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Home >> Mercedes Benz Truck >> 2009 >> ML 320 BLUETEC (164.125) V6-3.0L DSL Turbo (642.820) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> 102000

Manufacturer Code Charts: 102000


The reference voltage of component B37 (Accelerator pedal sensor) is implausible.


Possible cause:

- Supply voltage
Affected functions:

- Power generation

-------------------------------------------------

Test 1: Test voltage supply.

1. Test voltage supply.

Test 1.1: If fault codes for several sensors are displayed at the same time, then one sensor has a short circuit to GND or to POS at the component or at the lead.

Test 1.2: Check component B37 (Accelerator pedal sensor). Sensor 1

Test 1.3: Check component B37 (Accelerator pedal sensor). Sensor 2

Test 1.4: Check component B70 (Crankshaft Hall sensor).

Test 1.5: Check component B5/1 (Charge pressure sensor).

1.1. If fault codes for several sensors are displayed at the same time, then one sensor has a short circuit to GND or to POS at the component or at the lead.

1.1. No further information available.

1.2. Check component B37 (Accelerator pedal sensor). Sensor 1
Check actual value B37 (Accelerator pedal sensor). Sensor 1
Test prerequisite

- Switch on ignition.
Status of relevant actual value:
- B37 (Accelerator pedal sensor) Sensor 1:Warning! Communication with ECU required.
Specified value

- Accelerator pedal not depressed = 4.0 - 8.5 %
- Accelerator pedal depressed fully = 88.8 - 95.4 %(Kickdown)
Question

- Is the actual value o.k.?


YES
The actual value is okay.Possible cause and remedy

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
Check power supply of component B37 (Accelerator pedal sensor). Sensor 1
Figure legend

- B37 (Accelerator pedal sensor)
Test prerequisite

- The actual value is not o.k.
Test sequence

- Switch off ignition.
- Detach coupling at component B37 (Accelerator pedal sensor).
- Measure direct voltage with multimeter between sockets (B37x1) 3 and (B37x1) 1
- Switch on ignition.
Specified value

- Voltage[4.6...5.1] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- Test lead to pin 2 for short circuit and open circuit.
- Component B37 (Accelerator pedal sensor) is defective.
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Test signal line between components N3/9 (CDI control unit) and B37 (Accelerator pedal sensor) for Short circuit to ground.
- 5 V Voltage supply interrupted
End of test

1.3. Check component B37 (Accelerator pedal sensor). Sensor 2
Check actual value B37 (Accelerator pedal sensor). Sensor 2
Test prerequisite

- Switch on ignition.
Status of relevant actual value:
- B37 (Accelerator pedal sensor) Sensor 2:Warning! Communication with ECU required.
Specified value

- Accelerator pedal not depressed = 1.7 - 4.3 %
- Accelerator pedal depressed fully = 44.4 - 48.2 %(Kickdown)
Question

- Is the actual value o.k.?


YES
The actual value is okay.Possible cause and remedy

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
Check power supply of component B37 (Accelerator pedal sensor). Sensor 2
Figure legend

- B37 (Accelerator pedal sensor)
Test prerequisite

- The actual value is not o.k.
Test sequence

- Switch off ignition.
- Detach coupling at component B37 (Accelerator pedal sensor).
- Measure direct voltage with multimeter between sockets (B37x1) 4 and (B37x1) 1
- Switch on ignition.
Specified value

- Voltage[4.6...5.1] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- Test lead to pin 6 for short circuit and open circuit.
- Component B37 (Accelerator pedal sensor) is defective.
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Check line from N3/9 (CDI control unit) to B37 (Accelerator pedal sensor) for Open circuit.
- Check line from N3/9 (CDI control unit) to B37 (Accelerator pedal sensor) for Short circuit.
- Test ground cable of component B37 (Accelerator pedal sensor) for Open circuit.
End of test

1.4. Check component B70 (Crankshaft Hall sensor).

Test 1.4.1: Test signal voltage of component B70 (Hall-Geber Kurbelwelle).

Test 1.4.2: Check power supply of component B70 (Hall-Geber Kurbelwelle).

1.4.1. Test signal voltage of component B70 (Hall-Geber Kurbelwelle).

Test 1.4.1.1: The engine does not start.

Test 1.4.1.2: Engine running

1.4.1.1. The engine does not start.
Settings

- Trigger level: 50 %
- Time range: 5 ms
Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/9 (CDI control unit).
- Observe oscilloscope pattern between sockets (M.07) 07(A7) and (M.39) 39(A4) of the 126-pole socket box tester.
- Start engine.
Specified value

- Measuring system
Warning!The rising signal edge in the gap (see arrow) may vary.Note

- Measuring system:Communication with ECU required







1.4.1.2. Engine running
Settings

- Trigger level: 50 %
- Time range: 5 ms
Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/9 (CDI control unit).
- Observe oscilloscope pattern between sockets (M.07) 07(A7) and (M.39) 39(A4) of the 126-pole socket box tester.
- Operate engine at idling speed.
Specified value

- Measuring system
Warning!The rising signal edge in the gap (see arrow) may vary.Note

- Measuring system:Communication with ECU required







1.4.2. Check power supply of component B70 (Hall-Geber Kurbelwelle).
Figure legend

- B70 (Crankshaft Hall sensor)
Test sequence

- Switch off ignition.
- Unplug 3-pin connector from component B70 (Crankshaft Hall sensor).
- Measure direct voltage with multimeter between sockets (B70x1) 1 and (B70x1) 3
- Switch on ignition.
Specified value

- Voltage[4.8...5.3] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- Test signal cable to component B70 (Crankshaft Hall sensor).
- The teeth on the increment wheel may be bent.
- Engine over-revving has occurred.
- B70 (Crankshaft Hall sensor)
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Lines to component B70 (Crankshaft Hall sensor)
End of test

1.5. Check component B5/1 (Charge pressure sensor).
Check actual value B5/1 (Charge pressure sensor).
Test prerequisite

- Ignition ON
Status of the relevant actual values:
- B2/6b1 (Left intake air temperature sensor):Warning! Communication with ECU required.

- Boost pressure:Warning! Communication with ECU required.

- Intake air pressure:Warning! Communication with ECU required.
NOTE

- When the coupling on component B5/1 (Charge pressure sensor) is unplugged, a substitute value of approx. 800 hPa is displayed.
- Actual value 'Boost pressure' only changes once the ignition has been switched on again.
Specified value at a temperature < 10 C°

- With the ignition on, the values for intake air pressure and boost pressure may not deviate from one another by more than +/- 101 hPa.
Specified values at 10 - 85 °C

- With the ignition on, the values for intake air pressure and boost pressure may not deviate from one another by more than +/- 60 hPa.
Specified value at a temperature > 85 C°

- With the ignition on, the values for intake air pressure and boost pressure may not deviate from one another by more than +/- 101 hPa.
Question

- Are the actual values o.k.?


YES
The actual value is okay.Further procedure

- Test wiring and plug connections between control module N3/9 (CDI control unit) and B5/1 (Charge pressure sensor) for Loose contact, repair or replace if necessary.
End of test

NO
Voltage supply of component B5/1 (Charge pressure sensor)
Figure legend

- B5/1 (Charge pressure sensor)
- M16/6 (Throttle valve actuator)
- The muffler was removed from the picture to improve the view.
Test prerequisite

- The actual value is not o.k.
- Muffler is installed.
Test prerequisite

- Switch off ignition.
- Detach coupling at component B5/1 (Charge pressure sensor).
- Measure direct voltage with multimeter between sockets (B5/1x1) 1 and (B5/1x1) 3
- Switch on ignition.
Specified value

- Voltage[4.8...5.1] V
Question

- Is the measurement value OK?







YES
Signal cable of component B5/1 (Charge pressure sensor)
Figure legend

- B5/1 (Charge pressure sensor)
- M16/6 (Throttle valve actuator)
Special tools

- Test cable 266 589 01 63 00
- Socket box 129 589 00 21 00
Test sequence

- Switch off ignition.
- Unplug connector of control module and component.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.85) 85 of the 126-pole socket box tester and socket (B5/1x1) 2
Specified value

- Resistor< 1ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- Replace component B5/1 (Charge pressure sensor).
End of test

NO
The signal line from component B5/1 (Charge pressure sensor) has Open circuit.
The measurement value is not OK.Possible cause and remedy

- The signal line from component B5/1 (Charge pressure sensor) has Open circuit.
- Check affected lines and repair if necessary.
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Test lines between components N3/9 (CDI control unit) and B5/1 (Charge pressure sensor) for Short circuit or open circuit.
End of test

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