P20E1

Charge air coolant circuit : Charge air temperature is too high.

Test 1: Bleed low temperature coolant circuit of charge air cooler.

Test 2: Check component B17/8 (Charge air temperature sensor).

Test 3: Check component M44 (charge air cooler circulation pump).

1. Bleed low temperature coolant circuit of charge air cooler.
Note

- WIS is not available on this system.
- It is not possible to display the requested WIS document ar2000p1145h.
- You can start WIS on another system and display the WIS document by entering the document number ar2000p1145h in the 'Contents' field.
Information

- The low temperature coolant circuit cap may only be opened when the low temperature circuit is cold (ambient temperature).To cool the low temperature circuit quickly, detach component K40/8k0 and link circuits 30 and 87.At the same time, actuate the electric suction fan via DAS.







2. Check component B17/8 (Charge air temperature sensor).

Test 2.1: Check component B17/8 (Charge air temperature sensor) using actual value.

Test 2.2: Check internal resistance of component B17/8 (Charge air temperature sensor).

2.1. Check component B17/8 (Charge air temperature sensor) using actual value.
Test sequence

- Switch on ignition.
Status of relevant actual value:
- B17/8 (Charge air temperature sensor):Warning! Communication with ECU required.
Specified value

- If the connection is unplugged at component B17/8 (Charge air temperature sensor), the value is approx. -40° C.
- Bridge pin 1 in pin 2 at the unplugged connection of component B17/8 (Charge air 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

- Air in low-temperature circuit


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

- Check lines from component B17/8 (Charge air temperature sensor) to component N3/10 (ME-SFI [ME] control unit).
End of test

2.2. Check internal resistance of component B17/8 (Charge air temperature sensor).
Test prerequisite

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

- Switch off ignition.
- Measure resistance with multimeter between pins (B17/8) 1 and (B17/8) 2
Specified values

- Resistor(20° C): [5763...6370]ohms
- Resistor(30° C): [3792...4191]ohms
- Resistor(40° C): [2473...2733]ohms
- Resistor(50° C): [1679...1856]ohms
- Resistor(60° C): [1165...1288]ohms
- Resistor(70° C): [822...909]ohms
- Resistor(80° C): [591...654]ohms
- Resistor(100° C): [321...355]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

- B17/8 (Charge air temperature sensor)
End of test

3. Check component M44 (charge air cooler circulation pump).

Test 3.1: Check component M44 (charge air cooler circulation pump) by means of actuation.

Test 3.2: Test current consumption of component M44 (charge air cooler circulation pump).

Test 3.3: Test current consumption of component N10/9kO (Charge air cooler recirculation pump relay).

3.1. Check component M44 (charge air cooler circulation pump) by means of actuation.
Test sequence

- Ignition ON
- Actuate component M44 (charge air cooler circulation pump).
Actuate with key F2.







Warning!Communication with ECU required.

3.2. Test current consumption of component M44 (charge air cooler circulation pump).
Figure legend

- 003 Multimeter
- N10/9 (SAM control module with fuse and relay module, front passenger)
Test prerequisite

- Component M44 (charge air cooler circulation pump) does not run.
Test sequence

- Switch off ignition.
- Unplug component N10/9kO (Charge air cooler recirculation pump relay) from component N10/9 (SAM control module with fuse and relay module, front passenger).
- Connect multimeter as specified in connection diagram (right-hand figure).
- Measure direct current with multimeter between sockets [N10/9kO] 3 and [N10/9kO] 5
- Switch on ignition.
Component M44 (charge air cooler circulation pump) runs.Specified value

- Amperage [3.0...5] A
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- N10/9kO (Charge air cooler recirculation pump relay)
End of test







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

- Check fuse N10/9f53 (Fuse 53).
- Line from component N10/9kO (Charge air cooler recirculation pump relay) to component M44 (charge air cooler circulation pump)
- If the actual value is lower then the specified value, there may be air in the low temperature circuit.
- M44 (charge air cooler circulation pump)
Check low-temperature circuit.Continue with F2







Note

- WIS is not available on this system.
- It is not possible to display the requested WIS document ar2000p1145h.
- You can start WIS on another system and display the WIS document by entering the document number ar2000p1145h in the 'Contents' field.
Information

- The low temperature coolant circuit cap may only be opened when the low temperature circuit is cold (ambient temperature).To cool the low temperature circuit quickly, detach component K40/8k0 and link circuits 30 and 87.At the same time, actuate the electric suction fan via DAS.







3.3. Test current consumption of component N10/9kO (Charge air cooler recirculation pump relay).
Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct current with multimeter between sockets [3.4] 37 and [4.22] 107 of the 126-pole socket box tester.
- Switch on ignition.
Specified value

- [10...25] mA(Output stageSAM)
Question

- Is the measurement value OK?


YES
The measurement value is OK.End of test

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

- Cable to component N10/9kO (Charge air cooler recirculation pump relay)
- N10/9kO (Charge air cooler recirculation pump relay)
End of test