Diagnostic Manual, Engines, Volume 3
Electrical Test Program - Cruise Control Test
Test step
|
Test scope
|
Test connection
|
Test condition
|
Nominal value
|
Possible cause/remedy
|
| 1.0 |
Cruise control switch (S40)
V Decelerate/set
B Accelerate/set
SP Resume
A Off |
22 
22 |
|
 16
18 |
Ignition: ON
Switch not activated
Position "DECEL"
Switch not activated
Position "RESUME"
|
< 1 V
11-14 V
< 1 V
11-14 V |
Open/short circuit,
Cruise control switch (S40) defective. |
| |
|
22
22 |
|
32
35 |
Switch not activated
Position "ACCEL"
Switch not activated
Position "OFF"
|
< 1 V
11-14 V
11-14 V
< 1 V |
|
| 2.0 |
Stop lamp switch (S9/1) |
22 |
N4/1
|
14 |
Ignition: OFF
Brake pedal not applied
Brake pedal applied
|
< 10 
> 500 k |
Open/short circuit,
Stop lamp switch (S9/1) defective. |
| 3.0 |
Speed signal |
22 |
N4/1
|
12 |
Ignition: ON
Drive vehicle on dynamometer or road
(> 13 mph, 20 km/h).
|
> 1 V
|
Open/short circuit,
Electronic speedometer with top speed limitation (A1p8) defective. |
| 4.0 |
Speed sensor supply signal
Models 124, 129.066 with 4-speed automatic transmission only! |
11 |
N4/1
|
1
|
Ignition: ON
|
11 - 14 V |
Open/short circuit,
Check wiring for correct terminal layout. |
| 5.0 |
EA/CC actuator (M16/1) |
22 |
N4/1
|
12 |
Model 129 only: Remove instrument cluster and unplug connector "1".
Connect signal generator. Set frequency to > 150 Hz and voltage to 5 V.
Ignition: ON
Cruise control switch position "ACCEL" |
M16/1 adjusts to wide open position
|
EA/CC control module (N4/1) defective.
|
| [5.0] |
|
|
|
|
Position "DECEL"
Position "OFF"
Position "RESUME"
Apply brake pedal |
EA/CC actuator (M16/1) adjusts towards closed throttle position.
M16/1 must move towards closed throttle position.
M16/1 must adjust to previously set position.
M16/1 must go to closed throttle position.
|
|
 |
 |
|
Printable version
