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Engine Controls - Pin Voltage Charts (Includes E36 Convertible): Introduction

NOTE: Following information applies to E36 and E46 models only.

Pin voltage (value) charts are used for diagnosing intermittent symptoms and faults that are unable to be resolved during self-diagnostics. Pin voltage tests ensure Powertrain Control Module (PCM) is receiving and transmitting proper voltage and other signals. Before performing pin voltage tests, ensure engine mechanical condition has been thoroughly inspected and self-diagnostics has been attempted. Technical Service Bulletins (TSBs) may also be helpful in correcting a hard to diagnose problem. E36 models use an 88-pin PCM connector. See Fig 1. E46 models use a 9-pin, 24-pin, 40-pin and 52-pin connector. See Fig 2-Fig 5 .

Fig 1: Identifying PCM 88-Pin Connector (E36)
G98J11311Courtesy of BMW OF NORTH AMERICA, INC.
PCM 88-PIN CONNECTOR TERMINAL IDENTIFICATION (E36 4-Cylinder)

Terminal Signal Type
No. 1 HO2S Ground
No. 2 Idle Speed Control Valve Output
No. 3 Cylinder No. 1 Fuel Injection Valve Output
No. 4 Cylinder No. 4 Fuel Injection Valve Output
No. 5 Not Used
No. 6 Fuel Injection Valve Output Ground
No. 7 Not Used
No. 8 CHECK ENGINE Indicator Output
No. 9 Not Used
No. 10 Immobilizer Control Module Input
No. 11 A/C Pressure Switch Input
No. 12-15 Not Used
No. 16 Intake Air Temperature Sensor Input
No. 17 Hot Film Air Mass Meter Ground
No. 18 Not Used
No. 19 Oxygen Sensor Signal Input
No. 20 Crankshaft Position/RPM Sensor Input
No. 21 Camshaft Position Sensor Input
No. 22 Cylinder No. 3 Ignition Coil Output
No. 23 Cylinder No. 4 Ignition Coil Output
No. 24-25 Not Used
No. 26 Battery Voltage
No. 27 Engine Control Module Relay Control Output
No. 28 Ground
No. 29 Idle Speed Control Valve Output
No. 30 Oxygen Sensor Heater Ground
No. 31 No. 3 Fuel Injection Valve Output
No. 32 No. 2 Fuel Injection Valve Output
No. 33 Not Used
No. 34 Ground
No. 35 Not Used
No. 36 A/C Compressor Cut-Out Relay Output
No. 37-39 Not Used
No. 40 Cylinders 3-4 Knock Sensor Input
No. 41 Not Used
No. 42 Fuel Consumption Signal Input
No. 43 Not Used
No. 44 Throttle Position Sensor Input
No. 45 Hot Film Air Mass Meter Signal Input
No. 46 Oxygen Sensor Ground
No. 47-48 Not Used
No. 49 Cylinder No. 1 Ignition Coil Output
No. 50 Cylinder No. 2 Ignition Coil Output
No. 51-52 Not Used
No. 53 Throttle Position Sensor Output
No. 54 Engine Control Module Relay Input
No. 55 Ignition Ground
No. 56 Ignition Switch Input
No. 57 Auxiliary Fan Normal Speed Relay
No. 58 Intake Air Resonance Change Over Valve Output
No. 59 Not Used
No. 60 Data Link Connector Programming Voltage Input
No. 61 Evaporative Emission Valve Output
No. 62 Not Used
No. 63 Fuel Pump Relay Output
No. 64-67 Not Used
No. 68 Temperature Switch Signal Greater Than 176°F (80°C)
No. 69 A/C Signal On Input
No. 70 Cylinders No. 1-2 Knock Sensor Input
No. 71 Temperature/Knock/Throttle Position Sensors Ground
No. 72-73 Not Used
No. 74 Engine Coolant Temperature Sensor Signal Input
No. 75-76 Not Used
No. 77 Oxygen Sensor Output Signal
No. 78 Crankshaft Position/RPM Sensor Input
No. 79 ABS/ASC Control Module Right Rear Speed Signal Input
No. 80 Crankshaft RPM Speed Signal Output
No. 81-82 Not Used
No. 83 Vehicle Speed Signal Input
No. 84 Not Used
No. 85 EGS/ASC Control Module CAN-LOW Input & Output
No. 86 EGS/ASC Control Module CAN-HIGH Input & Output
No. 87 Data Link Connector Diagnosis Data Line Output
No. 88 Data Link Connector Diagnosis Data Line Input & Output
PCM 88-PIN CONNECTOR TERMINAL IDENTIFICATION (E36 6-CYLINDER)

Terminal Signal Type
No. 1 Cylinder No. 2 Ignition Coil Control Output
No. 2 Cylinder No. 4 Ignition Coil Control Output
No. 3 Cylinder No. 6 Ignition Coil Control Output
No. 4 Ground
No. 5 Cylinder No. 2 Fuel Injection Valve Control Output
No. 6 Cylinder No. 1 Fuel Injection Valve Control Output
No. 7 Hot Wire Air Mass Meter Ground
No. 8 Hot Wire Air Mass Meter Input
No. 9 Fuel Consumption Input
No. 10 Engine Coolant Temperature Sensor Input
No. 11 Fuel Tank Pressure Sensor Input
No. 12 Throttle Position Sensor Input
No. 13 Not Used
No. 14 Intake Air Temperature Sensor Input
No. 15 ABS/ASC Control Module Input
No. 16 A/C Pressure Switch Input
No. 17 Not Used
No. 18 Immobilizer Control Module Input
No. 19 A/C On Signal Input
No. 20 CHECK ENGINE Indicator Control Output
No. 21 Variable Camshaft Control Valve Output
No. 22 Cylinder No. 3 Fuel Injection Valve Control Output
No. 23 Cylinder No. 6 Fuel Injection Valve Control Output
No. 24 Cylinder No. 4 Fuel Injection Valve Control Output
No. 25 Oxygen Sensor Heater Ground
No. 26 Battery Voltage
No. 27 Idle Speed Control Valve Output
No. 28 Ground
No. 29 Cylinder No. 1 Ignition Coil Control Output
No. 30 Cylinder No. 3 Ignition Coil Control Output
No. 31 Cylinder No. 5 Ignition Coil Control Output
No. 32 Ground
No. 33 Cylinder No. 5 Fuel Injection Valve Control Output
No. 34 Ground
No. 35 Secondary Air Pump Relay Output
No. 36 Crankshaft RPM Speed Signal Output
No. 37 Not Used
No. 38 Knock Sensor Ground
No. 39 Temperature Sensor Ground
No. 40 Crankshaft Position/RPM Sensor/Fuel Tank Pressure Sensor Ground
No. 41 Camshaft Position Sensor Ground
No. 42 Throttle Position Sensor Ground
No. 43 Camshaft Position Sensor Input
No. 44 Throttle Position Sensor/Fuel Tank Pressure Sensor Output
No. 45 Throttle Position Signal Output
No. 46 Fuel Consumption Input
No. 47-48 Not Used
No. 48 Crankshaft Position/RPM Sensor Output
No. 49 Ignition Switch Input
No. 50 Solenoid Valve Output
No. 51 Carbon Canister Valve Output
No. 52 Exhaust Gas Flap Valve Output
No. 53 Idle Speed Control Valve Output
No. 54 Engine Control Module Relay Input Voltage
No. 55 Oxygen Sensor Heater Ground
No. 56 Ground
No. 57 Cylinders No. 1-3 Knock Sensor Input
No. 58 Cylinders No. 1-3 Knock Sensor Input
No. 59 Cylinders No. 4-6 Knock Sensor Input
No. 60 Data Link Connector Programming Voltage Input
No. 61 Oxygen Sensor
No. 62 Secondary Air Pump Valve Output
No. 63 Cylinders 4-6 Knock Sensor
No. 64 Camshaft Position Sensor Ground
No. 65 Camshaft Position Sensor Input
No. 66 Not Used
No. 67 Oxygen Sensor Signal Ground
No. 68 Evaporative Emission Valve Output
No. 69 Fuel Pump Relay Output
No. 70 Oxygen Sensor Signal Ground
No. 71 Oxygen Sensor Signal Ground
No. 72 Oxygen Sensor Signal Ground
No. 73 Engine Control Module Relay Input
No. 74 Compressor Control Relay Output
No. 75 Oxygen Sensor Signal Input
No. 76 Oxygen Sensor Signal Input
No. 77 Oxygen Sensor Signal Input
No. 78 Oxygen Sensor Signal Input
No. 79 Oxygen Sensor Heater Ground
No. 80 Slip Control Module ABS/ASC Output
No. 81 Slip Control Module ABS/ASC Output
No. 82 Slip Control Module ABS/ASC Output
No. 83 Crankshaft Position/RPM Sensor Input
No. 84 Not Used
No. 85 Transmission Control Module CAN LOW Input/Output
No. 86 Transmission Control Module CAN HIGH Input/Output
No. 87 Engine Control Module Input Voltage
No. 88 Data Link Connector Input/Output
PCM 9-PIN CONNECTOR TERMINAL IDENTIFICATION (E46)

Terminal Signal Type
No. 1 Unloader Relay Terminal No. 15
No. 2-3 Not Used
No. 4-6 Ground
No. 7 12 Volts
No. 8 12 Volts
No. 9 12 Volts
Fig 2: Identifying PCM 9-Pin Connector (E46)
G99I05493Courtesy of BMW OF NORTH AMERICA, INC.
PCM 24-PIN CONNECTOR TERMINAL IDENTIFICATION (E36 6-Cylinder)

Terminal Signal Type
No. 1 HO2S1 Signal Front Of Catalytic Converter
No. 2 Not Used
No. 3 CAN Bus Low Signal (TCM)
No. 4 CAN Bus High Signal (TCM)
No. 5 Not Used
No. 6 Signal Data Link (TCM)
No. 7 HO2S1 Signal Behind Catalytic Converter
No. 8-11 Not Used
No. 12 Changeover Valve Signal
No. 13 HO2S2 Signal Front Of Catalytic Converter
No. 14 HO2S1 Signal Front Of Catalytic Converter
No. 15 HO2S2 Signal Front Of Catalytic Converter
No. 16 HO2S1 Signal Behind Catalytic Converter
No. 17 Not Used
No. 18 HO2S2 Ground Signal Behind Catalytic Converter
No. 19 HO2S2 Ground Signal Behind Catalytic Converter
No. 20 HO2S1 Ground Signal Front Of Catalytic Converter
No. 21 HO2S2 Ground Signal Front Of Catalytic Converter
No. 22 HO2S1 Ground Signal Behind Catalytic Converter
No. 23 Signal Activation Main DME Relay
No. 24 HO2S Ground Signal Behind Catalytic Converter
Fig 3: Identifying PCM 24-Pin Connector (E46)
G99A05494Courtesy of BMW OF NORTH AMERICA, INC.
PCM 52-PIN CONNECTOR TERMINAL IDENTIFICATION (E46)

Terminal Signal Type
No. 1 MAF Sensor Signal
No. 2 Exhaust Camshaft Sensor No. 1
No. 3 Suction Jet Pump Shut-Off Valve
No. 4 Throttle Valve Supply
No. 5 Intake Camshaft Sensor No. 1
No. 6 Not Used
No. 7 Throttle Valve Supply
No. 8 Crankshaft Position Sensor
No. 9 Throttle Valve Sensor
No. 10 Throttle Valve Potentiometer
No. 11 Not Used
No. 12 Starter Signal
No. 13 Generator Signal
No. 14 TPS Ground
No. 15 Exhaust Camshaft Sensor Ground
No. 16 Throttle Valve Signal
No. 17 Airflow Sensor Ground
No. 18 Intake Camshaft Sensor Ground
No. 19 Throttle Potentiometer Signal
No. 20 Throttle Position Sensor Ground
No. 21 Crankshaft Position Sensor Ground
No. 22 Intake Air Temperature Signal
No. 23 Intake Air Temperature Ground
No. 24 Coolant Temperature Sensor Signal
No. 25 Coolant Temperature Signal Ground
No. 26 Oil Pressure Signal
No. 27 Oil Temperature Signal
No. 28 Oil Temperature Sensor Ground
No. 29 Knock Sensor Signal
No. 30 Knock Sensor Signal
No. 31 Knock Sensor Signal
No. 32 Knock Sensor Signal
No. 33 Cylinder No. 1 Fuel Injection Valve Signal
No. 34 Cylinder No. 2 Fuel Injection Valve Signal
No. 35 Cylinder No. 3 Fuel Injection Valve Signal
No. 36 Cylinder No. 4 Fuel Injection Valve Signal
No. 37 Cylinder No. 5 Fuel Injection Valve Signal
No. 38 Cylinder No. 6 Fuel Injection Valve Signal
No. 39 Oil Level Sensor Signal
No. 40 VANOS Inlet Valve Signal
No. 41 VANOS Outlet Valve Signal
No. 42 Evaporative Emission Valve Signal
No. 43 Throttle Valve Signal
No. 44 Throttle Valve Signal
No. 45 Characteristic MAP Cooling Signal
No. 46 Idle Speed Control Valve Signal Closed
No. 47 Idle Speed Control Valve Signal Open
No. 48 Knock Sensor Shield Signal
No. 49 Individual Control Intake System Signal Valve
No. 50-51 Not Used
No. 52 Secondary Air Injection Pump Valve Signal
Fig 4: Identifying PCM 52-Pin Connector (E46)
G99D05495Courtesy of BMW OF NORTH AMERICA, INC.
PCM 40-PIN CONNECTOR TERMINAL IDENTIFICATION (E46)

Terminal Signal Type
No. 1 Battery Charge Indicator Light Signal
No. 2 Engine Start Signal Feedback
No. 3 Secondary Air Injection Pump Signal
No. 4 Electric Fan Signal
No. 5-9 Not Used
No. 10 Fuel Pump Relay No. 1 Signal
No. 11 Oil Pressure Switch Signal
No. 12-16 Not Used
No. 17 Speed Signal
No. 18 Not Used
No. 19-20 Not Used
No. 21 Oil Level Sensor Signal
No. 22 Right Rear Wheel Speed Signal
No. 23 Clutch Pedal Position Switch Signal
No. 24 Brake Light Switch Signal
No. 25 Not Used
No. 26 To Fuse F29
No. 27 Multifunction Steering Wheel Voltage Supply
No. 28 Brake Light Switch Signal
No. 29 A/C Compressor Signal Relay
No. 30 Leakage Diagnosis Pump Signal
No. 31 Not Used
No. 32 Data Link Connector
No. 33 Electronic Vehicle Immobilization
No. 34 Leakage Diagnosis Pump Signal
No. 35 Not Used
No. 36 CAN Bus High Signal
No. 37 CAN Bus Low Signal
No. 38 Coolant Outlet Temperature Ground
No. 39 Coolant Outlet Temperature Signal
No. 40 Not Used
Fig 5: Identifying PCM 40-Pin Connector (E46)
G99F05496Courtesy of BMW OF NORTH AMERICA, INC.
PCM 9-PIN CONNECTOR TERMINAL IDENTIFICATION (E46)

Terminal Signal Type
No. 1 Ignition Coil No. 3 Signal
No. 2 Ignition Coil No. 2 Signal
No. 3 Ignition Coil No. 1 Signal
No. 4 Not Used
No. 5-6 Ground
No. 7 Ignition Coil No. 6 Signal
No. 8 Ignition Coil No. 5 Signal
No. 9 Ignition Coil No. 4 Signal
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