Part 2
Checking the air conditioning (A/C) system (Continued)
Checking for an open-circuit
- Check cable between fuse 31 and air conditioning (A/C) switch terminal 1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Fault-tracing information
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Checking the power supply to relay base terminal 2
- Ignition on.
- Blower fan at low-speed.
- Air conditioning (A/C) relay disconnected.
- Connect a voltmeter between relay base terminal 2 and ground.
The voltmeter should read battery voltage.
OK - Checking air conditioning (A/C) relay
Not OK - Fault-tracing information
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Fault-tracing information
- 1. the car has ECC.
- 2. the car has MCC.
Select one of the above alternatives.
Continue - Checking for an open-circuit
Continue - Checking the power supply from the blower fan switch
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Checking for an open-circuit
- check cable between air conditioning (A/C) relay terminal 2 and ECC control module (4/30) #B11 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Fault-tracing information
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Checking air conditioning (A/C) relay
- Ignition off.
- Connect air conditioning (A/C) relay.
- Ignition on.
- Air conditioning (A/C) switch on.
- Blower fan at low-speed.
- Start the engine and idle it.
- Connect a voltmeter between the underside of relay base (2/22) terminal 3 and ground.
The voltmeter should read battery voltage.
OK - Checking the power supply to the pressure switch (Pressostat)
Not OK - Fault-tracing information
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Fault-tracing information
- Try a new air conditioning (A/C) relay.
Continue - Fault-tracing information
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Checking the power supply from the blower fan switch
- Ignition off.
- Remove heater controls.
- Blower fan at low-speed.
- Ignition on.
- Connect a voltmeter between blower fan switch terminal B1 and ground.
The voltmeter should read battery voltage.
OK - Checking for an open-circuit
Not OK - Checking the voltage supply to the blower fan switch
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Checking for an open-circuit
- check cable between blower fan switch terminal B1 and air conditioning (A/C) relay terminal 2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Fault-tracing information
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Checking the voltage supply to the blower fan switch
- Ignition on.
- Connect a voltmeter between blower fan switch terminal A4 and ground.
The voltmeter should read battery voltage.
OK - Fault-tracing information
Not OK - Checking for an open-circuit
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Fault-tracing information
- Try a new blower fan switch.
Continue - Fault-tracing information
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Checking for an open-circuit
- Check cable between fuse 31 and blower fan switch terminal A4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Fault-tracing information
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Checking the power supply to the pressure switch (Pressostat)
- Ignition off.
- Disconnect the pressure switch (Pressostat) (7/53) connector.
- Blower fan at low-speed.
- Air conditioning (A/C) switch on.
- Start engine.
- Connect a voltmeter between pressure switch (Pressostat) terminal 1 and ground.
The voltmeter should read battery voltage.
OK - Checking the pressure switch (Pressostat) resistance
Not OK - Checking for an open-circuit
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Checking for an open-circuit
- Check cable between relay (2/22) terminal 3 and pressure switch (Pressostat) (7/53) terminal 1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Fault-tracing information
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Checking the pressure switch (Pressostat) resistance
- Ignition off.
- Pressure switch (Pressostat) disconnected.
- Connect an ohmmeter across both pressure switch (Pressostat) terminals.
The ohmmeter should read approximately 0 ohms.
OK - Checking for an open-circuit
Not OK - Fault-tracing information
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Checking for an open-circuit
- check cable between pressure switch (Pressostat) (7/53) terminal 2 and compressor (8/3) connector for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Fault-tracing information
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Fault-tracing information
- Check pressure in air conditioning (A/C) system.
Continue - Fault-tracing information
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Checking the power supply to the compressor
- Ignition off.
- Disassemble the 1-pin compressor connector.
Connect an ohmmeter between the cylinder block and the connector (compressor side).
- The ohmmeter reads approximately 0 ohms. Select 1.
- The ohmmeter reads 2-5 ohms: Select 2.
- The ohmmeter reads infinite resistance. Select 3.
Select a suitable alternative.
1 - Fault-tracing information
2 - Checking for an open-circuit
3 - Fault-tracing information
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Fault-tracing information
- the compressor clutch is faulty, replace clutch.
Continue - Fault-tracing information
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Checking for an open-circuit
- check cable between pressure switch (Pressostat) (7/53) terminal 2 and compressor connector for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Fault-tracing information
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Fault-tracing information
- Defective thermoswitch or compressor clutch. Remedy as necessary.
Continue - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
Fault-tracing shows that the fault is no longer present. The diagnostic trouble code (DTC) was probably caused by an intermittent fault.
Fault-tracing for this diagnostic trouble code is not followed by a verification.
You can view the information again or exit fault-tracing for this diagnostic trouble code (DTC).
Do you want to view information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Introductory check
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