Direct Ignition System (DIS)
- Ensure ignition is turned off before working on the ignition system. The engine will not start without a connected secondary circuit. When checking compression, remove Digital Motor Electronics (DME) Electronic Control Unit (ECU) relay. See «DME & FUEL PUMP RELAY LOCATION»(ref-10054-S29433286292000110700000) .
- Shielded capacitors may not be connected to terminal No. 1 of the ignition coil. Terminal No. 1 of the ignition coil may not be connected to ground or battery positive terminal, as this will damage ignition stages in DME control unit.
- DO NOT connect DVOM or test light to terminal No. 1 of ignition coil while engine is running. High tension (350 volts) is present at coil terminal No. 4, secondary ignition leads, spark plugs and ignition coil terminal No. 1 to DME Electronic Control Unit (ECU).
Note. For location of DME master and fuel pump relays, see DME & FUEL PUMP RELAY LOCATION under FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEM.
ENGINE CONTROL UNIT (ECU)
Note. Disconnect battery before removing Digital Motor Electronics (DME) ECU. Disconnecting battery will clear ECU Diagnostic Trouble Codes (DTCs). Retrieve DTCs before disconnecting battery. ECU stores certain basic driveability values. ECU also receives different input values, depending on engine condition, which are compared with stored values. ECU adaptive system compares input values with stored values. ECU replacement could cause poor engine performance before all values are adapted to engine condition. Before exchanging ECU, ensure engine is at normal operating temperature. Remove old ECU, install new ECU and operate vehicle at different RPMs.
FUEL SYSTEM
| WARNING | Always relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. |
3-Series (E36)
Filter on firewall of vehicle: Remove cover from fuel filter. Disconnect fuel delivery line with special tool 13 3 010 before and after the fuel filter. Unfasten hose clips and remove fuel line from fuel filter.
Scheme 25
| CAUTION | Catch and dispose off escaping fuel. |
Unfasten screw and remove filter from bracket. Filter on underbody of vehicle: Unfasten screws and remove cover from fuel filter. Disconnect fuel inlet line at points (1) and (2) with special tool 13 3 010.
Scheme 26
| CAUTION | Catch and dispose off escaping fuel. |
Unfasten hose clips and remove fuel line from fuel filter. Fuel filter with quick release coupling. Push lock toward filter while pulling off fuel hose. Unfasten screw and remove filter from bracket.
Scheme 27
Installation: Check direction of flow (arrow). Arrow must point towards the injection valve strip.
Scheme 28
M52, M60, M62 & M73 (Except E36)
Switch off ignition. Unfasten screws on lower trim (1).
Scheme 29
Fold lower trim to one side.
Scheme 30
Disconnect fuel lines with special tool 13 3 010. Catch and dispose of escaping fuel.
Scheme 31
Illustrated here without lower trim: Unfasten hose clips. Replace hose clips.
Scheme 32
Unfasten screws. Remove fuel filter. Replace fuel filter.
Scheme 33
Installation: Note installation direction of fuel filter. Direction of flow is marked with an arrow on the fuel filter. The arrow points towards the injector strip.
Scheme 34
The embossed designation "OUT " on outlet of fuel filter must be mounted facing the injector strip.
Scheme 35
FUEL SYSTEM PRESSURE RELEASE
Fuel system pressure release procedure not available from manufacturer. It may be possible to remove fuel pump relay, start engine, and run engine until fuel pressure drops (engine stalls). See DME & FUEL PUMP RELAY LOCATION .
| Application | Location | |
|---|---|---|
| Z3 | ||
| DME Relay | Under Left Side Of Instrument Panel, Next To Kick Panel | |
| Fuel Pump Relay | Right Rear Corner Of Engine Compartment, Next To DME ECU | |
| 3-Series (1) | ||
| DME & Fuel Pump Relays | Left Rear Corner Of Engine Compartment, In Relay Box | |
| 5-Series & 7-Series | ||
| DME Relay | Right Rear Corner Of Engine Compartment, Next To DME ECU | |
| Fuel Pump Relay | Right Side Of Trunk | |
| 8-Series | ||
| DME & Fuel Pump Relays | Right Rear Corner Of Engine Compartment, Next To DME ECU | |
| (1) (Scheme 36)and (Scheme 37). | ||
| (1) | (Scheme 36)and (Scheme 37). |
DME & FUEL PUMP RELAY LOCATION
