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LOCATION:    9.3 ME - SFI (ME2.0)   >  23 Electrical Test Program - Sequential Multiport Fuel Injection System Test


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 U


3
(3A)
N3/10



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


1.1   Ground wire,
Output ground
N3/10

3
(3A)

7
(7A)

112
(8f)

119
(15f)











X11/4
2

X11/4
2

X11/4
2

X11/4
2
Ignition: ON 11 - 14 V Wiring,
Models 202, 208, 210:
Output ground (W16/6), right component compartment.
Model 163:
Ground (W16), component compartment.
1.2
1.2   Voltage supply
Circuit 30

X11/4
1
N3/10



12
(4b)
Ignition: ON 11 - 14 V Wiring,
Passenger-side fuse and relay module (K40/4).
or
Fuse and relay box (F1).
2.0 P 0 5 6 0
Engine control module
(ME-SFI) (N3/10)
Voltage supply
Circuit 87 U


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,
Models 202, 208, 210
Output ground (W16/6), right component compartment.
Model 163:
Ground (W16), component compartment.
2.2   Voltage supply
Circuit 87

X11/4
1
N3/10



12
(2A)
Ignition: ON
Model 163:
Connect socket 4 to 16-pole test connector

Ignition: OFF
11 - 14 V





< 1 V
Wiring,
Passenger-side fuse and relay module (K40/4).
or
Fuse and relay box (F1).
3.0   Starter relay
Models 202, 208, 210:
(K40/4k2) in passenger-side fuse and relay module box (K40/4)
Model 163:
(F1k8) in fuse and relay box
Activation


35
(3d)
N3/10



2
(2A)
ECT temperature
> 20 ° C
Vehicle with AT
Ignition/starter switch (S2/1): position 3
(start position): crank engine briefly








11 - 14 V
or if engine does not start in approx. 5 seconds.
3.1 ,
Engine control module (N3/10)
3.1   Starter signal circuit 50

8
(8A)
N3/10



32
(40C)
Engine: Start 11 - 14 V
while starting.
Wiring,
Ignition/starter switch (S2/1)
4.0 P 0 1 0 0 Hot film MAF
sensor (B2/5)
Hot film signal


104
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.
4.1 - 4.3 ,
Wiring,
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 (brown/yellow).
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 (brown).
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 (red/blue).

Ignition: ON
11 - 14 V Wiring,
Passenger-side fuse and relay module (K40/4).
or
Fuse and relay box (F1f11).
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 °C V 5.1
N3/10
10 3.1
20 2.7
30 2.2
40 1.8
50 1.4
60 1.1
± 5%
5.1   IAT sensor
Resistance


104
(48E)
N3/10




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


80
(24e)
N3/10




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

Engine: at Idle






> 3.5 V

< 2 V and vacuum climbs to > 500 mbar.
Vacuum line,
Wiring,
B28,
N3/10
    Pressure sensor (B28)
Voltage supply


80
(24e)
N3/10




78
(22E)
Ignition: ON
4.7 - 5.3 V  
7.0   FP relay module
Models 202/208/210: (K27)
Model 163:
(F1k3) in fuse and relay
box
Activation







Current draw (K27) or (F1k3)


21
(29c)









8
(8A)
N3/10










N3/10




2
(2A)









21
(29c)
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
Fuses,
Wiring,
K27 or F1k3,
N3/10
8.0 P 0 1 1 5 ECT sensor (B11/4)
Voltage


84
(28e)
N3/10




85
(29e)
Ignition: ON °C
V 8.1 ,
N3/10
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   Resistance (B11/4)

84
(28e)
N3/10




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

1
B11/4


2
Disconnect connector on ECT sensor (B11/4). °C
B11/4

20 3090
30 2000
40 1330
50 900
60 630
70 440
80 320
90 230
100 170
±5 %
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 5 0
P 0 1 5 3
P 0 1 6 0
Left O2S 1
(before TWC) (G3/3)
O2S signal

26
(34c)
N3/10



25
(33c)
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
12.0 ,
Wiring,
G3/3
11.0 P 0 1 3 0
P 0 1 3 3
P 0 1 4 0
Right O2S 1
(before TWC) (G3/4)
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
13.0 ,
Wiring,
G3/4
12.0 P 0 1 5 5

Left O2S 1
(before TWC) (G3/3)
O2S heater
Activation


1
(1a)
N3/10



2
(2A)
If ECT > 80° C, run engine at idle for at least 2 minutes.

11 - 14 V
Fuses,
Wiring,
G3/3,
N3/10
    O2S 1 (G3/3)
Current draw


3
(3A)
N3/10



1
(1a)
Disconnect connector A on engine control
module N3/10

Ignition: ON





1.0 - 4.5 A
 
13.0 P 0 1 3 5

Right O2S 1
(after TWC) (G3/4)
O2S heater
Activation


5
(5a)
N3/10



2
(2A)
If ECT > 80° C, run engine at idle for at least 2 minutes.

11 - 14 V
Fuses,
Wiring,
G3/4,
N3/10
    O2S 2 (G3/4)
Current draw


3
(3A)
N3/10



5
(5a)
Disconnect connector A on engine control
module N3/10

Ignition: ON





1.0 - 4.5 A
 
14.0 P 0 1 5 6
P 0 1 6 0
Only
Left O2S 2
(after TWC) (G3/5)
O2S signal


42
(10d)
N3/10



41
(9d)
If ECT > 80° C, run engine at 2000-3000 rpm for approx. 2 minutes.

The mV range of 450 - 500 mV must be exceeded or not attained within 1 minute.
16.0 ,
Wiring,
G3/5,
N3/10
     

3
(3A)

3
(3A)
N3/10






66
(10e)

20
(28c)
Engine: at Idle

Bridge sockets on socket box.


Air pump runs.
Voltage changes within 60 seconds to
< 40 mV
 
15.0 P 0 1 3 6
Only
Right O2S 2
(after TWC) (G3/6)
O2S signal


39
(7d)
N3/10



40
(8d)
If ECT > 80° C, run engine at 2000-3000 rpm for approx. 2 minutes.

The mV range of 450 - 500 mV must be exceeded or not attained within 1 minute. 17.0 ,
Wiring,
G3/6,
N3/10
     

3
(3A)

3
(3A)
N3/10






60
(10e)

20
(28c)
Engine: at Idle

Bridge sockets on socket box.


Air pump runs.
Voltage changes within 60 seconds to
< 40 mV
 
16.0 P 0 1 6 1

Only
Left O2S 2
(after TWC) (G3/5)
O2S heater
Activation


10
(2b)
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 11 - 14 V.
Fuses,
Wiring,
G3/5,
N3/10
    O2S 2 (G3/5)
Current draw


3
(3A)
N3/10



10
(2b)
Disconnect connector B on engine control module N3/10

Ignition: ON





1.0 - 4.5 A
 
17.0 P 0 1 4 1

Only
Right O2S 2
(after TWC) (G3/6)
O2S heater
Activation


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 11 - 14 V.
Fuses,
Wiring,
G3/6,
N3/10
    O2S 2 (G3/6)
Current draw


3
(3A)
N3/10



9
(1b)
Disconnect connector B on engine control module


Ignition: ON






1.0 - 4.5 A
 
18.0 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. 3 - 5 ms
approx. 14 ms

(signal: see Figures 3 and 4)
Fuses,
Wiring,
Y62y1,
N3/10,

Further possibilities:
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor (B2/5),
O2S 1 (G3/3 or G3/4).
    Resistance (Y62y1)

81
(25e)
N3/10



2
(2A)

Ignition: OFF
14 - 18
 
19.0 P 0 2 0 2 Injector (Y62y2)
Activation and injection time


57
(1e)
N3/10



2
(2A)
ECT approx. 20° C
at start:

ECT approx. 80° C
at idle:
accelerate briefly:
Injection time:
approx. 8 ms


approx. 3 - 5 ms
approx. 14 ms
(signal: see Figures 3 and 4)
Fuses,
Wiring,
Y62y2,
N3/10,

Further possibilities:
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor (B2/5),
O2S 1 (G3/3 or G3/4).
    Resistance (Y62y2)

57
(1e)
N3/10




2
(2A)
Ignition: OFF
14 - 18
 
20.0 P 0 2 0 3 Injector (Y62y3)
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. 3 - 5 ms
approx. 14 ms
(signal: see Figures 3 and 4)
Fuses,
Wiring,
Y62y3,
N3/10

Further possibilities:
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor (B2/5),
O2S 1 (G3/3 or G3/4).
    Resistance (Y62y3)

69
(13e)
N3/10




2
(2A)
Ignition: OFF
14 - 18
 
21.0 P 0 2 0 4 Injector (Y62y4)
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. 3 - 5 ms
approx. 14 ms
(signal: see Figures 3 and 4)
Fuses,
Wiring,
Y62y4,
N3/10

Further possibilities:
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor (B2/5),
O2S 1 (G3/3 or G3/4).
    Resistance (Y62y4)

82
(26e)
N3/10




2
(2A)
Ignition: OFF
14 - 18
 
22.0 P 0 2 0 5 Injector (Y62y5)
Activation and injection time


58
(2e)
N3/10




2
(2A)
ECT approx. 20° C
at start:

ECT approx. 80° C
at idle:
accelerate briefly:
Injection time:
approx. 8 ms


approx. 3 - 5 ms
approx. 14 ms
(signal see Figures 3 and 4)
Fuses,
Wiring,
Y62y5,
N3/10

Further possibilities:
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor (B2/5),
O2S 1 (G3/3 or G3/4).
    Resistance (Y62y5)

58
(26e)
N3/10




2
(2A)
Ignition: OFF
14 - 18
 
23.0 P 0 2 0 6 Injector (Y62y6)
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. 3 - 5 ms
approx. 14 ms
(signal: see Figures 3 and 4)
Fuses,
Wiring,
Y62y6,
N3/10

Further possibilities:
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor (B2/5),
O2S 1 (G3/3 or G3/4).
    Resistance (Y62y6)

70
(14e)
N3/10




2
(2A)
Ignition: OFF
14 - 18
 
24.0 P 1 4 5 3 Only
AIR relay module
Models 202/208/210: (K17),
in Passenger-side fuse and relay module
box (K40/4)
Model 163: in fuse and relay box (F1k28)
Activation


20
(28c)
N3/10






2
(2A)
Disconnect ECT sensor (B11/4) connector. Simulate 2.5 k resistance at sockets 1 and 2 with resistance substitution unit.
Engine: at Idle
11 - 14 V
for approx. two minutes and AIR pump runs.
Fuses,
Wiring,
K40/4 or F1k28,
N3/10
    Current draw (K40/4) or (F1k28)

3
(3A)
N3/10





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


66
(10e)
N3/10





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

3
(3A)
N3/10





66
(10e)
Ignition: ON 0.3 - 0.5 A  
26.0 P 0 4 1 0 Only
AIR system
(logic chain)


23
(31c)







3
(3A)

3
(3A)
N3/10








N3/10







24
(32c)






66
(10e)

20
(28c)
Note:
The O2S 1 signal before TWC is measured.

If ETC > 80°C 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 runs.
Voltage changes to < 100 mV within 20 seconds
Y32,
AIR combi valve,
AIR pump no output.
27.0 P 0 4 0 0
P 1 4 0 0
EGR valve vacuum
transducer (Y31/1)
Activation and vacuum
control
















Current draw (Y31/1)


61
(5e)
















3
(3A)
N3/10

















N3/10




2
(2A)
















61
(5e)
Note regarding test:
This test is not possible
on Models 163 and 210
4MATIC
Note to test
connection:
Connect vacuum tester
to EGR valve vacuum
transducer, after
removing the MAF
sensor with air box.

Engine: at idle
ETC > 60°C


Vehicle at approx.
3000/rpm while on
dynamometer

Ignition: ON




















< 1 V and
< 10 mbar
vacuum.

1 - 7 V and
80 - 220 mbar
vacuum.



0.3 - 0.5 A
Fuses,
Wiring,
N3/10,
Y31/1
28.0 P 0 8 0 2
P 1 2 2 5
Resonance intake manifold switchover valve (Y22/6)
Activation


68
(12e)
N3/10




2
(2A)
Engine: Start
Engine: at idle

Engine: accelerate briefly to > approx. 3900 rpm

< 1 V


9 - 14 V and
vacuum applied
to valve.
Fuses,
Wiring,
Y22/6,
N3/10
    Current draw (Y22/6)

3
(3A)
N3/10




68
(12e)
Ignition: ON 0.3 - 0.5 A  
29.0 P 0 4 4 1
P 0 4 4 3
Purge control
valve (Y58/1)
Activation


13
(21c)
N3/10




2
(2A)
Engine: at Idle
and at operating temperature.
After approx.
2 minutes, purge
control valve
(Y58/1) must
noticeably
cycle, Signal:
see Figure 5.
30.0 ,
Fuses,
Wiring,
Y58/1,
N3/10
   

Current draw (Y58/1)


3
(3A)
N3/10




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

Engine at operating temperature and at idle.
After approx. 2
minute,
> 50 mbar and
needle
oscillates,
Y58/1 must
cycle.
Vacuum lines,
Y58/1
31.0 P 0 4 4 0
P 0 4 4 2
P 0 4 4 6
P 0 4 5 5
Only
Purge system
Leaks


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







3
(3A)





N3/10









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

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,
Y58/1,
Y58/4,
B4/3
32.0 P 0 4 4 6 Only
Activated charcoal canister shut-off valve (Y58/4)
Current draw


3
(3A)
N3/10




34
(2d)
Ignition: ON 0.5 - 0.9 A Fuses,
Wiring,
Y58/4
33.0 P 0 4 4 6
P 0 4 5 0
P 0 4 5 5
Only
Fuel tank pressure
sensor (B4/3)
Sender signal

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


36
(4d)



3
(3A)
N3/10




N3/10




37
(5d)



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

Ignition: ON


Apply approx. 25 mbar of
vacuum.












> 2.9 V


< 2.3 V
33.1 ,
Wiring,
Vacuum line,
Charcoal canister clogged,
B4/3
33.1   Only
Fuel tank pressure
sensor (B4/3)
Voltage supply


36
(4d)
N3/10




38
(6d)
Ignition: ON 4.7 - 5.3 V N3/10
34.0 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 34.1 - 34.2
Data line.
34.1   CAN element in electronic ignition lock control module (N73) or
DAS radio frequency/infrared control module (N54/1) or
Instrument cluster (A1)
Resistance


43
(11d)
N3/10




44
(12d)
Ignition: OFF
Disconnect connector D from engine control module N3/10.
115 - 125 Wiring,
Model 202, 208, 210:
N73,
Model 163:
A1
34.2   CAN element in engine control module (N3/10)
Resistance


43
(11d)
N3/10




44
(12d)
Ignition: OFF
Disconnect connector D from test cable and reconnect connector D to N3/10
115 - 125 N3/10
35.0 P 1 1 7 7
P 1 1 7 8
P 1 1 7 9
P 1 1 8 0
P 1 1 8 5
Oil sensor (level/ temperature/quality) (B40)

72
(16e)




72
(16e)
N3/10





N3/10


73
(17e)




73
(17e)
Test connection note
regarding oscillascope:
Range: 2V
Duration: 50ms

Test with multimeter only
if oscilloscope is not
available.
Ignition: ON


Signal: see
Figure 6




0.3 - 3 V,
voltage jumps
35.1 ,
oil level,
oil quality,
wiring,
B40
35.1   Voltage supply (B40)

72
(16e)
N3/10



71
(15E)
Ignition: ON


4.7 - 5.3 V N3/10
36.0 P 0 8 0 1
P 1 1 8 1

With engine/climate control electric cooling fan only

Engine/climate control electric cooling fan control module (N76)
Activation


3
(3A)
N3/10





6
(6A)
Engine: at idle
ECT< 70° C
Ignition: ON



A/C: ON



ECT > 85° C


1 - 1.9 V and
cooling fan is
stationary.

2 - 4 V and
cooling fan
runs.

between 2.5 - 12.5 V and cooling fan speed is based on activation.
Wiring,
N76,
N3/10
37.0   Diagnosis line
Activation

3
(3A)
N3/10


31
(39C)
Ignition: ON


11 - 14 V Wiring,
N3/10
38.0 P 1 6 8 1 Vehicles as of 06/98
Crashsignal


8
(8A)
N3/10




48
(16d)
Ignition: ON


< 1 V Wiring,
Readout DTC memory for SRS