Mazda CX-7 2007 Workshop Manual page 1139

STEP
17 INSPECT TO SEE WHETHER MALFUNCTION
IS IN EXPANSION VALVE OR ELSEWHERE
• Is only refrigerant low-pressure value high?
18 VERIFY THAT AIR MIX IS INSTALLED
SECURELY AND PROPERLY
• Are the A/C unit air mix links, air mix cranks,
and air mix rods securely and properly
installed?
19 VERIFY THAT EXPANSION VALVE HEAT-
SENSING TUBE WITHIN A/C UNIT IS
POSITIONED SECURELY AND CORRECTLY
• Is the expansion valve heat-sensing tube in
the A/C unit securely installed in the proper
position?
20 VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR
• Does cool air blow out? (Are results of
refrigerant system performance test
normal?)
End Of Sie
NO.8 NO COOL AIR
8 No cool air
• Magnetic clutch does not operate.
DESCRIPTION
• Malfunction in PCM A/C cut control system
• Malfunction in climate control unit
• Malfunction in refrigerant pressure switch
• Malfunction in PCM (A/C signal)
• Malfunction in PCM (IG1 signal)
POSSIBLE
• Malfunction in A/C compressor
CAUSE
• Malfunction in A/C relay
• Malfunction in evaporator temperature sensor
• Malfunction in BCM unit (Manual A/C)
• Malfunction in CAN communication
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
performing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are
connected correctly and undamaged.
Diagnostic procedure
STEP
1 INSPECT AIR BLOW OUT
• Does air blow out?
2 INSPECT A/C COMPRESSOR OPERATION
• Start engine.
• Turn A/C switch and airflow volume control
dial on.
• Does A/C compressor operate?
2007 Mazda CX-7 Workshop Manual (1871–1U–06B)
SYMPTOM TROUBLESHOOTING
INSPECTION
INSPECTION
Yes Go to Step 19.
No Go to the next step.
Yes Set the airflow volume control dial to 4th position.
Turn the A/C switch on.
Set FRESH mode.
Set temperature control to MAX COLD.
Set VENT mode.
(1)Start and run the engine at 1,500 rpm for 10 min.
(2)Run the engine at idle for 1 min.
(3)Within 12 s, idle → 4,000 rpm → idle. Perform cycle 5
times.
(4) Run the engine at idle for 30 s.
(5)Drain the compressor oil completely from the A/C
compressor and verify the amount.
• If there is approx. 90 ml {90 cc, 3.0 fl oz} of
compressor oil, go to Step 20.
• If there is more than 90 ml {90 cc, 3.0 fl oz} of
compressor oil, remove surplus oil and fill the A/C
compressor with 90 ml {90 cc, 3.0 fl oz} of
compressor oil. Repeat Steps (1) to (5).
(Cause is excessive amount of compressor oil.)
No Repair or install the links, cranks and rods securely in the
proper position, then go to Step 20.
Yes Replace the expansion valve, then go to the next step.
(Since the valve opens too much, replacement is
necessary.)
No Install the heat-sensing tube securely in the proper position,
then go to the next step.
Yes Troubleshooting completed.
Explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if
the malfunction recurs.
Yes Go to the next step.
No Go to Step 1 of troubleshooting indexes No.1 and 2.
Yes Go to Step 1 of troubleshooting index No.7.
No Go to the next step.
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