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Diagnostic Manual, Engines, Volume 3

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LOCATION:    7.3 Cruise Control/Idle Speed Control (CC/ISC)   >   11 Diagnosis - Diagnostic Trouble Code (DTC) Readout

Diagnosis - Diagnostic Trouble Code (DTC) Readout

Preparation for DTC Readout
Connect impulse counter scan tool and/or HHT to data link connector (X11/4) according to connection diagram (see section 0).
Model 124: yellow wire to socket 14
Models 129, 140, 202: yellow wire to socket 7
Model 210:
Note concerning Electronic Traction System (ETS) adaptation (only model 202, as of 06/94)
If the CC/ISC control module (N4/3) is replaced, or if a control module from another vehicle is temporarily installed, the ETS adaptation must be activated. Thereby allowing the CC/ISC control module to adapt to the vehicle configuration, ie: with ETS or ABS only.

ETS Adaptation
1. Ignition: ON
2. Wait 3 seconds
3. Engine: Start
4. Wait seven seconds
5. Ignition: OFF Absolutely required.
6. Ignition: ON


Possible cause Test step/Remedy 1)
No fault in system -

CC/ISC control module (N4/3)
Closed throttle position switch (M16/3s2)
Stop lamp switch (S9/1)
Cruise control switch (S40) OFF
CC/ISC control module (N4/3)
Actual value potentiometer
Starter lock-out/back-up lamp switch (S16/3) (transmission range recognition)
Engine speed (TN) signal
Vehicle speed signal (VSS)
Safety relay within CC/ISC control module (N4/3)
CC/ISC control module (N4/3)
Engine harness
23 6.0-8.0
24 16.0
23 2.0
23 4.0 , 5.0
23 11.0
23 13.0
23 15.0

Check harness wire insulation.
Conditions for activation of CC/ISC actuator (M16/2) not fulfilled. Conditions:
Engine: OFF
Transmission range: P/N

CC/ISC actuator (M16/2)
Throttle valve actual value potentiometer (M16/2r1)
Drive actual value potentiometer (M16/2r2)
Safety contact switch (M16/2s1)
CTP switch recognition (M16/2s2)
Potentiometer voltage supply
Reset not accomplished (actuator adaptation)
23 3.0-10.0
23 5.0
23 4.0
23 6.0
, 8.0
23 7.0
23 3.0

Erase DTC:
Ignition: OFF
Ignition: ON (for at least 90 seconds)
If DTC reappears:
CC/ISC actuator (M16/2)
CC switch (S40) 23 2.0
Stop lamp switch (S9/1) 23 16.0
Not valid for U.S. vehicles  

CAN databus:
Message from CC/ISC control module (N4/3) faulty
Reception from engine control module (N3/4) faulty
23 19.0

Left front axle VSS sensor (L6/1) from ABS (N30) or ETS/SPS (N47-2) control module 23 14.0
Rear axle VSS sensor (L6) from ABS control module (N30)
Left rear axle VSS sensor (L6/3) from ETS/SPS control module (N47-2)
23 15.0
Incorrect CC/ISC control module (N4/3) installed N4/3
ETS signal 23 20.0
Engine speed signal (TN) from engine control module (N3/4) 23 13.0

Fuel safety shut-off signal to engine control module (N3/4) 23 17.0
1) Observe Preparation for Test, see 22 .