DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK ENGINE TYPE
INSPECT A/C COMPRESSOR
CHECK WIRE HARNESS (A/C COMPRESSOR - BODY GROUND)
CHECK WIRE HARNESS (A/C COMPRESSOR - A/C AMPLIFIER)
INSPECT A/C COMPRESSOR
CHECK WIRE HARNESS (A/C COMPRESSOR - BODY GROUND)
CHECK WIRE HARNESS (A/C COMPRESSOR - A/C AMPLIFIER)
DTC B1451/51 Compressor Solenoid Circuit
DESCRIPTION
In this circuit, the compressor receives a refrigerant compression demand signal from the air conditioning amplifier.
Based on this signal, the compressor changes the amount of compressor output.
| DTC No. | DTC Detection Condition | Trouble Area |
| B1451/51 |
Open or short in solenoid of the externally changeable compressor circuit |
A/C compressor
Harness and connector between A/C amplifier and solenoid of externally changeable compressor
A/C amplifier
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Check the engine type.
- Result:
| Result | Proceed to |
4GR-FSE
(Gasoline engine) | A |
2AD-FHV
(Diesel engine) | B |
Disconnect the A/C compressor connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| E8-3 (SOL+) - E8-6 (SOL-) | 20°C (68°F) | 10 to 11 Ω |
| 3.CHECK WIRE HARNESS (A/C COMPRESSOR - BODY GROUND) |
Disconnect the A/C compressor connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| E8-6 (SOL-) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.CHECK WIRE HARNESS (A/C COMPRESSOR - A/C AMPLIFIER) |
Disconnect the A/C compressor connector.
Disconnect the A/C amplifier connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J58-5 (SOL+) - E8-3 (SOL+) | Always | Below 1 Ω |
| J58-5 (SOL+) - Body ground | Always | 10 kΩ or higher |
- Result:
| Result | Proceed to |
| NG | A |
| OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) | B |
| OK (When troubleshooting according to the DTC) | C |
| | PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
| | REPLACE AIR CONDITIONING AMPLIFIER |
|
|
| A | |
| |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
Disconnect the A/C compressor connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| E63-2 (SOL+) - E63-1 (SOL-) | 20°C (68°F) | 10 to 11 Ω |
| 6.CHECK WIRE HARNESS (A/C COMPRESSOR - BODY GROUND) |
Disconnect the A/C compressor connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| E63-1 (SOL-) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 7.CHECK WIRE HARNESS (A/C COMPRESSOR - A/C AMPLIFIER) |
Disconnect the A/C compressor connector.
Disconnect the A/C amplifier connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J58-5 (SOL+) - E63-2 (SOL+) | Always | Below 1 Ω |
| J58-5 (SOL+) - Body ground | Always | 10 kΩ or higher |
- Result:
| Result | Proceed to |
| NG | A |
| OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) | B |
| OK (When troubleshooting according to the DTC) | C |
| | PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
| | REPLACE AIR CONDITIONING AMPLIFIER |
|
|
| A | |
| |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
LEXUS IS250, IS220d / GSE20 ALE20
