Mazda 2002 6 Workshop Manual page 364

A/C Cut-off Control System Inspection
1. Start the engine.
2. Turn the A/C switch and fan switch on.
3. Verify that the A/C compressor magnetic clutch actuates.
• If it does not actuate, go to symptom troubleshooting "No.23 A/C does not work sufficiently".
4. Fully open the throttle valve and verify that the A/C compressor magnetic clutch does not actuate for 2—5
seconds.
• If it actuates, inspect as follows.
(1) Connect WDS or equivalent to the DLC-2.
(2) Turn the A/C switch off.
(3) Turn the ignition switch to ON position.
(4) Select ACCS PID.
(5) Turn the A/C relay from off to on and inspect if the operation sound of the relay is heard.
• If the operation sound is heard, inspect TP PID.
• If the operation sound is not heard, inspect following.
— A/C relay
— Open or short to GND circuit in wiring harness and connectors (Ignition switch-A/C relay-PCM
terminal 4O)
— A/C related parts
Cooling Fan Control System Inspection
L8, LF (General area) engine model
Cooling fan system operation
Engine condition
ECT below 100°C
{212°F}
ECT above 100°C
{212°F} (until below
97°C {207°F})
ECT above 108°C
{228°F} (until below
105°C {230°F})
A/C and fan switches
are on.
ECT sensor
malfunction
Cooling fan relay No.1
1. Connect WDS or equivalent to DLC-2.
2. Verify that ECT PID is below cooling fan operating temperature.
3. Verify that A/C switch and fan switch are off.
4. Turn the ignition switch to ON position.
5. Verify that the cooling fan is not operating.
• If the cooling fan No.1 is operating:
(1) Select FAN3 PID.
(2) Send OFF and verify the cooling fan is off.
• If the cooling fan is on, inspect the following.
— Cooling fan relay stuck in closed position
— Short to GND circuit between cooling fan relay and PCM terminal 4L
— Short to power in circuit at cooling fan relay
— DTC for ECT sensor (P0117, P0118)
• If the cooling fan is off, inspect the following.
— Short to GND circuit between refrigerant pressure switch and PCM terminal 1AC
— DTC for ECT sensor (P0117, P0118)
6. Start the engine.
7. Verify that the cooling fan is operating when engine is hot.
• If the cooling fan does not operate, perform the following.
1. Connect WDS or equivalent to the DLC-2.
2. Select FAN3 PID.
3. Operate cooling fan by sending ON command.
F–234
TROUBLESHOOTING
Cooling fan Cooling fan
relay No.1 relay No.2
OFF OFF
ON OFF
ON ON
ON ON
ON ON