Mazda CX-9 Grand Touring. Manual — part 341
NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI-3.7]
NO.17 COOLING SYSTEM CONCERNS-OVERHEATING (MZI-3.7) DETECTION CONDITIONS
AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
NO.17 COOLING SYSTEM CONCERNS-OVERHEATING (MZI-3.7) DIAGNOSTIC PROCEDURE
3
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information is not available,
replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
17
COOLING SYSTEM CONCERNS-OVERHEATING
DESCRIPTION
Engine runs at higher than normal temperature/overheats.
POSSIBLE CAUSE
Improper coolant level
Blown fuses
Coolant leakage
Excessive A/C system pressure
A/C system operation is improper
Improper water/anti-freeze mixture
Fans reverse rotation
Poor radiator condition
Thermostat malfunction
Radiator hoses damage
Improper or damaged radiator cap
Cooling fan is inoperative.
Coolant overflow system malfunction
Improper tension of drive belt
Drive belt damage
STEP
INSPECTION
RESULTS
ACTION
Inspect the following:
Engine coolant level
Coolant leakage
Water and anti-freeze mixture
Radiator condition
Yes
Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
Page 70
© 2005 Mitchell Repair Information Company, LLC.
1
Collapsed or restricted radiator
hoses
Radiator pressure cap
Overflow system
Fan rotational direction
Fuses
Are all items normal?
No
Service if necessary.
Repeat Step 1.
2
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON
position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [MZI-3.7] .)
No
No DTC is displayed:
Go to the next step.
3
Start the engine and idle it.
Turn the A/C switch on and set blower fan
to any speed.
Does the A/C compressor engage?
Yes
Go to Step 5.
No
Inspect for the following and repair or
replace if necessary:
Refrigerant charging amount
Open circuit in wiring harness
between A/C relay and PCM
terminal 1N
Seized A/C magnetic clutch
A/C magnetic clutch malfunction
If all items are normal, go to the next step.
4
Connect the M-MDS to the DLC-2.
Access AC_REQ PID.
Start the engine and idle it.
Turn the A/C switch and fan switch on.
Does AC_REQ PID read on?
Yes
Go to the next step.
No
Inspect the following:
Refrigerant pressure switch
operation
The A/C switch is stuck open.
Open or short circuit between
refrigerant pressure switch and PCM
terminal 1R
Open circuit of blower motor fan
switch and resistor (if blower motor
does not operate)
The evaporator temperature sensor
and A/C amplifier
Inspect cooling fan control system
operation.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
Page 71
© 2005 Mitchell Repair Information Company, LLC.
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [MZI-3.7]
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD (MZI-3.7) DETECTION CONDITIONS AND
POSSIBLE CAUSES
5
(See ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.7].)
Does the cooling fan control system
function properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part.
6
Is the drive belt normal?
Yes
Go to the next step.
No
Replace the drive belt.
7
Is there leakage around the heater unit in
passenger compartment?
Yes
Inspect and service heater for leakage.
No
Go to the next step.
8
Is there leakage at the coolant hoses and/or
radiator?
Yes
Replace the malfunctioning part.
No
Go to the next step.
9
Cool down the engine.
Remove thermostat and inspect operation.
(See THERMOSTAT
REMOVAL/INSTALLATION [MZI-
3.7] .)
(See THERMOSTAT INSPECTION
[MZI-3.7] .)
Is thermostat normal?
Yes
The engine coolant temperature and
thermostat are normal, inspect engine
block for leakage or blockage.
No
Access ECT PID.
Inspect for both ECT PID and temperature
gauge readings.
If temperature gauge on instrument cluster
indicates normal range but ECT PID is not
same as temperature gauge reading, inspect
CHT sensor.
If temperature gauge on instrument cluster
indicates overheating but ECT PID is
normal, inspect temperature gauge and heat
gauge unit.
10
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].)
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information is not available,
replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
18
COOLING SYSTEM CONCERNS-RUNS COLD
DESCRIPTION
Engine takes excessive time to reach normal operating temperature.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
Page 72
© 2005 Mitchell Repair Information Company, LLC.
DIAGNOSTIC PROCEDURE
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD (MZI-3.7) DIAGNOSTIC PROCEDURE
POSSIBLE CAUSE
Thermostat malfunction
Cooling fan system malfunction
STEP
INSPECTION
RESULTS
ACTION
1
Is customer complaint "Lack of passenger
compartment heat" only?
Yes
Inspect A/C and heater system.
No
Go to the next step.
2
Does the engine speed continue at fast
idle?
Yes
Go to symptom troubleshooting "No.9 Fast
idle/runs on".
(See NO.9 FAST IDLE/RUNS ON [MZI-
3.7].)
No
Go to the next step.
3
Remove the thermostat and inspect
operation.
(See THERMOSTAT
REMOVAL/INSTALLATION [MZI-
3.7] .)
(See THERMOSTAT INSPECTION
[MZI-3.7] .)
Is thermostat normal?
Yes
Go to the next step.
No
Replace the thermostat.
4
Inspect cooling fan control system
operation.
(See ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.7].)
Does the cooling fan control system
function properly?
Yes
Access ECT PID.
Inspect for both ECT PID and temperature
gauge on instrument cluster readings.
If the temperature gauge on the instrument
cluster indicates normal range but ECT PID
is not the same as temperature gauge
reading, inspect the CHT sensor.
If the temperature gauge on the instrument
cluster indicates cold range but ECT PID is
normal, inspect the temperature gauge and
heat gauge unit.
No
Repair or replace the malfunctioning part.
5
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].)
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information is not available,
replace PCM.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
Page 73
© 2005 Mitchell Repair Information Company, LLC.
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