Kia Carens. Manual — part 80

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

Disconnect engine coolant temperature snesor
connector and check that engine condition
improves.
Does engine condition improve?

Yes

Replace the engine coolant temperature
sensor.

No

Go to next step.

7

Check operating sound of injector while engine
is idling. Are injectors operating?

Yes

Go to step 10.

No

Go to next step.

8

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

Yes

Go step 10.

No

Replace injector.

9

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

Yes

Go to next step.

No

Check the engine

10

Replace ECM and check for proper operation.

11

Rough idling / Engine stops while engine is idling - When A/C is in operation

Description

· Engine stops or vibrates excessively when A/C is operating.
· Idling condition is normal when A/C is turned OFF.

(Troubleshooting hint)
1. Malfunction of ISC control system
2. Malfunction of A/C operational switch

Step

Check

Action

1

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

Yes

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

No

Go to next step.

2

Check air conditioner cut relay is ON/OFF
when air conditioner swithc is ON/OFF.
Are A/C cut relay, blower switch and A/C
switch OK?

Yes

Go to next step.

No

Malfunction of air conditioner switch or air
conditioner cut relay.

3

Check for continuity between B01-64, B01-65
and B01-48 of ECM.
Does continuity exist?

Yes

Go to next step.

No

Repair wiring harness.

4

Replace ECM and check for proper operation

12

Abnormal idling / Engine stops immediately after starting

Description

· Starting is normal, but engine vibrates excessively or stops immediately after starting (when accelerating
from idling condition)
· Idling condition is normal on other conditions.

(Troubleshooting hint)
1. Malfunction of ISC system
2. Air leakage at intake system
3. Malfunction of manifold absolute pressure sensor

Step

Check

Action

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

No

Go to next step.

2

Is mass air flow sensor OK?
(Page 21-89)

Yes

Go to next step.

No

Repair mass air flow sensor or related wiring
harness.

3

Check that voltage of throttle position sensor
terminal B18-C is 0.3~0.7V and does not vary.
Is voltage within specification?

Yes

Go to next step.

No

Replace throttle position sensor or wiring
harness.

4

Check for air leakage at intake system and
vacuum of dynamic chamber 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 intake system and dynamic chamber.

5

Replace ECM and check for proper operation.

13

High idle speed after engine warmed up

Description · Excessively high idle speed after engine warmed up

(Troubleshooting hint)
Excessive intake air flow
1. Throttle valve not closed completely
2. Malfunction of idle speed control
· ISC valve stuck
· ISC valve connector disconnected
· Incorrect input signal from coolant temperature sensor

Step

Check

Remedy

1

Check that throttle valve is closed completely
when accelerator pedal is released.
Is throttle valve closed?

Yes

Go to next step.

No

Check correct installation and free operation of
throttle linkage. If not normal, clean or adjust
linkage.

2

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 diagnostic trouble codes, page21-18.

No

Go to next step.

3

Disconnect engine coolant temperature sensor
connector and check if engine condition
improves.
Does engine condition improves?

Yes

Replace engine coolant temperature sensor.

No

Go to next step.

4

Plug PCV hose connected with dynamic
chamber and check engine speed decrease.
Does engine speed decrease?

Yes

Check or replace the PCV valve.

No

Go to next step.

5

Check that voltage of throttle position sensor
terminal is (Y/B wire) is 0.3~0.7V and does not
vary.

Yes

Replace throttle position sensor or wiring
harness.

No

Go to next step.

6

Check ECM terminal voltage.
· ISC valve control

Yes

Go to next step.

· A/C switch input
· Park/neutral input
Are voltages correct?

No

Replace as necessary.

7

Replace ECM and check for proper operation.

14

Variation of idle speed / Idle hunting

Description · Periodic engine speed increase and decrease while engine is idling

(Troubleshooting hint)
1. Malfunction of throttle position sensor system
2. Air leakage
3. Malfunction of IAC control system
4. Fuel injection is irregular
5. Malfunction of ignition system

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

No

Go to next step.

2

Check that voltage of throttle position sensor
terminal B18-C is 0.3~0.7V and does not vary.
Is voltage within specification?

Yes

Go to next step.

No

Replace throttle position sensor or wiring
hraness.

3

Check air cleaner element.
Is air cleaner element OK?

Yes

Go to next step.

No

Replace air cleaner element.

4

Disconnect high tension cord and check equal
engine speed decrease in all cylinders.

Yes

Go to next step.

No

Go to step 7.

5

Check ECM terminal voltage.
· ISC valve control
· A/C switch input
· Park/neutral input
Are voltages correct?

Yes

Go to next step.

No

Check for causes.

6

Check mass air flow sensor(Refer to page
21-89).
Is MAF sensor OK?

Yes

Go to step 12.

No

Replace the mass air flow sensor.

7

Check operating sound of injector while engine
is idling.
Are injectors OK?

Yes

Go to step 9.

No

Go to next step.

8

Check that approx. battery voltage is applied
to injector connector terminals.
Is voltage within specification?

Yes

Go to next step.

No

Check the wiring harness between ECM and
injector.

9

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

Yes

Go to next step.

No

Replace injector.

10

Check spark plugs for proper operation.
Are spark plugs OK?

Yes

Go to next step.

No

Clean or replace.

11

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 for cause.

12

Check for fuel leakage from injectors.

Yes

Replace the injector

Do injecors leak?

No

Go to next step.

13

Replace ECM and check for roper operation.

15

Engine stalls on deceleration

Description

· Engine stops unexpectedly during or after deceleration
· Idling condition is normal

(Troubleshooting hint)
Engine speed decreases abruptly when accelerator pedal is released, which can cause connectors to come loose.
1. Malfunction of idle air control
2. Malfunction of throttle position sensor system
3. Malfunction of fuel cut 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 turned ON?

Yes

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

No

Go to next step.

2

Check throttle position sensor, IAC valve
terminal voltage and related wiring harness.
Are sensors OK?

Yes

Go to next step.

No

Repair the wiring harness or replace defective
component.

3

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

Yes

Go to next step.

No

Check for cause and repair as necessary.

4

Check contact condition of the following
connectors :
- Throttle position sensor, mass air flow
sensor, ignition coils, injector, crankshaft
position sensor, fuel pump relay, ECM.
Are terminal connections OK?

Yes

Go to next step.

No

Repair or replace.

5

Replace ECM and check for proper operation.

16

Engine stalls suddenly (Intermittent), sudden engine stop

Description

· Engine stops suddenly and intermittently
· Engine is normal until engine stops

(Troubleshooting hint)
1. Malfunction of IAC control system
2. Malfunction of throttle position sensor system
3. Intermittently loosened contact of electrical wiring harness

Step

Check

Remedy

1

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

Yes

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

No

Go to next step.

2

Check contact condition of the following
connectors :
- Throttle position sensor, mass air flow
sensor, ignition coils, injector, crankshaft
position sensor, fuel pump relay ECM.
Are connections OK?

Yes

Go to next step.

No

Repair or replace as necessary.

3

Measure crankshaft position sensor and mass

Yes

Go to next step.