2007 ISUZU KB P190 Workshop Repair Manual

fuel tank removal width brake pads fuel tank capacity inflation pressure alarm

Page 2001 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE DIAGNOSIS (C24SE) 6-1
SECTION 6
ENGINE DIAGNOSIS
TABLE OF CONTENTS
PAGE
Engine Diagnosis ...................................................................................................

ENGINE DIAGNOSIS (C24SE) 6-1
SECTION 6
ENGINE DIAGNOSIS
TABLE OF CONTENTS
PAGE
Engine Diagnosis .............................................................................................................. 6- 2
Hard Starting ................................................................................................................. 6- 2
Engine Compression Test Procedure ......................................................................... 6- 3
Rough Engine Idling or Engine Stalling...................................................................... 6- 4
Rough Engine Running ................................................................................................ 6- 5
Hesitation ..................................................................................................................... . 6- 6
Engine Lacks Power ..................................................................................................... 6- 7
Engine Noisy ................................................................................................................. 6 - 8
Abnormal Noise Due to Hydraulic Lash Adjustor ...................................................... 6- 9
Troubleshooting Procedure ......................................................................................... 6- 9
Abnormal Combustion ................................................................................................. 6-11
Engine Oil Consumption Excessive............................................................................ 6-12
Fuel Consumption Excessive ...................................................................................... 6-13
Oil Problems.................................................................................................................. 6-13
Engine Oil Pressure Check .......................................................................................... 6-13
Malfunction Indicator Lamp ......................................................................................... 6-14

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Page 2002 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6-2 ENGINE DIAGNOSIS (C24SE)
Engine Diagnosis
Hard Starting
1.Starting Motor Does Not Turn Over
Trouble Shooting Procedure
Turn on headlights and starter switch.
Condition Possible cause Corr

Page 2003 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE DIAGNOSIS (C24SE) 6-3
3.Trouble in Fuel System Condition Possible cause Correction
Starting motor turns over and
spark occurs but engine does not
start. Fuel tank empty Fill

Water in

Page 2004 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6-4 ENGINE DIAGNOSIS (C24SE)
Rough Engine Idling or Engine Stalling
Condition Possible cause Correction
Trouble in fuel injection system Idle air control valve defective Replace
Throttle shutti

Page 2005 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE DIAGNOSIS (C24SE) 6-5
Rough Engine Running
Condition Possible cause Correction
Engine misfires regularly Ignition coil layer shorted Replace
Spark plugs fouling Clean or install hotter ty

Page 2006 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6-6 ENGINE DIAGNOSIS (C24SE)
Hesitation
Condition Possible cause Correction
Hesitation on acceleration Throttle Position Sensor
adjustment incorrect Replace throttle valve assembly

Throttle Po

6-6 ENGINE DIAGNOSIS (C24SE)
Hesitation
Condition Possible cause Correction
Hesitation on acceleration Throttle Position Sensor
adjustment incorrect Replace throttle valve assembly

Throttle Position Sensor circuit
open or shorted Correct or replace

Excessive play in accelerator
linkage Adjust or replace

Manifold Absolute Pressure
(MAP) Sensor circuit open or
shorted Correct or replace

MAP Sensor defective Replace
Intake Air Temperature (IAT)
Sensor circuit open or shorted Correct or replace

Knock Sensor (KS) Circuit open or
shorted Correct or replace
KS
defective Replace
KS Module circuits open or
shorted Correct or replace

KS Module defective Replace
IAT Sensor defective Replace
Hesitation at high speeds
(Fuel pressure too low) Fuel tank strainer clogged Clean or replace

Fuel pipe clogged Clean or replace
Fuel filter clogged Replace
Defective fuel pump system Check and replace
Fuel Pressure Control Valve
leaking Replace
Hesitation at high speeds
(Fuel injector not working
normally) Power supply or ground circuit for
Multiport Fuel Injection System
shorted or open Check and correct or replace

Cable of Multiport Fuel Injection
System disconnected or defective Correct or replace
Hesitation at high speeds
Engine Control Module defective Replace
Throttle Position Sensor circuit
open or shorted Correct or replace

Throttle Position Sensor defective Replace
Engine Coolant Temperature
Sensor circuit open or shorted Correct or replace

Engine Coolant Temperature
Sensor defective Replace

MAP Sensor cable open or
shorted Correct or replace

MAP Sensor defective Replace
IAT Sensor circuit open or shorted Correct or replace
IAT Sensor defective Replace
KS Circuit open or shorted Correct or replace
KS defective Replace
KS Module circuit open or shorted Correct or replace
KS Module defective Replace
Throttle valve not wide opened Check and correct or replace
Air Cleaner Filter clogged Replace filter element
Power supply voltage too low Check and correct or replace

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Page 2007 of 6020

ISUZU KB P190 2007 Workshop Repair Manual ENGINE DIAGNOSIS (C24SE) 6-7
Engine Lacks Power
Condition Possible cause Correction
Trouble in fuel system Fuel Pressure Control Valve not
working normally Replace

Fuel injector clogged Clean

Page 2008 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 6-8 ENGINE DIAGNOSIS (C24SE)
Condition Possible cause Correction
Engine overheating Level of Engine Coolant too low Replenish
Thermo switch or fan motor
defective Replace
Thermostat
defecti

6-8 ENGINE DIAGNOSIS (C24SE)
Condition Possible cause Correction
Engine overheating Level of Engine Coolant too low Replenish
Thermo switch or fan motor
defective Replace
Thermostat
defective Replace
Engine Coolant pump defective Correct or replace
Radiator clogged Clean or replace
Radiator filter cap defective Replace
Level of oil in engine crankcase
too low or wrong oil in engine Change or replenish

Resistance in exhaust system
increased Clean exhaust system or replace
defective parts
Throttle Position Sensor
adjustment incorrect Adjust Wide Open Throttle switch
setting
Throttle Position Sensor circuit
open or shorted Correct or replace

Cylinder head gasket damaged Replace
Cooling Fan clutch defective Replace
Fan belt slipping Adjust tension of V-belt or replace
V-belt
Engine overcooling Thermostat defective Replace (Use a thermostat set to
open at 92 °C (197.6 °F))
Engine lacks compression - Refer to Hard Start
Others Tire inflation pressure abnormal Adjust to recommend pressures
Brake drag Adjust
Clutch slipping Adjust or replace
Level of oil in engine crankcase
too high Correct level of engine oil

Engine Noisy
Abnormal engine noise often consists of various
noises originating in rotating parts, sliding parts and
other moving parts of the engine. It is, therefore,
advisable to locate the source of noise systematically.
Condition Possible cause Correction
Noise from crank journals or from
crank bearings
(Faulty crank journals and crank
bearings usually make dull noise
that becomes more evident when
accelerating) Oil clearance increased due to
worn crank journals or crank
bearings Replace crank bearings and
crankshaft or regrind crankshaft
and install the over size bearing
Crankshaft out of round Replace crank bearings and
crankshaft or regrind crankshaft
and install the over size bearing
Crank bearing seized Replace crank bearings and
crankshaft or regrind crankshaft
and install the over size bearing

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Load next 8 pages

Page: < prev 1-10 ... 1969-1976 1977-1984 1985-1992 1993-2000 2001-2008 2009-2016 2017-2024 2025-2032 2033-2040 ... 6024 next >

center console jump cable CD changer horn bluetooth fog light