Ecd System Air Conditioning Signal Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING GTS (AIR CONDITIONING SIGNAL)
CHECK ECM (AC1 VOLTAGE)
CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER)
ECD SYSTEM - Air Conditioning Signal Circuit |
DESCRIPTION
When the A/C compressor is on, the A/C amplifier sends the A/C signal to the ECM and the ECM increases the fuel injection volume to improve driveability during engine idling.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING GTS (AIR CONDITIONING SIGNAL) |
Connect the GTS to the DLC3.
Start the engine.
Turn the A/C switch on.
Enter the following menus: Powertrain / Engine and ECT / Data List / A/C SIG.
- Result:
Switch Condition
| A/C SIG
|
A/C switch off
| OFF
|
A/C switch on
| ON
|
| 2.CHECK ECM (AC1 VOLTAGE) |
Start the engine.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
G182-34 (AC1) - Body ground
| A/C switch on
| Below 1.5 V
|
G182-34 (AC1) - Body ground
| A/C switch off
| 7.5 to 14 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:
Tester Connection
| Condition
| Specified Condition
|
G25-17 (AC1) - G182-34 (AC1)
| Always
| Below 1 Ω
|
G25-17 (AC1) or G182-34 (AC1) - Body ground
| Always
| 10 kΩ or higher
|
Reconnect the A/C amplifier connector.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
