P0125

DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL

1. OUTLINE OF DIAGNOSIS
Detect the malfunction of engine coolant temperature output property.
Judge as NG when the engine coolant temperature does not rise in driving conditions where it should.

2. COMPONENT DESCRIPTION






3. ENABLE CONDITION










4. GENERAL DRIVING CYCLE
Perform the diagnosis only once after engine start.

5. DIAGNOSTIC METHOD

Abnormality Judgment
Judge as NG if the criteria below are met.






Timer for diagnosis after engine start
a. Timer stop at fuel cut
b. During the driving conditions except a) above, timer counts up as follows.
64 ms + TWCNT ms (when at 64 ms)
TWCNT is defined as follows,
TWCNT = 0 at idle switch ON,
TWCNT show on the following table at idle switch OFF.






Judgment value of timer after engine starting
t = 451056 ms - 25870 ms x Ti
Ti : The lowest coolant temperature after engine start

Time Needed for Diagnosis: Less than 1 second
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are met.






Time Needed for Diagnosis: Less than 1 second