Home ReviewsRefund Car not listed?
Home/Volvo/V50/Volvo V50 I рестайлинг (2007-2012)/Repair manual/Testing & Diagnostics/Engine Control Module (ECM) Diagnostic Trouble Codes - 3 of…
Contents Section: Testing & Diagnostics All sections

Engine Control Module (ECM) Diagnostic Trouble Codes - 3 of 9: Diagnosis Volvo V50 I рестайлинг

Testing & Diagnostics 4 illustrations ~2100 words

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-2610

see DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-2610

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-261A

Condition

The engine control module (ECM) controls the fuel pressure via the fuel pump (FP) control module using a PWM signal. The fuel pump (FP) control module then controls the fuel pump (FP) depending on the pressure requested by the engine control module (ECM).

The diagnostic trouble code (DTC), signal too high/low, is stored if the actual pressure (measured by the fuel pressure sensor) becomes too high/low compared with the requested pressure (engine control module (ECM) target value) for a certain amount of time.

The diagnostic trouble code (DTC) (incorrect signal) is stored if the actual pressure varies/pulses too much.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value

  1. The fuel pump (FP) is controlled using a calculated value.

Possible Source

Signal too high

  1. Damaged fuel pressure sensor
  2. Damaged fuel pump (FP) control module.

Signal too low

  1. Leakage at the fuel lines
  2. Damaged fuel pressure sensor
  3. Damaged fuel pump
  4. Damaged fuel pump (FP) control module.

Faulty signal

  1. Air in the fuel lines
  2. Blocked fuel lines
  3. Damaged fuel pressure sensor
  4. Damaged fuel pump
  5. Damaged fuel pump (FP) control module.

Fault symptom[s]

  1. Malfunction indicator lamp (MIL) lit
  2. Deterioration in performance
  3. The engine stops.

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-261A

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-261A

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-270B

Condition

Scheme 58

Scheme 58: DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-270B
Scheme 58: DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-270B

The engine control module (ECM) checks the signal for engine coolant temperature (ECT).

As soon as the engine is started the temperature is calculated theoretically. The diagnostic trouble code (DTC) is stored if the calculated temperature exceeds the engine coolant temperature (ECT) sensor signal.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value

  1. Initial boost pressure
  2. The engine coolant temperature (ECT) is calculated based on a model. Three-way catalytic converter (TWC) heating and fuel trim at start (starting trim), idle diagnostic and misfire diagnostic are disabled
  3. The engine cooling fan (FC) runs at a predefined speed.

Possible Source

  1. Damaged temperature sensor
  2. Damaged coolant thermostat.

Fault symptom[s]

  1. Malfunction indicator lamp (MIL) lit
  2. The engine is difficult to start.

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-270B

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-273C

Condition

The engine control module (ECM) checks the signal for engine coolant temperature (ECT).

A diagnostic trouble code (DTC) is stored if the engine control module (ECM) receives a signal from the engine coolant temperature (ECT) sensor corresponding to a temperature that is higher than a certain value.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value

  1. Initial boost pressure
  2. The engine coolant temperature (ECT) is calculated based on a model. Three-way catalytic converter (TWC) heating and fuel trim at start (starting trim), idle diagnostic and misfire diagnostic are disabled
  3. The engine cooling fan (FC) runs at a predefined speed.

Possible Source

  1. Short-circuit to ground in the signal cable
  2. Damaged temperature sensor.

Fault symptom[s]

  1. Malfunction indicator lamp (MIL) lit
  2. The engine is difficult to start.

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-273C

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-273C

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-273D

Condition

The engine control module (ECM) checks the signal for engine coolant temperature (ECT).

A diagnostic trouble code (DTC) is stored if the engine control module (ECM) receives a signal from the engine coolant temperature (ECT) sensor corresponding to a temperature that is lower than a certain value.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value

  1. Initial boost pressure
  2. The engine coolant temperature (ECT) is calculated based on a model. Three-way catalytic converter (TWC) heating and fuel trim at start (starting trim), idle diagnostic and misfire diagnostic are disabled
  3. The engine cooling fan (FC) runs at a predefined speed.

Possible Source

  1. Contact resistance and oxidation in the terminals
  2. Open-circuit in the signal cable
  3. Open-circuit in the signal ground cable
  4. Short-circuit to supply voltage in the signal cable
  5. Damaged temperature sensor.

Fault symptom[s]

  1. Malfunction indicator lamp (MIL) lit
  2. The engine is difficult to start.

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-273D

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-273D

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-2740

Condition

The engine control module (ECM) checks the signal for engine coolant temperature (ECT).

After the engine is started, the engine control module (ECM) calculates the theoretical engine coolant temperature (ECT) based on factors such as time since start, engine speed (RPM) and load. The diagnostic trouble code (DTC) is stored if the signal from the engine coolant temperature (ECT) sensor is static and does not correspond to the calculated temperature.

The diagnostic trouble code (DTC) is stored together with another diagnostic trouble code (DTC) for the engine coolant temperature (ECT) sensor.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value

None

Possible Source

  1. Contact resistance and oxidation in the connectors
  2. Damaged temperature sensor.

Fault symptom[s]

  1. Malfunction indicator lamp (MIL) lit
  2. The engine is difficult to start.

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-2740

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-274C

Condition

Scheme 59

Scheme 59: DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-274C
Scheme 59: DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-274C

Engine Control Module (ECM) checks the signal for engine temperature. If the engine temperature (signal) exceeds a certain limit, the control module checks current operating condition and compares to a calculated engine temperature. Calculations are based on, among other things, speed and load. If the signal from the engine temperature sensor matches a temperature that is higher than a certain limit value and is not reduced within a certain time, the control module interprets this as a malfunction and the diagnostic trouble code (DTC) is generated.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value

  1. The engine coolant temperature (ECT) is calculated based on a model.

Possible Source

  1. Damaged engine coolant temperature (ECT) sensor.
  2. Contact resistance or oxidation in the terminals.
  3. Insufficient coolant in cooling system.
  4. Damaged thermostat.
  5. Clogged radiator.

Fault symptom[s]

  1. Malfunction indicator light (MIL), on
  2. Engine is difficult to start

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-274C

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-274D

Condition

The engine control module (ECM) checks the signal for engine coolant temperature (ECT).

After the engine is started, the engine control module (ECM) calculates the theoretical engine coolant temperature (ECT) based on factors such as time since start, engine speed (RPM) and load. The diagnostic trouble code (DTC) is stored if the signal from the engine coolant temperature (ECT) sensor is lower than the calculated temperature.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value

None.

Possible Source

  1. Contact resistance and oxidation in the connectors
  2. Damaged temperature sensor.

Fault symptom[s]

  1. Malfunction indicator lamp (MIL) lit
  2. The engine is difficult to start.

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-274D

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-275C

Condition

Engine Control Module (ECM) checks the signal for engine temperature at start. This is done by the control module saving the values from inlet, fuel and engine temperature sensors at the moment of start. Then the control module compares the values. If the signal from the engine temperature sensor matches a temperature that exceeds a certain limit in relation to the other, the control module interprets this as a malfunction and the diagnostic trouble code (DTC) is generated.

The diagnostic trouble code (DTC) can be diagnosed after approx. 10 minutes with the engine running.

Substitute Value

  1. The engine coolant temperature (ECT) is calculated based on a model.

Possible Source

  1. Damaged engine coolant temperature (ECT) sensor.
  2. Contact resistance or oxidation in the terminals.

Fault symptom[s]

  1. Malfunction indicator light (MIL), on
  2. Engine is difficult to start

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-275C

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-275D

Condition

Engine Control Module (ECM) checks the signal for engine temperature at start. This is done by the control module saving the values from inlet, fuel and engine temperature sensors at the moment of start. Then the control module compares the values. If the signal from the engine temperature sensor matches a temperature that is below a certain limit in relation to the other, the control module interprets this as a malfunction and the diagnostic trouble code (DTC) is generated.

The diagnostic trouble code (DTC) can be diagnosed after approx. 10 minutes with the engine running.

Substitute Value

  1. The engine coolant temperature (ECT) is calculated based on a model.

Possible Source

  1. Damaged engine coolant temperature (ECT) sensor.
  2. Contact resistance or oxidation in the terminals.

Fault symptom[s]

  1. Malfunction indicator light (MIL), on
  2. Engine is difficult to start

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-275D

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-2800

Condition

The engine control module (ECM) checks the signal from the fuel pressure sensor.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the signal from the fuel pressure sensor is within the normal signal range of the sensor but that the signal is below a calculated desired value for the fuel pressure.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value

  1. None.

Possible Source

  1. Short-circuit to ground in the signal cable
  2. Damaged fuel pressure sensor.

Fault symptom[s]

  1. Driving/Poor performance/lacks power
  2. Driving/Engine stalls/Unsure when/at all times

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-2800

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-2800

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-280B

Condition

The engine control module (ECM) checks the signal from the fuel pressure sensor.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that there is no signal from the fuel temperature sensor.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value

  1. None.

Possible Source

  1. Open circuit on signal cable.
  2. Damaged fuel pressure sensor.

Fault symptom[s]

  1. Driving/Poor performance/lacks power
  2. Driving/Engine stalls/Unsure when/at all times

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-280B

See .0DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-280B

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-280C

Condition

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the signal from the fuel pressure sensor is too high.

The diagnostic trouble code (DTC) can be diagnosed at ignition on and with the engine running.

Substitute Value

None.

Possible Source

  1. Contact resistance or oxidation in the terminals
  2. Short-circuit to supply voltage in the signal cable
  3. Open-circuit in the signal cable
  4. Open-circuit in the signal ground cable
  5. Damaged temperature sensor.

Fault symptom[s]

  1. Driving/Poor performance/lacks power
  2. Driving/Engine stalls/Unsure when/at all times

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-280C

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-280C

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-280D

Condition

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the signal from the fuel pressure sensor is too low.

The diagnostic trouble code (DTC) can be diagnosed at ignition on and with the engine running.

Substitute Value

None.

Possible Source

  1. Short-circuit to ground in the signal cable
  2. Damaged temperature sensor.

Fault symptom[s]

  1. Driving/Poor performance/lacks power
  2. Driving/Engine stalls/Unsure when/at all times

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-280D

See DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-280D

DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-281C

Condition

Scheme 60

Scheme 60: DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-281C
Scheme 60: DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION ECM-281C

Note. If the diagnostic trouble code is generated, it is an indication that the fuel pressure has exceeded 800 kPa, there is a risk of fuel leakage.

The engine control module (ECM) controls the fuel pressure via the fuel pump (FP) control module using a pulse width modulation (PWM) signal. The fuel pump (FP) control module then controls the fuel pump (FP) depending on the pressure requested by the engine control module (ECM). The diagnostic trouble code (DTC) is stored if the actual pressure (measured pressure from the fuel pressure sensor) rises too high in comparison with the requested pressure (target pressure) during a certain time frame.

The diagnostic trouble code (DTC) can be diagnosed when the engine is idling.

Substitute Value

  1. Predefined value used.

Possible Source

  1. Damaged fuel pump control module.
  2. Damaged fuel pump unit.
  3. The cable for voltage supply to the fuel pump is short-circuited to supply voltage.
  4. Damaged fuel pressure sensor

Fault symptom[s]

  1. Message in information display
  2. Malfunction indicator lamp (MIL) lit
  3. Deterioration in performance
  4. The engine stops.

Scheme 61

Scheme 61: CHECKING THE FUEL INJECTION SYSTEM
Scheme 61: CHECKING THE FUEL INJECTION SYSTEM

Note. If the diagnostic trouble code is generated, it is an indication that the fuel pressure has exceeded 800 kPa, there is a risk of fuel leakage. Therefore, it may be good to perform a check of the fuel system.

  1. Start the engine. Allow the engine to idle.

Check the fuel system for leaks.

Remedy as necessary.

  1. Continue Refer to «CHECKING THE FUEL PRESSURE SENSOR»(ref-466655-S09314735742012042500000)

More articles — Engine Control Module (ECM) Diagnostic Trouble Codes - 3 of 9