Fuel System > Engine Control System > P0660 Intake Manifold Tuning Valve Control Circuit/Open (Bank 1)

Component Location

General Description

VIS(Variable intake system) is a device which varies the length of intake manifold to genetate maximum power at certain RPM. VIS lengthens intake manifold to improve the torque at low RPM when vehicle speed is low while it shortens intake manifold to raise torque at high RPM when vehicle speed is high. PCU controlls VIS using RPM signal.

DTC Description

Checking the output voltage from VIV(Variable Intake Manifold Valve) every 10 sec. under detecting condition, if the value within detecting condition lasts for more than 5 sec., PCM sets P0660. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

•

Check VIS

•	Poor connection

•	Open or short in VIV circuit

•	Faulty VIV

•	Faulty PCM

Enable condition

•	After 0.5 sec under conditions below

•	Engine running

•	11V ≤ Battery voltage ≤ 16V

Threshold value

•	Open or short

Diagnosis time

•	Continuous (More than 5 seconds failure for every 10 seconds test)

MIL ON condition

•	2 driving cycles

Specification

Item	Specification
Coil Resistance (Ω)	30.0 ~ 35.0 Ω[22°C (71.6°F)]

Schematic Diagram

Monitor DTC Status

Check DTC Status

(1)	Connect scantool to Data Link Connector(DLC).

(2)

IG "ON".

(3)	Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.

(4)	Read "DTC Status" parameter.

(5)

Is parameter displayed "Present fault"?

	▶ Go to "Terminal and connector inspection" procedure.
	▶ Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

Terminal And Connector Inspection

1.	Many malfunctions in the electrical system are caused by poor harness and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.	Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
	▶ Go to "Power Circuit Inspection" procedure.

Power Circuit Inspection

■ Check voltage

1.	IG "OFF" and disconnect VIV connector.

2.	IG "ON" and ENG "OFF"

Measure voltage between power terminal of VIV harness connector and chassis ground.

Specification : B+

Is the measured voltage within specification?

	▶ Go to "Control Circuit Inspection" procedure.
	▶ Check fuse connected to power of VIV for open or blown-off. ▶ Repair open or short to ground in harness, and go to "Verification of Vehicle Repair" procedure.

Control Circuit Inspection

■ Check short to ground in harness

1.	IG "OFF" and disconnect VIV connector and PCM connector.

Measure resistance between control terminal of VIV harness connector and chassis ground.

Specification : Infinite

Is the measured voltage within specification?

	▶ Go to "Check open in harness" as follows.
	▶ Repair short to ground in harness, and go to " Verification of Vehicle Repair" procedure.

■ Check open in harness

1.	IG "OFF" and disconnect VIV connector and PCM connector.

Measure resistance between control terminal of VIV harness connector and VIV control terminal of PCM harness connector.

Specification : Below 1Ω

Is the measured resistance within specification?

	▶ Go to " Component Inspection" procedure.
	▶ Repair open in harness, and go to "Verification of Vehicle Repair" procedure.

Component Inspection

■ Check VIV

1.	IG "OFF" and disconnect VIV connector.

Measure resistance between power and control terminals of VIV connector.(Component side)

Specification : 30 ~ 35 Ω (22°C/71.6°F)

Is the measured resistance within specification?

	▶ Substitute with a known - good PCM and ch
	▶ Substitute with a known - good VIV and check for proper operation. If the problem is corrected, replace VIV and go to "Verification of Vehicle Repair" procedure.

Verification Of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.

1.	Connect scantool and select "DTC" button.

2.	Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions

3.	Read "DTC Status" parameter

Is parameter displayed "History(Not Present) fault"?

	▶ System performing to specification at this time. Clear the DTC
	▶ Go to the applicable troubleshooting procedure.