 |
 |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
| 1.0 |
  
 |
ESP control
module (N47-5)
Circuit 30
Voltage supply from fuse and relay box (F23/1)
|
44 
(1.44)
46
(1.46) |
|
 45
(1.45)
47
(1.47)
|
In order to apply a load onto the voltage source:
ignition: ON
|
11 - 14 V
|
Wiring,
Fuse f9 and F8 in F23/1, for model 202,
Fuse f3 in F31 for model 170,
Values >14 V:
check generator (G1). |
| 1.1 |
|
Voltage supply for circuit 87 from passenger-side fuse and relay module box (K40/4).
|
44
(1.44)
|
N47-5
|
18
(1.18) |
Ignition: ON |
11 - 14 V |
Wiring,
Fuse in K40/4 for model 202,
Fuse f1 in K40k5 for model 170.
|
| 2.0 |
|
Diagnostic output
Resistance of K harness |
X11/4
6
|
|
N47-5
8
(1.8)
|
Ignition: OFF
Disconnect N47-5 from test cable. |
< 1 
|
Wiring,
Passenger-side fuse and relay module box (K40/4).
|
| 3.0 |
 |
Steering angle
sensor (N49) Model 202:
Voltage supply
circuit 30
Model 170: |
44
(1.44)
2 |
N49
N49
|
4
4 |
Ignition: OFF
Disconnect connector at N49.
|
11 - 14 V
|
Wiring.
Fuse f13 in F1 for model 170. |
| 3.1 |
|
Voltage supply
Circuit 87 Model 202:
Model 170: |
3
2 |
N49
N49
|
2
3 |
Ignition: ON
|
11 - 14 |
Wiring. |
| 4.0 |
 |
ESP brake pressure
sensor 1
ESP brake pressure
sensor 2
Actual values: brake pressure
|
|
|
|
Ignition: ON
Readout brake pressures
for B34/1 and B34/2
brake not applied:
B34/1
B34/2 |
-7 to +7 bar
-7 to +7 bar |
Wiring,
B34/1,
B34/2
4.1,
4.2,
4.3
|
| 4.1 |
|
Plausibility of the brake pressure signals
|
|
|
|
Ignition: ON
Readout brake pressures
for B34/1 and B34/2
and determine the
difference between the two
values.
Apply medium pedal
pressure. |
-20 to +20 bar
|
Wiring,
B34/1,
B34/2
4.2,
4.3
Other possible faults:
Brake fluid aged,
fluid leak or air in lines of one of
the brake circuits.
|
| 4.2 |
|
Voltage supply for B34/1 from ESP control
module (N47-5) |
11
(1.11) |
N47-5
|
26
(1.26)
|
Ignition: ON
|
4.75 - 5.25 V
|
Wiring,
B34/1 (short circuit),
N47-5.
|
| 4.3 |
|
Voltage supply for B34/2 from ESP control
module (N47-5) |
27
(1.27) |
N47-5
|
40
(1.40)
|
Ignition: ON
|
4.75 - 5.25 V
|
Wiring,
B34/2 (short circuit),
N47-5
|
| 5.0 |
|
ABS lateral acceleration sensor (B24/2)
Voltage supply from ESP control module (N47-5) |
9
(1.9) |
N47-5
|
24
(1.24)
|
Ignition: ON |
4.75 - 5.25 V |
Wiring,
B34/2 (short circuit),
N47-5,
Connector X99/4 om model 170 |
| 6.0 |
|
ESP yaw rate
sensor (N64)
Voltage supply from ESP control module (N47-5) |
25
(1.25) |
N47-5
|
38
(1.38)
|
Ignition: ON |
4.75 - 5.25 V |
Wiring,
N64 (short circuit),
N47-5 |
| 7.0 |
 |
Membrane travel sensor (BAS) (A7/7b1)
Supply voltage from N47-5 |
21
(1.21) |
N47-5
|
22
(1.22)
|
Ignition: ON |
4.75 - 5.25 V |
Wiring,
A7/7b1 (short circuit),
N47-5
|
| 8.0 |
   
 
|
Solenoid valve (BAS) (A7/7y1)
Resistance |
43
(1.43) |
N47-5
 |
14
(1.14)
|
Ignition: ON
Disconnect ESP control module (N47-5) from test cable. |
1 - 2 |
Wiring,
Brake booster for A7/7y1
|
| 9.0 |
|
ESP OFF switch (S76/6) |
|
|
|
S76/6 in position: ON
Hold pressed:
At rest:
S76/6 in position: OFF
Hold pressed:
|
   
>
< |
Wiring,
S76/6
|
| 10.0 |
|
Parking brake switch (S12) and low brake fluid level and parking brake indicator lamp (A1e7) |
|
|
|
Engine: at idle
Apply parking brake pedal:
Parking brake pedal not apply: |
 
Parking brake warning lamp (A1e7): ON
(A1e7): OFF
|
Wiring,
S12,
10.1
A1e7, readout actual values of instrument cluster (A1)
|
| 10.1 |
|
Resistance |
44
(1.44) |
N47-5
|
31
(1.31) |
Ignition: OFF
Disconnect (N47-5) from
test cable.
Parking brake is not
activated:
Parking brake activated:
|
> 20 k
< 1 |
Wiring,
S12
|
| 11.0 |
|
Stop lamp switch (S9/1)
Closed (N.C.) |
|
|
|
Service brake:
Not applied:
Applied:
|
|
Wiring,
S9/1,
ESP stop lamp supression relay (K55),
 23 12.0
ESP control module (N47-5).
|
| 11.1 |
|
Open (N.O.) |
|
|
|
Service brake:
Not applied:
Applied:
|
|
Wiring,
Voltage supply to passenger-side fuse and relay module box (K40/4)
S9/1:
23 12.0
|
| 12.0 |
|
Stop lamp supression relay module (K55)
Voltage supply for circuit 15 from fuse and relay module box (F1) for the circuit of K55
|
|
N47-5
|
5 |
Ignition: ON
K55 disconnected.
Measure at plug socket for K55 |
11 - 14 V
|
Wiring
Fuse in fuse and relay module
box (F1).
|
| 12.1 |
|
Voltage supply for circuit 15 from F1 for the control circuit of K55
|
|
N47-5
|
6 |
Ignition: ON
K55 disconnected.
Measure at plug socket for K55 |
11 - 14 V
|
Wiring
Fuse in fuse and relay module
box (F1).
|
| 12.2 |
|
Signal from S9/1 (N.C.) |
44
(1.44) |
N47-5
|
17
(1.17)
|
Ignition: ON
K55 reconnected.
Service brake not applied:
Service brake applied:
|
< 3 V
11 - 14 V |
Wiring,
Stop lamp supression relay module (K55),
S9/1 |
| 12.3 |
|
Signal from S9/1 (N.O.) |
44
(1.44) |
N47-5
|
17
(1.17)
|
Ignition: ON
K55 reconnected.
Service brake not applied:
Service brake applied:
|
11 - 14 V
< 3 V |
Wiring,
Voltage supply from passenger-side fuse and relay module (K40/4) to S9/1,
S9/1
|
| 12.4 |
|
Activation of K55 |
44
(1.44) |
N47-5
 |
28
(1.28)
|
Ignition: ON
Press service brake:
Bridge not connected:
Bridge connected: |
Stop lamp ON
Stop lamp OFF
|
Wiring,
K55
|
| 13.0 |
|
CAN data lines and Endstage resistance
|
15
(1.15) |
N47-5
|
16
(1.16)
|
Ignition: OFF
|
55 - 65 |
CAN lines,
Endstage resistance of injection system control module (N3),
Endstage resistance of electronic ignition-switch (EIS) control module (N73),
Readout DTC memory of the corresponding control modules.
|
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