СИСТЕМА ECD - Air Conditioning Cut Control Circuit
DESCRIPTION
This circuit cuts air conditioning operation during vehicle acceleration in order to increase acceleration performance. During acceleration with the vehicle speed at 30 km/h (19 mph) or less and the accelerator pedal opening angle at 45° or more, the A/C magnetic switch is turned off for several seconds.
The air conditioning is also controlled using the engine coolant temperature output from the ECM to the A/C amplifier.
WIRING DIAGRAM
INSPECTION PROCEDURE
When using intelligent tester:
| 1.READ VALUE USING INTELLIGENT TESTER (CHECK OPERATION OF AIR CONDITIONING CUT CONTROL) |
Connect the intelligent tester to the DLC3.
Start the engine and turn the air conditioning switch on.
- The A/C magnetic clutch is turned on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / A/C Cut SIG.
Check operation of the A/C magnetic clutch cut when air conditioning cut control is operated by the intelligent tester.
- OK:
- A/C magnetic clutch is turned off.
| OK | |
| |
| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
|
| 2.INSPECT ECM (ACT VOLTAGE) |
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| G62-8 (ACT) - Body ground | Engine idling | 11 to 14 V |
| G62-8 (ACT) - Body ground | Ignition switch ON, engine stopped | 0 to 3 V |
Text in Illustration| *a | Component with harness connected
(ECM) |
| 3.CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER) |
Disconnect the A/C amplifier connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
| Tester Connection | Condition | Specified Condition |
| G25-27 (ACT) - G62-8 (ACT) | Always | Below 1 Ω |
- Standard Resistance (Check for Short):
| Tester Connection | Condition | Specified Condition |
| G25-27 (ACT) or G62-8 (ACT) - Body ground | Always | 10 kΩ or higher |
Reconnect the A/C amplifier connector.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| REPLACE AIR CONDITIONING AMPLIFIER
|
|
When not using intelligent tester:
| 1.CHECK ECM (ACT VOLTAGE) |
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| G62-8 (ACT) - Body ground | Engine idling | 11 to 14 V |
| G62-8 (ACT) - Body ground | Ignition switch ON, engine stopped | 0 to 3 V |
Text in Illustration| *a | Component with harness connected
(ECM) |
| 2.CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER) |
Disconnect the A/C amplifier connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
| Tester Connection | Condition | Specified Condition |
| G25-27 (ACT) - G62-8 (ACT) | Always | Below 1 Ω |
- Standard Resistance (Check for Short):
| Tester Connection | Condition | Specified Condition |
| G25-27 (ACT) or G62-8 (ACT) - Body ground | Always | 10 kΩ or higher |
Reconnect the A/C amplifier connector.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| REPLACE AIR CONDITIONING AMPLIFIER
|
|
