Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 709

6A–17

ENGINE MECHANICAL

Fuel Consumption Excessive

Condition

Possible cause

Correction

Trouble in fuel system

Mixture too rich or too lean due to
trouble in fuel injection system

Refer to “Abnormal Combustion”

Fuel cut function does not work

Refer to “Abnormal Combustion”

Trouble in ignition system

Misfiring or abnormal combustion
due to trouble in ignition system

Refer to “Hard Start” or “Abnormal
Combustion”

Others

Engine idle speed too high

Reset Idle Air Control Valve

Fuel system leakage

Correct or replace

Clutch slipping

Correct

Brake drag

Correct

Selection of transmission gear
incorrect

Caution operator of incorrect gear
selection

Excessive Exhaust Gas
Recirculation flow due to trouble in
Exhaust Gas Recirculation system

Refer to “Abnormal Combustion”

Lubrication Problems

Condition

Possible cause

Correction

Oil pressure too low

Wrong oil in use

Replace with correct engine oil

Relief valve sticking

Replace

Oil pump not operating properly

Correct or replace

Oil pump strainer clogged

Clean or replace strainer

Oil pump worn

Replace

Oil pressure gauge defective

Correct or replace

Crankshaft bearing or connecting
rod bearing worn

Replace

Oil contamination

Wrong oil in use

Replace with correct engine oil

Oil filter clogged

Replace oil filter

Cylinder head gasket damage

Replace gasket

Burned gases leaking

Replace piston and piston rings or
cylinder body assembly

Oil not reaching valve system

Oil passage in cylinder head or
cylinder body clogged

Clean or correct

Engine Oil Pressure Check

1. Check for dirt, gasoline or water in the engine oil.

a. Check the viscosity of the oil.
b. Change the oil if the viscosity is outside the

specified standard.

c. Refer to the “Maintenance and Lubrication” section

of this manual.

2. Check the engine oil level.

The level should fall somewhere between the “ADD”
and the “FULL” marks on the oil level dipstick.
If the oil level does not reach the “ADD” mark on the
oil level dipstick, engine oil must be added.

3. Remove the oil pressure unit.

4. Install an oil pressure gauge.
5. Start the engine and allow the engine to reach normal

operating temperature (About 80

°

C).

6. Measure the oil pressure.

Oil pressure should be:

392–550 kPa (56.9–80.4  psi) at 3000 rpm.

7. Stop the engine.
8. Remove the oil pressure gauge.
9. Install the oil pressure unit.

10. Start the engine and check for leaks.

6A–18

ENGINE MECHANICAL

Malfunction Indicator Lamp

The instrument panel “CHECK ENGINE” Malfunction
Indicator Lamp (MIL) illuminates by self diagnostic
system when the system checks the starting of engine, or
senses malfunctions.

Condition

Possible cause

Correction

“CHECK ENGINE” MIL does not

Bulb defective

Replace

illuminate at the starting of engine

MIL circuit open

Correct or replace

Command signal circuit to operate
self diagnostic system shorted

Correct or replace

Engine Control Module (PCM) cable
loosely connected, disconnected or
defective

Correct or replace

PCM defective

Replace

“CHECK ENGINE” MIL illuminates,
and stays on

Deterioration of heated oxygen
sensor internal element

Replace

Heated oxygen sensor connector
terminal improper contact

Reconnect properly

Heated oxygen sensor lead wire
shorted

Correct

Heated oxygen sensor circuit open

Correct or replace

Deterioration of engine coolant
temperature sensor internal element

Replace

Engine coolant temperature sensor
connector terminal improper contact

Reconnect properly

Engine coolant temperature sensor
lead wire shorted

Correct

Engine coolant temperature sensor
circuit open

Correct or replace

Throttle position sensor open or
shorted circuits

Correct or replace

Deterioration of crankshaft position
sensor

Replace

Crankshaft position sensor circuit
open or shorted

Correct or replace

Vehicle speed sensor circuit open

Correct or replace

Manifold absolute pressure sensor
circuit open or shorted

Correct or replace

Intake air temperature sensor circuit
open or shorted

Correct or replace

Fuel injector circuit open or shorted

Correct or replace

PCM driver transistor defective

Replace PCM

Malfunctioning of PCM RAM
(Random Access Memory) or ROM
(Read Only Memory)

Replace PCM

6A–19

ENGINE MECHANICAL

Cylinder Head Cover LH

Removal

1. Disconnect battery ground cable.
2. Remove engine cover from the dowels on the

common chamber.

F06RY001

3. Disconnect positive crankcase ventilation hose.
4. Remove ground cable fixing bolt on cylinder head

cover.

5. Ignition coil connector and ignition coil.

D

Disconnect the three connectors from the ignition
coils.

D

Remove harness bracket bolt on cylinder head
cover.

D

Remove fixing bolts on ignition coils.

060R200199

Legend

(1) Ignition Coil Connector
(2) Bolt
(3) Ignition Coil Assemblies

6. Disconnect fuel injector harness connector then

remove fuel injector harness bracket bolt.

7. Remove eight fixing bolts, then the cylinder head

cover.

010R200001

6A–20

ENGINE MECHANICAL

Installation

1. Install cylinder head cover.

D

Clean the sealing surface of cylinder head and
cylinder head cover to remove oil and sealing
materials completely.

D

Apply sealant (TB-1207B or equivalent) of bead
diameter 2-3 mm at eight place of arched area of
camshaft bearing cap on front and rear sides.

D

The cylinder head cover must be installed with in 5
minutes after sealant application to prevent
hardning of sealant.

D

Tighten bolts to the specified torque.

Torque : 9 N·m (78 lb in)

010R200002

2. Install fuel injection harness bracket and tighten bolt

to the specified torque.

Torque : 9 N·m (78 lb in)

3. Connect ignition coil connector and ignition coil, then

tighten bolt to the specified torque.

Torque : 4 N·m (35 lb in)

060R200199

Legend

(1) Ignition Coil Connector
(2) Bolt
(3) Ignition Coil Assembly

CAUTION: Ignition coil assembly #6 is different
from ignition coil assembly from #1 to #5. Ignition
coil assembly #6 is short type. So, note it when
installing ignition coil assembly of #6.

060RY00002

Legend

(1) Long Type Ignition Coil Assemblies (# 1 

∼

 # 5)

(2) Short Type Ignition Coil Assembly (# 6)

4. Connect ground cable and tighten bolts to the

specified torque.

Torque : 9 N·m (78 lb in)

5. Install positive crankcase ventilation hose.
6. Install engine cover mating with the dowels.