DTC Description

DTC DETECTION LOGIC

DTC		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
P0127	00	IAT SENSOR-B1 (Intake air temperature too high)	Diagnosis condition	—
			Signal (terminal)	Intake air temperature sensor signal
			Threshold	When the amount of intake air is sufficient, the temperature sent from IAT is more than 90°C (194°F).
			Diagnosis delay time	—

POSSIBLE CAUSE

Harness or connectors (The IAT sensor circuit is open or shorted.)
Intake air temperature sensor

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

2.PERFORM DTC CONFIRMATION PROCEDURE

With M.U.T.-III SE

Wait until engine coolant temperature is less than 96°C (205°F)
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE.
3. Check the engine coolant temperature.
4. If the engine coolant temperature is not less than 96°C (205°F), turn ignition switch OFF and cool down engine.
  note Perform the following steps before engine coolant temperature is above 96°C (205°F).
Turn ignition switch ON.
Select “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE
Start engine.
Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
caution Always drive vehicle at a safe speed.
Check 1st trip DTC.

With GST

Follow the procedure “With M.U.T.-III SE” above.

Is 1st trip DTC detected?

Proceed to DTC Diagnosis Procedure

-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident

-2Confirmation after repair: INSPECTION END