ACIS Control Circuit
DESCRIPTION
ACIS (Acoustic
Control Induction System) controls the opening and closing the intake
air control valve sub-assembly built into the intake air surge tank
assembly to increase the intake efficiency according to the engine load.
When
the engine speed is between 0 and 4300 rpm and the throttle valve
opening angle is 30° or more, the ECM activates the No. 1 vacuum
switching valve (for intake air control valve sub-assembly) which then
applies vacuum from the vacuum pump assembly to the diaphragm actuator
sub-assembly and closes the intake air control valve sub-assembly.
When
the engine speed and/or throttle valve opening angle are not as
specified above, the ECM deactivates the No. 1 vacuum switching valve
(for intake air control valve sub-assembly), causing the intake air
control valve sub-assembly to open.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. |
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR INTAKE CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for Intake Control.
Powertrain > Engine > Active Test
|
Tester Display |
| Activate the VSV for Intake Control |
(e)
According to the display on the Techstream, perform the Active Test to
operate the No. 1 vacuum switching valve (for intake air control valve
sub-assembly) and check for the operating sound of the intake air
control valve sub-assembly in the intake air surge tank assembly.
OK:
Operating sounds can be heard.
| OK |  |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
NG |
 | |
| 2. |
INSPECT INTAKE AIR SURGE TANK ASSEMBLY (INTAKE AIR CONTROL VALVE SUB-ASSEMBLY OPERATION) |
(a) Inspect the intake air surge tank assembly (intake air control valve sub-assembly).
Click here 
| NG |
| REPLACE INTAKE AIR SURGE TANK ASSEMBLY |
|
OK | |
| |
| 3. |
INSPECT
VACUUM HOSE SUB-ASSEMBLY (NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR
CONTROL VALVE SUB-ASSEMBLY) - INTAKE AIR SURGE TANK ASSEMBLY) |
(a)
Check the vacuum hose sub-assembly (No. 1 vacuum switching valve (for
intake air control valve sub-assembly) - intake air surge tank assembly)
for looseness, disconnection and blockage.
OK:
No looseness, disconnection or blockage.
| NG |
| REPAIR OR REPLACE VACUUM HOSE SUB-ASSEMBLY |
|
OK | |
| |
| (a) Disconnect the vacuum hose sub-assembly from the No. 1 vacuum switching valve (for intake air control valve sub-assembly). |
|
(b) Start the engine.
(c) Using your finger, confirm that the hose has suction.
|
Result | Proceed to |
|
Suction applied | A |
|
No suction | B |
| B |
| GO TO STEP 9 |
|
A | |
| |
| 5. |
INSPECT NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) |
(a) Inspect the No. 1 vacuum switching valve (for intake air control valve sub-assembly).
Click here
| NG |
| REPLACE NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) |
|
OK | |
| |
| 6. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY)) |
| (a) Disconnect the No. 1 vacuum switching valve (for intake air control valve sub-assembly) connector. |
 |
|
*a | Front view of wire harness connector
(to No. 1 Vacuum Switching Valve (for Intake Air Control Valve Sub-assembly)) | | |
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|
C27-2 (+B) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| NG |
| GO TO STEP 8 |
|
OK | |
| |
| 7. |
CHECK HARNESS AND CONNECTOR (NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) - ECM) |
(a) Disconnect the No. 1 vacuum switching valve (for intake air control valve sub-assembly) connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|
C27-1 (ACIS) - C56-66 (ACIS) |
Always | Below 1 Ω |
|
C27-1 (ACIS) or C56-66 (ACIS) - Body ground and other terminals |
Always | 10 kΩ or higher |
| OK |
| REPLACE ECM |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 8. |
CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - NO. 1 VACUUM SWITCHING VALVE (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY)) |
(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the No. 1 vacuum switching valve (for intake air control valve sub-assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|
5 (EFI-MAIN NO. 1 relay) - C27-2 (+B) |
Always | Below 1 Ω |
|
5 (EFI-MAIN NO. 1 relay) or C27-2 (+B) - Body ground and other terminals |
Always | 10 kΩ or higher |
| OK |
| GO TO ECM POWER SOURCE CIRCUIT |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 9. |
INSPECT VACUUM PUMP ASSEMBLY |
(a) Inspect the vacuum pump assembly.
Click here
| OK |
| REPAIR
OR REPLACE VACUUM HOSE SUB-ASSEMBLY (NO. 1 VACUUM SWITCHING VALVE (FOR
INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) - VACUUM PUMP ASSEMBLY) |
| NG |
| REPLACE VACUUM PUMP ASSEMBLY |
Active Control Engine Mount System
DESCRIPTION
LOCATION
|
*1 | Vacuum Switching Valve (for Active Control Engine Mount System) |
*2 | Front Engine Mounting Insulator |
|
*3 | Rear Engine Mounting Insulator |
- | - |
The
active control engine mount system decreases engine vibration at a low
engine speed using the vacuum switching valve (for active control engine
mount system). The vacuum switching valve (for active control engine
mount system) is controlled by a pulse signal transmitted to the vacuum
switching valve (for active control engine mount system) from the ECM.
The frequency of this pulse signal is matched to the engine speed to
decrease engine vibration.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. |
PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE ACM INHIBIT) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Active Test / Activate the ACM Inhibit.
Powertrain > Engine > Active Test
|
Tester Display |
| Activate the ACM Inhibit |
(e)
According to the display on the Techstream, perform the Active Test to
operate the vacuum switching valve (for active control engine mount
system) and for check the operating sound of the vacuum switching valve
(for active control engine mount system).
OK:
Operating sounds can be heard.
| NG |
 | GO TO STEP 6 |
|
OK |
 | |
|
*1 | Engine |
|
*2 | Vacuum Pump Assembly |
|
*3 | Front Engine Mounting Insulator |
|
*4 | Rear Engine Mounting Insulator |
|
*5 | ECM |
|
*6 | Vacuum Switching Valve (for Active Control Engine Mount System) |
(a) Check the air and vacuum hoses for looseness, disconnection and blockage.
OK:
No looseness, disconnection or blockage.
| NG |
| REPAIR OR REPLACE VACUUM HOSES |
|
OK | |
| |
(a) Disconnect the vacuum hose from the vacuum pump assembly.
(b) Start the engine.
(c) Check that the disconnected port located on the vacuum pump assembly applies suction to your finger.
OK:
Vacuum exists.
| NG | |
REPLACE VACUUM PUMP ASSEMBLY |
|
OK | |
| |
| 4. |
INSPECT FRONT ENGINE MOUNTING INSULATOR |
(a) Inspect the front engine mounting insulator.
Click here
| NG | |
REPLACE FRONT ENGINE MOUNTING INSULATOR |
|
OK | |
| |
| 5. |
INSPECT REAR ENGINE MOUNTING INSULATOR |
(a) Inspect the rear engine mounting insulator.
Click here
| OK | |
SYSTEM NORMAL |
| NG |
| REPLACE REAR ENGINE MOUNTING INSULATOR |
| 6. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SWITCHING VALVE (FOR ACTIVE CONTROL ENGINE MOUNT SYSTEM)) |
|
*a | Front view of wire harness connector
(to Vacuum Switching Valve (for Active Control Engine Mount System)) |
(a) Disconnect the vacuum switching valve (for active control engine mount system) connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|
C11-1 (+B) - Body ground |
Engine switch on (IG) |
11 to 14 V |
| NG |
| GO TO ECM POWER SOURCE CIRCUIT |
|
OK | |
| |
| 7. |
INSPECT VACUUM SWITCHING VALVE (FOR ACTIVE CONTROL ENGINE MOUNT SYSTEM) |
(a) Inspect the vacuum switching valve (for active control engine mount system).
Click here
| NG |
| REPLACE VACUUM SWITCHING VALVE (FOR ACTIVE CONTROL ENGINE MOUNT SYSTEM) |
|
OK | |
| |
| 8. |
CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE (FOR ACTIVE CONTROL ENGINE MOUNT SYSTEM) - ECM) |
(a) Disconnect the vacuum switching valve (for active control engine mount system) connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|
C11-2 (ACM) - C56-39 (ACM) |
Always | Below 1 Ω |
|
C11-2 (ACM) or C56-39 (ACM) - Body ground and other terminals |
Always | 10 kΩ or higher |
| OK |
| REPLACE ECM |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
Basic Inspection
CAUTION / NOTICE / HINT
When
a malfunction is not confirmed by the DTC check, troubleshooting should
be carried out for all circuits considered to be possible causes of the
problem. In many cases, by carrying out the basic engine check shown in
the following procedure, the location of the problem can be found
quickly and efficiently. Therefore, using this check is essential when
troubleshooting the engine.
PROCEDURE
NOTICE:
Carry out this check with the engine stopped and the engine switch off.
|
Result | Proceed to |
|
11 V or higher | OK |
|
Below 11 V | NG |
| NG |
 | CHARGE OR REPLACE BATTERY |
|
OK |
 | |
| 2. |
CHECK WHETHER ENGINE CRANKS |
| NG |
| PROCEED TO PROBLEM SYMPTOMS TABLE |
|
OK | |
| |
| 3. |
CHECK WHETHER ENGINE STARTS |
| NG |
| GO TO STEP 6 |
|
OK | |
| |
| 4. |
CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY |
(a) Visually check that the air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.
| NG |
| REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY |
|
OK | |
| |
(a) Check the engine idle speed.
Click here 
| NG |
| PROCEED TO PAGE AND CONTINUE TO TROUBLESHOOT |
|
OK | |
| |
(a) Check the fuel pressure.
Click here
| NG |
| PROCEED TO PAGE AND CONTINUE TO TROUBLESHOOT |
|
OK | |
| |
(a) Perform a spark test.
Click here
| OK |
| PROCEED TO PROBLEM SYMPTOMS TABLE |
| NG |
| PROCEED TO PAGE AND CONTINUE TO TROUBLESHOOT |
