STI Home
Diagnostic Manual, Engines, Volume 4

 Printable version
LOCATION:    9.1 ME - SFI (ME2.1)   >  23 Electrical Test Program - Sequential Multiport Fuel Injection System Test for 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 129:
Ground, module box bracket (W27).
Model 140:
Output ground (W15), right footwell.
Model 202, 210:
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 129, 140:
Base moduel (N16/1) or fuse on base module.
Model 202:
Passenger-side fuse and relay module box (K40/4).
Model 210:
Relay module (K40).
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 129:
Control module box bracket (W27).
Model 140:
Output ground (W15), right footwell.
Model 202 and 210:
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 129, 140:
Base module (N16/1) or fuse on base module.
Model 202:
Passenger-side fuse and relay module box (K40/4).
Model 210:
Relay module (K40).
3.0   Starter signal
Circuit 50


8
(8A)
N3/10



32
(40C)
Engine: Start 11 - 14 V
during the start procedure.

Wiring,
Ignition/starter switch
4.0   Starter relay in fuse and relay module box (K40/4)
Model 202.028 with
722.4/.6 A-transm.
Activation


35
(3D)
N3/10



2
(2A)
Selector lever position:
P/N
Engine: Start

Selector lever position:
R, D, 3, 2
Engine: Start


11 - 14 V




< 2 V
4.1
Engine control module (N3/10).
4.1   P/N recognition

51
(19D)
N3/10



2
(2A)
Ignition: ON

Selector lever position:
P/N

R, D, 4, 3, 2, 1,




11 - 14 V

< 2 V
Wiring,
See in WIS:
AD27.19-P-1000AZ,
and AD27.19-P-3000AB
5.0 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.
5.1 - 5.3,
Wiring,
Air intake system leak,
B2/5

5.1   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
5.2   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.
5.3   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 129, 140:
Base module (N16/1) or fuse on base module.
Model 202:
Passenger-side fuse and relay module box (K40/4).
Model 210:
Relay module (K40).
6.0 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 6.1
N3/10
10 3.1
20 2.7
30 2.2
40 1.8
50 1.4
60 1.1
± 5%
6.1   IAT sensor
Resistance

104
(48E)
N3/10


101

(45E)
Ignition: OFF
Disconnect connector E
on engine control
module (N3/10).
oC Wiring,
B2/5
10 3600
20 2420
30 1660
40 1170
50 850
60 600
± 5%
7.0 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,
23 (Figure 1).
Ignition: ON

Engine: at Idle





> 3.5 V

< 2 V and pressure climbs to > 500 mbar.
7.1 ,
Vacuum line,
Wiring,
B28
7.1   Pressure sensor (B28)
Voltage supply


80
(24E)
N3/10



78
(22E)
Ignition: ON
4.7 - 5.3 V N3/10
8.0   Model 129, 140, 202
FP relay module (K27)

Model 210
Relay module (K40)
Activation
















Current draw
K27 or K40








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 starting
and while
engine runs
only.


0.1 - 0.3 A
Wiring,
K27 or K40,
N3/10
9.0 P 0 1 1 5 ECT sensor (B11/4)
Voltage


84
(28E)
N3/10



85
(29E)
Ignition: ON °C V 9.1 ,
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 %
9.1   Resistance (B11/4)

84
(28E)
N3/10



85
(29E)
Ignition: OFF
Disconnect connector E
on engine control
module (N3/10).
°C Wiring,
9.2
20 3090
30 2000
40 1330
50 900
60 630
70 440
80 320
90 230
100 170
±5 %
9.2   ECT sensor (B11/4)
Resistance

1
B11/4


2
Disconnect connector on ECT sensor (B11/4). Nominal value, see 9.1 B11/4

10.0   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 test with oscilloscope is not possible.
Signal, see
Figure 2





7.5 - 9.0 V
Wiring,
N3/10
11.0 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,
12.0 ,
G3/2
12.0 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  
13.0 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.




> 550 mV


AIR pump runs.
Voltage changes
to < 40 mV
within 60
seconds.
Wiring,
14.0 ,
G3/1,
N3/10
14.0 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  
15.0 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).
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
 
16.0 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).
Wiring,
Y62y2,
N3/10,
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor
(B2/5),
O2S 1 (G3/2).
    Resistance (Y62y2)

57
(1E)
N3/10



2
(2A)
Ignition: OFF
14 - 17
 
17.0 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).
Wiring,
Y62y3,
N3/10,
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor
(B2/5),
O2S 1 (G3/2).
    Resistance (Y62y3)

69
(13E)
N3/10



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


58
(2E)
N3/10



2
(2A)
ECT approx. 20° C
at start:

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


approx. 3 - 5 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)

58
(2E)
N3/10



2
(2A)
Ignition: OFF
14 - 17
 
19.0 P 0 2 0 5 Injector (Y62y5)
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).
Wiring,
Y62y5,
N3/10,
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor
(B2/5),
O2S 1 (G3/2).
    Resistance (Y62y5)

82
(26E)
N3/10



2
(2A)
Ignition: OFF
14 - 17
 
20.0 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).
Wiring,
Y62y6,
N3/10,
ECT sensor (B11/4),
IAT sensor in hot film MAF sensor
(B2/5),
O2S 1 (G3/2).
    Resistance (Y62y6)

70
(14E)
N3/10



2
(2A)
Ignition: OFF
14 - 17
 
21.0 P 1 4 5 3 Model 129, 140:
AIR relay module (K17),
Model 202: Passenger-side
fuse and relay module
box (K40/4),
Model 210:
Relay module (K40)
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.
Wiring,
AIR pump fuse,
K17, K40 or K40/4,
N3/10
    (K17), (K40), (K40/4)
Current draw


3
(3A)
N3/10





20
(28C)
Ignition: ON 0.1 - 0.3 A  
22.0 P 1 4 2 0 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.
Fuse,
Wiring,
Y32,
N3/10
    Current draw (Y32)

3
(3A)
N3/10




66
(10E)
Ignition: ON 0.4 - 0.6 A  
23.0 P 0 4 1 0 AIR system
(logic chain)


The O2S 1 signal before
TWC is being measured.


23
(31C)



3
(3A)

3
(3A)
N3/10



N3/10






24
(32C)



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 runs.
Voltage
changes to <
100 mV within
20 seconds.
Y32 binding,
AIR combi valve,
AIR pump no output.
24.0 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 speed:
< approx. 3500 rpm

Engine speed:
> approx. 3500 rpm


< 1 V


11 - 14 V
Wiring,
Y22/6,
N3/10
    Y22/6
Current draw


3
(3A)
N3/10



68
(12E)
Ignition: ON 0.4 - 0.6 A  
25.0 P 1 5 2 5 Adjustable camshaft timing
solenoid (Y49)

Current draw

1
Y49


2

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
25.1 ,
26.0 ,
N3/10
25.1   Resistance (Y49)

60
(4E)
N3/10




2
(2A)
Ignition: OFF 7 - 12 Wiring,
Y49
26.0 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).
27.0 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. 1
minute, purge
control valve
(Y58/1) must
noticeably cycle
(Fig. 5 to 7),
Signal see
(Figure 8).
Wiring,
Y58/1,
28.0 ,
N3/10
    Current draw (Y58/1)

3
(3A)
N3/10



13
(21C)
Ignition: ON 0.3 - 0.5 A  
28.0 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 7).

Engine at operating
temperature and at idle.
After approx.
1 minute,
> 50 mbar and
needle
oscillates,
Y58/1 must
cycle.
Vacuum line,
Y58/1
29.0 P 0 4 4 0
P 0 4 4 2
P 0 4 4 6
P 0 4 5 5
Only
Model 140, 210 only,
Model 129 as of 09/97
Purge system
Leaks

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






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 (Figure 6 and 7).

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


Charcoal canister,
Y58/4,
Purge control valve (Y58/1)
30.0 P 0 4 4 6 Only
Model 140, 210 only,
Model 129 as of 09/97
Activated charcoal canister
shut-off valve (Y58/4)
Current draw


3
(3A)
N3/10




34
(2D)
Ignition: ON 0.5 - 0.9 A Fuse,
Wiring,
Y58/4
31.0 P 0 4 4 6
P 0 4 5 0
P 0 4 5 5
Only
Model 140, 210
Model 129 as of 09/97
Fuel tank pressure
sensor (B4/3)
Sender signal

Activated charcoal canister
shut-off valve (Y58/4)
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 (Figure 6 and 7).

Ignition: ON


Apply approx. 25 mbar of
vacuum.









> 2.9 V


< 2.3 V
31.1 ,
Wiring,
Vacuum line,
Charcoal canister plugged,
B4/3
31.1   Only
Fuel tank pressure
sensor (B4/3)
Voltage supply


36
(4D)
N3/10




38
(6D)
Ignition: ON 4.7 - 5.3 V N3/10
32.0 P 0 4 5 0
Only
Model 129, 202 up to 08/97
Purge monitoring pressure
sensor (B4/4)
Sender signal


36
(4D)
N3/10




37
(5D)
Disconnect purge line (A) to charcoal canister on purge monitoring pressure sensor (B4/4).
Connect vacuum tester to purge monitoring pressure sensor (Figure 9 and 10).

Ignition: ON


Apply approx. 300 mbar
of vacuum.











> 3.5 V


< 3 V
Wiring,
32.1 ,
B4/4
32.1   Purge monitoring pressure
sensor (B4/4)
Voltage supply


36
(4D)
N3/10




38
(6D)
Ignition: ON 4.7 - 5.3 V N3/10
33.0 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 33.1 - 33.2,
Data line.
33.1   CAN element in DAS
control module (N54/1)
Resistance


43
(11D)
N3/10




44
(12D)
Ignition: OFF
Disconnect connector D
from engine control
module N3/10,
(Figure 11).
115 - 125 Wiring,
N54 or N54/1
33.2   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
34.0 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
35.0   Diagnosis line
Activation


3
(3A)
N3/10



31
(39C)
Ignition: ON


11 - 14 V Wiring,
N3/10