DTC P0645
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P0645: A/C Clutch Relay Control Circuit Any of the following conditions is met.
•A/C compressor relay drive circuit is open. (1 D/C detection logic but MIL does not light up)•A/C compressor relay drive circuit is shorted to power supply. •A/C compressor relay drive circuit is shorted to ground. |
•A/C compressor relay (coil side) and/or its circuit
•ECM |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | A2: | A/C compressor relay drive circuit | 2. | A/C compressor relay |
| A1: | A/C compressor relay power supply circuit (coil side) | 1. | ECM | 3. | A/C compressor |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
A/C compressor relay power supply circuit (coil side) check
1)When ignition is “OFF”, remove A/C compressor relay.
2)Check for proper terminal connection to A/C compressor relay connector.
3)If connections are OK, set ignition “ON”.
4)Check that voltage between “A1” circuit and ground is battery voltage.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
A/C compressor relay drive circuit check
1)When ignition is “OFF”, disconnect “E01” connector from ECM.
2)Check for proper terminal connection to “E01” connector.
3)If connections are OK, check the following points.
•Resistance of “A2” circuit: less than 1 Ω
•Resistance between “A2” circuit and ground: infinity •Resistance between “A2” circuit terminal and other terminal at A/C compressor relay connector: infinity •Voltage of “A2” circuit: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 4.
|
Repair or replace defective wire harness.
|
| 4 |
A/C compressor relay check
1)Check A/C compressor relay for resistance.
•Manual A/C model:
•Automatic A/C model: Is check result OK?
|
Replace ECM and recheck DTC.
|
Replace A/C compressor relay.
|