Isuzu KB P190. Manual — part 501
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 shutting off incomplete
Correct or replace
Throttle position sensor circuit
open or shorted
Correct or replace
Fuel injector circuits open or
shorted
Correct or replace
Fuel injectors damaged
Replace
Fuel pump relay defective
Replace
Manifold Absolute Pressure
Sensor cable disconnected or
broken
Correct or replace
Manifold Absolute Pressure
Sensor defective
Replace
Engine Coolant Temperature
Sensor cable disconnected or
broken
Correct or replace
Engine Coolant Temperature
Sensor defective
Replace
Intake Air Temperature sensor
cable disconnected or broken
Correct or replace
Intake Air Temperature sensor
defective
Replace
Knock Sensor (KS) circuits open
or shorted
Correct or replace
KS
defective
Replace
KS Module circuits open or
ground
Correct or replace
KS Module defective
Replace
Vehicle Speed Sensor circuit open
or shorted
Correct or replace
Vehicle Speed Sensor defective
Replace
Trouble in emission control
system
Engine Control Module defective
Replace
Canister purge solenoid circuit
open
Correct
Canister purge solenoid defective
Replace
Evaporative Emission Canister
Purge control valve defective
Replace
Trouble in ignition system
Refer to Hard Start
Troubleshooting Guide
Others
Engine lacks compression
Refer to Hard Start
Troubleshooting Guide
Valve incorrectly seated
Lap valve
Air Cleaner Filter clogged
Replace filter element
Valve timing incorrect
Readjust
Idle air control valve broken
Replace
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 type plug
Spark plug(s) insulator nose
leaking
Replace
Spark plug wire incorrect
Connect properly or replace
Fuel injector(s) defective
Replace
Engine control module faulty
Replace
Engine knocks regularly
Spark plugs running too hot
Install colder type spark plugs
Powertrain control module faulty
Replace
Engine lacks power
Spark plugs fouled
Clean
Spark plug wire incorrect
Connect properly or replace
Fuel injectors defective
Replace
Manifold Absolute Pressure
(MAP)
Sensor or Manifold Absolute
Pressure Sensor circuit defective
Correct or replace
Engine Coolant Temperature
Sensor or Engine Coolant
Temperature Sensor circuit
defective
Correct or replace
Engine Control Module faulty
Replace
Intake Air Temperature Sensor or
Intake Air Temperature Sensor
circuit defective
Correct or replace
Throttle Position Sensor or
Throttle Position Sensor circuit
defective
Correct or replace
Knock Sensor or Knock Sensor
circuits defective
Correct or replace
Knock Sensor Module or Knock
Sensor Module circuits defective
Correct or replace
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
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 or replace
Fuel pipe clogged
Clean
Fuel filter clogged or fouled
Replace
Fuel pump drive circuit not
working normally
Correct or replace
Fuel tank not sufficiently breathing
due to clogged Evaporative
Emission Control System circuit
Clean or replace
Water in fuel system
Clean
Inferior quality fuel in fuel system
Use fuel of specified octane rating
Engine Control Module supplied
poor voltage
Correct circuit
Throttle Position Sensor cable
disconnected or broken
Correct or replace
Throttle Position Sensor defective
Replace
Manifold Absolute Pressure
Sensor not working normally
Replace
Intake Air Temperature sensor not
working normally
Replace
Engine Coolant Temperature
Sensor circuit open or shorted
Correct or replace
Engine Coolant Temperature
Sensor defective
Replace
Engine Control Module defective
Replace
Trouble in intake or exhaust
system
Air Cleaner Filter clogged
Replace filter element
Air duct kicked or flattened
Correct or replace
Ignition failure
-
Refer to Hard Start
Troubleshooting Guide
Heat range of spark plug
inadequate
Install spark plugs of adequate
heat range
Electronic Ignition System with
module
Replace
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