Toyota 1HZ Repair Manual

FU-7
FUEL SYSTEM - Fuel Heater System
Vacuum Switch
1. INSPECT SWITCH CONTINUITY
Using an ohmmeter, check that there is no continuity
between terminal 1 and the switch body.
If continuity is not as specified, replace the fuel heater and
vacuum switch assembly.
2. INSPECT SWITCH OPERATION
(a) Apply a vacuum of 350 ± 50 mmHg (13.78 ± 1.97
in.Hg, 46.7 ± 86.7 kPa) or more to the vacuum switch
port.
(b) Using an ohmmeter, check that there is continuity
between terminal 1 and the switch body.
If operation is not as specified, replace the fuel heater and
vacuum switch assembly.
INSPECTION OF COMPONENTS
Fuel Heater
INSPECT FUEL HEATER
(a) Apply a vacuum of 350 ± 50 mmHg (13.78 ± 1.97
in.Hg, 46.7 ± 6.7 kPa) or more to the vacuum switch
port.
(b) Using an ohmmeter, measure the resistance between
terminal 1 and the switch body.
Resistance: 0.5-2.0 Q at 20°C (68°F)
If the resistance is not as specified, replace the fuel heater
and vacuum switch assembly.

Toyota 1HZ Specifications

General

Fuel Type	Diesel
Maximum Power	96 kW (129 hp) at 3800 rpm
Firing Order	1-5-3-6-2-4
Aspiration	Naturally aspirated
Fuel System	Direct injection
Cooling System	Water-cooled
Displacement	4.2 L (4164 cc)
Maximum Torque	285 N·m (210 lb·ft) at 2200 rpm
Valvetrain	SOHC, 12 valves (2 per cylinder)