Toyota Corolla (E120): Circuit description
If the engine coolant temperature (ect) does not reach 75°c (167°f) despite sufficient warm – up time has elapsed.
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Dtc no |
Dtc detection condition |
Trouble area |
| P0128 | Condition (a), (b) and (c):
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Monitor description
The ecm estimates the engine coolant temperature (ect) based on starting temperature, engine loads, and engine speeds. The ecm then compares the estimated ect with the actual ect. When the estimated ect reaches 75 c (167 f) the ecm checks the actual ect. If the actual ect is less than 75 c (167 f), the ecm will interpret this as a fault in the thermostat or engine cooling system or thermostat and set a dtc.
Monitor strategy
Typical enabling conditions
Typical malfunction thresholds
Component operating range
Monitor result (mode 06 data)
Refer to page 05–27 for the detailed information on checking monitor status.
Other materials:
On–vehicle inspection
1. Check basic function (manual operation function)
turn the ignition switch on.
Check that the door glass moves up when each window switch of the
regulator master switch
assembly is turned up and moves down when each window switch is turned down.
Check that the do ...
Under hood
General maintenance
1. General notes
maintenance requirements vary depending on the country.
Check the maintenance schedule in the owner’s manual supplement.
Following the maintenance schedule is mandatory.
Determine the appropriate time to service the vehicle using either miles
driv ...
Inspection procedure
1 Check voltage at ig2 of airbag sensor assy center
Disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
disconnect the connector of the airbag sensor assy center.
connect the negative (–) terminal cable to the battery,
and wa ...