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Home >> Mercedes Benz >> 2008 >> SL 600 (230.477) V12-5.5L Turbo (275.954) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> 2019

Manufacturer Code Charts: 2019


Power output limited because temperature of coolant or transmission oil too high


Possible cause:

- Engine cooling
Affected functions:

- Engine output

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Test 1: Test engine cooling system.

1. Test engine cooling system.
Test prerequisite

- Fault code '2019' present
Causes for constant overheating of engine may be

- Coolant level is not o.k.
- There is air present in the coolant circuit.
- The coolant circulation is insufficient.
- Radiator
- Coolant thermostat
- M4/7 (Engine and AC electric suction fan with integrated control)
Guided tests ( Operate pushbutton F2. )

Test PWM signal for operating the suction fan.

Question

- Is the component 'M4/7 (Engine and AC electric suction fan with integrated control)' in limp-home mode?


YES

Test 1.1: Test PWM signal for operating the suction fan.

Test 1.2: Check component B11/4 (Coolant temperature sensor).

1.1. Test PWM signal for operating the suction fan.
Check power supply of component M4/7 (Engine and AC electric suction fan with integrated control).
Test prerequisite

- The ignition must be switched on.
Test sequence

- Check power supply at connector of component M4/7 (Engine and AC electric suction fan with integrated control) (pin 2) against ground.
Specified value

- Voltage[11.0...15.0] V
Continue with button F2

Figure legend

- AConnectionTest cable 35-pin socket box
- 001Sockets of component N3/10 (ME-SFI [ME] control unit)
- 0535-pin socket box
- 050126-pin socket box
- 108Test cableN3/10 (ME-SFI [ME] control unit)
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- II 64-126ConnectionTest cable
Test sequence

- Switch off ignition.
- Connect socket box (35-pin) to component N3/10 (ME-SFI [ME] control unit).
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Switch on ignition.
Warning!

- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
Continue to test with button F2







Test prerequisite

- Coolant temperature< 80° C
- Charger connected(The battery voltage must be higher than 12.5 V.)
- Ignition ON
- Engine not running
- Vehicle stationary
- There is no fault code present for component B11/4 (Coolant temperature sensor).
- The fuses of component M4/7 (Engine and AC electric suction fan with integrated control) are OK.
Actual values:
- Temperature of coolant:Warning! Communication with ECU required.
Continue with button F2

1.2. Check component B11/4 (Coolant temperature sensor).

Test 1.2.1: Check component B11/4 (Coolant temperature sensor) using actual value.

Test 1.2.2: Check internal resistance of component B11/4 (Coolant temperature sensor).

Test 1.2.3: Test signal voltage of component B11/4 (Coolant temperature sensor).

1.2.1. Check component B11/4 (Coolant temperature sensor) using actual value.
Test sequence

- Switch on ignition.
Status of relevant actual value:
- Temperature of coolant:Warning! Communication with ECU required.
Specified value

- If the connection is unplugged at component B11/4 (Coolant temperature sensor), the value is approx. -40° C.
- Bridge pin 1 in pin 2 at the unplugged connection of component B11/4 (Coolant temperature sensor).The value is approx. 170° C.
Question

- Is the actual value o.k.?


YES
The actual value is okay.Further possible causes of fault

- Check internal resistance of component B11/4 (Coolant temperature sensor).


NO
The actual value is not o.k.Possible cause and remedy

- Check lines from component B11/4 (Coolant temperature sensor) to component N3/10 (ME-SFI [ME] control unit).
End of test

1.2.2. Check internal resistance of component B11/4 (Coolant temperature sensor).
Test prerequisite

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

- Switch off ignition.
- Measure resistance with multimeter between pins (B11/4) 1 and (B11/4) 2
Specified values

- Resistor(20° C): [2937...3237]ohms
- Resistor(30° C]: [1898...2098]ohms
- Resistor(40° C): [1197...1457]ohms
- Resistor(50° C): [855...945]ohms
- Resistor(60° C): [590...650]ohms
- Resistor(70° C): [420...460]ohms
- Resistor(80° C): [305...335]ohms
- Resistor(90° C): [220...240]ohms
- Resistor(100° C): [160...180]ohms
Question

- Are the measurement values OK?


YES
The measurement values are OK.End of test

NO
The measurement values are not OK.Possible cause and remedy

- B11/4 (Coolant temperature sensor)
End of test

1.2.3. Test signal voltage of component B11/4 (Coolant temperature sensor).
Test prerequisite

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

- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct voltage with multimeter between sockets (3.4) 37 and (3.22) 55 of the 126-pole socket box tester.
- Switch on ignition.
Status of relevant actual value:
- Temperature of coolant:Warning! Communication with ECU required.
Specified values

- Voltage(20° C): [3.35...3.42] V
- Voltage(30° C]: [2.85...2.90] V
- Voltage(40° C): [2.34...2.39] V
- Voltage(50° C): [1.88...1.92] V
- Voltage(60° C): [1.47...1.50] V
- Voltage(70° C): [1.14...1.17] V
- Voltage(80° C): [0.88...0.90] V
- Voltage(90° C): [0.68...0.70] V
- Voltage(100° C): [0.52...0.54] V
Question

- Are the measurement values OK?


YES
The measurement values are OK.End of test

NO
The measurement values are not OK.Possible cause and remedy

- Line from control unit N3/10 (ME-SFI [ME] control unit) to component B11/4 (Coolant temperature sensor)
- B11/4 (Coolant temperature sensor)
End of test

NO
Warning!Communication with ECU required.

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