft?

Disconnect connectors ”A” and ”C” from meter.
Inspect connector on wire harness side as follows.

HINT : While carrying out the following inspection, make certain that the connectors and terminals are properly con-
nected.

INSPECT ODOMETER OPERATION

See chart 18.

 ECM

HINT : While carrying out the following inspection, make certain that the connectors and terminals are properly con-
nected.

Replace circuit plate. Then recheck system.

Remove meter with connector connected.
Inspect connector ”C” from back side as follows.

Wire harness between terminal C10 of meter and*ECU

 faulty.

 Power Steering ECU

* : An electrical tester availble to measure frrequency
    is necessary for this inspection.
    REFERENCE : TOYOTA ELECTRICAL TESTER
                            (09082–00050)

 Suspension ECU

 ABS and TRAC ECU

With engine running, does voltage between terminals

A13 and C10 fluctuate?

 Cruise Control ECU

Yes

No

9

Vehicle speed signal (4P) faulty

Tachometer dose not operate while
engine running.

TACHOMETER

Yes

No

* INSPECT TACHOMETER CIRCUIT

Wire harness faulty between terminal A13 of meter
and igniter.

BE–64

–

BODY ELECTRICAL

COMBINATION METER

1448

1997 LEXUS ES300   (RM511U)

V08434

COMBINATION METER

Yes

No

Disconnect connector ”D” from meter.
Inspect connector on wire harness side as follows.

HINT : While carrying out the following inspection, make certain that the connectors and terminals are properly con-
nected.

Yes

Yes

Yes

No

No

No

Is operation normal?

Replace receiver gauge. Then recheck system.

Is there continuity (no resistance ) between terminal

D12 and ground?

Are speedometer and tachometer operating normally?

Replace combination

meter computer.

Then recheck system.

 Open circuit in wire

harness between terminal

 12 of meter and ground.

 Ground faulty.

Wire harness faulty between meter and sender gauge.

Replace sender gauge. Then recheck system.

Is operation normal?

Is resistance normal?

Replace combination meter computer.
Then recheck system.

INSPECT SENDER GAUGE OPERATION
(See page 

BE–92

)

INSPECT RECEIVER GAUGE RESISTANCE
(See page 

BE–92

)

INSPECT RECEIVER GAUGE OPERATION
(See page 

BE–92

)

FUEL GAUGE

Does not operate or operation is
abnormal.

10

Yes

No

–

BODY ELECTRICAL

COMBINATION METER

BE–65

1449

1997 LEXUS ES300   (RM511U)

V08435

Disconnect connector ”D” from meter.
Inspect connector on combination meter side as
follows.

HINT : While carrying out the following inspection, make certain that the connectors and terminals are properly con-
nected.

Yes

Replace combination
meter computer.
Then recheck system.

Yes

Yes

Yes

No

No

No

No

Yes

Is bulb OK?

INSPECT FUEL LEVEL WARNING LIGHT
(See page 

BE–92

)

Replace bulb.
Then recheck system.

Ground terminal D11 and turn ignition switch ON.
Does fuel level warning light up?

Replace circuit plate.

If operation is not as specified, replace the switch.
Then recheck system.

Wire harness faulty between terminal D11 of
meter and terminal 1 of sender gauge.

Temporarily install another circuit plate.
Is operation normal?

INSPECT FUEL LEVEL WARNING SWITCH
(See page 

BE–92

)

11

FUEL LEVEL WARNING

Warning light does not light up or always
lights up.

Is operation normal?

BE–66

–

BODY ELECTRICAL

COMBINATION METER

1450

1997 LEXUS ES300   (RM511U)

V08436

Disconnect connector ”A” from meter.
Inspect connector on wire harness side.

HINT : While carrying out the following inspection, make certain that the connectors and terminals are properly con-
nected.

Yes

No

Wire harness faulty between terminal A1 of meter
and ground.

No

No

No

No

Yes

Yes

INSPECT RECEIVER GAUGE OPERATION
(See page 

BE–92

)

Yes

Yes

INSPECT RECEIVER GAUGE RESISTANCE
(See page 

BE–92

)

Wire harness faulty between terminal A3 of meter
and sender gauge.

Sender gauge ground condition faulty.

Replace sender gauge. Then recheck system.

INSPECT SENDER GAUGE GROUND CONDITION

Is there continuity (no resistance) between gauge
body and engine block?

Is resistance normal?

Is there continuity between terminal A3 and ground?

Replace receiver gauge. Then recheck system.

Is there continuity between terminal A1 and ground?

Replace combination meter computer.
Then recheck system.

COMBINATION
METER

12

ENGINE COOLANT TEMPERATURE
GAUGE

Does not operate or operation is
abnormal.

Is operation normal?

–

BODY ELECTRICAL

COMBINATION METER

BE–67

1451

1997 LEXUS ES300   (RM511U)