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LOCATION:    9.2 ME - SFI (ME2.1)   >  23 Electrical Test Program - Sequential Multiport Fuel Injection System Test


Electrical Test Program - Sequential Multiport Fuel Injection System Test

Test scope Test connection Test condition Nominal value Possible cause/remedy
1.0 P 0 5 6 0 Engine control module
(ME-SFI) (N3/10)
Voltage supply
Circuit 30


3
(3A)
N3/10



12
(4B)
Ignition: ON
11 - 14 V
1.1 - 1.2


1.1   Ground wire

3
(3A)

7
(7A)

112
(8F)

119
(15F)
N3/10











X11/4
2

X11/4
2

X11/4
2

X11/4
2
Ignition: ON 11 - 14 V Wiring,
Model 170 and 202:
Output ground (W16/6), right component compartment.

1.2   Voltage supply
Circuit 30

X11/4
1
N3/10



12
(4B)
Ignition: ON 11 - 14 V Wiring,
Model 170:
Relay module (K40).
Model 202:
Passenger-side fuse and relay module box (K40/4).
2.0 P 0 5 6 0
Engine control module
(ME-SFI) (N3/10)
Voltage supply
Circuit 87


8
(8a)
N3/10



2
(2A)
Ignition: ON 11 - 14 V 2.1 - 2.2
2.1   Electronics ground

8
(8a)
N3/10


X11/4
2
Ignition: ON 11 - 14 V Wiring,
Model 170 and 202:
Output ground (W16/6), right component compartment.
2.2   Voltage supply
Circuit 87

X11/4
1
N3/10



2
(2A)
Ignition: ON

Ignition: OFF
11 - 14 V

< 1 V
Wiring,
Model 170:
Relay module (K40).
Model 202:
Passenger-side fuse and relay module box (K40/4).
3.0 P 1 1 8 2 Starter lock-out relay module (N65k2) or K40k2
Model 170, 202 as of 06/97

Activation



35
(3D)

N3/10




2
(2A)
Engine coolant
temperature >20°C
Ignition/starter switch:
Turn to starter contact briefly.
11 - 14 V
or if engine does not start, for approx. 5 seconds
3.1
Engine control module (N3/10)
3.1   Starter signal
Circuit 50


8
(8a)
N3/10



32
(40C)
Motor: Start


11 - 14 V,
while cranking.
Wiring,
Ignition switch.
4.0 P 0 1 0 0 Hot film MAF
sensor (B2/5)
Hot film signal


104
(48E)
N3/10



103
(47E)
Ignition: ON
Engine: at Idle

Engine coolant
temperature >70°C
0.9 - 1.1 V
1.3 - 1.7 V
Increasing rpm = increasing voltage.
Wiring,
4.1 - 4.3
Air intake system leak,
B2/5.
4.1   Hot film MAF sensor (B2/5)
Voltage supply 5 V
N3/10

104
(48E)



B2/5
4

Disconnect MAF sensor (B2/5) connector and measure directly on socket 4 (br/yl).
Ignition: ON
4.7 - 5.2 V Wiring,
N3/10
4.2   Ground wire for hot film MAF sensor (B2/5)
B2/5
3


N3/10

102
(46E)
Disconnect MAF sensor (B2/5) connector and measure directly on socket 3 (br).
Ignition: ON
4.7 - 5.2 V Wiring.
4.3   Hot film MAF sensor (B2/5)
Voltage supply 12 V
N3/10

104
(48E)



B2/5
2
(2)
Disconnect MAF sensor (B2/5) connector and connect plus of voltmeter to socket 2 (rd/bu).

Ignition: ON
11 - 14 V Wiring,
Model 170:
Relay module (K40)
Model 202:
Passenger-side fuse and relay module box (K40/4).
5.0 P 0 1 1 0 IAT sensor in hot film MAF sensor (B2/5)
Voltage


104
(48E)
N3/10



101
(45E)
Ignition: ON oC V
10 3.1
20 2.7
30 2.2
40 1.8
50 1.4
60 1.1
± 5%
5.1
N3/10
5.1   IAT sensor
Resistance


104
(48E)
N3/10



101
(45E)
Ignition: OFF
Disconnect connector E
on engine control
module (N3/10).
oC
10 3600
20 2420
30 1660
40 1170
50 850
60 600
± 5%
Wiring,
B2/5
6.0 P 0 1 0 5 Pressure sensor (B28)
Sensor signal
(only )


80
(24E)
N3/10



79
(23E)
Connect vacuum tester to pressure sensor (B28) using Y-fitting (Figure 1).
Ignition: ON

Engine: at Idle



> 3.5 V

< 2 V and vacuum climbs to > 500 mbar.


6.1 ,
Vacuum line,
Wiring,
B28
6.1   Pressure sensor (B28)
Voltage supply
(only )


80
(24E)
N3/10



78
(22E)
Ignition: ON
4.7 - 5.3 V N3/10
7.0   FP relay module
Model 170
in relay module (K40)

Model 202:
Passenger-side fuse and relay module (K40/4)
Activation
















Current draw
K40 or K40/4









21
(29C)













8
(8a)







N3/10














N3/10










2
(2A)













21
(29C)

On Model 202 the activation of the fuel pump takes place via the passenger-side fuse and relay module box (K40/4).

Ignition: ON

The activation of the FP occurs only once after ignition "ON". For the next activation, the engine must have run briefly.

Engine: Start





Ignition: ON








11 - 14 V for approx.
1 sec.







11 - 14 V during cranking and while engine runs.

0.1 - 0.3 A
Fuse,
Wiring,
K40,
K40/4,
N3/10
8.0 P 0 1 1 5 ECT sensor (B11/4)
Voltage


84
(28E)
N3/10



85
(29E)
Ignition: ON °C V
20 3.4
30 2.9
40 2.4
50 1.9
60 1.5
70 1.2
80 0.9
90 0.7
100 0.5
±5 %
8.1 ,
N3/10
8.1   Resistance (B11/4)

84
(28E)
N3/10



85
(29E)
Ignition: OFF
Disconnect connector E
on engine control
module (N3/10).
°C
20 3090
30 2000
40 1330
50 900
60 630
70 440
80 320
90 230
100 170
±5 %
Wiring,
8.2
8.2   ECT sensor (B11/4)
Resistance

1
B11/4


2
Disconnect connector on ECT sensor (B11/4). °C
20 3090
30 2000
40 1330
50 900
60 630
70 440
80 320
90 230
100 170
±5 %
B11/4

9.0   Engine control module (N3/10)
TN-signal output


8
(8a)



8
(8a)
N3/10




N3/10



30
(38C)



30
(38C)
Test with oscilloscope.
Engine: Start or
Engine: at Idle



Test with multimeter only if oscilloscope is not available.
Signal, see
Figure 2.





7.5 - 9.0 V
Wiring,
N3/10
10.0 P 0 1 3 0
P 0 1 3 3
O2S 1
(before TWC) (G3/2)
O2S signal


23
(31C)
N3/10



24
(32C)
If ECT > 80 ° C, run engine at idle for at least two minutes.
fluctuates from
- 0.2 V to + 1.0 V, by more than
0.3 V
Wiring,
11.0
G3/2
11.0 P 0 1 3 5 O2S 1
(before TWC) (G3/2)
O2S heater activation


5
(5A)
N3/10



2
(2A)
If ECT > 80 ° C, run engine at idle for at least two minutes. 11 - 14 V Wiring,
G3/2
N3/10
    O2S 1 (G3/2)
Current draw


3
(3A)
N3/10



5
(5A)
Ignition: ON 0.6 - 3.4 A  
12.0 P 0 1 3 6
O2S 2
(after TWC) (G3/1)
O2S signal
(only )


39
(7D)





3
(3A)

3
(3A)
N3/10






N3/10






40
(8D)





20
(28c)

66
(10e)
If ECT > 80° C,
Engine: Start
Raise and hold engine speed at 2000 - 3000 rpm for approx. 2 minutes.
Engine at idle:


Bridge sockets on socket box.

Within one minute, the value range of 450 mV to 500 mV must be either exceed or be below value range given.




AIR pump runs.
Voltage changes to < 40 mV within 60 seconds.
Wiring,
13.0 ,
G3/1,
N3/10
13.0 P 0 1 4 1
O2S 2
(after TWC) (G3/1)
O2S heater activation
(only )


9
(1b)
N3/10



2
(2A)
Engine: at Idle
If ECT > 80° C, run engine at idle for at least 2 minutes.
11 - 14 V
or voltage fluctuates between
1 - 14 V
Wiring,
G3/1,
N3/10
    O2S 2 (G3/1)
Current draw


3
(3A)
N3/10



9
(1b)
Ignition: ON 0.6 - 3.4 A  
14.0 P 0 2 0 1 Injector (Y62y1)
Activation and injection time

81
(25e)
N3/10


2
(2A)
ECT approx. 20° C
at start:

ECT approx. 80° C
at idle:

accelerate briefly:
Injection time:
approx. 8 ms


approx. 2.7 -
4 ms
approx. 14 ms
(signal see Figures 3 and 4).
Fuse,
Wiring,
Y62y1,
N3/10,
ECT sensor (B11/4),
IAT sensor in hot film MAF
sensor (B2/5),
O2S 1 (G3/2).
    Resistance (Y62y1)

81
(25e)
N3/10



2
(2A)
Ignition: OFF
14 - 17
 
15.0 P 0 2 0 2 Injector (Y62y2)
Activation and injection time


70
(14e)
N3/10



2
(2A)
ECT approx. 20° C
at start:

ECT approx. 80° C
at idle:

accelerate briefly:
Injection time:
approx. 8 ms


approx. 2.7 -
4 ms
approx. 14 ms
(signal see Figures 3 and 4).
Fuse,
Wiring,
Y62y2,
N3/10,
ECT sensor (B11/4),
IAT sensor in hot film MAF
sensor (B2/5),
O2S 1 (G3/2).
    Resistance (Y62y2)

70
(14e)
N3/10



2
(2A)
Ignition: OFF
14 - 17
 
16.0 P 0 2 0 3 Injector (Y62y3)
Activation and injection time


82
(26e)
N3/10



2
(2A)
ECT approx. 20° C
at start:

ECT approx. 80° C
at idle:

accelerate briefly:
Injection time:
approx. 8 ms


approx. 2.7 -
4 ms
approx. 14 ms
(signal see Figures 3 and 4).
Fuse,
Wiring,
Y62y3,
N3/10,
ECT sensor (B11/4),
IAT sensor in hot film MAF
sensor (B2/5),
O2S 1 (G3/2).

    Resistance (Y62y3)

82
(26e)
N3/10



2
(2A)
Ignition: OFF
14 - 17
 
17.0 P 0 2 0 4 Injector (Y62y4)
Activation and injection time


69
(13e)
N3/10



2
(2A)
ECT approx. 20° C
at start:

ECT approx. 80° C
at idle:

accelerate briefly:
Injection time:
approx. 8 ms


approx. 2.7 -
4 ms
approx. 14 ms
(signal see Figures 3 and 4).
Wiring,
Y62y4,
N3/10,
ECT sensor (B11/4),
IAT sensor in hot film MAF
sensor (B2/5),
O2S 1 (G3/2).
    Resistance (Y62y4)

69
(13e)
N3/10



2
(2A)
Ignition: OFF
14 - 17
 
18.0 P 0 4 1 0
P 1 4 5 3
AIR pump relay in passenger-side fuse and relay module box (K40/4),
Model 202, without supercharger
(only )
Activation



20
(28c)
N3/10





2
(2A)
Disconnect ECT sensor (B11/4) connector. Simulate 2.5 k resistance at sockets 1 and 4 with resistance substitution unit.
Engine: at Idle
11 - 14 V
for approx. two minutes and AIR pump runs.
Wiring,
AIR pump fuse,
K40/4,
N3/10
    Current draw (K40/4)

3
(3A)
N3/10





20
(28c)
Ignition: ON 0.1 - 0.3 A  
19.0 P 0 4 1 0
P 1 4 2 0
AIR pump switchover valve (Y32)
(only )
Activation


66
(10e)
N3/10




2
(2A)
Disconnect ECT sensor (B11/4) connector. Simulate 2.5 k resistance at sockets 1 and 4 with resistance substitution unit.
Engine: at Idle
11 - 14 V
for approx. two minutes and AIR pump runs.
Fuse,
Wiring,
Y32,
N3/10
    Current draw (Y32)

3
(3A)
N3/10




66
(10e)
Ignition: ON 0.4 - 0.6 A  
20.0 P 0 4 1 0 AIR system
(logic chain)
(only )

The O2S 1 signal before TWC is being measured.


23
(31C)



Super-
charger
3
(3A)
3
(3A)

Normally
aspirat-ed eng.
3
(3A)
3
(3A)
N3/10






N3/10













24
(32C)





125
(21f)
66
(10e)




20
(28c)
66
(10e)
If ETC > 80oC, run engine at idle for at least 2 minutes.






Bridge sockets on socket box.
The O2S voltage oscillates in the area of -0.2 V and +1.0 V




AIR pump or supercharger runs.
Voltage changes to < 100 mV within 20 seconds.
Y32 binding,
AIR combi valve,
AIR pump or supercharger no output.
21.0 P 1 4 0 0 EGR switchover valve (Y27)
Model 202, without supercharger, engine 111.974
Activation


61
(5E)
N3/10



2
(2A)
Engine: at Idle
ECT > 60 oC

Accelerate briefly



11 - 14 V
Wiring,
Y27,
N3/10,
22.0 - 23.0
    Y27
Current draw


3
(3A)
N3/10



61
(5E)
Ignition: ON 0.3 - 0.5 A  
22.0 P 0 4 0 0 EGR switchover valve (Y27)
Model 202, without supercharger, engine 111.974
Vacuum control


 


 

Test connection:
Connect vacuum tester to EGR valve.

Engine: Start
and run at > 3000 rpm






> 400 mbar
Vacuum line,
EGR valve,
Y27
23.0 P 0 4 0 0 EGR switchover valve (Y27)
Model 202, without supercharger, engine 111.974
Mechanical test


 


 

Test connection:
engine: at Idle
Apply 500 mbar vacuum to EGR valve.

Engine: OFF
Apply 500 mbar vacuum to EGR valve and pull off vacuum hose.



Engine runs uneven.


EGR valve closes audibly.
EGR valve
24.0 P 1 5 2 5 Adjustable camshaft timing solenoid (Y49)

Current draw

1
Y49


2
Test connection note:
Connect test cable
(102 589 04 63 00) to solenoid.

Engine: at idle
ECT > 70oC
Increase engine speed to approx. 2000 rpm.






1.0 - 1.5 A
24.1 ,
25.0 ,
N3/10
24.1   Resistance Y49

60
(4e)
N3/10




2
(2A)
Ignition: OFF 7 - 12 Wiring,
Y49
25.0 P 1 5 1 9 Adjustable camshaft timing solenoid (Y49)
Mechanical function


60
(4e)
N3/10




3
(3A)
Engine: at Idle

Bridge sockets on socket box for a maximum of 10 seconds.
Engine runs rough or stalls Check function of camshaft adjuster (see SMS, Engine 104, Job No. 05-2160).
26.0 P 0 4 4 0
P 0 4 4 1
P 0 4 4 3
Purge control
valve (Y58/1)
Activation


13
(21b)
N3/10



2
(2A)
Engine: at Idle
and at operating temperature.
After approx. 1 minute, purge control valve (Y58/1) must noticeably cycle (Fig. 5 to 6) Signal see Figure 7.
Fuse,
Wiring,
Y58/1,
27.0 ,
N3/10
    Current draw (Y58/1)

3
(3A)
N3/10



13
(21b)
Ignition: ON 0.3 - 0.5 A  
27.0 P 0 4 4 0
P 0 4 4 1
Purge control
valve (Y58/1)
Vacuum control
 
Connect vacuum tester to purge control valve (Y58/1) between purge line to charcoal canister (Figure 5 to 6).

Engine at operating temperature and at idle.
After approx. 1 minute,
> 50 mbar and needle oscillates,
Y58/1 must cycle.
Vacuum line,
Y58/1
28.0 P 0 4 4 0
P 0 4 4 2
P 0 4 4 6
P 0 4 5 5
Purge system
System leaks
Model 170 (only )
Model 202 (only ) as of 09/97
Activated charcoal canister shut-off valve (Y58/4) Activate




3
(3A)


N3/10






34
(2d)
Disconnect purge line to charcoal canister on purge control valve (Y58/1). Connect vacuum tester to purge line (Figure 5 and 6).

Ignition: ON

Apply approx. 25 mbar of vacuum.









After approx. 1 minute,
< 5 mbar vacuum loss.
Fuel tank cap,
Purge line to charcoal canister,
Purge line from charcoal canister to Y58/4,
Charcoal canister,
Y58/4,
Y58/1,
Fuel tank pressure sensor (B4/3).

Charcoal canister,
Y58/4,
Purge control valve (Y58/1).
29.0 P 0 4 4 6 Activated charcoal canister shut-off valve (Y58/4)
Model 170 (only )
Model 202 (only ) as of 09/97
Current draw


3
(3A)
N3/10




34
(2d)
Ignition: ON 0.5 - 0.9 A Fuse,
Wiring,
Y58/4
30.0 P 0 4 4 6
P 0 4 5 0
P 0 4 5 5
Fuel tank pressure
sensor (B4/3)
Model 170 (only )
Model 202 (only ) as of 09/97
Sender signal

Activated charcoal canister shut-off valve (Y58/4) Activate


36
(4d)



3
(3A)
N3/10




N3/10




37
(5d)



34
(2d)
Disconnect purge line to
charcoal canister on
purge control valve
(Y58/1). Connect
vacuum tester to purge
line (Figure 5 and 6).

Ignition: ON


Apply approx. 25 mbar of vacuum.







> 2.3 V


< 2.3 V
30.1 ,
Wiring,
Vacuum line,
Charcoal canister clogged,
B4/3
30.1   Fuel tank pressure
sensor (B4/3)
(only )
Voltage supply


36
(4d)
N3/10




38
(6d)
Ignition: ON 4.7 - 5.3 V N3/10
31.0 P 0 4 5 0
Purge monitoring pressure
sensor (B4/4)
Model 202 (only )
up to 08/97
Sender signal



36
(4d)
N3/10




37
(5d)
Disconnect vacuum line
at purge monitoring
pressure sensor (B4/4).
Connect vacuum tester
to purge monitoring
pressure sensor
(Figure 8).

Ignition: ON


Apply approx. 300 mbar of vacuum.








> 3.5 V


< 3 V
31.1 ,
Wiring,
B4/4
31.1   Purge monitoring pressure sensor (B4/4)
Voltage supply


36
(4d)
N3/10




38
(6d)
Ignition: ON 4.7 - 5.3 V N3/10
32.0 P 0 6 0 0
P 0 8 1 1
P 1 5 7 0
P 1 6 0 3
P 1 7 4 7
CAN data bus


43
(11d)
N3/10

44
(12d)
Ignition: OFF


55 - 65 32.1 - 32.2
Data line.
32.1   CAN element in:
Electronic ignition lock control module (N73)
or
DAS control module (N54/1)
Resistance


43
(11d)
N3/10




44
(12d)
Ignition: OFF
Disconnect connector D from engine control module (N3/10).

115 - 125 Wiring,
Vehicles without EIS:
DAS control module (N54/1).
Vehicles with EIS:
Electronic ignition lock control module (N73).
32.2   CAN element in:
Engine control module (N3/10)
Resistance


43
(11d)
N3/10




44
(12d)
Ignition: OFF
Disconnect connector D from test cable.

115 - 125 N3/10
33.0 P 1 1 6 3 Oil level switch (S43)

73
(17E)
N3/10



2
(2A)
Ignition: ON

Oil level okay.
Oil level low.


11 - 14 V
< 1 V
Wiring,
S43
34.0   Diagnosis line
Activation


3
(3A)
N3/10



31
(39C)
Ignition: ON


11 - 14 V Wiring,
N3/10
35.0 P 0 8 0 5
P 1 2 3 5
Supercharger function  
Connect pressure tester to intake manifold.
Drive vehicle on dynometer or road in transm. selector lever in range 3 or 3rd gear if manual trans. with full load at approx. 3500 rpm.
> 280 mbar pressure 36.0 - 37.0
Air flap/air filter actuator (M16/7) binding,
Charge air line plugged,
Supercharger defective.
36.0 P 0 8 0 6
P 1 2 3 6
Magnetic supercharger clutch (Y2/1)
Activation

Supercharger only



Magnetic supercharger clutch (Y2/1)
Current draw


125
(21f)





3
(3A)
N3/10






N3/10




2
(2A)





125
(21f)
Engine: At Idle;
Rapidly depress accelerator pedal
(WOT):





Ignition: ON



11 - 14 V,
as long as the supercharger is engaged.


2.6 - 4.5 A
Wiring,
Y2/1,
N3/10
37.0 P 0 8 0 3
P 0 2 4 3
Air flap/air filter actuator (M16/7)
Activation

Supercharger only


59
(3e)
N3/10



3
(3A)
Ignition: ON
Engine: At Idle;
Rapidly depress accelerator pedal
(WOT):
1.0 - 1.4 V



2.0 - 12.0 V
Wiring,
M16/7,
N3/10
38.0 P 0 8 0 1
P 1 1 8 1
Engine/climate control electric cooling fan control module (N76)

Activation


3
(3A)
N3/10



6
(6a)
Engine: at Idle
ECT < 70 oC

A/C system: ON


ECT > 85 oC
1 - 1.9 V and fan is stopped.

2 - 6 V and
fan runs.

Between
2.5 - 12.5 V and fan runs according to activation.
Wiring,
N76,
N3/10
39.0 P 1 5 5 1 A/C System:
A/C compresser shutoff
Activation
With Tempmatic A/C (only )



8
(8a)
N3/10



59
(3e)
Engine: At Idle;
Rapidly depress accelerator pedal
(WOT):
(>2,000 rpm)



11 - 14 V,
as long as the A/C compresser is disengaged.
Wiring,
Wrong A/C control module installed for A/C system.
N3/10
40.0   Model 170 (only )
with manual transmission

Clutch pedal engage/release
switch (S40/5)


3
(3A)
N3/10



32
(40C)
Starter: Engage
Press clutch pedal:



Release clutch pedal:


11 - 14 V, and
starter motor rotates.

< 1.0 V, and
starter motor stops (does not rotate).
Wiring,
S40/5
41.0 P 1 6 8 1
Vehicles as of 06/98:
Crash signal



8
(8a)
N3/10



48
(16D)
Ignition: ON

< 1.0 V
Wiring,
Readout DTC memory for SRS
1) Observe Preparation for Test, see 22 .