Fuel injection system Siemens «Sirius 32» (Renault Symbol 2)

Contents: Replacing the electronic control…🠛 Features of testing the electronic…🠛 Electronic control unit of the…🠛 Diagnostics of the injection system…🠛 Signal form 🠛

Note: The following describes the Siemens "Sirius 32" injection system for the K7J 700 engine; a similar system with some design differences is used for the K4J engine.

General information

Table. Main components of the Siemens "Sirius 32" injection system for the K7J 700 engine.

Name	Brand/Type	Characteristics
Control unit	SIEMENS "SIRIUS"	90 pin connector
Injection system type	-	Multi-point injection
Stepper electric motor	PHILIPS	Resistance: ＞ 53 ohms at 25°C
Throttle potentiometer	PIERBURG	It is part of the throttle valve unit Conductive path resistance: 1200±240 Ohm Resistance of moving contact: ＜ 1050 Ohm
Magnetic sensor (TDC and engine crankshaft speed)	ELECTRIFIL or SIEMENS	Resistance: 200 - 270 Ohm
Evaporative emission solenoid valve	SAGEM	Built into the adsorber Resistance: 26±4 Ohm at 23°C
Nozzle	SIEMENS	Resistance: 14.5 Ohm at 20°C Flow rate at leakage: 0.7 cm³ per minute (maximum)
Pressure sensor	DELCO ELECTRONICS	Resistance: -100 kOhm
Knock sensor	SAGEM	Piezoelectric type (tightening torque 20 Nm)
Oxygen sensor	NTK	Pins 80 (Ground) and 45 (Signal) Heater resistance: 6±1 ohm at 23°C Rich fuel mixture: ＞ 750±70 mV Lean fuel mixture: ＜ 150±50 mV
Refrigerant pressure sensor	TEXAS INSTRUMENTS	The air conditioning control unit is integrated into the injection system control unit
Ignition coil	SAGEM	Monoblock type coil with four outputs
Candles	EYQUEM	RFC50LZ2E, Tightening torque: 25 - 30 Nm
Manifold pressure at idle	-	330±40 mbar
Submersible fuel pump	-	3±0.06 bar at 80 l/h for circuit with return 3.5 bar: 160 l/h for circuit without return

Replacing the electronic control unit of the injection system

Electronic control units are supplied without codes, but ready for programming. When replacing the unit, it is necessary to enter the car code into it, and then make sure that the immobilizer system is working. To do this, simply turn on the ignition for a few seconds, and then turn it off. The immobilizer system is turned on when the key is removed.

Features of testing the electronic control unit of the injection system

Attention! Remove the key from the ignition. After 10 seconds, the immobilizer system indicator should start flashing. Cars of this model are equipped with a special type of control unit, which must be coded to ensure its operability. Therefore, it is recommended not to test electronic control units of the injection system taken from a warehouse or from another car, in order to avoid problems with coding and decoding. which can lead to failure of these control units.

Equipment for testing

It is recommended to use a universal digital multimeter for testing. It should have a high input resistance (not less than 10 kOhm/V) and measurement ranges: voltage 0-20 V, resistance 0-200 Ohm and 0-20 kOhm. In some cases, it is necessary to use an oscilloscope.

Verification procedure

Make sure the ignition is off.
Connect the test leads with contacts that match the terminal sizes to the measuring instrument.
To make the connector easier to access, remove the control unit.
To access the connector terminals from the wire side, remove the connector cover or protective cover.
Check the reliability of the control unit connector connection. - Determine the pin numbering using the connector diagram.
The measuring instrument probes must be connected to the terminals on the wire side only. One probe is connected to the connector terminal, and the other to ground or another terminal of the control unit.

Caution. Avoid short-circuiting the terminals to ground. This may cause damage to the control unit, wiring or sensors. Pay attention to the test conditions (for example: "ignition ON", "cranking" or "speed 3000 rpm"). Measure the signals at the specified terminals and compare with the magnitude or shape of the nominal signal specified in the table.

Electronic control unit of the injection system

Assignment of input/output contacts of the electronic control unit of the injection system.

1 - switch (cylinders 2 and 3)
3 - power circuit mass
4 - fuel vapor recovery system electromagnetic valve
8 - relay 1 of the electric fan unit of the coolant temperature control system
9 - Engine overheating indicator
10 - air conditioning compressor
12 - idle speed controller (contact B)
13 - coolant temperature sensor
15 - pressure sensor mass
16 - manifold pressure sensor
18 - refrigerant pressure sensor
19 - knock sensor screen
20 - knock sensor
24 - Crankshaft speed sensor
26 - diagnostics
28 - power circuit mass
29 - "+" after ignition switch
30 - "+" to ignition switch
32 - Switch (cylinders 1 and 4)
33 - power circuit mass
38 - relay 2 of the electric fan unit of the coolant temperature control system
39 - drive relay
41 Idle speed controller (contact A)
42 - idle speed controller (contact C)
43 - throttle potentiometer
45 - oxygen sensor
46 - air conditioner
49 - air temperature sensor
53 - vehicle speed sensor
54 - Crankshaft speed sensor
56 - diagnostics
58 - immobilizer
59 - injector 1
60 - nozzle 3
63 - Oxygen sensor heating
66 - "+" after ignition switch
68 - fuel pump relay
70 - information about the engine crankshaft speed
72 - idle speed controller (contact D)
73 - coolant temperature sensor mass
74 - throttle potentiometer power supply
75 - throttle potentiometer mass
77 - air temperature sensor mass
78 - pressure sensor power supply
79 - knock sensor mass
80 - oxygen sensor mass
82 - refrigerant pressure sensor mass
83 - power supply for refrigerant pressure sensor
85 - Power steering pressure sensor
89 - injector 4
90 - nozzle 2
- input signal,
- output signal

Diagnostics of the injection system SIEMENS "SIRIUS 32" (using the K4J engine as an example)

Electronic control unit connector pins

1 - control of ignition coil 2-3,
3 - power circuit mass,
4 - absorber cleaning control,
8 - control of relay 1 of the electric fan unit of the coolant temperature control system,
9 - coolant temperature lamp,
10 - air conditioning compressor control,
12 - idle speed controller control (contact B),
13 - coolant temperature sensor input,
15 - pressure sensor mass,
16 - manifold pressure sensor signal input,
18 - refrigerant pressure sensor signal,
19 - knock sensor screen,
20 - knock sensor signal input,
24 - crankshaft speed sensor signal input,
26 - diagnostics,
28 - power circuit mass,
29 - "+" after ignition switch,
30 - "+" to the ignition switch,
32 - ignition coil control 1-4,
33 - power circuit mass,
38 - control of relay 2 of the electric fan unit of the coolant temperature control system,
39 - drive relay control,
41 - idle speed controller control (contact),
42 - idle speed controller control (contact C),
43 - throttle potentiometer signal,
45 - oxygen sensor signal input,
46 - air conditioner signal,
49 - air temperature sensor input,
53 - vehicle speed input,
54 - crankshaft speed sensor signal input,
56 - diagnostics,
58 - anti-theft engine start blocking system,
59 - control of injector 1,
60 - control of injector 3,
63 - oxygen sensor heating control
66 - "+" after ignition switch,
68 - fuel pump relay control,
70 - information about engine speed TDC,
72 - idle speed controller control (contact D),
73 - coolant temperature sensor mass,
74 - throttle potentiometer power supply,
75 - throttle potentiometer mass,
77 - air temperature sensor mass,
78 - pressure sensor power supply,
79 - mass of the knock sensor,
80 - oxygen sensor mass,
82 - refrigerant pressure sensor mass,
83 - power supply of the refrigerant pressure sensor,
85 - information about the power steering pressure relay (depends on the model),
89 - control of injector 4,
90 - injector control 2

Equipment for testing

Verification procedure

Make sure the ignition is off.
Connect the test leads with contacts that match the terminal sizes to the measuring instrument.
To make the connector easier to access, remove the control unit.
To access the connector terminals from the wire side, remove the connector cover or protective cover.
Check the reliability of the control unit connector connection.
Use the connector diagram to determine the pin numbers.
The measuring instrument probes must be connected to the terminals on the wire side only. One probe is connected to the connector terminal, and the other to ground or another terminal of the control unit.

Caution! Avoid short-circuiting the terminals to ground. This may result in failure of the control unit, wiring or sensors.

Please note the test conditions (for example: "ignition ON", "cranking" or "speed 3000 rpm").
Measure the signals at the indicated terminals and compare with the nominal signal magnitude or shape given in the table.

Components/Chains	Block output	Signal	Conditions for conducting the inspection	Nominal value	Oscilloscope settings*	Signal form
Air Conditioning Compressor Clutch Relay - Some Models	10		Ignition ON.	11-14 V
	10			Engine running air conditioning OFF.	11-14 V
	10		Engine running, air conditioning ON.	0.1 V
Electronic control unit of air conditioner some models	10		Ignition ON.	11-14 V
	10		Engine running air conditioning OFF.	11-14 V
	10		Engine running, air conditioning ON.	0.1 V
	23			¦
	46		Engine running, air conditioning ON.	0 B
Air Conditioning Refrigerant Pressure Sensor - Some Models	18		Ignition ON.	0.6 V
	82		Ignition ON.	0 B
	83		Ignition ON.	5 V
Air Conditioner - Windshield Defroster Signal - Some Models	88			¦
Battery	30		Ignition OFF.	11-14 V
Crankshaft position sensor	24		Ignition ON.	1.9 V
	24		Idling	0.9 V?	1 V/1 ms	1
	54		Ignition ON.	1.9 V
	54		Idling	0.9 V?	1 V/1 ms	1
Diagnostic connector	26		Ignition ON.	0 B
Diagnostic connector	56		Ignition ON.	0 B
Weight	3		Ignition ON.	0 B
	28		Ignition ON.	0 B
	33		Ignition ON.	0 B

Components/Chains	Block output	Signal	Conditions for conducting the inspection	Nominal value	Oscilloscope settings*	Signal form
Engine Management System Relay	39		Ignition OFF.	0 B
	39		Ignition ON.	0.1 V
	66		Ignition ON.	11-14 V
Cooling Fan Motor Relay	8		Ignition ON.	11-14 V
	8		Engine running condenser fan motor OFF.	11-14 V
	8		Engine running condenser fan motor ON.	0 B
	38		Ignition ON.	11-14 V
	38		Engine running cooling fan motor OFF.	11-14 V
	38		Engine running cooling system fan motor ON.	0.1 V
High Coolant Temperature Indicator	9		Ignition ON - indicator does not light	11-14 V
	9		The engine is running, the indicator is not on	11-14 V
	9		The engine is running, the indicator is on	0 B
Coolant temperature sensor	13		Ignition ON, coolant temperature 10°C approx	3.5 V
	13		Ignition ON, coolant temperature 90°C approx	0.5 V
	73		Ignition ON.	0 B
Fuel vapor accumulator solenoid valve	4		Idling	1%
Fuel vapor accumulator solenoid valve	4		Ignition ON.	11-14 V
Fuel pump relay	68		Ignition OFF.	0 B
	68		Ignition ON.	briefly 0.9 V, then 11-14 V
	68		The engine is running	0.9 V
Heated Oxygen Sensor - Front	45		Ignition ON.	0.4 V
	45		Idling	0.1-0.9 V
	45		Idling		0.2 V/1 s	2
	63		Ignition ON.	11-14 V
	63		Idling		5V/2ms	9
	80		Ignition ON.	0 B
Heated Oxygen Sensor - Rear	44		Ignition ON.	0.4 V
	44		Idling	0.6 V
	65		Ignition ON.	11-14 V
	65		Idling		5V/2ms	9
	76		Ignition ON.	0 B

Components/Chains	Block output	Signal	Conditions for conducting the inspection	Nominal value	Oscilloscope settings*	Signal form
Idle Air Bypass Control Valve	41(72)		Idling		4V/20ms	4
	12(42)		Idling		4V/20ms	4
	12		Ignition ON.	11-14 V
	42(12)		Idling		4V/20ms	4
	72 (41)		Idling		4V/20ms	4
	41		Ignition ON.	11-14 V
	42		Ignition ON.	0.3 V
	72		Ignition ON.	0.27 V
Ignition coil cylinder 1 & 4	32		Ignition ON.	briefly 11-14 V then 0 V
Ignition coil cylinder 1 & 4	32		The engine is running		4V/3ms	5
Ignition coil cylinder 2 & 3	1		Ignition ON.	briefly 11-14 V, then 0 V
Ignition coil cylinder 2 & 3	1		The engine is running		4V/3ms	5
Ignition switch	29		Ignition ON.	11-14 V
Electronic immobilizer control unit - some models	58		Ignition ON.		2V/50ms	8
Nozzle 1	59		Ignition ON.	11-14 V
Nozzle 1	59		Idling	3.1 ms	10 V/2 ms	6
Nozzle 2	90		Ignition ON.	11-14 V
Nozzle 2	90		Idling	3.1 ms	10 V/2 ms	6
Nozzle 3	60		Ignition ON.	11-14 V
Nozzle 3	60		Idling	3.1 ms	10 V/2 ms	6
Nozzle 4	89		Ignition ON.	11-14 V
Nozzle 4	89		Idling	3.1 ms	10 V/2 ms	6
Instrument cluster control unit crankshaft speed signal	70		Idling	25 Hz approximately
Instrument cluster control unit crankshaft speed signal	70		3000 rpm	100 Hz approximately
Instrument cluster control unit - fuel consumption signal - some models	11		Idling		4 V/0.2 s	3
Instrument cluster control unit - vehicle speed signal some models	53			¦
Intake Air Temperature Sensor	49		Ignition ON, air temperature 10°C approx	2.4 V
Intake Air Temperature Sensor	77		Ignition ON.	0 B
Knock sensor	20		Idle - short-term acceleration		0.1 V/0.5 ms	7
Knock sensor	79		Ignition ON.	0B
Knock sensor shielded wire	19		Ignition ON.	0B
Manifold Absolute Pressure Sensor	15		Ignition ON.	0 B
	16		Ignition ON.	4.8 V
	16		Idling	1.6 V
	16		Idle - short-term acceleration	4.8 V
	78		Ignition ON.	5 V

Components/Chains	Block output	Signal	Conditions for conducting the inspection	Nominal value	Oscilloscope settings¹	Signal form
Malfunction Indicator Light (MIL) - Some Models	34		Ignition ON - indicator lights up	0 B
Malfunction Indicator Light (MIL) - Some Models	34		The engine is running, the indicator is not on	1-14 V
Multifunctional control unit some models	58		Ignition ON.		2V/50ms	8
Multifunctional control unit some models	88			¦
Multifunctional control unit some models	58			¦
Power Steering Pressure Switch - Some Models	85		The engine is running, the steering wheel is motionless	11-14 V
Power Steering Pressure Switch - Some Models	85		The engine is running, the steering wheel is turning	0 B
Throttle position sensor	43		Ignition ON, throttle closed	0.5 V
	43		Ignition ON, throttle fully open	4.5 V
	74		Ignition ON.	5 V
	75		Ignition ON.	0 B
Electronic control unit of automatic transmission	27			¦
Electronic control unit of automatic transmission	57			¦