Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 874

6E–225

3.2L ENGINE DRIVEABILITY AND EMISSIONS

Removal Procedure

1. Disconnect the PSP switch pigtail from the wiring

harness.

D

The pigtail is permanently attached to the switch.

Do not attempt to remove the wires from the
sensor.

D

Have a container ready to catch the power steering
fluid that leaks out of the line when the switch is
removed.

2. Remove the PSP switch from the power steering line.

D

Plug the line to prevent excessive loss of fluid and
possible contamination of the power steering
system.

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Installation Procedure

1. Install the PSP switch in the power steering line.

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2. Connect the PSP switch pigtail to the wiring harness.
3. Check the power steering fluid level.  Refer to 

Power

Steering.

4. Start the engine.  Watch the PSP switch for signs of

fluid leakage.

Throttle Position (TP) Sensor

Removal Procedure

1. Disconnect the negative battery cable.
2. Disconnect the TPS electrical connector.
3. Remove the bolts and the TP sensor from the throttle

body.

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NOTE: Do not clean the TP sensor by soaking it in
solvent.  The sensor will be damaged as a result.

Function Check

Use a Tech 2 to check the TP sensor output voltage at
closed throttle.

D

The voltage should be under 0.85 volt.

D

If the reading is greater than 0.85 volt, check the
throttle shaft to see if it is binding.  Check that the
throttle cable is properly adjusted, also.  Refer to
Throttle Cable Adjustment.

D

If the throttle shaft is not binding and the throttle cable
is properly adjusted, install a new TP sensor.

6E–226 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Installation Procedure

1. Install the TP sensor on the throttle body with the

bolts.

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2. Connect the TP electrical connector.
3. Install the negative battery cable.

Vehicle Speed Sensor (VSS)

Removal Procedure

CAUTION: The VSS is located on the right side of
the transfer case just ahead of the rear propeller
shaft and very close to the exhaust pipes.  Be sure
that the exhaust pipes are cool enough to touch
before trying to remove the VSS.  If the pipes are hot,
you could be burned.

1. Disconnect the negative battery cable.
2. Disconnect the VSS electrical connector.

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3. Remove the bolt and the clamp securing the VSS in

place.

IMPORTANT:

Have a container ready to catch any fluid

that leaks out when the VSS is removed from the transfer
case.

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4. Remove the VSS from the transfer case by wiggling it

slightly and pulling it straight out.

Inspection Procedure

1. Inspect the electrical connector for signs of corrosion

or warping.  Replace the VSS if the electrical
connector is corroded or warped.

2. Inspect the VSS driven gear for chips, breaks, or worn

condition.  Replace the VSS if the driven gear is
chipped, broken or worn.

3. Inspect the O-ring for wear, nicks, tears, or

looseness.  Replace the O-ring if necessary.

Installation Procedure

1. Install the VSS in the transfer case with the notch for

the connector facing the rear.

6E–227

3.2L ENGINE DRIVEABILITY AND EMISSIONS

2. Secure the VSS in place with the clamp and the bolt.

Tighten

D

Tighten the bolt to 16 N·m (1.6 kg·m/12 lb ft.).

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3. Connect the VSS electrical connector.

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4. Check the transfer case oil level.  Add fluid if

necessary.

5. Connect the negative battery cable.

Air Cleaner/Air Filter

Removal Procedure

1. Loosen the clamp between the air cleaner lid and the

duct.

2. Release the four latches securing the lid to the air

cleaner housing.

3. Remove the air cleaner lid.
4. Remove the air filter element.

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5. Remove the retaining bolts and the air cleaner

housing from the vehicle.

Installation Procedure

1. Install the air cleaner housing in the vehicle with the

retaining bolts.

2. Install the air filter element in the air cleaner housing.

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3. Install the air cleaner lid on the air duct and the air

cleaner housing.

4. Tighten the clamp and secure the four latches

between the lid and the air cleaner housing.

6E–228 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Idle Air Control (IAC) Valve

Removal Procedure

1. Disconnect the negative battery cable.
2. Disconnect the IAC electrical connector.
3. Remove the bolts and the IAC valve from the throttle

body.

NOTE: Do not clean the IAC valve by soaking it in
solvent.  The valve will be damaged as a result.

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Cleaning, Inspection, and
Measurement Procedure

D

Clean the IAC valve O-ring sealing surface, pintle
valve seat and air passage.

–

Use carburetor cleaner and a parts cleaning
brush to remove carbon deposits.  Do not use a
cleaner that contains methyl ethyl ketone.  This
is an extremely strong solvent and not
necessary for this type of deposit.

–

Shiny spots on the pintle are normal and do not
indicate misalignment or a bent pintle shaft.

–

If the air passage has heavy deposits, remove
the throttle body for complete cleaning.

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D

Inspect the IAC valve O-ring for cuts, cracks, or
distortion.  Replace the O-ring if damaged.

D

In order to install a new IAC valve, measure the
distance between the tip of the pintle and the
mounting flange.  If that measurement is 28 mm (1.1
in.) or less, the valve needs no adjustment.  If the
measurement is greater than 28 mm (1.1 in.), apply
finger pressure and retract the valve.  The force
required to retract the pintle on a new valve will not
damage the valve, shaft, or pintle.

NOTE: Do not push or pull on the IAC valve pintle on IAC
valves that have been in service.  The force required to
move the pintle may damage it.

IMPORTANT:

Use an identical replacement part in

order to replace a valve.  IAC valve pintle shape and
diameter are designed for the specific application.

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