SFI SYSTEM, Diagnostic DTC:P0660

DTC Code	DTC Name
P0660	Intake Manifold Tuning Valve Control Circuit / Open (Bank 1)

DESCRIPTION

This circuit opens and closes the Intake Air Control Valve (IACV) in response to changes in the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System).

*1	Vacuum Switching Valve (for Acoustic Control Induction System)	*2	Intake Air Control Valve
*a	Intake Air Control Valve Open	*b	Intake Air Control Valve Close


DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0660	Intake Manifold Tuning Valve Control Circuit / Open (Bank 1)	The following conditions are met simultaneously for 0.5 seconds or more (2 trip detection logic): Voltage of terminal ACIS of the ECM is low when the vacuum switching valve (for acoustic control induction system) is off. The engine has been started.	Open or short in vacuum switching valve (for acoustic control induction system) circuit Vacuum switching valve (for acoustic control induction system) ECM	Comes on	DTC stored

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure)
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the GTS on.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the pending DTCs.
Tip:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0660.

Check the DTC judgment result.


GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tip:

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tip:

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR INTAKE CONTROL)

*1	Port F
*2	Port E
*3	Air Filter
*a	Vacuum Switching Valve (for Acoustic Control Induction System) is ON
*b	Vacuum Switching Valve (for Acoustic Control Induction System) is OFF
*c	Air

Disconnect the vacuum hose from port F of the vacuum switching valve (for acoustic control induction system).

Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Intake Control.

Powertrain > Engine and ECT > Active Test


Tester Display
Activate the VSV for Intake Control

Operate the vacuum switching valve (for acoustic control induction system).

Check the vacuum switching valve (for acoustic control induction system) air flow when switching the vacuum switching valve (for acoustic control induction system).

OK


Activate the VSV for Intake Control	Specified Condition
ON	Air from port E flows out through port F
OFF	Air from port E flows out through air filter

Result


Proceed to
OK
NG

OK

CHECK FOR INTERMITTENT PROBLEMS

(Click here)

NG

INSPECT VACUUM SWITCHING VALVE (FOR ACOUSTIC CONTROL INDUCTION SYSTEM)

Inspect the vacuum switching valve (for acoustic control induction system) (Click here).

Result


Proceed to
OK
NG

NG

REPLACE VACUUM SWITCHING VALVE (FOR ACOUSTIC CONTROL INDUCTION SYSTEM)

(Click here)

OK

CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SWITCHING VALVE (FOR ACOUSTIC CONTROL INDUCTION SYSTEM))

*a	Front view of wire harness connector (to Vacuum Switching Valve (for Acoustic Control Induction System))

Disconnect the vacuum switching valve (for acoustic control induction system) connector.

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.

Standard Voltage


Tester Connection	Condition	Specified Condition
B44-2 - Body ground	Ignition switch ON	11 to 14 V

Result


Proceed to
OK
NG

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (VACUUM SWITCHING VALVE (FOR ACOUSTIC CONTROL INDUCTION SYSTEM) - EFI-MAIN NO.1 RELAY)

OK

CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE (FOR ACOUSTIC CONTROL INDUCTION SYSTEM) - ECM)

Disconnect the vacuum switching valve (for acoustic control induction system) connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance


Tester Connection	Condition	Specified Condition
B44-1 - B75-50 (ACIS)	Always	Below 1 Ω
B44-1 or B75-50 (ACIS) - Body ground	Always	10 kΩ or higher

Result


Proceed to
OK
NG

OK

REPLACE ECM

(Click here)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR