|
When the A/C compressor does
not work, the A/C compressor circuit system or the CAN
bus line may be defective.
|
|
- Malfunction of A/C compressor
- Malfunction of A/C compressor relay
- Malfunction of A/C pressure sensor
- Damaged harness wires and connectors
- Malfunction of engine-ECU <M/T> or
engine-A/T-ECU
<A/T>
- Malfunction of the A/C-ECU
|
|
Use the M.U.T.-III to diagnose the
CAN bus lines.
|
|
Q.
Is the check result normal?
|
|
Repair the CAN bus
lines. (Refer to GROUP 54F - Troubleshooting .)
|
|
|
|
Check whether the air conditioner
sets a diagnosis code or not.
|
|
Q.
Is the check result normal?
|
|
Refer to diagnosis
code chart .
|
|
|
|
Check that the following service
data display contents are normal. (Refer to .)
|
|
Q.
Is the check result normal?
|
|
Inspection Procedure
21: Refer to A/C pressure sensor system
<RHD> .
|
|
|
![](../../../img/55/AC313384AB00ENG.png)
![](../../../img/55/AC313414AI00ENG.png)
|
Q.
Is the check result normal?
Go to Step
5.
Repair
the connector.
|
![](../../../img/55/AC313384AB00ENG.png)
|
(1)Disconnect the connector, and
measure at the wiring harness side. (2)Turn the ignition
switch to the "ON" position.
|
![](../../../img/55/AC313414AI00ENG.png)
![](../../../img/55/AC309471AF00ENG.png)
|
(3)Disconnect engine-ECU connector
or engine-A/T-ECU connector C-110 and earth terminal
8.
|
![](../../../img/55/AC310507AS00ENG.png)
|
(4)Voltage between terminal 1 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
13.
Go to Step
6.
|
|
Q.
Is the A/C compressor relay in good
condition?
|
|
Replace the
A/C compressor relay.
|
|
|
![](../../../img/55/AC313525AB00ENG.png)
|
(1)Remove the relay, and measure at
the relay block side. (2)Turn the ignition switch to the
"ON" position.
|
![](../../../img/55/AC301541HX00ENG.png)
|
(3)Voltage between terminal 3 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
9.
Go to Step
8.
|
![](../../../img/55/AC313414AJ00ENG.png)
![](../../../img/55/AC313419AE00ENG.png)
|
note |
Prior to the wiring harness
inspection, check junction block connectors
C-202, C-205 and intermediate connector C-43,
and repair if necessary.
|
- Check the A/C compressor relay power supply
line for open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
|
![](../../../img/55/AC313525AB00ENG.png)
|
(1)Remove the relay, and measure at
the relay block side.
|
![](../../../img/55/AC301541HY00ENG.png)
|
(2)Voltage between terminal 4 and
body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step
11.
Go to Step
10.
|
![](../../../img/55/AC313371AD00ENG.png)
|
note |
Prior to the wiring harness
inspection, check intermediate connector A-16,
and repair if necessary.
|
- Check the A/C compressor relay power supply
line for open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
|
![](../../../img/55/AC313525AB00ENG.png)
![](../../../img/55/AC313414AI00ENG.png)
|
- Check the A/C compressor relay power supply
line for open circuit.
Q.
Is the check result normal?
Go to Step
12.
Repair
the wiring harness.
|
![](../../../img/55/AC313525AB00ENG.png)
![](../../../img/55/AC313384AB00ENG.png)
|
- Check the A/C compressor power supply line for
open circuit.
Q.
Is the check result normal?
The trouble can be
an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
Repair the wiring
harness.
|
|
Q.
Can the sound of the magnetic clutch (click) be
heard?
|
|
Replace the
compressor magnet clutch.
|
|
|
|
Q.
Is the refrigerant temperature switch operating
properly?
|
|
Replace the
refrigerant temperature switch.
|
|
|
|
Q.
Is the refrigerant level correct?
|
|
Correct the
refrigerant level (Refer to or ).
|
|
|
|
Check that the compressor works
normally.
|
|
Q.
Is the check result normal?
|
|
This diagnosis is
complete.
|
|
|
|
Replace the
engine-ECU or the engine-A/T-ECU.
|
|
|