Isuzu engine C22NE / 22LE / 20LE. Manual - part 106

DRIVEABILITY AND EMISSIONS  6E1-253

Notice: To prevent possible Electrostatic Discharge damage,
follow these guidelines:

•

Do not touch the control module connector pins or
soldered components on the control module circuit board.

•

Do not open the replacement part package until the part
is ready to be installed.

•

Before removing the parts from the package, ground the
package to a known good ground on the vehicle.

•

If the parts been handled while sliding across the seat, or
while sitting from standing position, or walking a distance,
touch a known good ground before installing the parts.

Notice: To prevent internal ECM damage, the ignition must be
OFF position in order to disconnect or reconnect power to the
ECM (for example: battery cable, pig-tail, ECM fuse, jumper
cable, etc.).

ENGINE CONTROL MODULE (ECM)

Removal

1.  The ECM cover is located at the Instrument panel lower

center cover assembly.

2.  Remove the center cover assembly.

3.  Remove the three screws.

4.  Pull out the ECM.

5.  Disconnect both red and tan connectors.

6.

Remove the four screws located on both sides and then
remove the brackets from the ECM.

Installation

1.  Attach the brackets to both sides of the ECM main body

by securely tightening the screws.

6E1-254  DRIVEABILITY AND EMISSIONS

2.

Connect both red and tan connectors.

3.

Replace the ECM to the original position by tightening the
screws.

4.  Attach the center cover assembly.

POWER STEERING PRESSURE
(PSP) SWITCH

Removal

1.  Disconnect the battery negative cable.

2.  Disconnect the PSP switch pigtail from the wiring

harness.

Important: The pigtail is permanently attached to the switch.
Do not attempt to remove the wire from the switch.
Important: Have container ready to catch the power steering
fluid that leaks out of the line when the switch is removed.

3.  Unscrew the PSP switch from the power steering pump.

Installation

1.  Install the PSP switch into the power steering pump.

2.  Connect electrical connector.

3.  Ensure power steering fluid level and no leakage. Add

power steering fluid if necessary. Refer to Power Steering
Section.

4.  Connect the negative battery cable.

DRIVEABILITY AND EMISSIONS  6E1-255

THROTTLE POSITION SENSOR
(TPS)

Removal

1.  Disconnect the negative battery cable.

2.  Disconnect the TPS electrical connector.

3.  Remove the two screws and TP sensor from the throttle

body.

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

Function Check

Use a Scan Tool to check the TP sensor output voltage at
closed throttle.

•

The voltage should be under 0.25 volts.

•

If the reading is greater than 0.25 volts, check the throttle
shaft to see if it is binding. Check that the throttle cable is
properly adjusted, also. Refer to Throttle Cable
Adjustment.

•

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

Installation

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

2.  Connect the electrical connector.

3.  Connect the negative battery cable.

VEHICLE SPEED SENSOR (VSS)

Removal

1.  Disconnect the negative battery cable.

2.  VSS is located on the right side of the transmission case

just ahead of the rear propeller shaft. Disconnect the
VSS electrical connector.

3.  Remove the bolt and the VSS from the transmission case

by wiggling it slightly and pulling it straight out.

Important: Have a container ready to catch any fluid that leaks
out when the VSS is removed from the transfer case.

6E1-256  DRIVEABILITY AND EMISSIONS

Inspection

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

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

the connector facing the rear.

2.  Secure the VSS with mounting bolt. Tighten the bolt to 16

N

⋅m (17kgf⋅m).

3.  Connect electrical connector to the VSS.

4.

Check the transmission oil level. Add oil if necessary.

5.  Connect the negative battery cable.