Isuzu engine C22NE / 22LE / 20LE. Manual - part 112

DRIVEABILITY AND EMISSIONS  6E1-277

EMISSIONS

CATALYTIC CONVERTER
(IF APPLICABLE)

Refer to Engine Exhaust.

AIR CONDITIONING RELAY

Removal

1.  Remove the fuse and relay box cover at right side of

engine room.

2.  Refer to the diagram on the cover to determine which is

the correct relay.

3.  Insert small screwdriver or use thumb pressure to

release the retainer of the relay.

4.  Pull the relay straight up and out of the fuse and relay

box.

Installation

1.  Insert the relay into the correct place in the fuse and relay

box with the catch slot aligned to retainer.

2.  Press down until the catch of retainer engages.

3.  Install fuse and relay box cover.

IGNITION TIMING ADJUSTMENT

There is no timing adjustment. The timing signal is furnished by
the CKP, ECM control the ignition timing.

EVAP CANISTER HOSES
(IF APPLICABLE)

To see the routing of the EVAP canister hoses, refer to
Emission Control System schematics.

6E1-278  DRIVEABILITY AND EMISSIONS

EVAP CANISTER (IF APPLICABLE)

Removal

1.  Disconnect all hoses.

2.  Remove EVAP canister.

Inspection

1.  Inspect the hoses for cracks, damage and leaks.

2.  Inspect the canister for damages.

Installation

1.

Install EVAP canister.

2.  Connect all hoses and secure them with clamps.

EVAP CANISTER PURGE VALVE
SOLENOID (IF APPLICABLE)

Removal

1.  Disconnect the negative battery cable.

2.  Disconnect al connector from EVAP purge solenoid

located on the intake manifold.

3.  Disconnect the vacuum hoses from the solenoid.

4.  Slide EVAP purge solenoid out from the bracket.

Installation

1.  Insert EVAP purge solenoid valve onto the bracket.

2.  Install the bracket on the intake manifold.

3.  Connect vacuum hoses and al connector at the purge

valve.

DRIVEABILITY AND EMISSIONS  6E1-279

WIRING AND CONNECTORS

WIRING HARNESS SERVICE

The control module harness electrically connects the control
module to the various solenoids, switches and sensors in the
vehicle engine compartment and passenger compartment.
Replace wire harnesses with the proper part number
replacement.
Because of the low amperage and voltage levels utilized in
electric control systems, it is essential that all wiring in
environmentally exposed areas be repaired with crimp and seal
splice sleeves.
The following wire harness repair information is intended as a
general guideline only. Refer to Chassis Electrical for all wire
harness repair procedures.

ECM CONNECTORS AND
TERMINALS

Removal

1.  Remove the connector terminal retainer.

2.  Push the wire connected to the affected terminal through

the connector face so that the terminal is exposed.

3.  Service the terminal as necessary.

Installation

1.  Bend the tab on the connector to allow the terminal to be

pulled into position within the connector.

2.  Pull carefully on the wire to install the connector terminal

retainer.

CONNECTORS AND TERMINALS

Use care when probing a connector and when replacing
terminals. It is possible to short between opposite terminals.
Damage to components could result. Always use jumper wires
between connectors for circuit checking. NEVER probe
through Weather-Pack seals. Use an appropriate connector
test adapter kit which contains an assortment of flexible
connectors used to probe terminals during diagnosis. Use an
appropriate fuse remover and test tool for removing a fuse and
to adapt the fuse holder to a meter for diagnosis.
Open circuits are often difficult to locate by sight because
oxidation or terminal misalignment are hidden by the
connectors. Merely wiggling a connector on a sensor, or in the
wiring harness, may temporarily correct the open circuit.
Intermittent problems may also be caused by oxidized or loose
connections.
Be certain of the type of connector/terminal before making any
connector or terminal repair. Weather-Pack and Com-Pack III
terminals look similar, but are serviced differently.

6E1-280  DRIVEABILITY AND EMISSIONS

WIRE HARNESS REPAIR: TWISTED
SHIELDED CABLE

Removal

1.  Remove the outer jacket.

2.  Unwrap the aluminum/mylar tape. Do not remove the

mylar.

3.  Untwist the conductors.

4.  Strip the insulation as necessary.

Installation

1.  Splice the wires using splice clips and rosin core solder.

2.  Wrap each splice to insulate.

3.

Wrap the splice with mylar and with the drain
(uninsulated) wire.

4.  Tape over the whole bundle to secure.