Signal Specification, Engine Control Module (ECM)
General
All the values given below apply between the respective terminal (column 1) and power ground (#C2, #C4 or #C6 on the breakout box). If this is not the case, it is indicated within brackets.
NOTE:
Connect the breakout box and check the ground connections before starting to measure.
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage in volts (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds (s) |
| PWM = | Pulse-width modulation |
Connector A
Connector A (96-pin) corresponds to terminals #A1 - #B36 on the breakout box.
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Engine idling | Miscellaneous |
| #A1 | #A1 | - | - | - | |
| #A2 | #A2 | - | - | - | |
| #A3 | #A3 | - | - | - | |
| #A4 | #A4 | - | - | - | |
| #A5 | #A5 | - | - | - | |
| #A6 | #A6 | Impulse sensor, signal (-) | U=Ulow | Measured to terminal #A30 (#A30). | |
| #A7 | #A7 | Camshaft sensor intake, ground | U = Ulow | U = Ulow | |
| #A8 | #A8 | Camshaft sensor exhaust, ground | U = Ulow | U = Ulow | |
| #A9 | #A9 | Front heated oxygen sensor (HO2S), bank 1, signal (+) | λ = 1 when current is 0 mA | Measurement range 0 ± 12 mA. Negative current indicates a rich fuel/air mixture. |
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| #A10 | #A10 | Front heated oxygen sensor (HO2S), bank 1, signal (-) | λ = 1 when current is 0 mA | Measurement range 0 ± 12 mA. Negative current indicates a rich fuel/air mixture. |
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| #A11 | #A11 | Camshaft sensor intake, supply voltage | U = 5 V | U = 5 V | |
| #A12 | #A12 | Camshaft sensor exhaust, supply voltage | U = 5 V | U = 5 V | |
| #A13 | #A13 | Engine coolant temperature (ECT) sensor, signal | (+30 °C) U = 1.22 V (+80 °C) U = 0.29 V (+100 °C) U = 0.17 V |
(+30 °C) U = 1.22 V (+80 °C) U = 0.29 V (+100 °C) U = 0.17 V |
U drops with increased engine coolant temperature. |
| #A14 | #A14 | Mass air flow (MAF) sensor, signal ground | U = Ulow | U = Ulow | |
| #A15 | #A15 | - | - | - | |
| #A16 | #A16 | - | - | - | |
| #A17 | #A17 | Electronic throttle module (ETA), ground | U = Ulow | U = Ulow | |
| #A18 | #A18 | Rear heated oxygen sensor (HO2S), bank 1, signal (-). | |||
| #A19 | #A19 | Knock sensor (KS) bank 1, signal (-) | U=Ulow | ||
| #A20 | #A20 | Knock sensor (KS) bank 2, signal (-) | U=Ulow | ||
| #A21 | #A21 | Fuel temperature/fuel pressure sensor, ground | U = Ulow | U = Ulow | |
| #A22 | #A22 | Mass air flow (MAF) sensor, signal ground | U = Ulow | U = Ulow | |
| #A23 | #A23 | Manifold absolute pressure (MAP) sensor, ground | U = Ulow | U = Ulow | |
| #A24 | #A24 | Manifold absolute pressure (MAP) sensor, supply voltage | U = 5 V | ||
| #A25 | #A25 | - | - | - | |
| #A26 | #A26 | - | - | - | |
| #A27 | #A27 | - | - | - | |
| #A28 | #A28 | - | - | - | |
| #A29 | #A29 | - | - | - | |
| #A30 | #A30 | Impulse sensor, signal (+) | U=Ulow | U = sinus voltage U≈1.7 to 1.9 V |
Measured to terminal #A6 (#A6). The voltage increases with increased engine speed (rpm). |
| #A31 | #A31 | Front heated oxygen sensor (HO2S), bank 2, signal (+) | λ = when current is 0 mA | Measurement range 0 ± 12 mA. Negative current indicates a rich fuel/air mixture. |
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| #A32 | #A32 | Front heated oxygen sensor (HO2S), bank 2, signal (-) | λ = when current is 0 mA | Measurement range 0 ± 12 mA. Negative current indicates a rich fuel/air mixture. |
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| #A33 | #A33 | Exhaust camshaft position (CMP) sensor, signal | U = 5 V or Ulow | U= pulsed signal Umax. > 4.5 V Umin. < 1 V |
Measure against #A8 (#A8). The frequency varies with engine rpm. Measure with advanced measuring tool. |
| #A34 | #A34 | Intake camshaft position (CMP) sensor, signal | U = 5 V or Ulow | U= pulsed signal Umax. > 4.5 V Umin. < 1 V |
Measure against #A7 (#A7). The frequency varies with engine rpm. Measure with advanced measuring tool. |
| #A35 | #A35 | - | - | - | |
| #A36 | #A36 | - | - | - | |
| #A37 | #A37 | - | - | - | |
| #A38 | #A38 | Actuator variable intake upper, control signal | |||
| #A39 | #A39 | Actuator variable intake lower, control signal | |||
| #A40 | #A40 | Rear heated oxygen sensor (HO2S), bank 1, signal (+) | λ = 1 at approx. 700 mV λ > 1 at approx. 200 mV |
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| #A41 | #A41 | Rear heated oxygen sensor (HO2S), bank 2, signal (+) | λ = 1 at approx. 700 mV λ > 1 at approx. 200 mV |
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| #A42 | #A42 | Knock sensor (KS) bank 1, signal (+) | U = 2.5 V | Measured to terminal #A19 (#A19). | |
| #A43 | #A43 | Knock sensor (KS) bank 2, signal (+) | U = 2.5 V | Measured to terminal #A20 (#A20). | |
| #A44 | #A44 | - | - | - | |
| #A45 | #A45 | Rear heated oxygen sensor (HO2S) bank 2, ground | U = Ulow | U = Ulow | |
| #A46 | #A46 | Fuel temperature sensor, signal | Measurement range: -40 to +130 °C. | ||
| #A47 | #A47 | Fuel temperature/fuel pressure sensor, supply voltage | U = 5 V | ||
| #A48 | #A48 | Electronic throttle module (ETA), voltage feed | U = 5 V | U = 5 V | |
| #A49 | #A49 | - | - | - | |
| #A50 | #A50 | - | - | - | |
| #A51 | #A51 | - | - | - | |
| #A52 | #A52 | - | - | - | |
| #A53 | #A53 | - | - | - | |
| #A54 | #A54 | - | - | - | |
| #A55 | #A55 | - | - | - | |
| #A56 | #A56 | Ignition coil cyl 4, control signal | U=Ulow | Utop = 12 V pulse ratio 30% f=240 Hz | Pulse ratio and frequency increases with increased engine speed (rpm) |
| #A57 | #A57 | Ignition coil cyl 2, control signal | U=Ulow | Utop = 12 V pulse ratio 30% f=240 Hz | Pulse ratio and frequency increases with increased engine speed (rpm) |
| #A58 | #A58 | Ignition coil cyl 6, control signal | U=Ulow | Utop = 12 V pulse ratio 30% f=240 Hz | Pulse ratio and frequency increases with increased engine speed (rpm) |
| #A59 | #A59 | Ignition coil cyl 3, control signal | U=Ulow | Utop = 12 V pulse ratio 30% f=240 Hz | Pulse ratio and frequency increases with increased engine speed (rpm) |
| #A60 | #A60 | Ignition coil cyl 5, control signal | U=Ulow | Utop = 12 V pulse ratio 30% f=240 Hz | Pulse ratio and frequency increases with increased engine speed (rpm) |
| #B1 | #A61 | Ignition coil cyl 1, control signal | U=Ulow | Utop = 12 V pulse ratio 30% f=240 Hz | Pulse ratio and frequency increases with increased engine speed (rpm) |
| #B2 | #A62 | Misfire signal | Pulse width modulation (PWM) signal, for ignition coil cyl. 1, 4 and 6 | ||
| #B3 | #A63 | Oil level and oil temperature sensor, signal | Pulse width modulation (PWM) signal | ||
| #B4 | #A64 | - | - | - | |
| #B5 | #A65 | Electronic throttle module (ETA), throttle position sensor circuit 1, signal | Unaffected: U≈0.8 V Fully depressed accelerator pedal: U≈4 V |
Voltage varies depending on the position of the throttle. Voltage increases with increased throttle opening. | |
| #B6 | #A66 | Intake air temperature (IAT) sensor signal | (+20 °C) U = 3.50 V (+30 °C) U = 3.00 V (+40 °C) U = 2.50 V |
(+20 °C) U = 3.50 V (+30 °C) U = 3.00 V (+40 °C) U = 2.50 V |
The intake air temperature (IAT) sensor is integrated in the mass air flow (MAF) sensor. |
| #B7 | #A67 | Electronic throttle module (ETA), throttle position sensor circuit 2, signal | Unaffected: U≈1.7 V Fully depressed accelerator pedal: U≈4.1 V |
Voltage varies depending on the position of the throttle. Voltage increases with increased throttle opening. | |
| #B8 | #A68 | Engine coolant temperature (ECT) sensor, signal | (+30 °C) U = 1.22 V (+80 °C) U = 0.29 V (+100 °C) U = 0.17 V |
(+30 °C) U = 1.22 V (+80 °C) U = 0.29 V (+100 °C) U = 0.17 V |
U drops with increased engine coolant temperature. |
| #B9 | #A69 | Manifold absolute pressure (MAP) sensor, signal | U≈3.7 V at 1000 mbar | ||
| #B10 | #A70 | Mass air flow (MAF) sensor, signal | U≈0.6 V | U≈1.4 V | U increases with increasing air mass |
| #B11 | #A71 | Fuel pressure sensor, signal | |||
| #B12 | #A72 | - | - | - | |
| #B13 | #A73 | Power supply from system relay | U = Ubat | U = Ubat | |
| #B14 | #A74 | Electronic Throttle Module (ETA) engine, control signal (-) | Idle = -1.5 V Full speed = 2 V |
Pulse width modulation (PWM) signal. Utop = Ubat Pulse ratio 0-100% The polarity of the control signal switches when the damper motor is to be deployed in the opposite direction. |
The damper motor is controlled using a pulse width modulation (PWM) signal from the integrated power stage in the engine control module (ECM) measured to terminal #A75. |
| #B15 | #A75 | Electronic Throttle Module (ETA) engine, control signal (+) | Idle = -1.5 V Full speed = 2 V |
Pulse width modulation (PWM) signal. Utop = Ubat Pulse ratio 0-100% The polarity of the control signal switches when the damper motor is to be deployed in the opposite direction. |
The damper motor is controlled using a pulse width modulation (PWM) signal from the integrated power stage in the engine control module (ECM) measured to terminal #A74. |
| #B16 | #A76 | Front heated oxygen sensor (HO2S) bank 1 preheating, control signal | Utop = 12 V pulse ratio 30 - 60 % f=8 Hz | Pulsed 12 V-signal. | |
| #B17 | #A77 | Front heated oxygen sensor (HO2S) bank 2 preheating, control signal | Utop = 12 V pulse ratio 30 - 60 % f=8 Hz | Pulsed 12 V-signal. | |
| #B18 | #A78 | Injector 1, control signal | U = Ubat | t = 2-3 ms | t increases with engine speed and load |
| #B19 | #A79 | Injector 5, control signal | U = Ubat | t = 2-3 ms | t increases with engine speed and load |
| #B20 | #A80 | Injector 3, control signal | U = Ubat | t = 2-3 ms | t increases with engine speed and load |
| #B21 | #A81 | Injector 6, control signal | U = Ubat | t = 2-3 ms | t increases with engine speed and load |
| #B22 | #A82 | Injector 2, control signal | U = Ubat | t = 2-3 ms | t increases with engine speed and load |
| #B23 | #A83 | Injector 4, control signal | U = Ubat | t = 2-3 ms | t increases with engine speed and load |
| #B24 | #A84 | Evaporative emission system (EVAP) valve, control signal (signal ground) | U = Ubat | Pulse width modulation (PWM) signal during opening (control) of the evaporative emission system (EVAP) valve. The pulse ratio varies with regulating. | |
| #B25 | #A85 | Variable A/C compressor, control signal | Utop = 12 V pulse ratio 30 - 75 % f=400 Hz | Pulsed 12 V-signal. | |
| #B26 | #A86 | Reset valve camshaft intake (VVT), control signal | Pulse width modulation (PWM) signal Utop = Ubat f = 300 Hz Pulse ratio 5% |
The pulse ratio varies during regulation. | |
| #B27 | #A87 | - | - | - | |
| #B28 | #A88 | Rear heated oxygen sensor preheating bank 1, control signal | Utop
= 12 V Pulse ratio 30 - 60 % |
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| #B29 | #A89 | Rear heated oxygen sensor preheating bank 2, control signal | Utop
= 12 V Pulse ratio 30 - 60 % |
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| #B30 | #A90 | Cam profile solenoid 1, control signal | U = Ubat | U = Ubat | |
| #B31 | #A91 | Cam profile solenoid 2, control signal | U = Ubat | U = Ubat | |
| #B32 | #A92 | LIN signal, alternator | |||
| #B33 | #A93 | - | - | - | |
| #B34 | #A94 | - | - | - | |
| #B35 | #A95 | - | - | - | |
| #B36 | #A96 | - | - | - | |
Connector B
Connector B (58-pin) corresponds to terminals #C1 - #58 on the breakout box.
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Engine idling | Miscellaneous |
| #C1 | #B1 | - | - | - | |
| #C2 | #B2 | Power ground | U = Ulow | U = Ulow | Ground terminal connected to chassis. |
| #C3 | #B3 | Power supply from system relay | U = Ubat | U = Ubat | |
| #C4 | #B4 | Power ground | U = Ulow | U = Ulow | Ground terminal connected to chassis. |
| #C5 | #B5 | Power supply from system relay | U = Ubat | U = Ubat | |
| #C6 | #B6 | Power ground | U = Ulow | U = Ulow | Ground terminal connected to chassis. |
| #C7 | #B7 | - | - | - | |
| #C8 | #B8 | Cooling fan control module, control signal | Pulse width modulation (PWM) signal to engine cooling fan (FC) control module | ||
| #C9 | #B9 | Start relay, signal (-) | U = Ubat | U = Ubat | |
| #C10 | #B10 | Air conditioning (A/C) relay, control signal (signal ground) | |||
| #C11 | #B11 | Starter relay, control signal (+) | U = Ubat | U = Ubat | |
| #C12 | #B12 | - | - | - | |
| #C13 | #B13 | Automatic: Transmission control module (TCM), signal gear position. Manual: Clutch pedal switch |
With P/N connected: U = Ulow With P/N disconnected U = Ubat |
Grounded in the transmission control module (TCM) when in P/N. | |
| #C14 | #B14 | Power supply (wake up, 15-feed | U = Ubat | U = Ubat | |
| #C15 | #B15 | Start, signal 50-feed | U = Ubat | U = Ubat | Ignition off: U = Ulow |
| #C16 | #B16 | Supply from B+ | U = Ubat | U = Ubat | |
| #C17 | #B17 | Start, signal 15-feed | U = Ubat at crank | The engine control module (ECM) requests engine starting via the central electronic module (CEM). | |
| #C18 | #B18 | - | - | - | |
| #C19 | #B19 | - | - | - | |
| #C20 | #B20 | - | - | - | |
| #C21 | #B21 | Fuel pump (FP) control module (PEM), control signal | Control signal (PWM) from electronic control module (ECM) to fuel pump control module (PEM). Fuel pump control module (PEM) controls the fuel pump in turn. | ||
| #C22 | #B22 | - | - | - | |
| #C23 | #B23 | - | - | - | |
| #C24 | #B24 | - | - | - | |
| #C25 | #B25 | - | - | - | |
| #C26 | #B26 | Accelerator pedal (AP) position sensor, PWM signal | PWM signal Utop =Ubat t=5 ms pulse ratio 8 - 88 % | Pulse width modulation (PWM) signal Utop =Ubat t=5 ms pulse ratio 6-14% | The PWM signal from the accelerator pedal (AP) position sensor to the engine control module (ECM). The pulse ratio increases as the accelerator pedal (AP) is depressed. |
| #C27 | #B27 | System relay, control signal | U=Ulow | Engine control module (ECM) grounds with ignition on and releases after afterrun. | |
| #C28 | #B28 | - | - | - | |
| #C29 | #B29 | - | - | - | |
| #C30 | #B30 | Brake light switch | |||
| #C31 | #B31 | A/C high pressure sensor, power supply | U = 5 V | ||
| #C32 | #B32 | - | - | - | |
| #C33 | #B33 | - | - | - | |
| #C34 | #B34 | Outside temperature sensor, ground | U=Ulow | ||
| #C35 | #B35 | Outside temperature sensor, Signal | (0 °C) U=2.92 V (+10 °C) U=2.40 V (+20 °C) U=1.90 V (+30 °C) U=1.46 V |
Temperature range: -40 to +130 °C ref: 1.87 V at 21 °C |
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| #C36 | #B36 | - | - | - | |
| #C37 | #B37 | - | - | - | |
| #C38 | #B38 | - | - | - | |
| #C39 | #B39 | - | - | - | |
| #C40 | #B40 | - | - | - | |
| #C41 | #B41 | Communication cable control modules (HS-CAN L) | |||
| #C42 | #B42 | - | - | - | |
| #C43 | #B43 | - | - | - | |
| #C44 | #B44 | - | - | - | |
| #C45 | #B45 | Leak diagnostic unit, preheating, control signal | Heating element activated: U = Ulow Heating element not activated: U = Ubat Certain markets only. |
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| #C46 | #B46 | Leak diagnostic unit valve, control signal | Valve activated: U = Ulow Valve not activated: U = Ubat Certain markets only. |
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| #C47 | #B47 | - | - | - | |
| #C48 | #B48 | - | - | - | |
| #C49 | #B49 | - | - | - | |
| #C50 | #B50 | - | - | - | |
| #C51 | #B51 | A/C high pressure sensor, signal | U = 1.4 V | The voltage increases with increased pressure. | |
| #C52 | #B52 | - | - | - | |
| #C53 | #B53 | A/C high pressure sensor, ground | U=Ulow | ||
| #C54 | #B54 | Communication cable control module (HS-CAN H) | |||
| #C55 | #B55 | - | - | - | |
| #C56 | #B56 | - | - | - | |
| #C57 | #B57 | - | - | - | |
| #C58 | #B58 | - | - | - |