DTC P0428 Exhaust Gas Temperature (EGT) Sensor 1 Circuit High (4JJ3 with DPD)

1. DTC P0428 description

Exhaust gas temperature sensor 1 (front of DPD filter) is installed at the inlet of the DPD filter. Exhaust gas temperature sensor 1 (front of DPD filter) is a variable resistor and measures the exhaust gas temperature in front of the DPD filter. This sensor has a signal circuit and a low reference circuit. The ECM supplies 5 V to the signal circuit and connects the ground to the low reference circuit. When the exhaust gas temperature is low, the sensor resistance is high, and the higher the exhaust gas temperature becomes, the lower the sensor resistance. The ECM detects a high voltage when the sensor resistance is high, and a low voltage when the sensor resistance is low. If the ECM detects an excessively high signal voltage, the DTC is set.

2. Condition for setting DTC P0428

Condition for running the DTC

The battery voltage is 9 to 16 V.
The ignition switch is ON.
10 minutes or more have passed since the last DPD regeneration.
DTCs P0112, P0113, P060B, and P06A3 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0112 Intake Air Temperature Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0113 Intake Air Temperature Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P060B Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P06A3 Sensor Reference Voltage 4 Circuit".

Also, the following are met for the predetermined time or more:

The engine coolant temperature is 75°C {167°F} or more.
The engine speed is 1,200 rpm or more.
The fuel flow is 10 mm3/st or more.
The barometric pressure is 60 kPa {9 psi} or more.
Exhaust Gas Temperature 1 is more than or equal to the predetermined value.

Condition for setting the DTC

The ECM detects that the Exhaust gas temperature sensor 1 (front of DPD filter) signal voltage is 4.9 V or more for 3 seconds.

3. Action taken when DTC P0428 sets

The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".

The ECM limits the fuel injection quantity.
The ECM inhibits the EGR control.
The ECM inhibits the DPD regeneration.
The ECM inhibits the cruise control.
The ECM assumes a default Exhaust gas temperature sensor 1 (front of DPD filter) value.

4. Condition for clearing DTC P0428

Refer to Conditions for clearing the MIL/DTC - Type A or Type B.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".