 |
  |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
|
LH-SFI control
module (N3/1)
Voltage supply
Circuit 30 |
64 
(1.23) |
N3/1
 |
 67
(1.26)
|
Ignition: ON |
11 - 14 V |
1.1 - 1.3 |
| 1.1 |
|
Ground connection |
N3/1
64
(1.23) |
|
X11/4
2 |
Ignition: ON |
11 - 14 V |
Wiring,
Model 124
Ground, component compartment (W16, Figure 9)
Model 129
Ground (module box bracket) (W27, Figure 5)
Model 140
Ground (electronics output ground - right footwell) (W15, Figure 17).
|
| 1.2 |
|
Base module (N16/1)
Voltage supply
Circuit 30 |
28
(1.28)
29
(1.29)
|
|
1
(3.1)
1
(3.1)
|
Ignition: OFF
Connect socket box to N16/1.
Ignition: ON |
11 - 14 V |
Wire to terminal block (X4/10) (Figures 1 - 3). |
| 1.3 |
9 |
DTC readout from base module (N16/1)
Voltage supply from N16/1 to LH-SFI control module (N3/1)
Circuit 30
|
28
(1.28) |
N16/1
|
12
(1.12) |
Ignition: ON |
11 - 14 V |
N16/1. |
| 2.0 |
|
LH-SFI control
module (N3/1)
Voltage supply
Circuit 87/M1e |
76
(1.35) |
N3/1
|
77
(1.36)
|
Ignition: ON |
11 - 14 V |
2.1 - 2.5 |
| 2.1 |
|
Ground connection |
N3/1
76
(1.35)
|
|
X11/4
2 |
Ignition: ON |
11 - 14 V |
Wiring,
Model 124
Ground, module box bracket (W27, Figure 9)
Models 129 and 140
Ground, electronics (right footwell) (W15/1, Figure 16 and 17).
|
| 2.2 |
|
Base module (N16/1)
Voltage supply
Circuit 15 unfused |
28
(1.28) |
N16/1
|
34
(1.34)
|
Connect socket box to N16/1.
Ignition: ON
Ignition: OFF |
11 - 14 V
< 1 V |
Wiring,
Ignition/starter switch (S2/1),
Wiring,
S2/1.
|
| 2.3 |
|
Base module (N16/1)
Voltage supply
Circuit 15 |
28
(1.28) |
N16/1
|
15
(1.15)
|
Ignition: ON
Ignition: OFF |
11 - 14 V
< 1 V |
Wiring,
Fuse. |
| 2.4 |
|
Output ground,
base module (N16/1) |
N16/1
28
(1.28)
N16/1
29
(1.29) |
|
X11/4
2
X11/4
2
|
Ignition: ON |
11 - 14 V
11 - 14 V |
Ground wire. |
| 2.5 |
1 0 |
DTC readout from base module (N16/1)
Voltage supply (fused) for
LH-SFI control module (N3/1)
|
28
(1.28) |
N16/1
|
7
(1.7) |
Ignition: ON
Ignition: OFF |
11 - 14 V
< 1 V |
Fuse (F2) at N16/1,
N16/1. |
| 3.0 |
|
LH-SFI control
module (N3/1)
Voltage supply
Circuit 87 |
78
(1.37) |
N3/1
|
65
(1.24)
|
Ignition: ON |
11 - 14 V |
Wiring,
3.1 |
| 3.1 |
|
Ground connection |
N3/1
78
(1.37)
|
|
X11/4
2 |
Ignition: ON |
11 - 14 V |
Model 124
Ground, component
compartment (W16)
Models 129 and 140
Ground, electronics output ground (W15, right footwell)
|
| 4.0 |
1 0 |
DTC readout from base module (N16/1)
Voltage supply for injectors
|
28
(1.28) |
N16/1
|
38
(2.38) |
Connect socket box to N16/1
Ignition: ON
Ignition: OFF
|
11 - 14 V
< 1 V
|
Fuse (F2) at N16/1. |
| 5.0 |
4 1) |
Hot wire MAF sensor (B2/2)
Voltage at hot wire |
34
(2.34) |
N3/1
|
17
(2.17)
|
Connect socket box to N3/1
Ignition: ON
Engine: at Idle
|
1.0 - 1.2 V
1.3 - 1.7 V 2) |
Wiring,
5.1 ,
6.0 ,
B2/2. |
1) The DTC " 4 " can be displayed on vehicles up to 7/91 even if no fault exists.
2) Voltage increases with increasing rpm. |
| 1) The DTC " 4 " can be displayed on vehicles up to 7/91 even if no fault exists. |
| 8.0 |
9 |
FP relay module (K27)
Control signal |
66
(1.25) |
N3/1
|
65
(1.24)
|
Engine: Start |
11 - 14 V
while cranking. |
8.1 ,
LH-SFI control module (N3/1). |
| 8.1 |
|
Starter signal
Circuit 50 |
64
(1.23) |
N3/1
|
75
(1.34)
|
Engine: Start |
11 - 14 V
while cranking. |
Wiring. |
| 9.0 |
2 |
ECT sensor (B11/2)
Voltage at sensor circuit 1 |
16
(2.16) |
N3/1
|
18
(2.18) |
Ignition: ON |
C °
|
V |
 |
9.1 ,
N3/1. |
| 20 |
3.5 |
2500 |
| 30 |
3.1 |
1700 |
| 40 |
2.7 |
1170 |
| 50 |
2.3 |
830 |
| 60 |
1.9 |
600 |
| 70 |
1.5 |
435 |
| 80 |
1.2 |
325 |
| 90 |
1.0 |
245 |
| 100 |
0.8 |
185 |
| |
±5% |
± 5% |
| 9.1 |
|
Resistance
Sensor circuit 1 |
16
(2.16) |
N3/1
 |
18
(2.18)
|
Ignition: OFF
Disconnect N3/1 from contact box (070). |
Nominal values, see 9.0 |
Wiring,
9.2 . |
| 9.2 |
|
Resistance
ECT sensor (B11/2)
Sensor circuit 1 |
2 |
B11/2
|
4 |
Connector on B11/2 unplugged. |
Nominal values, see 9.0 , Connection see Figure 24.
|
B11/2. |
| 10.0 |
3 |
ECT sensor (B11/2)
Voltage at sensor circuit 2 |
16
(2.16) |
N3/1
|
31
(2.31) |
Ignition: ON |
C °
|
V |
|
10.1 ,
LH-SFI control module (N3/1). |
| 20 |
3.5 |
2500 |
| 30 |
3.1 |
1700 |
| 40 |
7 |
1170 |
| 50 |
2.3 |
830 |
| 60 |
1.9 |
600 |
| 70 |
1.5 |
435 |
| 80 |
1.2 |
325 |
| 90 |
1.0 |
245 |
| 100 |
0.8 |
185 |
| |
±5% |
± 5% |
| 10.1 |
|
Resistance
Sensor circuit 2 |
16
(2.16) |
N3/1
|
31
(2.31)
|
Ignition: OFF
Disconnect N3/1 from contact box (070). |
Nominal values, see 10.0 |
Wiring,
10.2 |
| 10.2 |
|
Resistance
ECT sensor (B11/2)
Sensor circuit 2 |
1 |
B11/2
|
3 |
Connector on B11/2 unplugged. |
Nominal values, see 10.0 , Connection see Figure 24.
|
B11/2. |
| 11.0 |
1 3 |
IAT sensor (B17/7)
Voltage
|
16
(2.16) |
N3/1
|
8
(2.8) |
Ignition: ON |
C ° |
V |
|
11.1 ,
LH-SFI control module (N3/1). |
1
20
30
40
50
60
70
80
|
1.8
1.5
1.2
0.9
0.6
0.5
0.4
0.3
±5%
|
3700
2500
1700
1170
830
600
435
325
± 5% |
| 11.1 |
|
Resistance
|
16
(2.16) |
N3/1
|
8
(2.8)
|
Ignition: OFF
Disconnect N3/1 from socket box. |
Nominal values, see 11.0 |
Wiring,
IAT sensor (B17/7). |
| 12.0 |
7 |
TN-signal (rpm signal) - input
from DI control module (N1/3)
|
76
(1.35)
76
(1.35)
|
|
5
(2.5)
5
(2.5)
|
Engine: Start
Engine: at Idle |
Signal, see Figure 21.
5 - 7.5 V |
Wiring,
N1/3,
N3/1. |
| 13.0 |
|
LH-SFI control
module (N3/1)
TN-signal (rpm signal) - output |
76
(1.35)
76
(1.35) |
|
69
(1.28)
69
(1.28)
|
Engine: Start
Engine: at Idle |
Signal, see Figure 21.
5 - 7.5 V. |
Wiring,
N3/1,
Base module (N16/1). |
1) Test with oscilloscope.
2) Test with multimeter only if oscilloscope is not available. |
| 14.0 |
8 |
CMP sensor (L5/1) signal
from DI control module (N1/3)
|
77
(1.36)
77
(1.36) |
|
6
(2.6)
6
(2.6)
|
Engine: Start
Engine: at Idle |
Signal, see Figure 20.
0.8 - 1.5 V~ |
Wiring,
L5/1 (Test, see DM, Engines, Vol. 2, section 5.2),
N1/3. |
| 15.0 |
1 0 3) |
CTP (idle) recognition signal
from
EA/CC/ISC actuator (M16/1) |
76
(1.35) |
N3/1
|
52
(1.11)
|
Ignition: ON
Accelerator pedal in
CTP (idle).
Accelerator pedal in
WOT (full throttle).
|
 4.8 V
 5.5 V |
Wiring,
M16/1 (Test, see DM, Engines,
Vol. 3, section 6.2) ,
EA/CC/ISC control module (N4/1). |
1) Test with oscilloscope.
2) Test with multimeter only if oscilloscope is not available.
3) The DTC " 1 0 " can be displayed on vehicles up to 7/91 even if no fault exists. |
| 16.0 |
|
Fuel safety shut-off
from
EA/CC/ISC actuator (M16/1)
or
CC/ISC actuator (M16/2)
|
76
(1.35) |
N3/1
|
71
(1.30) |
Ignition: ON |
2.2 - 11 V |
Wiring
M16/1 or M16/2 (Test, see DM, Engines, Vol. 3, section 6.2 or 7.1),
N4/1 or N4/3. |
| 17.0 |
|
Fuel safety shut-off |
76
(1.35) |
N3/1
 |
71
(1.30)
|
Engine: Start and apply WOT (full throttle). |
Engine speed surges between 1200 - 2200 rpm. |
N3/1. |
| 18.0 |
2 1 |
O2S 1 (before TWC) (G3/2)
O2S 1 signal |
15
(2.15) |
N3/1
|
14
(2.14)
|
Engine: at Idle
and at operating temperature > 80 C ° let engine run for a minimum of 2 minutes. |
Oscillates between.
-0.2 and +1.0 V by more than 0.3 V |
Wiring,
G3/2,
18.1 ,
18.2 ,
19.0.
|
| 18.1 |
|
Insulation, O2S 1 wire |
13
(2.13) |
N3/1
|
14
(2.14)
|
Ignition: OFF
Disconnect N3/1 from contact box (070). |
 |
Wiring. |
| 18.2 |
|
O2S 1 control from
LH-SFI control module (N3/1) |
14
(2.14) |
N3/1
|
76
(1.35)
|
On-off ratio tester connected.
Engine: at Idle
and at operating temperature > 80 C °
|
90 - 100% at on-off ratio tester |
N3/1. |
| 19.0 |
2 2 |
O2S 1 (before TWC) heater
Control signal |
15
(2.15) |
N3/1
|
9
(2.9)
|
Engine: at Idle
Engine coolant tempera-
ture > 80 C ° |
11 - 14 V |
19.1 ,
N3/1. |
| 19.1 |
|
O2S 1 (before TWC) heater
Current draw |
9
(2.9) |
N3/1
 |
77
(1.36)
|
N3/1 connected in contact box (070).
Ignition: ON |
0.6 - 3.4 A |
Wiring,
G3/2. |
| 20.0 |
1 6 1) |
EGR switchover
valve (Y27)
Control signal |
39
(2.39) |
N3/1
|
77
(1.36)
|
Engine: at Idle
Engine coolant tempera-
ture > 60 C °
Accelerate briefly. |
11 - 14 V |
21.0 - 22.0 ,
Wiring,
N3/1. |
| 1) The DTC " 1 6 " can be displayed on vehicles up to 7/91 even if no fault exists. |
| 20.1 |
|
EGR switchover valve (Y27)
Current draw |
64
(1.23) |
N3/1
|
39
(2.39)
|
Disconnect N3/1 from contact box (070).
Ignition: ON |
0.3 - 0.5 A |
Wiring,
Y27. |
| 21.0 |
|
EGR switchover
valve (Y27)
Vacuum control |
|
|
|
Test connection note:
Connect vacuum tester to EGR valve according to Figure 18.
N3/1 plugged in.
Engine: at Idle
Engine coolant tempera-
ture > 60 C ° .
Accelerate briefly.
|
> 400 mbar |
Vacuum lines,
EGR valve,
Y27. |
| 22.0 |
|
EGR valve
Mechanical test |
|
|
|
Test connection note:
Connect vacuum tester directly to EGR valve.
Using vacuum tester, apply 500 mbar vacuum.
Disconnect vacuum line on EGR valve. |
EGR valve closes audibly.
|
EGR valve. |
| 23.0 |
1 1 1) |
AIR relay module (K17)
Control signal |
19
(2.19) |
N3/1
|
77
(1.36)
|
Disconnect ECT sensor (B11/2) and simulate 2.5 k at sockets 2 and 4 with resistance substitution unit.
Engine: at Idle
|
11 - 14 V
for approx. 2 minutes after start and AIR pump runs. |
23.1 ,
N3/1. |
| 23.1 |
|
AIR relay module (K17)
Current draw |
64
(1.23) |
N3/1
|
19
(2.19)
|
Disconnect N3/1 from contact box (070).
Ignition: ON |
0.1 - 0.3 A |
Wiring,
K17. |
| 24.0 |
2 3 |
Purge control valve (Y58/1)
Control signal |
38
(2.38) |
N3/1
 |
77
(1.36)
|
Engine: at Idle
and at operating temperature. |
After approx. 1 minute, purge control valve (Y58/1, Figure 19) must cycle noticeable.
Signal, see Figure 31. |
24.1 ,
25.0.
N3/1. |
| 24.1 |
|
Current draw |
64
(1.23) |
N3/1
|
38
(2.38)
|
Disconnect LH-SFI control module (N3/1) from contact box (070).
Ignition: ON |
0.2 - 0.4 A |
Wiring,
Y58/1. |
| 1) The DTC " 1 1 " can be displayed on vehicles up to 7/91 even if no fault exists. |
| 25.0 |
|
Purge control valve (Y58/1)
Vacuum control |
|
|
|
Note to test connection:
Connect vacuum tester to Y58/1 (Figure 19), connection (A).
Engine: at Idle
and at operating temperature. |
After approx. 1 minute,
> 400 mbar
|
Vacuum lines,
Y58/1. |
| 26.0 |
2 5 |
Adjustable camshaft timing solenoid (Y49 or Y49/2)
Current draw
Engine 104 (Y49)
Engine 119 right (Y49/2) |
1
1 |
Y49
Y49/2
|
2
2
|
Note to test connection:
Connect test cable (102 589 04 63 00) to solenoid.
Engine: Start and raise engine speed to approx. 3000 rpm.
|
Briefly approx. 1.5 A,
then 1 A |
26.1 ,
28.0 ,
N3/1. |
| 26.1 |
|
Resistance
Engine 104 (Y49)
Engine 119 right (Y49/2)
|
41
(2.41) |
N3/1
|
77
(1.36) |
Disconnect N3/1 from contact box (070). |
4 - 6 |
Wiring,
Y49 or Y49/2. |
| 27.0 |
2 4 |
Engine 119 only
Left adjustable camshaft timing solenoid (Y49/1)
Current draw |
1 |
|
2 |
Note to Test connection:
Connect test cable (102 589 04 63 00) to solenoid (Y49/1).
Engine: Start and raise engine speed to approx. 3000 rpm.
|
Briefly approx. 1.5 A,
then 1 A |
Wiring,
27.1 ,
29.0. |
| 27.1 |
|
Engine 119 only
Resistance |
22
(2.22) |
N3/1
|
77
(1.36)
|
Disconnect N3/1 from contact box (070). |
4 - 6 |
Wiring,
Y49/1. |
| 28.0 |
|
Adjustable camshaft timing solenoid (Y49 or Y49/2)
Mechanical operation
Engine 104 (Y49)
Engine 119 right (Y49/2)
|
41
(2.41) |
N3/1
|
76
(1.35) |
Engine: at Idle
Bridge socket box sockets for maximum of 10 seconds. |
Engine runs unevenly after approx. 5 sec. |
Mechanical camshaft adjustment (see SMS, Job No. 05-216). |
| 29.0 |
|
Engine 119 only
Left adjustable camshaft timing solenoid (Y49/1)
Mechanical operation
|
22
(2.22) |
N3/1
|
76
(1.35) |
Engine: at Idle
Bridge socket box sockets for maximum of 10 seconds. |
Engine runs unevenly after approx. 5 sec.
|
Mechanical camshaft adjustment (see SMS, Job No. 05-216). |
| 30.0 |
6 |
Non-USA vehicles only.
Continue to next test step. |
|
|
|
|
|
|
| 31.0 |
2 8 |
Non-USA vehicles only.
Continue to next test step. |
|
|
|
|
|
|
| 32.0 |
2 7 |
Injectors (Y62)
Resistance and assignment
Engine 104
______________ |
|
N3/1
|
|
Test connection note:
Connect ohmmeter to socket box for each subsequent injector.
Ignition: OFF
Disconnect N3/1 from contact box (070).
Connector on injector connected.
Connector on injector unplugged.
Connector on injector connected.
Connector on injector unplugged. |
14 - 16
14 - 16
|
Wiring,
Y62,
Wires reversed,
33.0
Wiring,
Injectors (Y62),
Wires reversed,
33.0 |
| Cylinder 1 |
27 |
|
77 |
| Cylinder 2 |
25 |
|
77 |
| Cylinder 3 |
26 |
|
77 |
| Cylinder 4 |
2 |
|
77 |
| Cylinder 5 |
4 |
|
77 |
| Cylinder 6 |
3 |
|
77 |
Engine 119
______________ |
|
N3/1
|
|
| Cylinder 1 |
27 |
|
77 |
| Cylinder 2 |
1 |
|
77 |
| Cylinder 3 |
2 |
|
77 |
| Cylinder 4 |
26 |
|
77 |
| Cylinder 5 |
4 |
|
77 |
| Cylinder 6 |
25 |
|
77 |
| Cylinder 7 |
24 |
|
77 |
| Cylinder 8 |
3 |
|
77 |
| 33.0 |
|
Injectors (Y62)
Control and injection time |
|
N3/1
|
|
Test connection note:
For connection information on individual injectors, see 32.0.
Engine coolant temperature approx.
20 C°
at start 
Engine coolant temperature approx.
80 C °
at idle
accelerate briefly
|
Injection time:
approx. 8 ms
approx. 3 - 5 ms
approx. 17 ms
(see signals, Figures 22 and 23)
|
Wiring,
ECT sensor (B11/2),
IAT sensor (B17/7),
O2S 1 (before TWC) (G3/2).
LH-SFI control module (N3/1). |
| 34.0 |
2 6 4) |
Upshift delay switchover
valve (Y3/3)
Current draw |
64
(1.23) |
N3/1
|
20
(2.20)
|
Disconnect N3/1 from contact box (070).
Ignition: ON |
450 ± 80 mA |
Wiring,
Y3/3,
35.0 |
| 4) The DTC " 2 6 " can be displayed on vehicles up to 7/91 even if no fault exists. |
1) 5-speed automatic transmission.
2) 4-speed automatic transmission.
3) On vehicles as of 8/91.
|
| 1) The DTC " 1 8 " can be displayed on vehicles up to 7/91 even if no fault exists. |
|
Printable version
H 
