HINO 600 Series P0071 Outside Temperature Sensor Error Repair Guide

This instruction show you guide on how to diagnostics and repair HINO 600 series trucks P0071 outside temperature sensor trouble.

 

Preparations:

2022 HINO Diagnostic Explorer DX2 Diagnostic Software Free Download

 

Procedures:

Step 1:Inspect the ambient air temperature sensor connector

Check the connection of the ambient air temperature sensor connector (Looseness and poor contact).

HINO-600-Series-P0071-Outside-Temperature-Sensor-Error-Repair-Guide-1

Was any failure found?

Yes,connect securely,repair if needed.Perform “After-inspection work” of information section

No,go to Step 2

 

Step 2:Inspect the connector of the external resistor

Check the connection of the external resistor connector (Looseness and poor contact).

Was any failure found?

Yes,connect securely,repair if needed.Perform “After-inspection work” of information section

No,go to step 3

 

Step 3:Inspect the DCU 86P connector

Check the connection of the DCU 86P connector (Looseness and poor contact).

Was any failure found?

Yes,connect securely,repair if needed.Perform “After-inspection work” of information section

No,go to step 4

 

Step 4:Inspect the ambient air temperature sensor

1.Check the installation of the ambient air temperature sensor.

2.Make sure there is no dirt or damage to the ambient air temperature sensor.

Was any failure found?

Yes,clean the ambient air temperature sensor and install it properly.If damaged,replace the ambient air temperature.Perform “After-inspection work” of information section

No,go to step 5

 

Step 5:Inspect the ambient air temperature sensor unit

1.Set the starter switch to the “LOCK” position.

2.Disconnect the ambient air temperature sensor connector.

3.Use the electrical tester to measure the resistance between the terminals of the ambient air temperature sensor.

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Measuring condition:Starter switch:LOCK

Measurement area:Ambient air temperature sensor HH1+-HH1-

Standard value:25°C[1.7KΩ]

Do the measurements meet the standard value?

Yes,Go to step 6

No,replace the ambient air temperature sensor.Perform “After-inspection work” of information section

 

Step 6:Inspect the external resistor unit

1.Disconnect the external resistor connector.

2.Use the electrical tester to measure the resistance between the terminals of the external resistor.

HINO-600-Series-P0071-Outside-Temperature-Sensor-Error-Repair-Guide-3

Measuring condition:Starter switch:LOCK

Measurement area:External resistor ER+-ER-

Standard value:2KΩ

Do the measurements meet the standard value?

Yes,go to step 7

No,replace the external resistor.Perform “After-inspection work” of information section

 

Step 7:Inspect the sensor power supply

1.Connect the external resistor connector.

2.Set the starter switch to the “ON” position.

3.Use the electrical tester to measure the voltage between the terminals of the ambient air temperature sensor vehicle-side connector.

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Measuring condition:Starter switch:ON

Measurement area:Ambient air temperature sensor vehicle-side connector HH1+-HH1-

Standard value:4.5-5.5V

 

Step 8:Inspect for short-circuit in the ambient air temperature sensor harness

1.Set the starter switch to the “LOCK” position.

2.Disconnect the DCU 86P connector.

3.Connect the signal check harness and use the electrical tester to measure the resistance between the terminals of the DCU 86P vehicle-side connector and the ground.

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Measuring condition:Starter switch:LOCK

Measurement area:DCU 86P vehicle-side connector,ATSS-Ground,ATS–Ground

Standard value:∞Ω

Do the measurements meet the standard value?

Yes,go to step 9

No,repair or replace the harness.Perform “After-inspection work” of information section

 

Step 9:Inspect for disconnections of the ambient air temperature sensor harness

1.Connect the ambient air temperature sensor connector.

2.Connect the signal check harness and use the electrical tester to measure the resistance between the terminals of the DCU 86P vehicle-side connector.

HINO-600-Series-P0071-Outside-Temperature-Sensor-Error-Repair-Guide-6

Measuring condition:Starter switch:LOCK

Measurement area:DCU 86P vehicle-side connector,ATSS-,ATS-

Standard value:25°C[3.7KΩ]

Yes,go to step 10

No,repair or replace the harness.Perform “After-inspection work” of information section

 

Step 10:Inspect the engine coolant temperature sensor connector

Check the connection of the engine coolant temperature sensor connector (Looseness and poor contact).

Was any failure found?

Yes,connect securely,repair if needed.Perform “After-inspection work” of information section

No,go to step 11

 

Step 11:Inspect the engine coolant temperature sensor

1.Check the installation of the engine coolant temperature sensor.

2.Make sure there is no dirt or damage to the engine coolant temperature sensor.

Was any failure found?

Yes,clean the engine coolant temperature sensor and install it properly.If damaged,replace the engine coolant temperature sensor.Perform “After-inspection work” of information section

No,go to step 12

 

Step 12:Inspect the engine coolant temperature sensor unit

1.Disconnect the engine coolant temperature sensor connector.

2.Use the electrical tester to measure the resistance between the terminals of the engine coolant temperature sensor.

Measuring condition:Starter switch:LOCK

Measurement area:Engine coolant temperature sensor WTM+-WTM-

Standard value:20°C[2.59-2.32KΩ],80°C[0.326-0.310KΩ]

Do the measurements meet the standard value?

Yes,go to step 13

No,replace the engine coolant temperature sensor.Perform “After-inspection work” of information section

HINO-600-Series-P0071-Outside-Temperature-Sensor-Error-Repair-Guide-7

 

Step 13:Inspect the exhaust gas temperature sensor (SCR inlet) connector

Check the connection of the exhaust gas temperature sensor (SCR inlet) connector (Looseness and poor contact).

Was any failure found?

Yes,connect securely,repair if needed.Perform “After-inspection work” of information section

No,go to step 14

 

Step 14:Inspect the exhaust gas temperature sensor (SCR inlet)

Check the installation of the exhaust gas temperature sensor (SCR inlet).

Make sure there is no dirt or damage to the exhaust gas temperature sensor (SCR inlet).

Was any failure found?

Yes,clean the exhaust gas temperature sensor and install it properly.If damaged,replace the exhaust gas temperature sensor (SCR inlet).Perform “After-inspection work” of information section.

No,go to step 15

 

Step 15:Inspect the exhaust gas temperature sensor (SCR inlet) unit

1.Set the starter switch to the “LOCK” position.

2.Disconnect the exhaust gas temperature sensor (SCR inlet) connector.

3.Use the electrical tester to measure the resistance between the terminals of the exhaust gas temperature sensor (SCR inlet).

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Measuring condition:Starter switch:LOCK

Measurement area:Exhaust gas temperature sensor (SCR inlet) FAT+-FAT-

Standard value:20°C[220Ω]

Do the measurements meet the standard value?

Yes,go to step 16

No,repair or replace exhaust gas temperature sensor.Perform “After-inspection work” of information section.

 

Step 16:Inspect the DEF pump temperature sensor connector

Check the connection of the DEF pump temperature sensor connector (Looseness and poor contact).

Was any failure found?

Yes,connect securely,repair if needed.Perform “After-inspection work” of information section

No,go to Step 17

 

Step 17:Check the DTC detected(DCU) with HINO DX2

1.Perform an engine warm-up. (Water temperature: 60 °C {140 °F} or more)

2.Stop the engine.

3.Set the starter switch to the “ON” position.

4.Select [DCU] and check if P0071 has been detected.

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Has DTC P0071 been detected?

Yes,replace the DCU.Perform “After-inspection work” of information section

No,procedure completed.Perform “After-inspection work” of information section

 

More case for HINO please refer to:HINO Trouble Repair.

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