Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 613

ENGINE ELECTRICAL 6D – 59

INSPECTION AND REPAIR

Make necessary correction or parts replacement if wear,
damage or any other abnormal conditions are found
through inspection.

Engine Warming Up Switch

1. Inspect the switch continuity by following table.

Terminal

SW position

OFF

2. Make sure the indicator light turns on, when the engine

warming up switch is “ON” with engine running.

Thermo Switch/Ambient Temp. Switch

1.  Submerge end of switch in water.
2.  Connect circuit tester to the connector terminals.
3.  Use a burner to heat the water.
4.  Check the continuity test across.
Operating temperature

Thermo

Ambient

temp.

OFF

→ ON

°C or less

→ OFF

About 80

°C About

°C

Accel Switch

Half accel switch (only 4JA1T)

1. Connect a circuit tester to the connector terminals.
2. Check the Continuity test across.

Operating

Position

Free Push

Accel switch

Continuity

Not continuity

Half accel switch Not continuity

Continuity

6D – 60 ENGINE ELECTRICAL

Vacuum switch valve (VSV)

Use a circuit tester to measure the V.S.V. resistance.
V.S.V. Resistance

at 20

°C

Approx. 40

Ω

If the resistance is not within specification replace it.

Vacuum Control Valve

Check the control valve operating pressure.
1. Make sure that port (X) is open to the atmosphere (no

obstructions).

2. Apply a constant pressure of

− 500 mmHg to port (Z).

3. Apply a pressure of

− 155 mmHg to port (S).

Measure the valve operating pressure at port (Y).

Valve Operating Pressure

mmHg

Standard reading

0 to

− 100

4. Apply a pressure of

− 75 mmHg to port (S).

Measure the valve operating pressure at port (Y).

Valve Operating Pressure

mmHg

Standard reading

− 400 to − 500

Vacuum Regulator Valve

Check the vacuum regulator valve operating pressure.
1. Apply a pressure of

− 450 mmHg (− 17.7 Hg) to port

(S).
Measure the regulator pressure at port (Z).

Regulator Operating Pressure

mmHg (Hg)

Standard reading

− 235 to − 265 (− 9.3 to − 10.4)

ENGINE ELECTRICAL 6D – 61

Half Accel. Switch Adjustment (only 4JA1T)

1. Insert a feeler gauge of 6 mm thickness between the

idle adjust screw end and control lever (A).

2. Loosen each bolts (

& ).

3. Set the circuit tester to micro-switch harness.
4. Find out the just continuity from OFF to ON position

with moving the micro-switch in the direction of the
arrow.

5. Tigten each bolts (

& ).

Half Accel. Switch (on the vehicle)

Inspection

1. Connect a circuit tester to the half accel. switch

connector terminals.

2. Operate control lever slowly to a point where continuity

is switched over from “ON” to “OFF”. Then measure
the clearance between the idle stopper bolt (A) and
control lever (B).

Standard clearance mm (in)

5.0 - 7.8 (0.2 - 0.3)

If the clearance is out of the range, the switch must be
adjusted.

Adjustment

1. Insert a feeler gauge of specified thickness between

the idle stopper bolt (A) and control lever (B).

Adjustment clearance mm (in)

5.0 (0.2)

2. Loosen two switch bolts.
3. Connect a circuit tester to the switch connector

terminals.

4. Moving the switch in directions indicated by arrows.

Check to make sure of the point where continuity is
cut.

5. Tighten the two bolts

& .

6D – 62 ENGINE ELECTRICAL

MEMO

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