Lexus RX300 (MCU15). Manual — part 328

DI–544

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DIAGNOSTICS

COMBINATION METER SYSTEM

LEXUS RX300 (RM785E)

Fuel gauge

INSPECTION PROCEDURE

HINT:
If there is not the hand–held tester, begin with STEP 2.

1

Perform active test.

PREPARATION:
Connect the hand–held tester to the DLC3.
CHECK:
(a)

Enter into ACTIVE TEST function of hand–held tester.

(b)

Check that the probe moves as hand–held tester directs in each range.

OK:
The gauge operates normally.

OK

Replace A/C and combination meter intagrated
ECU.

NG

2

Check fuel sender gauge (See page BE–68).

NG

Replace fuel sender gauge.

OK

3

Check for short circuit (B+) in harness and connector between A/C and combina-
tion meter integrated ECU and fuel sender gauge (see page IN–32).

NG

Repair or replace harness or connector.

OK

DI1RD–04

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DIAGNOSTICS

COMBINATION METER SYSTEM

DI–545

LEXUS RX300 (RM785E)

4

Check fuel receiver gauge (See page BE–68).

NG

Replace fuel receiver gauge.

OK

Check and replace combination meter circuit
plate.

DI–546

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DIAGNOSTICS

COMBINATION METER SYSTEM

LEXUS RX300 (RM785E)

Engine Coolant Temperature Gauge

INSPECTION PROCEDURE

HINT:
If there is not the hand–held tester, begin with STEP 2.

1

Perform active test.

PREPARATION:
Connect the hand–held tester to the DLC3.
CHECK:
(a)

Enter into ACTIVE TEST function of hand–held tester.

(b)

Check that the probe moves as hand–held tester directs in each range.

OK:
The gauge operates normally.

OK

Replace A/C and combination meter intagrated
ECU.

NG

2

Is any of DTC P0115/22 or P0116/22 output from engin?

Check DTC on page DI–3.

YES

Repair circuit indicated by output code.

NO

3

Check engine coolant temperature receiver gauge (See page BE–68).

NG

Replace engine coolant temperature receiver
gauge.

OK

Check and replace combination meter circuit
plate.

DI1RE–04

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DIAGNOSTICS

COMBINATION METER SYSTEM

DI–547

LEXUS RX300 (RM785E)

Igniter Signal Circuit

INSPECTION PROCEDURE
When using hand–held tester:

1

Check tachometer value.

PREPARATION:
Connect the hand–held tester to the DLC3.
CHECK:
(a)

Enter into DATALIST function of hand–held tester.

(b)

When driving the vehicle, check that patameter value of ”Tachometer” changes on the screen of the
hand–held tester.

OK

Replace combination meter
(See page IN–32).

NG

2

Check harness and connector between combination meter and Engine & ECT
ECU (See page IN–32).

NG

Repair or replace harness or connector.

OK

Check and repair ignition coil and wire har-
ness.

DI1RG–04