P1455

P1455
Air Climatisation control - Range/Performance
A/C compressor control - Interruption

P1456
Air Climatisation Control - too High
A/C compressor control - upper limit exceeded

P1457
Air Climatisation Control - too Low
Compressor control - below lower limit

Function
The magnetic clutch for the A/C compressor is supplied with battery voltage via a relay. The coil of the relay is supplied with battery voltage by the ECM and with ground by the ECM. The diagnosis only monitors the wiring from the ECM, pin 62 to the A/C relay, terminal 85.

Diagnostic condition
A fault is recognized and stored in memory when the engine speed is above 80 1/min and the battery voltage is between 7.5 Volt and 17 Volt.





Wiring Diagram.




DTC P1455.




DTC P1456.




DTC P1457.

Diagnostic procedure
Check control wire for A/C relay, pin 2 for interruptions.
1. Remove A/C relay.
2. Remove ECM connector.
3. Connect ohmmeter to ECM connector, pin 62 and to A/C relay, pin 2.
- Specified value: 0 - 5 ohms.

Check control wire for A/C relay, pin 2 for short circuit to B+.
1. Remove A/C relay.
2. Remove ECM connector.
3. Connect voltmeter (plus) to pin 2 at A/C relay and ground.

- Specified value: 0 Volt
- If meter reads battery voltage, check wiring harness for chafing and pinching damage.

Check control wire for A/C relay, pin 2 (terminal 85) for short circuit to ground.
1. Remove A/C relay.
2. Remove ECM connector.
3. Connect ohmmeter to ground and pin 2 (terminal 85).

- Specified value: infinite resistance
- If meter reads 0 - 5 ohms, check wiring harness for chafing or pinching damage.