| All values measured to ground unless otherwise noted | |||
| N3/10 | |||
| C.28 | Air pump activation signal output | Disconnect ECT sensor and connect 2.5 KOhms resistor across pin 1 and 4 of B11/4 plug engine at idle, measure to circuit 87 pin A.2 12 VDC while pump is running (approx. 2 min) |
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| D.3 | Starter activation ground signal output, energizes relay K40/4k2 | Ignition on 0 VDC 12 VDC when starter turning |
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| D.11 | CAN-Bus (high side). High speed data transfer bus input and output, shares data with other ECMs | No reliable test. Check continuity to other ECMs approx. 5 VAC when data is on bus. |
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| D.12 | CAN-Bus (low side). high speed data transfer bus input and output, shares data with other ECMs | Ignition off approx. 60 Ohms between pins D.11 and D.12 |
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| E.1,2 | Pins not used | ||
| E.3 | Air flap/air filter activation signal output, controls air cleaning rate and intake air pressure | Ignition on 12 VDC Looks like noise. Ignition on, tap on block and see oscilloscope signal vary |
PWM signal |
| E.4 | Adjustable camshaft timing signal output, determines camshaft timing correction | Ignition off: 7-12 Ohms to pin A.2 Engine at approx. 2000 rpm, ECT >70 °C 1-1.5 A current draw |
Insert bridge to pin A.3 (max. 10 sec.) engine runs rough or stops |
| E.5 | EGR valve ground signal output | Connect vacuum tester. Engine at idle and ECT > 60 °C: < 1 VDC and < 10 mbar drive vehicle on rollers or road at approx. 3000 rpm: 1-7 VDC and 80-220 mbar |
 Use two technicians for road testing |
| E.6-9 | Pins not used | ||
| E.10 | Air pump switchover valve activation signal output | Ignition on, 0.4-0.6 A current draw | |
| E.11,12 | Pins not used | ||
| E.13 | Injector 4 timing signal output controls fuel injection quantity |
Use scope, probe tip to pin A.2 (circuit 87) ground to pin E.13 |
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| E.14 | Injector 2 timing signal output controls fuel injection quantity |
Use scope, probe tip to pin A.2 (circuit 87) ground to pin E.14 ECT 20 °C start engine approx. t=8 msec. ECT 80 °C engine at idle approx. t=2.7-4 msec. accelerate briefly approx. t=14 msec. |
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| E.15,16 | Pins not used | ||
| E.17 | Oil level recognition signal input activates A1e12 when oil level is low | Ignition on, oil level: OK 12 VDC low <1 VDC |
Feed to A1e12 via CAN |
| E.18-20 | Pins not used | ||
| E.21 | Magnetic supercharger clutch signal output | Ignition on, 0.4-0.6 A current draw | |
| E.22 | Pressure sensor power output | Ignition on, approx. 5 VDC to pin E.24 (-) | |
| E.23 | Pressure sensor signal input | Ignition on > 3.5 VDC engine at idle < 2 VDC connect vacuum tester > 500 mbar |
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| E.24 | Pressure sensor ground signal output | Ignition on, approx. 5 VDC to pin E.22 (+) | |
| E.25 | Injector 1 timing signal output controls fuel injection quantity |
Use scope, probe tip to pin A.2 (circuit 87) ground to pin E.25 same as pin E.13 |
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| E.26 | Injector 3 timing signal output controls fuel injection quantity |
Use scope, probe tip to pin A.2 (circuit 87) ground to pin E.26 same as pin E.13 |
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| E.27 | Pin not used | ||
| E.28 E.29 |
ECT sensor signal input, low side ECT sensor signal input, high side |
Ignition on, measure to pin E.29 (+) ECT at: 20 °C approx. 3.4 VDC 60 °C approx. 1.5 VDC 100 °C approx. 0.5 VDC |
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| E.30 | Pin not used | ||
| E.31 |
EA/CC/ISC potentiometer 1 signal input, determined by accelerator pedal position | Ignition on, measure to pin E.32 (-) accelerator pedal position CTP 4.0-4.6 VDC, WOT < CTP value |
P/O M16/1 see also pins F.1-F.2 |
| E.32 E.33 |
EA/CC/ISC potentiometer 1 and 2 power output, low side high side |
Ignition on approx. 5 VDC to pin E.33 (+) |
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| E.34 | EA/CC/ISC potentiometer 2 signal input determined by accelerator pedal position | Ignition on, measure to pin E.32 (-) accelerator pedal position CTP 0.3-0.9 VDC, WOT > CTP value |
P/O M16/1 see also pins F.1-F.2 |
| E.35,36 | Pins not used | ||
| E.37 E.38 |
CKP sensor signal input low side CKP sensor signal input high side CKP status affects injection system timing |
Start engine > 2.5 VAC, at idle > 5 VAC voltage raises with increasing rpm or use scope: sine wave 30 Vpp, t=0.7 msec. at idle |
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| E.39 E.40 |
Hall effect sensor ground signal output, low side Hall effect sensor signal input camshaft status affects injection system timing |
Engine at idle 1.2-1.7 VDC (value alternates) or use scope square wave approx. 12 Vpp, duty cycle 80 % |
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| E.41 E.42 |
Knock sensor signal input low side Knock sensor signal input high side affects ignition system timing |
Ignition on, use oscilloscope tap on engine block see signal vary (looks like noise) Piezo element generates increasing voltage with increasing knock signal |
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| E.43,44 | Pins not used | ||
| E.45 | IAT sensor signal input temperature relating voltage | Ignition on, measure to pin E.48 20 °C 2.7 VDC, 40 °C 1.8 VDC, 60 °C 1.1 VDC |
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| E.46 | Hot film MAF sensor, power supply output high side | Disconnect B2/5, measure to pin E.48 ignition on 5 VDC | |
| E.47 | Hot film MAF sensor signal input | Ignition on, measure to pin E.48 0.9-1.1 VDC engine at idle, ECT > 70 °C 1.3-1.7 VDC voltage raises with increasing rpm |
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| E.48 | MAF sensor common ground output reference point for 5 V and 12 V supply |
Disconnect B2/5, measure to B2/5 connector pin 2 Ignition on 12 VDC | |
| F.1 F.2 |
EA/CC/ISC actuator motor control signal output low side high side |
Ignition on, 0.8-2.3 VDC Engine at idle, ECT > 70 °C voltage varies from 1.0-2.5 VDC Ignition off, approx. 10 Ohms |
P/O M16/6 see also pins E.31-E.34 |
| F.3-7 | Pins not used | ||
| F.8 | Main ground to W16/6 | Approx. 0 Ohms to ground | |
| F.9-12 | Pins not used | ||
| F.13 | Ignition coil 1 signal output | Ignition on 12 VDC Starter cranks > 10 VDC |
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| F.14 | Pin not used | ||
| F.15 | Main ground to W16/6 | Approx. 0 Ohms to ground | see pin F.8 |
| F.20 | Ignition coil 2 signal output | Ignition on 12 VDC Starter cranks > 10 VDC |
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| F.21 | Pin not used | ||
| Note 1 | Input programmable - version coding - idle speed rpm adjustment - wheel perimeter adjustment - basic initial adjustment - DAS Code programming |
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