Diagnostic Manual, Engines, Volume 3
Electrical Test Program - Test
| Test step |
DTC |
Scope of test
|
Test connection
|
Test condition
|
Nominal value
|
Possible cause/remedy
|
| 1.0 |
|
Diagnostic module (N59)
Voltage supply
Circuit 30 |
1  (1.01)
|
N59
|
 4
(1.04)
|
Ignition: ON |
11 - 14 V |
Fuse 9,
open circuit,
 1.1.
|
| 1.1 |
|
Main ground
(behind instrument cluster, W1) |
N59
1 (1.01) |
|
X11/4
16 |
Ignition: ON |
11 - 14 V |
Main ground (W1)
|
| 2.0 |
|
Diagnostic module (N59)
Voltage supply
Circuit 87E
|
N59
1 (1.01) |
|
3
(1.03) |
Ignition: ON |
11 - 14 V |
Overvoltage protection relay module (K1/2),
open circuit. |
| 3.0 |
|
Control of "CHECK ENGINE" malfunction indicator lamp
|
9 (1.09)
|
N59
|
3
(1.03)
|
Ignition: ON
|
11 - 14 V |
N59. |
| 4.0 |
|
Control of pushbutton (X11/21) |
6 (1.06)
|
N59
|
3
(1.03)
|
Ignition: ON
Press pushbutton (X11/21).
|
11 - 14 V |
Open circuit,
Pushbutton (X11/21),
N59.
|
| 5.0 |
|
Diagnostic module coding
|
2 (1.02)
|
N59
|
3
(1.03)
|
Ignition: ON |
11 - 14 V |
Open circuit. |
| 6.0 |
17 |
CAN data bus |
L |
N59
|
H |
Ignition: OFF
Unplug test cable or diagnostic module. Test with ohmmeter directly at the the two wide connections of the diagnostic module connector (see Figure 2).
|
55 - 65  |
Data line,
6.1 ,
6.2. |
| 6.1 |
17 |
CAN element in
engine control module (N3/4)
Resistance
|
L  |
N3/4
|
 H |
Unplug connector 1 at N3/4 and test directly with an ohmmeter at N3/4 (see Figure 3).
|
115 - 125 |
N3/4. |
| 6.2 |
17 |
CAN element in EA/CC/ISC (N4/1) or CC control module (N4/3)
Resistance |
20
44
|
N4/1
N4/3
|
21
45
|
Remove N4/1 or N4/3 in the passenger side footwell. Test directly at N4/1 or N4/3 connector 1 pin 20 and 21
(see Figures 4 and 5).
|
115 - 125 |
N4/1 or N4/3. |
| 7.0 |
23 |
Diagnostic module pressure sensor (B5/2)
Voltage |
1 (1.1) |
N59
|
18
(1.18)
|
Connect pressure gauge to B5/2 with Y-distributor (see Figure 6)
Ignition: ON
Engine: at Idle
|
> 3.5 V
< 2 V
and pressure rises to
> 500 mbar
|
Vacuum line,
open circuit,
B5/2. |
 |
 |
|
Printable version
