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Pin Voltage Charts

DME/MOTRONIC CONTROL UNIT PIN ASSIGNMENTS (1.8L M42 ENGINE) (1)

Pin No. Function/Description Signal Type Or Voltage Value
1 Fuel Pump Relay & Crankshaft/Speed Sensor (2)(3) Superimposed Ground And Speed Signal Output
3 Fuel Injectors (No. 1 & 3) Square Wave Output Signal
6 Fuel Injectors (Ground) Ground Circuit
8 CHECK ENGINE Light (4) Ground Circuit (Output Signal)
11 Throttle Potentiometer (TPS) Electronic Transmission Control (EGS) Output Signal
12 Throttle Potentiometer (TPS) (5) 5 Volts (Input Signal)
14 Airflow Sensor Ground Circuit
16 Camshaft Sensor Square Wave Input Signal
17 Instrument Cluster (Tach Signal) Square Wave Output Signal
18 A/C Compressor Shutoff (6) Ground Circuit (Output Signal)
24 Ignition (Cylinder No. 3) Primary Circuit Output Signal
25 Ignition (Cylinder No. 1) Primary Circuit Output Signal
26 Battery Voltage (Permanent) 12 Volts (Battery Voltage Input)
27 DME Master Relay Ground Circuit
28 Sensors (Shield Wire) Ground Circuit
29 Idle Speed Control Square Wave Output Signal
32 Fuel Injectors (No. 2 & 4) Square Wave Output Signal
34 Ground (Except Injectors & Ignition) Ground Circuit
36 Fuel Tank Vent (Evaporation) Control Ground Circuit (If Open)
37 Oxygen Sensor Heater Relay Ground Circuit (If Heating Element Is On)
41 Airflow Sensor Zero Volt (Input Signal)
43 Throttle Potentiometer (TPS) Ground Circuit
44 Camshaft Sensor Ground Circuit
48 Kickdown Prevent Ground Circuit (If Not Active)
51 Ignition (Cylinder No. 4) Primary Circuit Output Signal
52 Ignition (Cylinder No. 2) Primary Circuit Output Signal
54 Battery Voltage 12 Volts (Battery Voltage Input)
55 Ignition (Ground) Ground Circuit
56 Start (Ignition) Input 12 Volts (Battery Voltage Input)
59 Airflow Sensor 5-Volt (Reference) Output Signal
60 Programming Voltage (7) Ground Ckt. (Input Signal)
61 Programming Voltage (7) Ground Ckt. (Input Signal)
63 Torque Converter Lock-Up (8) Ground Ckt. (Input Signal)
64 Transmission Tap (9) Ground Ckt. (Input Signal)
65 Park/Neutral Switch (10) Ground Ckt. (Input Signal)
67 Pulse Sensor (Inductive) Square Wave Input Signal
68 Pulse Sensor (Inductive) Ground Circuit
70 Oxygen Sensor 0.2-0.8 Volt (Input Signal)
71 Oxygen Sensor (Ground) Ground Circuit
73 Speedometer Signal Square Wave Input Signal
74 Engine Speed (TD) Signal Square Wave Output Signal
76 Idle Speed (CO) 1-4 Volts (Input Signal)
77 Intake Air Temp. Sensor Zero Volt (Input Signal)
78 Engine (Coolant) Temp. Sensor Zero Volt (Input Signal)
81 Anti-Theft Alarm Switch (11) 12 Volts (Battery Voltage Input)
85 A/C Compressor (12) 12 Volts (Battery Voltage Input)
86 A/C Switch (13) 12 Volts (Battery Voltage Input)
87 Diagnostic Initiation Line (RxD) (7) 12 Volts (Battery Voltage Input)
88 Diagnostic Data Line (TxD) (7) Ground Circuit (Input/ Output Signal)
(1) Pin assignments not listed are not used (blank).
(2) Ground output signal from control unit.
(3) Superimposed with fuel pump ground circuit. Speed signal is generated once each revolution.
(4) If exhaust relevant fault stored in memory.
(5) Five-volt signal input to control unit will vary depending on throttle position.
(6) At 5 MPH and engine at full load.
(7) With diagnostic socket cover closed.
(8) If converter clutch is closed.
(9) If transmission tap is active.
(10) In Park or Neutral position.
(11) With anti-theft alarm activated (armed).
(12) With A/C compressor clutch engaged.
(13) With A/C system on.
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