BMW 20-pin Diagnostic Socket Pin-Out Diagram

Handy pin-out diagram for the pre-OBD 20-pin round diagnostic connector on 80s and 90s BMWs from PinOutGuides.com [https://pinoutguide.com/CarElectronics/car_diag_pinout.shtml] 

 

1       Engine rotation speed [TD]
2       CAN-High     
3       CAN-Low
4       Shielding
7       Oil service and Inspection reset    
11     External starter turn on
12     Battery indicator
14     Battery power     +12V
15     ISO 9141-2 L Line     
16     Ignition +12V     
17     ISO 9141-2 K Line
18     Programming line [PGSP]
19     Ground [GND]     
20     ISO 9141-2 K Line [TXD]

 

https://pinoutguide.com/CarElectronics/car_diag_pinout.shtml

1988 E30 318i Project - Check List:

 I will update this and cross things off as progress is made:

• Straighten steering wheel.
• Speedometer / Odometer inop.
• Temperature gauge inop. [THIS POST]
• Washer-jets / pump.
• No hot air from heater-blower. [THIS POST]
• Central locking malfunction.
• Instrument lights flicker / dimmer function inop.
• Clock inop. [THIS POST]

ENGINE:

• Rough idle / stalling when cold. [THIS POST]
• Exhaust too loud. [THIS POST]
• Clutch slave-cylinder leaking.

BODYWORK:

• Paint NSF wing.
• Repair rear valance.
• Touch up valance corners.
• Panel above rear lights.
• OSR wheel arch.

E46 318ci: Total Jobs Checklist.

Sat 6.7.15:

6 months tax.

2 new front tyres.

4 new brake discs.

New master-cyl. / servo.

Fuel tank repair.

Replacement front bumper.

Sat 12.7.14:

• Re-bled brakes.
• Wynn's Engine Stop-Leak and half a litre oil.
• Rad-hose repair-tape kit, cable-tie out of way, 1 litre water/coolant.
• Cleaned wiring-connectors to cam-sensors.
• Cleared all oil residue from exhaust-manifold.

Quick run of engine with NO MAF connected gives improved idle-speed of 900rpm. After revving, it drops below 900 for a moment, then returns to 900.

Brakes are bled and still very stiff. No servo assistance is present, but the servo and m/c are known to be working. Could the problem be the vacuum pump? Could this be causing the oil leak?

If not, then it feels a little too low for the rocker-cover and will most likely be coming from the rear main-seal, which is a gearbox off job, so lets hope its just draining from one of the rear rocker-cover plugs and running down the head.

Tues 15.7.14:

Replace vacuum-pump.

Replace both camshaft-sensors.

Replace MAF sensor.

Remove inlet-manifold to check CCV and crank-sensor.

Clean oil and recondition inlet-manifold.

E46 318ci Brakes Checklist

Calipers pushing back fine, hoses not collapsed or clogged.

No fluid coming out of master cylinder itself, so brake pipes not clogged.

Fluid drains from the master-cylinder from the spout that joins to the hose that runs to the servo-housing.

Master cylinder no pressure? No visible leak.

Servo stopping master-cylinder from pressurising?

Pedal not operating?!