Toyota Tacoma manuals

Toyota Corolla Repair Manual: Circuit description

Refer to dtc p0115

Dtc no.

Dtc detection condition

Trouble area

P0125 If the engine coolant temperature (ect) was less than 6.6 C (20 F) when starting the engine, and 20 minutes after the engine start, the ect sensor still indicates below 20 C (68 F)
  • Cooling system
  • engine coolant temperature sensor
  • thermostat
If the ect was between 6.6 C (20 F) and 10 C (50 F) when start, 5 minutes after the start, the ect sensor still indicates below 20 C (68 F)
If the ect was greater than 10 C (50 F) when starting the engine, and 2 minutes after the engine start, ect sensor still indicates below 20 C (68 F)

Monitor description

The engine coolant temperature (ect) sensor is used to monitor the temperature of the engine coolant. The resistance of the sensor varies with the actual coolant temperature. The ecm applies a voltage to the sensor and the varying resistance of the sensor causes the signal voltage to vary. The ecm monitors the ect signal voltage after engine startup. If, after sufficient time has passed, the sensor still reports that the engine is not warm enough for closedloop fuel control, the ecm interprets this as a fault in the sensor or cooling system.

Example: the engine coolant temperature was 0 c (32 f) at engine start. After 5 minutes running time, the coolant temperature sensor still indicates that the engine is not warm enough to begin airfuel ratio feedback control.

The ecm interprets this as a fault in the sensor or cooling system and will set a dtc.

Monitor strategy

Typical enabling conditions

Typical enabling conditions

Typical malfunction thresholds

Typical malfunction thresholds

Wiring diagram

Wiring diagram

Refer to dtc p0115

Insufficient coolant temperature for closed loop fuel control
Dtc p0125 insufficient coolant temperature for closed loop fuel control ...

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, ...

Other materials:

Wireless remote control/electronic key battery
Replace the battery with a new one if it is depleted. You will need the following items: ● Flathead screwdriver ● Small flathead screwdriver ● Lithium battery CR2016 (vehicles without a smart key system), or CR2032 (vehicles with a smart key system) Replacing the battery &# ...

Bluetooth Audio (Multimedia system)
Listening to Bluetooth Audio The Bluetooth audio system enables the user to enjoy music played on a portable player from the vehicle speakers via wireless communication. When a Bluetooth device cannot be connected, check the connection status on the Bluetooth* Audio screen. If the device ...

Ecm/pcm processor
Dtc p0606 ecm/pcm processor Monitor description The ecm continuously monitors its internal circuits. This selfcheck insures that the ecm is functioning properly. If a malfunction is detected, the ecm will set the appropriate dtc and illuminate the mil. The two cpus, main and sub cpu ins ...

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