DTC P0128 [MZI-3.5]
DTC P0128 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DTC P0128 (MZI-3.5) DIAGNOSTIC PROCEDURE
(See
AFTER REPAIR
PROCEDURE [MZI-3.5]
.)
z
Are any DTCs present?
No
Troubleshooting completed.
DTC P0128
Coolant thermostat (coolant temp below thermostat regulating temperature)
DETECTION
CONDITION
z
P0128 Indicates that the thermostat monitor has not achieved the required
engine operating temperature within a specified amount of time after
starting the engine.
POSSIBLE CAUSE
z
Insufficient warm up time
z
Low engine coolant level
z
Leaking or stuck open thermostat
z
Inoperative cylinder head temperature (CHT) sensor
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED
z
Has FREEZE FRAME DATA
been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on the
repair order, then go to the next step.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
z
Verify related Service Bulletins
and/or on-line repair information
availability.
z
Is any related Service Bulletins
available?
Yes
Perform repair or diagnosis according to
the available Service Bulletins.
z
If the vehicle is not repaired, go to
the next step.
No
Go to the next step.
3
INSPECT ENGINE COOLANT
LEVEL
WARNING:
z
Never remove the cooling
system cap or loosen the
radiator drain plug while the
engine is running, or when the
engine and radiator are hot.
Yes
Go to the next step.
No
Inspect for a loss of engine coolant. Repair
if necessary.
(see
ENGINE COOLANT LEAKAGE
INSPECTION [MZI-3.5]
.)
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:30 AM
Page 83
© 2005 Mitchell Repair Information Company, LLC.