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Toyota Corolla Repair Manual: Coolant thermostat (coolant temperature below thermostat regulating temperature)

Toyota Corolla Repair Manual / Diagnostics / Sfi system / Coolant thermostat (coolant temperature below thermostat regulating temperature)

Dtc p0128 coolant thermostat (coolant temperature below thermostat regulating temperature)

Hint

: this is the purpose of the ”thermostat” malfunction detection.

Inspection procedure
Hint: if dtcs p0115, p0116, p0117, p0118 and p0125 are output simultaneously, the engine coolant temperature sensor circuit may be open or short. Perform the troubleshooting of dtc p0115, ...

Circuit description
If the engine coolant temperature (ect) does not reach 75°c (167°f) despite sufficient warm – up time has elapsed. Dtc no Dtc detection condition Trouble area P01 ...

Other materials:

Changing the engine switch positions
1 “LOCK” The steering wheel is locked and the key can be removed. (Vehicles with an automatic transmission or continuously variable transmission: The key can be removed only when the shift lever is in P.) 2 “ACC” Some electrical components such as the audio system can be used. 3 “ON” All ele ...

Inspection procedure
Hint: read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the ...

Vehicle control system
Ignition or starter switch assy Replacement 1. Remove steering column cover 2. Remove ignition or starter switch assy Disconnect the ignition switch connector and unlock warning switch connector.  remove the 2 clamps.  remove the 2 screws and ignition switch. Inspectio ...

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