BMWAG
Electrical troubleshooting manual
5 Series - E34 (518i, 520i, 525td, 525tds, incl. touring) Schematics Model year 1994

Engine management MS40 (6-cylinder M50)
Scheme 1210.10

Pin Assignment X6000
PinTypeDescription/FunctionConnection
1AIgnition, terminal 1Ignition coil for cyl. 1
2AIgnition, terminal 1Ignition coil for cyl. 3
3AIgnition, terminal 1Ignition coil for cyl. 5
4MGroundGround connection
5AInjection valve, cylinder 6Injection valve
6AInjection valve, cylinder 4Injection valve
7
8EDrive range P/NGear selector lever switch
9ASignal, air condition ONPressure switch
10A AIHKR/F3: Auxiliary fan signal IHKA: Auxiliary fan signalA/C control unit A/C system relay
11not used
12AVehicle speed signalInstrument cluster
13not used
14AThrottle-valve positionEGS control unit
15EImmobilizing deviceOn-board computer
16not used
17ATl signal,Instrument cluster
18ATD speed signalInstrument cluster
19not used
20EIgnition timing interventionEGS control unit
21not used
22AInjection valve, cylinder 3Injection valve
23AInjection valve, cylinder 1Injection valve
24EA/C compressor ONA/C compressor relay
25ESignal, camshaft controlCamshaft control
26EContinuous pos. voltage, terminal 30B+ terminal point
27AIdle actuator signalIdle actuator
28MGroundGround connection
29AIgnition, terminal 1Ignition coil forcyl. 2
30AIgnition, terminal 1Ignition coil forcyl. 4
31AIgnition, terminal 1Ignition coil for cyl. 6
32MGroundGround connection
33AInjection valve, cylinder 5Injection valve
34MGroundGround connection
35MShieldings, crankshaft sensorShielding
36not used
37not used
38MShieldings, camshaft sensorShielding
39MShieldings, knock sensorKnock sensor 1
40MShieldings, knock sensorKnock sensor 2
41not used
42MShieldings, oxygen sensorShielding
43not used
44not used
45not used
46not used
47not used
48E>10V from DME main relayMain relay
49EIgnition, terminal 15Ignition lock
50AInjection valve, cylinder 2Injection valve
51ATank ventilation valveTank ventilation valve
52AEKP relay and TR signal (crank angle reference)Electrical fuel pump relay and electrical transmission
53MGround oxygen sensor heaterOxygen sensor
54E>10V from DME main relayMain relay
55ADME main relayDME main relay
56not used
57not used
58not used
59not used
60EProgramming voltageDiagnostic connector
61not used
62MGroundGround connection
63ESignal -Knock sensor 2
64ESignal -Knock sensor 1
65ASignal +Knock sensor 1
66ASignal +Knock sensor 2
67not used
68MGround, air mass meterAir mass meter
69ESignal, air mass meterHot wire air mass meter
70not used
71not used
72ASignal +Throttle potentiometer
73ESignal, oxygen sensorOxygen sensor
74MComponent groundCamshaft sensor
75MGround, oxygen sensorOxygen sensor
76ESignalThrottle potentiometer
77EThrottle-valve positionThrottle potentiometer
78ESignal -Crankshaft sensor
79ASignal +Crankshaft sensor
80ESignal -Coolant temperature sensor
81ASignal +Coolant temperature sensor
82MComponent groundCrankshaft sensor
83ESignal -Camshaft sensor
84ASignal +Camshaft sensor
85EIntake air temperature sensorIntake air temperature sensor
86MComponent groundIntake air temperature sensor
87ERxD diagnostic data linkDiagnostic connector
88E/ATxD diagnostic data linkDiagnostic connector
E = Input, A = Output, M = Ground