939005104 - INTRODUCTION - PETROL DIRECT FUEL INJECTION SYSTEM

Bosch MED 7.6.2 engine management control unit

It allows the integrated management of the engine injection and ignition; there are two connectors, one for the engine side wiring (connector A) and one for the vehicle side wiring (connector B).ENGINE SIDE 60 PIN CONNECTOR (A)

PIN	FUNCTION
1	Ignition control earth
2	Right exhaust phase transformer solenoid
3	Right inlet phase transformer solenoid
4	Left exhaust phase transformer solenoid
5	Left inlet phase transformer solenoid
6	n.c.
7	Reference earth
8	Fuel pressure sensor signal
9	Flow meter reference earth
10	Motorized throttle position potentiometer signal (track 1)
11	Flow meter reference earth
12	Flow meter
13	Flow meter power supply
14	n.c.
15	Throttle actuator power supply
16	Earth for ignition coil modules 2-4-6
17	Injector 3 earth
18	Injector 3 power supply
19	Injector 6 power supply
20	Injector 6 earth
21	Screening earth
22	Engine coolant temperature sensor signal
23	Absolute pressure sensor signal
24	Throttle position potentiometer power supply
25	Motorized throttle position potentiometer signal (track 2)
26	Power supply for: timing sensors, fuel pressure sensor, absolute pressure sensor, oil pressure sensor
27	Intake air temperature signal (in flow meter)
28	Engine oil pressure sensor signal
29	n.c.
30	Throttle actuator earth
31	Flow rate regulator
32	Injector 2 earth
33	Injector 2 power supply
34	Injector 5 power supply
35	Injector 5 earth
36	Engine rpm and TDC sensor
37	Exhaust camshaft cylinders 1-3-5 timing sensor signal
38	Exhaust camshaft cylinders 2-4-6 timing sensor signal
39	Ignition coil 4 module control
40	Ignition coil 5 module control
41	Ignition coil 6 module control
42	n.c.
43	Detonation sensor cylinders 2-4-6
44	Detonation sensor cylinders 1-3-5
45	n.c.
46	Canister solenoid valve
47	Injector 1 earth
48	Injector 1 power supply
49	Injector 4 power supply
50	Injector 4 earth
51	Engine rpm and TDC sensor
52	Inlet camshaft cylinders 1-3-5 timing sensor signal
53	Inlet camshaft cylinders 2-4-6 timing sensor signal
54	Ignition coil 1 module control
55	Ignition coil 2 module control
56	Ignition coil 3 module control
57	n.c.
58	Detonation sensor cylinders 2-4-6
59	Detonation sensor cylinders 1-3-5
60	Shut-off solenoid valve

VEHICLE 94 PIN CONNECTOR (B)

PIN	FUNCTION
1	Earth on bodyshell
2	Earth on bodyshell
3	Power supply
4	Earth on bodyshell
5	Power supply
6	Power supply
7	n.c.
8	Petrol pump relay positive control
9	n.c.
10	n.c.
11	A/C compressor engagement request
12	Compressor engagement relay
13	n.c.
14	Brake lights control signal
15	n.c.
16	Air conditioning linear pressure sensor negative
17	n.c.
18	n.c.
19	n.c.
20	Brake lights control
21	n.c.
22	n.c.
23	n.c.
24	n.c.
25	Main relay
26	n.c.
27	n.c.
28	n.c.
29	n.c.
30	n.c.
31	Screening earth
32	Clutch pedal switch
33	Cruise control resume signal from steering column switch unit
34	Cruise control +/set signal from steering column switch unit
35	Cruise control ON activation signal from steering column switch unit
36	n.c.
37	n.c.
38	Air conditioning linear pressure sensor signal
39	n.c.
40	n.c.
41	n.c.
42	n.c.
43	Cruise control signal from steering column switch unit
44	n.c.
45	n.c.
46	n.c.
47	n.c.
48	n.c.
49	n.c.
50	Sensor downstream of catalyzer cylinders 1-3-5
51	Sensor upstream of pre-catalyzer cylinders 2-4-6
52	Sensor downstream of catalyzer cylinders 2-4-6
53	Sensor downstream of catalyzer cylinders 2-4-6
54
55	Sensor upstream of pre-catalyzer cylinders 1-3-5
56	Sensor upstream of pre-catalyzer cylinders 1-3-5
57	Sensor upstream of pre-catalyzer cylinders 2-4-6
58	Sensor upstream of pre-catalyzer cylinders 2-4-6
59	Accelerator pedal potentiometer negative (track 1)
60	Accelerator pedal potentiometer signal (track 1)
61	Power supply for: accelerator pedal potentiomter (track 1) and air conditioning linear pressure sensor
62	n. c.
63	C-CAN H (at NFR)
64	C-CAN H (at NBC)
65	n. c.
66	n. c.
67	NT/1 from CVM
68	M.I.L. warning light at NQS
69	n. c.
70	Relay feed for engine cooling fan high speed
71	n. c.
72	n. c.
73	Sensor upstream of pre-catalyzer cylinders 1-3-5
74	Sensor downstream of catalyzer cylinders 1-3-5
75	Sensor downstream of catalyzer cylinders 1-3-5
76	n. c.
77	Sensor upstream of pre-catalyzer cylinders 1-3-5
78	Sensor upstream of pre-catalyzer cylinders 1-3-5
79	Sensor upstream of pre-catalyzer cylinders 2-4-6
80	Sensor upstream of pre-catalyzer cylinders 2-4-6
81	Accelerator pedal potentiometer negative (track 2)
82	Accelerator pedal potentiometer signal (track 2)
83	Accelerator pedal potentiometer power supply (track 2)
84	n. c.
85	C-CAN L (at NFR)
86	C-CAN L (at NBC)
87	K line
88	n. c.
89	Relay feed for engine cooling fan low speed
90	n. c.
91	n. c.
92	Power supply from battery (+30)
93	W Line
94	Sensor downstream of catalyzer cylinders 2-4-6

HDP 2.5 high pressure pump

1. Low pressure fuel supply pipe connector.2. Sealing ring.3. Sealing ring, rail side.4. Pressure pump supply pipe.5. High pressure supply pipe to left rail6. High pressure connecting pipe between left and right rails7. Fuel return pipe to tank8. Fuel pipe bracket9. Fuel pipe bracket clip10. High pressure pump11. Eyelet connecting low pressure supply pipe to rail12. Shut-off solenoid valve13. High pressure pump outlet flow rate regulator14. Petrol vapour recovery from damperThe high pressure pump is fitted on the left head and is controlled by the exhaust side camshaft by means of a three lobe cam which activates a pumping element inside the pump; the pumping element is activated three times for each revolution of the camshaft.The high pressure pump has a diaphragm damper connected with the low pressure supply chamber to limit the supply duct impulses. The petrol vapours that are produced at this damper are collected in a special pipe which is later connected to the fuel return pipe to the tank.1. Low pressure supply (6 bar)2. High pressure supply3. Fuel return to the tank4. Flow rate regulatorThe diagram of the pump above highlights the contact points between the removable parts in red, the connection points with the metal seals or plastic deflectors in green and the location of the internal o-rings in blue.The flow rate regulator, controlled by the control unit, which has the task of regulating the fuel high pressure, is located on the pressure pump.

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