F–234
TROUBLESHOOTING
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
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.
Engine condition
Cooling fan
relay No.1
Cooling fan
relay No.2
ECT below 100°C
{212°F}
OFF OFF
ECT above 100°C
{212°F} (until below
97°C {207°F})
ON OFF
ECT above 108°C
{228°F} (until below
105°C {230°F})
ON ON
A/C and fan switches
are on.
ON ON
ECT sensor
malfunction
ON ON
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