Kia Carens. Manual — part 78

Engine compression pressure : 193 (1360 kPa,
13.6 kg/cm²) at 300 rpm
Is engine compression pressure within
specification?

No

Check engine condition :
- Wear of pistion, piston rin and cylinder wall
- Defect of cylinder head gasket
- Deformation of cylinder head
- Improper valve clearance
- Valve stuck to guide

12

Check condition of all spark plugs.
Spark plug gap : 0.027~0.031 in (0.7~0.8mm)
Check for excessive carbon deposit and
correct contact with spark plug wires.
Are spark plugs OK?

Yes

Go to next stpe.

No

Clean or replace.

13

Check crankshaft position sensor.
Is crankshaft position sensor OK?

Yes

Go to next step.

No

Check crankshaft position sensor and related
wire harness.

14

Replace ECM and check for proper operation.

3

Cranks normally, but will not start (partial combustion)-When engine is cold

Description

· Cranks normally, but partial, not continuous, combustion occurs
· Battery is OK
· Fuel present in tank

(Troubleshooting hint)
1. Overrich air/fuel ratio
· Clogged air cleaner element
· Malfunction of mass air flow sensor
2. Overlean air/fuel ratio
· Incorrect fuel injection control (correction for engine coolant temperature)
· Low fuel line pressure
· Air leakage at intake system
3. Low engine compression pressure

Step

Check

Action

1

Check that malfunction indicator light is
illuminated.
While ignition switch is OK?
Does the MIL remain on after engine start-up?

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.

2

Disconnect spark plug.
Crank engine and check for spark at plug wire
terminal. Is spark OK?

Yes

Go to next step.

No

Replace ignition coil or repair wiring harness

No

Replace ignition coils or repair wiring harness.

3

Connect the data link connector terminals
FUEL PUMP and B+ with a jumper wire and
check fuel line pressure while ignition switch is
ON.
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.

4

Does injector operate while cranking engine?

Yes

Go to next step.

No

Check that battery voltage is applied on
injector connector and check wire between
main relay and injector.

5

Check resistance of injector.
Resistance : 14.5Ω
Is resistance within specification?

Yes

Go to next step.

No

Replace injector.

6

Chank condition of IAC valve.
Chank for open circuit between IAC valve and
ECM
Check battery voltage is applied to Red/WHT
wire of IAC valve
Check ISC valve hose connection
Is IAC valve OK?

Yes

Go to next step.

No

Open circuit or incorrect voltage :
- Repair wiring harness
- Replace IAC valve

7

Check terminal voltage of mass air flow
sensor, throttle position sensor, ignition coils,
engine coolant temperature sensor.
Are sensors functioning properly?

Yes

Go to next step.

No

Repair as necessary.

8

Check MAF sensor and related.
Is MAF sensor OK?

Yes

Go to next step.

No

Replace MAF sensor.

9

Check that engine starts when engine coolant
temperature sensor connector is disconnected.
Does engine start?

Yes

Check engine coolant temperature sensor
- If normal : check wiring harness between
engine coolant temperature sensor and ECM
- If not normal : replace engine coolant
temperature sensor.

No

Go to next step.

10

Check air leakage at intake system
components.

Yes

Repair or replace.

No

Go to next step.

11

Check engine compression pressure.
Engine compression pressure : 193 psi
(1360kPa, 13.6 kg/cm²) at 300 rpm
Is engine compression pressure within
specification?

Yes

Go to next stpe.

No

Check engine condition.
- Wear of piston, piston ring and cylinder wall
- Defect of cylinder head gasket
- Deformation of cylinder head- Improper valve
clearance
- Valve stuck to guide

12

Check condition of spark plug.
· Spark plug gap : 0.027~0.031 in (0.7~0.8mm)
· Excessive carbon deposit
· Contact with high tension cord
Are spark plugs OK?

Yes

Go to next step.

No

Clean or replace.

13

Replace ECM and check for proper operation.

4

Cranks, normally, but won't start (partial combustion) - After engine is warmed up

Description

· After engine is left hot after running, cranking speed is OK
· Battery is OK
· Engine starts normally when engine is cold

(Troubleshooting hint)
1. Overrrich air/fuel ratio
· Correction for coolant temperature
· Fuel leakage at injector
2. Vapor lock occurs
· Fuel pressure is not kept when engine stops

Step

Check

Action

1

Warm up engine to normal operating
temperature and stop engine. Connect the
data link connector terminals FUEL PUMP and
B+ with a jumper wire for 3 minutes while
ignition swithc is ON. Then check that engine
starts.B+ with a jumper wire for3 minutes while
ignition swithc is ON. Then check that engine
starts.Does engine start?

Yes

Replace fuel with another brand.

No

Go to step 2.

2

Connect the data link connector terminals
FUEL PUMP and B+ with a jumper wire and
check fuel line pressure while ignition switch is
ON.
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.

3

Plug fuel pressure regulator outlet and check
that fuel pressure is kept while ignition switch
is OFF
Fuel line pressure : 25 psi (180 kPa, 1.8
kg/cm²) for 15 minutes
Is fuel line pressure retention within
specification?

Yes

Replace fuel pressure regulator.

No

Check fuel pump pressure is kept.
- If normal : check fuel leakage from injector
- If not normal : replace fuel delivery module

4

Check that engine starts when engine coolant
temperature sensor connector is disconnected.
Does engine start?

Yes

Check engine coolant temperature sensor.
- If normal : check wiring harness between
engine coolant temperature snesor and ECM
- If not normal : replace engine coolant
temperature sensor

No

Go to next step.

5

Check that malfunction indicator light is
illuminated. Is MIL illuminated?

Yes

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

No

Go to next step.

6

Check terminal voltage of mass air flow
sensor, throttle position sensor, ignition coils,
engine coolant temperature sensor.
Are sensor terminal voltages correct?

Yes

Go to next step.

No

Check for causes.

7

Temporarily install a known good ECM and check for proper operation.

5

Cranks normally, but hard to start - Always

Description

· Cranks normally, but cranking time up to starting is excessively long
· Battery is OK
· Engine is normal while engine is idling (Refer to "Rough ldling" if not in good idling condition)

(Troubleshooting hint)
1. Overrich air/fuel ratio
· Incorrect fuel injection control (correction for engine coolant temperature_

· Low fuel line pressure
· Air leakage at intake system
2. Overrich air/fuel ratio
· Clogged air cleaner element
· Malfunction of manifold absofute pressure sensor
3. Spark plugs not in good condition

Step

Check

Action

1

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

Yes

Malfunction indicator light 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
is 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 intake system.

3

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

Yes

Go to next step.

No

Check air leakage at intake system.

4

Check if engine starts easily when throttle
valve is held quarter open.
Does engine start easily?

Yes

Check carbon deposit on throttle valve and go
to step 6.

No

Go to next step.

5

Check that 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.

6

Check dondition of IAC valve. Check for open
circuit between IAC valve & ECM.
Measure Battery voltage is applied to B/W
wire. Check IAC valve hoe connection. Is IAC
valve OK?

Yes

Go to next step.

No

Check for causes.

7

Connect data link connector terminals fuel
pump and B+ with a jumper wire and check
than engine starts.
Does engine start?

Yes

Check fuel pump relay.
- If normal, repair or replace wiring harness.
- If not normal, replace relay.

No

Go to next step.

8

Check for contamination of sensor inside mass
air flow sensor.
Is MAF sensor cintaminated?

Yes

Clean or replace.

No

Go to next step.

9

Check engine compression pressure.
Engine compression pressure : 193 psi (1360
kPa, 13.6 kg/cm²) at 300 rpm
Is engine compression pressure within
specification?

Yes

Go to next step.

No

Check engine condition.
- Wear of piston, piston ring and cylinder wall
- Defect of cylinder head gasket
- Deformation of cylinder head
- Improper valve clearance
- Valve stuck to guide