Diagnostic procedure
WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
NO. 23 A/C DOES NOT WORK SUFFICIENTLY [AJ] DIAGNOSTIC PROCEDURE
| STEP |
INSPECTION |
ACTION |
| 1 |
- Connect WDS or equivalent to DLC-2.
- Turn ignition switch to ON position (Engine OFF).
- Retrieve any DTCs.
- Are there any DTCs displayed?
|
Yes |
DTC is displayed:
- Go to appropriate DTC test.
|
| No |
No DTC is displayed:
|
| 2 |
- Disconnect A/C compressor connector.
- Start engine and turn A/C switch on.
- Is there correct voltage at terminal of A/C magnetic clutch connector?
Specification
More than 10.5 V |
Yes |
Inspect for GND condition of magnetic clutch on A/C compressor.
- If GND condition is okay, inspect for open circuit of magnetic clutch coil.
|
| No |
Go to the next step. |
| 3 |
- Disconnect refrigerant pressure switch connector.
- Connect jumper wire between terminals B and C (high and low pressure side) of refrigerant pressure switch connector.
- Start engine and run it at idle.
- Turn A/C switch on and set blower fan at any speed.
- Does A/C work?
|
Yes |
Inspect refrigerant pressure switch operation.
- If switch is okay, go to the next step.
|
| No |
Inspect for the following:
- A/C switch is stuck open
- Open circuit between refrigerant pressure switch and PCM terminal 5
- Open circuit of blower motor fan switch and resistor (if blower motor does not operate)
- Inspect evaporator temperature sensor and A/C amplifier
|
| 4 |
- Remove jumper wire from switch connector.
- Reconnect connector to refrigerant pressure switch.
- Start engine and turn A/C switch on.
- Does fan operate?
|
Yes |
Inspect for the following:
- A/C relay is stuck open.
- Open circuit between A/C relay and PCM terminal 47
|
| No |
Inspect for the following and repair or replace if necessary:
- Refrigerant charging amount
- A/C compressor for being seized
|
| 5 |
- Verify test results.
- If okay, return to diagnostic index to service any additional symptoms.
- If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
- If vehicle is repaired, troubleshooting completed.
- If vehicle is not repaired or additional diagnostic information is not available, reprogram PCM if later calibration is available. Retest.
|