Relay for air pump : Short circuit to ground (P2257)

P2257
Relay for air pump : Short circuit to ground (P2257)
Possible cause:
­ M33 (electric air pump)
Affected functions:
­
Engine diagnosis
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
Test 1: Check component M33 (electric air pump).
1. Check component M33 (electric air pump).
Test 1.1: Check component M33 (electric air pump) by means of actuation.
Test 1.2: Check power supply of component M33 (electric air pump).
Test 1.3: Check component K40/4kO (Air pump or reserve relay).
1.1. Check component M33 (electric air pump) by means of actuation.
Test prerequisite
­
­
Engine at idle
Actuate component M33 (electric air pump).(Move on to actuation with button F2)
Warning!Communication with ECU required.
1.2. Check power supply of component M33 (electric air pump).
Test prerequisite
­ Actuation is not OK.
Test sequence
­ Switch off ignition.
­ (M33) Measure direct voltage with multimeter between 2 and 1 (M33)
­ Switch on ignition.
­ Actuate with key F2.
Specified value
­
Voltage[11.0...15.0] V
10.52SS
Page 2512010 Mercedes Benz E 63 AMG Sedan (212.077) V8­6.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Warning!Communication with ECU required.
1.3. Check component K40/4kO (Air pump or reserve relay).
Test 1.3.1: Test current consumption of component K40/4kO (Air pump or reserve relay).
1.3.1. Test current consumption of component K40/4kO (Air pump or reserve relay).
Figure legend
­ A ­ConnectionTest cable 35­pin socket box
­ 001 ­Sockets of component N3/10 (ME­SFI [ME] control unit)
­ 05 ­35­pin socket box
­ 050 ­126­pin socket box
­ 108 ­Test cable 266 589 01 63 00
­ N3/10 (ME­SFI [ME] control unit)
­ II 1­63ConnectionTest cable
­ III 64­126ConnectionTest cable
Warning!
­ Connection A of test cable 108 may NOT be connected to connection B of the 126­pin socket box (050).
Continue to test with button F2
Page 2522010 Mercedes Benz E 63 AMG Sedan (212.077) V8­6.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Page 253
Test sequence
­ Measure direct current with multimeter between sockets [F.4] 100 and [F.19] 115 of the 126­pole socket box tester.
Warning!Perform the measurement only for a short time so that component M33 (electric air pump) does not overheat.Specified value
­ Amperage[0.1...0.3] A
­ Component M33 (electric air pump) is switched on and is heard to run.
Question
­
Is the measurement value OK?
YES
The test was okay.End of test
NO
The measurement value is not OK.Possible cause and remedy
­ K40/4f32 (Fuse 32)
­ Lines to component K40/4kO (Air pump or reserve relay)
­ K40/4kO (Air pump or reserve relay)
End of test