Kia Sorento 2001 General Information Manual page 326

Idling condition : 0.4~0.6V
Throttle valve fully open:4.1~4.3V
Is TP sensor OK?
Check vacuum in intake manifold while engine
is idling.
8
Vacuum : more than 18.9 inHg (480 mmHg)
Is intake manifold vacuum within specification?
Disconnect injector connector one by one
9 while engine is idling, and check equal engine
speed decrease for each cylinder?
Check cleanness of air cleaner element.
10
Is air cleaner element OK?
Replace air cleaner element.
Fuel line pressure : 46~51 psi (320~350 kPa,
11
3.2~3.5 kg/cm²)
Is fuel line pressure within specification?
Does fuel line pressure increase when
accelerating abruptly.
12
Fuel line pressure : 48 psi (330 kPa, 3.3
kg/cm²)
Check mass air flow sensor
-Internal resistance, voltage, contamination of
sensor element, ect.
13 -Measure output voltage
IDLE(800rpm):0.9~1.1V
NO LOAD(3000 rpm): 1.8~2.0V
Is MAF sensor OK?
Check ignition system.
-Check resistance of DLI coil
Primary : 0.45~0.55Ω
14 Secondary : 13~15 kΩ
Check wiring harness between DLI coils and
ECM.
Is ignition system OK?
Check spark plug wires.
15
Are spark plug wires OK?
Check spark plug
- Spark plug gap : 0.027~0.031 in (0.7~0.8mm)
16 - Excessive carbon deposit
- Contact with high tension cord
Are spark plugs OK?
17 Check engine compression pressure.
No Replace throttle position sensor.
Yes Go to next step.
Check air leakage into intake system and
No
repair as neessary..
Yes Go to next step.
Check injectors. Refer to fuel system, page
No
22-20.
Yes Go to next step.
No Replace air cleaner element.
Yes Go to next step.
High pressure :
Disconnect return line from filter side.
Blow through line towards tank.
If line is clear, try with new pressure regulator.
If line is blocked, check for blockage in return
line and clean or replace as necessary.
No
Low pressure :
Block return line and check if pressure rises.
If pressure rises, replace pressure regulator.
If pressure does not rise, check fuel filter at
fuel delivery module.
If it is OK, measure fuel pump max.
Pressure and replace as necessary.
Yes Go to next step.
Check fuel line and fuel filter clogging and
No
repair as necessary.
Yes Go to next step.
No Replace mass air flow sensor.
Yes Go to next step.
No Replace ignition coils or repair wiring harness.
Yes Go to next step.
No Replace spark plug wires.
Yes Go to next step.
No Clean or replace as necessary.
Yes Go to next step.