| Test step |
DTC |
Scope of test
|
Test connection
|
Test condition
|
Nominal value
|
Possible cause/remedy
|
| 1.0 |
  |
CC/ISC control module (N4/3)
Voltage supply
Circuit 87 |
78  (1.37)
79 (1.38)
|
|
 76 (1.35)
77
(1.36)
|
Ignition: ON |
11 - 14 V |
 1.1 ,
Wiring,
Base module (N16/1),
DM, Chassis and Drivetrain, Vol. 1, section 1.1 |
| 1.1 |
|
Model 124
Ground, component compartment (W16)
Model 140
Ground, output ground, electronics (W15)
(right footwell) |
N4/3
78 (1.37)
N4/3
79 (1.38) |
|
X11/4
3
X11/4
3
|
Ignition: ON
Ignition: OFF
|
11 - 14 V |
Wiring,
W15 (Model 140),
W16 (Model 124). |
| 2.0 |
 |
Cruise control switch (S40)
V Decelerate/set
SP Resume
B Accelerate/set
A Off
Control switch contact |
|
|
51
(1.10)
72 (1.31)
52 (1.11)
74
(1.33)
43 (1.2) |
Ignition: ON
Switch not activated
Position "DECEL"
Position "RESUME"
Position "ACCEL"
Switch not activated
Position "OFF"
Switch not activated
Control switch contact in position:
"DECEL"
"ACCEL"
"RESUME"
"OFF"
|
< 1 V
11 - 14 V
11 - 14 V
11 - 14 V
11 - 14 V
< 1 V
< 1 V
11 - 14 V |
Wiring,
S40. |
| 3.0 |
 |
CC/ISC actuator (M16/2)
Voltage supply
Drive actual value potentiometer (M16/2r1) and throttle valve actual value potentiometer (M16/2r2)
|
10 (2.10) |
N4/3
|
12 (2.12) |
Ignition: ON |
4.7 - 5.3 V
Reference value for
tables I , II . |
Wiring,
CC/ISC actuator (M16/2)
CC/ISC control module (N4/3). |
| 4.0 |
|
CC/ISC actuator (M16/2)
Drive actual value potentiometer (M16/2r1) signal |
79 (1.38)
79 (1.38)
79 (1.38) |
|
56 (1.15)
53 (1.12)
9
(2.9) |
Ignition: OFF
Unplug ABS control module (N30)
Connect first signal generator.
(front axle speed simulation)
Set voltage to 10 V.
f = value from table IV
Connect second signal generator.
(rear axle speed simulation)
Set voltage to 10 V.
f = value from table IV
Ignition: ON
Accelerator pedal position:
Closed throttle position.
|
Table I,
column " a ".
|
Wiring,
CC/ISC actuator (M16/2),
CC/ISC control module (N4/3). |
| [4.0] |
|
|
|
|
|
Activate cruise control
switch (S40).
Position: "ACCEL".
Note:
Activate switch until constant voltage value can be read.
|
Table I ,
columns " b ", |
|
| 5.0 |
|
CC/ISC actuator (M16/2)
Throttle valve actual value potentiometer (M16/2r2) signal
|
10 (2.10) |
N4/3
|
8 (2.8) |
Ignition: ON
Accelerator pedal position:
Closed throttle
Wide open throttle or
Kickdown |
Table II,
column " e ",
column " f ",
|
Wiring,
CC/ISC actuator (M16/2),
CC/ISC control module (N4/3). |
| 6.0 |
|
CC/ISC actuator (M16/2)
Voltage supply
safety contact switch
(M16/2s1) and closed throttle position recognition switch (M16/2s2)
|
79 (1.38) |
N4/3
|
16 (2.16) |
Ignition: ON
Accelerator pedal position:
Closed throttle |
6 - 12 V
(value jumps)
|
Wiring,
CC/ISC actuator (M16/2). |
| 7.0 |
|
CC/ISC actuator (M16/2)
safety contact switch (M16/2s1) switching point |
79 (1.38) |
N4/3
|
35 (2.35) |
Ignition: ON
Accelerator pedal position:
Closed throttle
Slowly depress accelerator until switching point occurs.
|
6 - 12 V
(value jumps)
 1 V |
Wiring,
CC/ISC actuator (M16/2).
|
| 8.0 |
|
CC/ISC actuator (M16/2)
Closed throttle position recognition switch (M16/2s2) switching point
To reference the correct voltage value in Table III, columns "h" and "i", observe the reference value obtained in test step 3.0. |
|
|
56 (1.15)
53 (1.12) |
Ignition: OFF
Unplug ABS control module (N30).
Connect first signal generator.
(front axle speed simulation)
Set voltage to 10 V.
f = value from table IV
Connect second signal generator.
(rear axle speed simulation)
Set voltage to 10 V.
f = value from table IV
|
|
Wiring,
CC/ISC actuator (M16/2). |
| [8.0] |
|
|
79 (1.38)
79 (1.38) |
|
9 (2.9)
38 (2.38) |
Connect first multimeter .
Connect second multimeter .
Ignition: ON
Read voltage on first multimeter (drive actual value potentiometer)
Read voltage on second multimeter (safety contact switch)
Hold CC switch in position "ACCEL" until voltage on first multimeter does no longer drop (drive actual value potentiometer)
|
Table III ,
column " h "
6 - 10 V
(value jumps, safety contact switch closed)
Table III ,
column " i " |
|
| [8.0] |
|
|
|
|
|
Simultaneously read voltage on second multimeter (safety contact switch)
Note:
If voltage does not drop release CC switch, change frequency slightly on second signal generator and repeat test procedure.
|
1 V
(safety contact switch open) |
|
| 9.0 |
|
CC/ISC actuator (M16/2)
Actuator motor (M16/2m1) resistance |
21 (2.21)
22 (2.22) |
|
20 (2.20)
41 (2.41) |
Ignition: OFF
Accelerator pedal position:
Closed throttle
|
< 10  |
Wiring,
CC/ISC actuator (M16/2). |
| 10.0 |
|
CC/ISC actuator (M16/2)
Magnetic clutch (M16/2k1) |
19 (2.19) |
N4/3
|
40 (2.40) |
Ignition: ON
|
7.5 - 10 V
|
Wiring,
CC/ISC actuator (M16/2).
CC/ISC control module (N4/3).
|
| 11.0 |
 |
Starter lock-out/backup lamp switch (S16/3)
Transmission range recognition voltage |
44 (1.3) |
N4/3
|
45 (1.4) |
Ignition: ON
Transmission range:
P 
R
N
D
3
2
|
1.0 V
0.3 V
4.0 V
3.5 V
2.5 V
1.8 V
(± 10%)
|
Wiring,
Starter lock-out/backup lamp
switch (S16/3),
11.1
CC/ISC control module (N4/3). |
| 11.1 |
|
Transmission range recognition
resistance |
44 (1.3) |
N4/3
|
45 (1.4) |
Ignition: OFF
Unplug CC/ISC control
module (N4/3).
Transmission range:
P
R
N
D
3
2
|
1400
294
28000
11400
5900
3100
(± 10%)
|
Wiring,
Starter lock-out/backup lamp
switch (S16/3).
|
| 12.0 |
|
CC/ISC control module (N4/3)
A/C compressor signal |
79 (1.38) |
N4/3
|
57 (1.16) |
Engine: Start
Accelerator pedal position:
Closed throttle
Switch on climate control (A/C compressor)
|
<1 V
11 - 14 V |
Wiring,
Base module (N16/1),
DM, Chassis and Drivetrain, Vol. 1, section 1.1 |
| 13.0 |
Model 140 with engine 119 |
CC/ISC control module (N4/3)
Idle speed increase signal from diode matrix (V2) 1) |
79 (1.38) |
N4/3
|
73 (1.32) |
Engine: Start
Accelerator pedal position:
Closed throttle
Switch on the following consumers individually:
Front seat heaters
Rear seat heaters
Rear window defroster
Blower speed setting 3
|
<1 V
11 - 14 V
11 - 14 V
11 - 14 V
11 - 14 V |
Wiring,
Idle speed increase diode
matrix (V2),
13.1.
|
| 13.1 |
|
Idle speed increase diode matrix (V2) (right footwell)
Voltage supply |
W15 |
V2
|
3 |
Ignition: OFF
Ignition: ON
|
<1 V
11 - 14 V |
Fuse,
Wiring. |
| 14.0 |
 |
CC/ISC control module (N4/3)
Engine speed (TNA) signal from base module (N16/1) |
79 (1.38) |
N4/3
|
75
(1.34) |
Engine: Start
Accelerator pedal position:
Closed throttle position |
6 - 12 V |
Wiring,
Base module (N16/1),
DM, Chassis and Drivetrain, Vol. 1, section 1.1.
|
| 15.0 |
 |
Left front axle vehicle speed
sensor (L6/1)
Speed signal |
79 (1.38) |
N4/3
|
56 (1.15) |
Lift front of vehicle.
ABS control module connected.
Ignition: ON
Turn left front wheel by hand
Note:
Upon completion of test, erase DTC's from ABS control module (N30) memory.
|
4 - 8 V ~ |
Wiring,
Left front axle vehicle speed
sensor (L6/1)
ABS control module (N30)
DM, Chassis and Drivetrain, Vol. 2, section 6.2. |
| 16.0 |
 |
Rear axle vehicle speed sensor (L6)
Speed signal |
79 (1.38) |
N4/3
|
53 (1.12) |
Lift rear of vehicle.
ABS control module installed.
Ignition: ON
Turn left rear wheel by hand
Note:
Upon completion of test, erase DTC's from ABS control module (N30) memory.
|
4 - 8 V ~ |
Wiring,
Rear axle vehicle speed
sensor (L6/1)
ABS control module (N30)
DM, Chassis and Drivetrain, Vol. 2, section 6.2. |
| 17.0 |
 |
Stop lamp switch (S9/1)
Signal (N.O. contact) |
79 (1.38) |
N4/3
|
71 (1.30) |
Ignition: ON
Brake pedal not applied
Brake pedal applied |
<1 V
11 - 14 V |
Wiring,
Stop lamp switch (S9/1).
17.1 ,
Fuse,
ABS control module (N30) |
| 17.1 |
|
Stop lamp switch (S9/1)
Signal (N.C. contact) |
79 (1.38) |
N4/3
|
54 (1.13) |
Ignition: ON
Brake pedal not applied
Brake pedal applied |
11 - 14 V
<1 V |
Wiring,
Stop lamp switch (S9/1),
ABS control module (N30)
|
| 18.0 |
|
Non-USA vehicles only!
Continue to next test step |
|
|
|
|
|
|
| 19.0 |
|
CC/ISC control module (N4/3)
Fuel safety shut-off signal to LH-SFI control module (N3/1) |
79 (1.38) |
N4/3
|
48 (1.7) |
Ignition: ON
|
2 - 11 V
(value jumps) |
Wiring,
CC/ISC control module (N4/3),
CC/ISC actuator (M16/2),
LH-SFI control module (N3/1)
DM, Engine, Vol. 2, section 3.1
|
| 20.0 |
|
CC/ISC control module (N4/3)
Idle speed recognition signal to LH-SFI control module (N3/1) |
79 (1.38) |
N4/3
|
65 (1.24) |
Ignition: ON
Closed throttle position
Accelerator pedal applied
|
4.8 V
 5.5 V |
Wiring,
CC/ISC control module (N4/3), |
| 21.0 |
 |
Serial data bus (CAN) |
"L" |
N4/3x1
|
"H" |
Ignition: OFF
CC/ISC control module (N4/3) unplugged.
Measure resistance at connector (Figure 5).
|
55 - 65 |
Wiring,
LH-SFI control module (N3/1), see
DM, Engine, Vol. 2, section 3.1,
Ignition control module (N1/3), see DM, Engine, Vol. 2, section 5.2. |
Printable version
