Kia Carens. Manual - part 81

air flow sensor signals.
Are sensor signals OK?

No

Repair or replace.

4

Check ECM terminal voltages for B01-2,
B01-29, B01-59, B01-71 and B01-73.
Are voltages OK?

Yes

Go to next step.

No

Check for causes and repair as necessary.

5

Replace ECM and check for proper operation.

17

Stumble / Hesistation on acceleration

Description

· Vehicle seems to stop for a time immediately after pressing accelerator or rattles a little during
acceleration

(Troubleshooting hint)
1. Lean air/fuel ration on acceleration
·Low fuel line pressure
·Air leakage
·Malfunction of fuel injection control

Step

Check

Remedy

1

Check that malfunction indicator light is
illuminated while ignition switch is ON.
Is MIL illuminated longer than 3 seconds after
ignition switch is turned ON?

Yes

Malfunction indicator is illuminated. Check for
causes. Refer to troubleshooting with
diagnostic trouble codes, page21-18.

No

Go to next step.

2

Check vacuum in intake manifold while engine
idling.
Vacuum : more than 18.9 in.Hg (480 mmHg)
Is intake manifold vacuum within specification?

Yes

Go to next step.

No

Check air leakage at air intake system and
repair.

3

Check cleanness of air cleaner element.
Is air cleaner element OK?

Yes

Go to next step.

No

Replace air cleaner element.

4

Check mass air flow sensor.
-Internal resistane, voltage, contamination of
sensor element etc.
Is MAF sensor OK.

Yes

Go to next step.

No

Replace the mass air flow sensor.

5

Check engine coolant temperature sensor.
Is ECT sensor OK?

Yes

Go to next step.

No

Replace the engine coolant temperature
sensor.

6

Check throttle position sensor and related
DTC.
Voltage between terminals :
Idling condition : 0.4~0.6V
Throttle valve full open : 4.1~4.3V
Ia TP sensor OK?

Yes

Go to next step.

No

Replace throttle position sensor.

7

Disconnect injector connector one by one
while engine is idling, and check equal engine
speed decrease for each cylinder.
Does engine speed decrease equally for all
cylinders?

Yes

Go to next step.

No

Check injector.Refer to fuel System, Section
22.

8

Check correct installation and free operation of
throttle linkage.
Is throttle linkage OK?

Yes

Go to next step.

No

Adjust or replace joint or damaged linkage and
adjust deflection of throttle cable.

9

Check fuel line pressure while engine is idling.
Fuel line pressure : 46~51 psi (320~350 kPa,
3.2~3.5 kg/cm²)

Yes

Go to next step.

No

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.

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.

10

Check air passage and vacuum hose
installation.
Are vacuum hoses OK?

Yes

Go to next step.

No

Repair as necessary.

11

Check exhaust system clogging.
Is exhaust system clogged?

Yes

Repair or replace necessary.

No

Go to next step.

12

Replace ECM and check for proper operation.

18

Surging while cruising

Description · Repeated engine speed variation occurs at all times

(Troubleshooting hint)
1. Malfunction of throttle position sensor system
2. Misfire
3. Loose contact of wiring harness
4. Lean air/fuel ratio

Step

Check

Remedy

1

Check that malfunction indicator light is
illuminated while ignition switch is ON.
Is MIL illuminated longer than 3 seconds after
ignition switch is turned ON?

Yes

Malfunction indicator is illuminated. Check for
causes. Refer to troubleshooting with
diagnostic trouble codes, page 21-18

No

Go to next step.

2

Check vacuum in intake manifold while engine
idling.
Vacuum : more than 18.9 inHg (480 mmHg)
Is intake manifold vacuum within specification?

Yes

Go to next step.

No

Check air leakage at air intake system and
repair.

3

Check throttle position sensor.
Voltage between terminals :
Idling condition : 0.4~0.6V
Throttle valve full open : 4.1~4.3V
Is TP sensor OK?

Yes

Go to next step.

No

Replace throttle position sensor.

4

Disconnect front heated oxygen sensor
connector and check for proper operation.
Is front HO2S OK?

Yes

Go to next step.

No

Replace front heated oxygen sensor.

5

Check that vehicle speed sensor signal input
to ECM B01-42.
Is correct. Is signal correct?

Yes

Go to next step.

No

Replace the wiring harness or vehicle speed
sensor.

6

Check ECM terminal voltages for B01-42,
B01-59, and B01-71 and B01-73.. Are voltages
OK?

Yes

Go to next step.

No

Check for causes and repair.

7

Check correct installation and free operation of
throttle linkage.
Is throttle linkage OK?

Yes

Go to next step.

No

Adjust or replace joint or damaged linkage and
adjust deflection of throttle cable.

8

Check cleanness of air cleaner element.

Yes

Go to next step.

Is air cleaner element OK?

No

Replace air cleaner element.

9

Check fuel line pressure while engine is idling.
Fuel line pressure : 46~51 psi (320~350 kPa,
3.2~3.5 kg/cm²)
Is fuel line pressure within specification?

Yes

Go to next step.

No

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.

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.

10

Check exhaust system clogging.
Is exhaust system clogged?

Yes

Repair as necessary.

No

Go to next step.

11

replace ECM and check for proper operation.

19

Lack of power

Description

· Lack of power at full throttle
· Lower maximum vehicle speed
· Idling speed is normal

(Troubleshooting hint)
1. Insufficient intake air
·Throttle valve does not open fully
·Clogged intake air system
2. Lean air/fuel ratio
· Fuel line pressure decrease.
· Malfunction of fuel injection.
3. Malfunction of ignition
4. Low engine compression pressure

Step

Check

Remedy

1

Check the following items.
- Clutch slippage
- Brake dragging
- Lack of tire air pressure
- Improper tire size
Are these systems OK?

Yes

Go to next step.

No

Repair as necessary.

2

Is throttle valve fully open when fully
depressing accelerator pedal fully?

Yes

Go to step 5.

No

Go to next step.

3

Check correct installation of throttle cable. Is
throttle cable OK?

Yes

Go to next step.

No

Repair or replace throttle cable.

4

Check correct operation of throttle body. Is
throttle body OK?

Yes

Go to next step.

No

Repair or replace throttle body.

5

Check that malfunction indicator light is
illuminated while ignition switch is ON.
Is MIL illuminated longer than 3 seconds after
ignition switch is turned ON?

Yes

Malfunction indicator light is illuminated.
Check for causes. Refer to Troubleshooting
with OBD-II Diagnostic Trouble Codes,
page21-18.

No

Go to next step.

6

Check the camshaft position sensor and DTC
related.
Is CMP sensor OK?

Yes

Go to next step.

No

Replace camshaft position sensor or repair
related wire harness.

7

Check throttle position sensor and related DTC
Voltage between terminals :
Idling condition : 0.4~0.6V
Throttle valve full open : 4.1~4.3V
Is TP sensor OK?

Yes

Go to next step.

No

Repair intake system or dynamic chamber.

8

Check vacuum in intake manifold while engine
is idling.
Vacuum : more than 18.9 in.Hg (480 mmHg)
Is intake manifold vacuum within specification?

Yes

Go to next step.

No

Check injector. Refer to fuel system,section
22.

9

Disconnect injector connector one by one
while engine is idling, and check equal engine
speed decrease for each cylinder.
Does engine speed decrease equally for each
cylinder?

Yes

Go to next step.

No

Replace air cleaner element.

10

Check cleanness of air cleaner element.
Is air cleaner element OK?

Yes

Go to next step.

No

Replace air cleaner element.

11

Keep engine idling and turn ignition switch
OFF.
Check that fuel line pressure is retained.
Fuel line pressure : more than 25 (180 kPa,
1.8 kg/cm²) for 5 minutes.
Is fuel pressure retention within specification?

Yes

Go to next step.

No

Plug outlet of pressure regulator and turn
ignition switch OFF. Then check fuel line
pressure is kept.
- If normal : replace pressure regulator.
- If not normal : check fuel pump pressure
kept.
If fuel pump is normal, check fuel leakage from
injector.

12

Does fuel line pressure increase when
accelerating abruptly?
Fuel line pressure : 48 psi (330 kPa, 3.3
kg/cm²)

Yes

Go to next step.

No

Check fuel line and fuel filter clogging and
repair if as necessary.

13

Check mass air flow sensor
-Internal resistance, contamination of sensor
element,etc.
-Measure output voltage
0.9~1.1V when idling
5V when open fully
Is MAF sensor OK?

Yes

Go to next step.

No

Replace ignition coils or repair wiring harness.

14

Check ignition system.
- Check resistance of DLI coil
Primary : 0.45~0.55Ω
Secondary : 13~15 kΩ
- Check wiring harness between DLI coil and
ECM
Is ignition system OK?

Yes

Go to next step.

No

Replace spark plug wires.

15

Check spark plug wires.
Are spark plug wires OK?

Yes

Go to next step.

No

Replace spark plug wires.

16

Check spark plug.
Are spark plugs OK?

Yes

Go to next step.

No

Clean or replace.

17

Check engine compression pressure.

Yes

Go to next step.