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Home >> Mercedes Benz Truck >> 2012 >> ML 350 BLUETEC (166.024) V6-3.0L DSL Turbo (642.826) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> 169A00

169A00


The supply voltage to the sensors is outside the valid range.


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 B6/1 (Camshaft Hall sensor).

Test 1.3: Check component B70 (Crankshaft Hall sensor).

Test 1.4: Check component Y27/9 (Left EGR positioner).

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 B6/1 (Camshaft Hall sensor).

Test 1.2.1: Check power supply of component B6/1 (Camshaft Hall sensor).

Test 1.2.2: Signal Check component B6/1 (Camshaft Hall sensor).

1.2.1. Check power supply of component B6/1 (Camshaft Hall sensor).
Figure legend

- B6/1 (Camshaft Hall sensor)
- Plug connection B6/1x1
Commercially available tools

- Measuring systemAdapter cablePal 029
Test sequence

- Switch off ignition.
- Detach coupling at component B6/1 (Camshaft Hall sensor).
- Connect adapter cable to engine wiring harness.
- Measure direct voltage with multimeter between sockets (B6/1x1) 1 and (B6/1x1) 3
- Switch on ignition.
Specified value

- Voltage[4.75...5.25] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- SignalCheck component B6/1 (Camshaft Hall sensor).
End of test

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

- Check lines from control module N3/9 (CDI control unit) to component B6/1 (Camshaft Hall sensor) against wiring diagram.
End of test

1.2.2. Signal Check component B6/1 (Camshaft Hall sensor).
Figure legend

- B6/1 (Camshaft Hall sensor)
Commercially available tools

- Measuring systemAdapter cablePal 029
Test sequence

- Switch off ignition.
- Connect adapter cable to component B6/1 (Camshaft Hall sensor).
- Connect STAR DIAGNOSIS with special tool.
- Observe oscilloscope pattern between A4 Blue Socket and A7 Green Socket
- Operate starter for the duration of at least 10 s.
Specified value

- Compare the oscillogram with the characteristics specified for component B6/1 (Camshaft Hall sensor).
Communication with ECU required







1.3. Check component B70 (Crankshaft Hall sensor).

Test 1.3.1: Test signal voltage of component B70 (Hall-Geber Kurbelwelle).

Test 1.3.2: Check power supply of component B70 (Hall-Geber Kurbelwelle).

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

Test 1.3.1.1: The engine does not start.

Test 1.3.1.2: Engine running

1.3.1.1. 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.05) 05(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







1.3.1.2. 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.05) 05(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







1.3.2. 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[4.75...5.25] 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 overevving 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

1.4. Check component Y27/9 (Left EGR positioner).
Check power supply of component Y27/9 (Left EGR positioner).
Figure legend

- Y27/9 (Left EGR positioner)
Special tool

- Adapter cable272 589 02 63 00
Test prerequisite

- The actuation was not okay.
Test sequence

- Switch off ignition.
- Detach coupling at component Y27/9 (Left EGR positioner).
- Connect adapter cable no. 272 589 02 63 00 to engine wiring harness Y27/9 (Left EGR positioner).
- Measure direct voltage with multimeter between sockets (Y27/9x1) 4 and (Y27/9x1) 3
- Switch on ignition.
Specified value

- Voltage[4.75...5.25V]
Question

- Is the measurement value OK?







YES
Test signal cable to component N3/9 (CDI control unit).
Figure legend

- Y27/9 (Left EGR positioner)
Special tools

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

- Switch off ignition.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.18) 18 of the 126-pole socket box tester and (Y27/9x1) 5
Specified value

- Resistor< 1ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Further procedure

- If faults with high fault frequency counters or customer complaints are stored, inspect cables and plug connections between control module N3/9 (CDI control unit) and component Y27/9 (Left EGR positioner) for loose contact and corrosion.
End of test

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

- Inspect cables, electrical connections and plug connections for damage, correct connection, loose contact and corrosion, and repair or replace if necessary.
End of test

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

- Test wiring of voltage supply between component Y27/9 (Left EGR positioner) and component N3/9 (CDI control unit).
- Check electrical lines for proper installation (largest possible radii), and for kinks, chafing and pinching.
End of test

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