Cel P0128

[silverpro5]

Hey, stopped by AutoZone today to get this CEL code. My coolant levels are good, so I assume this means I need a new thermostat? Anyone have any experience w/ this CEL and replacing the thermostat? I have a 2002 w/ 100k on it.

 

[silverpro5]

huh, no one?

 

[Nutari]

(search) (copy paste)

DTC P0126

DTC P0128 Coolant thermostat stuck to open

DETECTION

CONDITION
DTC P0126

If ECT signal never exceeds 71C {160F} after engine start for specified period, PCM determines that the

coolant thermostat is stuck open.

MONITORING CONDITIONS
IAT:
Above -10C {14F}

Difference between ECT at engine start and minimum IAT:
Below 6C {43F}

Vehicle speed
over 9.5 km/h {5.9 mph}

DTC P0128

PCM monitors MAF, IAT, VSS and ECT signals and calculate radiator's heat radiation ratio while following

monitoring conditions are met. If calculated value exceeds threshold, PCM determines that the coolant

thermostat is stuck open.

MONITORING CONDITIONS
ECT at engine start:
Below 35C {95F}

IAT:
Above -10C {14F}

Difference between ECT at engine start and minimum IAT:
Below 6C {43F}

Vehicle speed
above 25 km/h {15 mph} for ATX, 40 km/h {25 mph} for MTX

Diagnostic support note

This is a intermittent monitor (THERMOSTAT)


MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles.


DIAGNOSTIC MONITORING TEST RESULTS is available.


PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.


FREEZE FRAME DATA is available.


DTC is stored in PCM memory.

POSSIBLE

CAUSE

Coolant thermostat malfunction


ECT sensor malfunction


PCM malfunction

 

[Nutari]

from thread..

http://www.mazdas247.com/forum/showthread.php?t=123619055&highlight=p0128

 

[silverpro5]

I tried the search. Obviously I'm desperately noobish

thanks

 

[Nutari]

I tried the search. Obviously I'm desperately noobish

thanks

no problem.

I searched for just

p0128

it was the third or so thread down.