Signal description. MSA 15.8
General
All values given below are between the respective terminal in column 1 and terminal #A53 (power ground) unless otherwise stated in brackets after the entry. Control module terminals #A1-#A60 correspond to terminals #A1-#60 on the breakout box, #A61-#A70 correspond to terminals #B1-#B10 on the breakout box and terminals #B1-#B50 correspond to terminals #B10-#B60 on the breakout box.
NOTE:
It is important to connect the breakout box and check the ground terminals before taking readings.
HINT: If the numbering of the connector is different from the numbering on the breakout box, the connector number is given first, terminal #A61, followed by the breakout box number in brackets, (terminal #B1).
HINT: Example: #A61 (#B1)
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | % duty = | Duty cycle (pulse ratio) as a percentage (%) |
| t = | Time in milliseconds (ms) |
| Terminal | Breakout box | Signal type | Ignition on | Engine idling | Other |
| #A1 | #A1 | - | - | - | |
| #A2 | #A2 | EGR converter, control signal | Ubat | Ubat | During control, a single pulsed signal between approximately 0V and Ubat with a fixed frequency and variable pulse ratio. Pulse ratio increases with exhaust gas recirculation |
| #A3 | #A3 | Fuel temperature sensor, signal | Cold fuel (+10 degrees C) U=4.2V Cold fuel (+20 degrees C) U=3.9V Warm fuel (+50 degrees C) U=2.7V Warm fuel (+80 degrees C) U=1.6V |
The voltage decreases with increasing temperature | The voltage decreases with increasing temperature |
| #A4 | #A4 | Engine coolant temperature (ECT) sensor, signal | Cold engine (+10 degrees C) U=4.2V Warm engine (+80 degrees C) U=1.6V Warm engine (+100 degrees C) U=1.2V |
The voltage decreases with increasing temperature | The voltage decreases with increasing temperature |
| #A5 | #A5 | Intake air temperature (IAT) sensor, signal | +10 degrees C U=4.1V +30 degrees C U=3.3V +50 degrees C U=2.5V +80 degrees C U=1.5V |
The voltage decreases with increasing temperature | The voltage decreases with increasing temperature |
| #A6 | #A6 | - | - | - | |
| #A7 | #A7 | Control signal to and from the engine cooling fan control module | f=100Hz pulse ratio= 10-95% |
f=100Hz pulse ratio= 10-95% |
Pulsed signal between Ubat and Ulow with fixed frequency and variable pulse ratio |
| #A8 | #A8 | - | - | - | |
| #A9 | #A9 | Needle lift sensor, signal | U=3.2V | U=3.2V | Direct current with retained alternating current when the needle is lifted. |
| #A10 | #A10 | - | - | - | |
| #A11 | #A11 | Engine coolant heater relay 1, control signal | Relay activated: Ulow Relay not activated Ubat |
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| #A12 | #A12 | Engine coolant heater relay 2+3, control signal | Relay activated: Ulow Relay not activated Ubat |
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| #A13 | #A13 | Engine pads valve, control signal | When regulating | ||
| #A14 | #A14 | Injection timing valve, control signal | During control, a pulsed signal between approximately 0V and Ubat with a fixed frequency and variable pulse ratio. The pulse ratio decreases with earlier injection timing | ||
| #A15 | #A15 | Fuel shut-off valve, control signal | Valve activated: Ubat Valve not activated: Ulow |
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| #A16 | #A16 | Power supply control module (from system relay) | U = Ubat | U = Ubat | |
| #A17 | #A17 | Power supply control module (from system relay) | U = Ubat | U = Ubat | |
| #A18 | #A18 | Power supply control module (from system relay) | U = Ubat | U = Ubat | |
| #A19 | #A19 | - | - | - | |
| #A20 | #A20 | Generator (GEN) load signal | Ulow | During charging, a pulsed signal between Ulow and Ubat with variable frequency and pulse ratio. The pulse ratio decreases and frequency increases as charging increases | |
| #A21 | #A21 | - | - | - | |
| #A22 | #A22 | Mass air flow (MAF) sensor, signal | U=1.0V | approximately 1.8 V | |
| #A23 | #A23 | - | - | - | |
| #A24 | #A24 | - | - | - | |
| #A25 | #A25 | - | - | - | |
| #A26 | #A26 | Oil pressure switch, signal | U=Ulow | U = Ubat | |
| #A27 | #A27 | - | - | - | |
| #A28 | #A28 | Needle lift sensor, signal ground | U=Ulow | U=Ulow | |
| #A29 | #A29 | - | - | - | |
| #A30 | #A30 | - | - | - | |
| #A31 | #A31 | - | - | - | |
| #A32 | #A32 | - | - | - | |
| #A33 | #A33 | - | - | - | |
| #A34 | #A34 | - | - | - | |
| #A35 | #A35 | Fuel regulator, control signal | U = Ubat | ||
| #A36 | #A36 | - | - | - | |
| #A37 | #A37 | - | - | - | |
| #A38 | #A38 | Turbocharger (TC) control valve, control signal | U = Ubat | ||
| #A39 | #A39 | Power supply air conditioning (A/C) linear pressure sensor | U=5 V | ||
| #A40 | #A40 | - | - | - | |
| #A41 | #A41 | Power supply, fuel regulator position sensor | U=2.5V AC=0.7-0.8V |
Direct current with retained alternating current. | Direct current with retained alternating current. |
| #A42 | #A42 | Fuel regulator position sensor, signal | U=2.5V | ||
| #A43 | #A43 | Power supply, fuel regulator position sensor | U=2.5V AC=0.4-0.5V |
Direct current with retained alternating current which increases with increased injected fuel volume | Direct current with retained alternating current which increases with increased injected fuel volume |
| #A44 | #A44 | - | - | - | |
| #A45 | #A45 | - | - | - | |
| #A46 | #A46 | - | - | - | |
| #A47 | #A47 | - | - | - | |
| #A48 | #A48 | Engine speed (RPM) sensor, signal | Ulow | When the engine is running: alternating current which increases in frequency and amplitude with engine speed (RPM) | When the engine is running: alternating current which increases in frequency and amplitude with engine speed (RPM) |
| #A49 | #A49 | - | - | - | |
| #A50 | #A50 | - | - | - | |
| #A51 | #A51 | - | - | - | |
| #A52 | #A52 | - | - | - | |
| #A53 | #A53 | Power ground 3 | Ulow | Measured to battery negative terminal | Measured to battery negative terminal |
| #A54 | #A54 | Power ground 4 | Ulow | Measured to battery negative terminal | Measured to battery negative terminal |
| #A55 | #A55 | - | - | - | |
| #A56 | #A56 | - | - | - | |
| #A57 | #A57 | - | - | - | |
| #A58 | #A58 | Mass air flow (MAF) sensor, ground | U=Ulow | ||
| #A59 | #A59 | Mass air flow (MAF) sensor power supply | U=5 V | ||
| #A60 | #A60 | Engine coolant temperature (ECT) sensor, ground | |||
| #A61 | #B1 | Fuel temperature sensor, ground | U=Ulow | ||
| #A62 | #B2 | - | - | - | |
| #A63 | #B3 | Signal ground | U=Ulow | ||
| #A64 | #B4 | - | - | - | |
| #A65 | #B5 | - | - | - | |
| #A66 | #B6 | Engine speed (RPM) sensor, signal ground | U=Ulow | ||
| #A67 | #B7 | A/C linear pressure sensor, ground | U=Ulow | ||
| #A68 | #B8 | A/C linear pressure sensor, signal | U =1V | Voltage increases with the pressure in the A/C system | Voltage increases with the pressure in the A/C system |
| #A69 | #B9 | - | - | - | |
| #A70 | #B10 | - | - | - |
| Terminal | Breakout box | Signal type | Ignition on | Engine idling | Other |
| #B1 | #B11 | CAN-L | 2-3V | ||
| #B2 | #B12 | - | - | - | |
| #B3 | #B13 | Control area network (CAN) screen | |||
| #B4 | #B14 | Ground for clutch position sensor, brake position sensor | U=Ulow | ||
| #B5 | #B15 | Analog accelerator pedal (AP) | U=Ulow | ||
| #B6 | #B16 | - | - | - | |
| #B7 | #B17 | - | - | - | |
| #B8 | #B18 | Engine coolant level switch, signal | |||
| #B9 | #B19 | Accelerator pedal (AP) position sensor power supply, analog sensor | U =5 V | ||
| #B10 | #B20 | - | - | - | |
| #B11 | #B21 | - | - | - | |
| #B12 | #B22 | - | - | - | |
| #B13 | #B23 | CAN-H | 2-3V | ||
| #B14 | #B24 | - | - | - | |
| #B15 | #B25 | Clutch position sensor, signal | Unaffected 3.1 V Fully depressed 0.9V |
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| #B16 | #B26 | Brake position sensor, signal | Unaffected 3.2 V Fully depressed 2.5 V |
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| #B17 | #B27 | Analog accelerator pedal (AP) position sensor, signal | Unaffected 0.4 V Fully depressed 4.3 V |
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| #B18 | #B28 | - | - | - | |
| #B19 | #B29 | Cruise control signal, signal "+" | |||
| #B20 | #B30 | Cruise control signal, signal "resume" | |||
| #B21 | #B31 | - | - | - | |
| #B22 | #B32 | Diagnostic lead C-link | U=90% of Ubat | ||
| #B23 | #B33 | Signal 50 from the ignition switch | |||
| #B24 | #B34 | - | - | - | |
| #B25 | #B35 | Digital accelerator pedal (AP) position sensor, signal | t=5ms pulse ratio=8-88% |
A pulsed signal between Ulow and Ubat | A pulsed signal between Ulow and Ubat |
| #B26 | #B36 | Stop lamp switch, signal | Brake pedal up: Ulow Brake pedal depressed: Ubat |
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| #B27 | #B37 | - | - | - | |
| #B28 | #B38 | - | - | - | |
| #B29 | #B39 | - | - | - | |
| #B30 | #B40 | Boost pressure sensor, ground | Ulow | ||
| #B31 | #B41 | - | - | - | |
| #B32 | #B42 | - | - | - | |
| #B33 | #B43 | - | - | - | |
| #B34 | #B44 | - | - | - | |
| #B35 | #B45 | - | - | - | |
| #B36 | #B46 | - | - | - | |
| #B37 | #B47 | Signal 15 from the ignition switch | U = Ubat | ||
| #B38 | #B48 | System relay, control signal | U=Ulow | Relay activated: Ulow Relay not activated: Ubat |
Relay activated: Ulow Relay not activated: Ubat |
| #B39 | #B49 | - | - | - | |
| #B40 | #B50 | - | - | - | |
| #B41 | #B51 | - | - | - | |
| #B42 | #B52 | Power supply, boost pressure sensor | 5V | ||
| #B43 | #B53 | Boost pressure sensor, signal | approximately 1.8 V | approximately 1.8 V | Voltage increases with engine speed (RPM) and boost pressure |
| #B44 | #B54 | A/C relay, control signal | U = Ubat | ||
| #B45 | #B55 | - | - | - | |
| #B46 | #B56 | Malfunction indicator lamp (MIL), control signal | U=Ulow | Malfunction indicator lamp (MIL) lamp lit: Ulow Malfunction indicator lamp (MIL) lamp out: Ubat |
Malfunction indicator lamp (MIL) lamp lit: Ulow Malfunction indicator lamp (MIL) lamp out: Ubat |
| #B47 | #B57 | - | - | - | |
| #B48 | #B58 | internally connected to A13 | |||
| #B49 | #B59 | Glowplug indicator lamp, control signal | Lamp lit: Ulow Lamp not lit: Ubat |
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| #B50 | #B60 | Glow plug relay, control signal | Relay activated: Ulow Relay not activated: Ubat |