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ECU Pin Diagrams

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3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHECU Pin Diagrams

Leading reported evidence

Check engine mil

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

8 - Check Engine MIL

ECU Pin Diagrams
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Leading evidence: 'Check engine mil' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check engine mil' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 3 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check engine mil

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

8 - Check Engine MIL

ECU Pin Diagrams
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T225432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I'm trying to test the Motronic unit in my 1999 996 (built in Sept, 1998) and my Motronic unit is this: My scanner doesn't have ECU Pin Readouts and I've gone through all the documentation with the car and don't see a diagram. Is it possible to get a schematic for the layout without having to buy another scanner?

POST 2Original post

1 - Heating of HO2S after TWC 2 - Idle air control valve, closing coil 3 - Fuel injector, cylinder 1 4 - Fuel injector, cylinder 2 5 - Fuel injector, cylinder 3 6 - Ground point 9 7 - EVAP canister shutoff valve 8 - Check Engine MIL 9 - not assigned 10 - not assigned 11 - not assigned 12 - Crash signal (airbag) 13 - knock sensor 1 (cyl. 1-3) 14 - Medium pressure switch (A/C) 15 - Intake air temperature sensor 16 - Engine compartment temperature sensor 17 - Signal, mass air flow sensor 18 - Signal, H02S 2 ahead of TWC 19 - Signal, HO2S 1 ahead of TWC 20 - Ground, speed sender 21 - Signal, camshaft position sensor 1 + 2 22 - Ignition coil, cyl. 4 terminal 1 23 - Ignition coil, cyl. 3 terminal 1 24 - Ignition coil, cyl. 5 terminal 1 25 - Camshaft adjustment, bank 2 26 - Terminal 30 27 - Triggering of DME relay, terminal 85 28 - Ground, electronic system (shield) 29 - Idle air control valve opening coil 30 - Heating of HO2S ahead of TWC 31 - Fuel injector, cylinder 6 32 - Fuel injector, cylinder 4 33 - Fuel injector, cylinder 5 34 - Ground, sender 35 - Coolant fan, stage 1 36 - Coolant fan, stage 2 37 - Triggering of relay (terminal 85), secondary air pump 38 - Version coding (ground for Tiptronic) 39 - Fuel reserve pilot light 40 - not assigned 41 - Knock sensor 2 (cyl. 4-6) 42 - Automatic I/M test 43 - not assigned 44 - Signal, throttle position sensor 45 - Ground, mass air flow sensor 46 - Ground, oxygen sensors 47 - 5-volt supply for mass air flow sensor 48 - Nominal engine torque to TC control module 49 - Ignition coil, cyl. 1 terminal 1 50 - Ignition coil, cyl. 6 terminal 1 51 - Ignition coil, cyl. 2 terminal 1 52 - Camshaft adjustment, bank 1 53 - 5-volt supply, throttle position sensor 54 - Voltage supply for various components 55 - Ground, ignition 56 - Terminal 15 57 - not assigned 58 - Actual engine torque from TC control module 59 - Tuning flap (intake manifold switchover) 60 - Programming voltage 61 - EVAP canister purge valve 62 - A/C compressor On 63 - Triggering of fuel pump relay (terminal 85) 64 - not assigned 65 - Relay of engine compartment purge fan (terminal 85) 66 - Start-inhibit relay (terminal 85) 67 - not assigned 68 - Position switch/clutch switch 69 - A/C compressor requirement 70 - not assigned 71 - Ground, knock sensors 72 - Tank pressure sensor 73 - Oil temperature sensor 74 - Engine coolant temperature sensor 75 - not assigned 76 - Signal, H025 2 after TWC 77 - Signal, H025 1 after TWC 78 - Signal, rpm crankshaft position sensor 79 - Speed signal from ABS control module 80 - Speed signal output 81 - not assigned 82 - Coolant level 83 - Fuel gauge 84 - not assigned 85 - CAN low 86 - CAN high 87 - L wire 88 - K wire Thanks, D.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 20032034

Thanks for this, I really appreciate it.

This is a source reference. Confirm exact model applicability in the original material.