Коды DX12 E6 TATA Daewoo - Автозапчасти и автоХитрости

1. Fault code definition

2. Torque reduction by fault

3. Torque reduction by Coolant / Fuel / Inlet air temperature

4. Electric fault troubleshooting guide tip

5. Fault list summary

6. Troubleshooting guide

Each monitored parameter that uses the de-rate function has its own de-rate trigger threshold. If the

de-rate threshold is equal to or exceeded by any parameter for a de-rate protection will be set active, the engine will de-rate.

Each application has different engine full load. So following is the picture showing some example of

engine torque de-rates.

1) Torque reduction levell (Mild) - The maximum engine torque is limited by 70% of machine full load curve.

2) Torque reduction level2 (Severe) - The maximum engine torque is limited by 50% of machine full load curve.

If the engine coolant temperature over the 110degC, the engine torque will be reduced progressively

If the engine fuel temperature at High pressure pump inlet(Fuel filter) over the 80degC, the engine

torque will be reduced progressively

If the engine is on the high ambient temperature, the engine torque will be reduced progressively for

anti-fouling of turbocharger.

Electronic problems can be caused by many causes. Therefore, it is not possible to list all the causes,

but it is usually necessary to check the following items.

1) Check the battery

A. check Terminal tightening.

B. check absence of oxidation

C. check absence of consumers

- Check if there is any device that is not supplied by the engine or machine company capable of generating dark current installed.

D. check battery capacity

E. check battery external damage

2) Check part's connection (ECU, VCU, sensor etc.)

A. check pin condition (bending, broken, breakaway)

B. check terminal condition (widening, broken, breakaway)

C. check absence of oxidation

D. check absence of contains water

E. check external damage

F. check looseness of assembly connection

- Except some specific sensors(CAM, Crank, etc...), ECU can diagnosis the open circuit at Key on condition. Check if the open circuit fault is occurred due to contact failure when the wiring harness is wiggled by hands.

G. check cross-connect with another sensor

3) check sensor resistance

A. Resistance type sensor only (for example temperature sensor)

B. remove sensor connector and check sensor itself resistance

- refer each resistance information

4) Check wire harness

A. check pin to pin. (sensor connector to ECU connector)

5) Check Network

A. check the service tool connect ability

B. resistance of CAN high and CAN low (CAN line has 120ohm resistors at both ends)

C. check voltage by 2 channel oscilloscope

- CAN High and CAN low signal are balanced when one is up, the other is down.

- CAN High signal is 2.5~3.5V and CAN Low signal is 1.5~2.5V

* For the CAN pin number, refer to the Diagnostic connector.

6) Check CAM CRANK (Oscilloscope)

A. Preparing oscilloscope and Insulation piercing clip

i. Oscilloscope setting

1. Sampling interval: 2MHz, input signal voltage +/- 30V

2. Channel : at least 2 channel (CAM and CRANK)

ii. Oscilloscope and Probe (example)

B. Check the CAM and CRANK sensor location and Pin information

C. Installation step

1. Remove the connection cover

2. Install the piercing clip (CAM and CRANK)

3. Connect probe each clip

D. Measuring step

1. Measuring CAM and CRANK signal at same time Example)

2. Inspection the signal (focus at CRANK signal tooth depend on CAM rising edge and falling edge)

Example)

1) Overview

2) Component Location

The sensor is not specifically positioned (usually located around the supply module and DEF supply line).

3) Condition for Running Diagnostic

Key ON or Engine running

4) Condition for Setting the Fault Code

If Environment temperature is greater than 130°C for 0.5 second.

5) Condition for Clearing the Fault Code

If Environment temperature is less than or equal to 130 C for 0.05 second.

P0072 Low voltage error for environment temperature sensor

1) Overview

2) Component Location

The sensor is not specifically positioned (usually located around the supply module and DEF supply line).

3) Condition for Running Diagnostic

Key ON or Engine running

4) Condition for Setting the Fault Code

If Environment temperature sensor voltage is less than 200 mV for 0.05 second,

5) Condition for Clearing the Fault Code

If Environment temperature sensor raw voltage is greater than or equal to 200 mV for 0.05 second,

P0073 High voltage error for environment temperature sensor

1) Overview

2) Component Location

The sensor is not specifically positioned (usually located around the supply module and DEF supply line).

3) Condition for Running Diagnostic

4) Condition for Setting the Fault Code

5) Condition for Clearing the Fault Code

If Environment temperature sensor voltage is less than or equal to 4900 mV for 0.05 second,

6) Check List

P0087 Rail pressure below minimum limit error

1) Overview

2) Component Location

3) Condition for Running Diagnostic Engine running

4) Condition for Setting the Fault Code If Rail pressure (RailP_pFlt) is less than 200 bar for 2.5 seconds,

5) Condition for Clearing the Fault Code If Rail pressure is operating normally.

The fault code is not cleared at the current driving cycle once occurred.

At the next driving cycle, with no condition of setting the fault code achieved, the fault will become a historical one to be cleared.

6) Check List