STI Home
Body And Accessories
Chassis & Drivetrain
Engines
Volume 1
Volume 2
Volume 3
Volume 4
Diesel Engines
Info. / Comm.
Climate Control
Diagnostic Manual, Engines, Volume 3

 Printable version
LOCATION:    6.4 Electronic Accelerator - (EA)   >   23 Electrical Test Program - Test


Electrical Test Program - Test

Test scope
Test connection
Test condition Nominal value Possible cause/Remedy
1.0   EA/CC/ISC control
module (N4/1)
Voltage supply
Circuit 87 unfused
Model 124, 202, 210






Model 129, 140



37
(1.37)

38
(1.38)





78
(1.37)

79
(1.38)
N4/1








N4/1





35
(1.35)

36
(1.36)





76
(1.35)

77
(1.36)
Ignition: ON 11 - 14 V 1.1 ,

Model 124, 202
Fuse on overvoltage protection relay module (K1/2)

Model 129, 140
Base module (N16/1) see Diagnostic Manual, Chassis and Drivetrain, Vol. 1 - 1.1

Model 210
Relay module (K40) see Diagnostic Manual, Chassis and Drivetrain, Vol. 1 - 1.1
1.1   Ground
Model 124
Main ground (W1)
(behind instrument cluster)



Model 129
Ground on module box bracket (W27)
Model 140
Ground in right footwell (W15)


Model 202
Ground in right component compartment (W16/4)
Model 210
Output ground on right wheel well (W16/4)
N4/1

37
(1.37)
38
(1.38)



N4/1

78
(1.37)
79
(1.38)




N4/1

37
(1.37)
38
(1.38)
























X11/4
16

16




X11/4
3


3






X11/4
3



3

Ignition: ON








Ignition: OFF








Ignition: OFF 		11 - 14 V Wiring,
Model 124: W1
Model 129: W27
Model 140: W15
Model 202: W16/4
Model 210: W16/4
2.0
EA/CC/ISC actuator (M16/1)
Voltage supply
Reference potentiometer (M16/1r1) and
Actual value potentiometer (M16/1r2)
Model 124, 202, 210



Model 129, 140







37
(1.37)


78
(1.37)





N4/1



N4/1








75
(2.12)


12
(2.12)
Ignition: ON

4.7 - 5.3 V
Reference value for tables I or II
Wiring,
EA/CC/ISC actuator (M16/1).
3.0 EA/CC/ISC actuator (M16/1)
Reference potentiometer (M16/1r1) signal
Model 124, 202, 210



Model 129, 140





37
(1.37)



78
(1.37)



N4/1



N4/1






71
(2.8)



8
(2.8)
Ignition: ON
Accelerator pedal position:
Closed throttle position

Wide open throttle or Kickdown
Table I
Column " a "

Column " b " 		Wiring,
EA/CC/ISC actuator (M16/1).
4.0 EA/CC/ISC actuator (M16/1)
Actual value potentiometer (M16/1r2) signal
Model 124, 202, 210




Model 129, 140





37
(1.37)




78
(1.37)



N4/1




N4/1






72
(2.9)




9
(2.9)
Ignition: ON
Accelerator pedal position:
Closed throttle position

Wide open throttle or Kickdown

Table II
Column " e "

Column " f " 		Wiring,
EA/CC/ISC actuator (M16/1).
5.0
EA/CC/ISC actuator (M16/1)
Voltage supply
Safety contact switch (M16/1s1) and CTP switch (M16/1/s2)
Model 124, 202, 210




Model 129, 140







37
(1.37)




78
(1.37)





N4/1




N4/1









79
(2.16)




16
(2.16)
Ignition: ON
Accelerator pedal position:
Closed throttle position 		6 - 10 V
(value jumps) 		Wiring,
EA/CC/ISC actuator (M16/1).
6.0 EA/CC/ISC actuator (M16/1)
CTP switch (M16/1s2) switching point
Model 124, 202, 210










Model 129, 140





73
(2,10)




37
(1.37)





10
(2,10)



78
(1.37)



N4/1




N4/1





N4/1




N4/1






75
(2.12)




101
(2.38)





12
(2.12)



38
(2.38)

Ignition: ON
Accelerator pedal position:
Closed throttle position

Connect second multimeter


Accelerator pedal position:
Closed throttle position


Slowly depress accelerator pedal until switching point occurs
4.7 - 5.3 V
Reference value for Table III.







Table III
Column " h "
(value jumps)


Table III
Column " i " 		Wiring,
EA/CC/ISC actuator (M16/1).
7.0 EA/CC/ISC actuator (M16/1)
Safety contact switch (M16/1s1) switching point
Model 124, 202, 210










Model 129, 140





73
(2,10)




37
(1.37)





10
(2,10)



78
(1.37)



N4/1




N4/1





N4/1




N4/1






75
(2.12)




98
(2.35)





12
(2.12)



35
(2.35)

Ignition: ON
Accelerator pedal position:
Closed throttle position

Connect second multimeter


Accelerator pedal position:
Closed throttle position


Slowly depress accelerator pedal until switching point occurs

4.7 - 5.3 V
Reference value for
Table III.







Table III
Column " k "




Table III
Column " i "
(value jumps) 		Wiring,
EA/CC/ISC actuator (M16/1).
8.0
EA/CC/ISC actuator (M16/1)
CTP switch (M16/1s2) and safety contact switch (M16/1s1)
Model 124, 202, 210




Model 129, 140






98
(2.35)





35
(2.35)




N4/1





N4/1







101
(2.38)





38
(2.38)
Ignition: ON
Accelerator pedal position:
Closed throttle position







Slowly depress accelerator by hand, until both contact switches are closed (overlap point is immeditaley after closed throttle position)


Accelerator pedal position:
Partial load or wide open throttle

Positive voltage value (value jumps)








<1 V





Negative voltage value (value jumps) 		Wiring,
EA/CC/ISC actuator (M16/1).
9.0 EA/CC/ISC actuator (M16/1)
Actuator motor (M16/1m1) resistance
Model 124, 202, 210







Model 129, 140





84
(2.21)


85
(2.22)



21
(2.21)


22
(2.22)



N4/1







N4/1










83
(2.20)


104
(2.41)



20
(2.20)


41
(2.41)
Ignition: OFF


Models 124, 202, 210
Disconnect connector 2 from EA/CC/ISC control
module (N4/1)
Accelerator pedal position:
Closed throttle position


Models 129, 140
Disconnect EA/CC/ISC control module (N4/1)

Accelerator pedal position:
Closed throttle position












<10












<10
Wirng,
EA/CC/ISC actuator (M16/1).
10.0 EA/CC/ISC actuator (M16/1)
Magnetic clutch (M16/1k1)
Model 124, 202, 210





Model 129, 140




82
(2.19)





19
(2.19)


N4/1





N4/1





103
(2.40)





40
(2.40)
Ignition: ON 7.5 - 10 V Wiring,
EA/CC/ISC actuator (M16/1),
EA/CC/ISC control module (N4/1).
11.0 CTP switch (S29/3)
Voltage supply
Model 124, 202, 210



Signal






Model 129, 140




37
(1.37)




37
(1.37)




78
(1.37)




78
(1.37)



N4/1




N4/1




N4/1




N4/1





25
(1.25)




9
(1.9)




66
(1.25)




50
(1.9)
Ignition: ON






Accelerator pedal position:
Closed throttle position

Slowly depress accelerator pedal until switching point occurs.
4.0 - 5.5 V







< 1 V



1.0 - 2.25 V 		Wiring,
CTP switch (S29/3),
11.1.
11.1   CTP switch
resistance
Model 124, 202, 210





Model 129, 140




9
(1.9)





50
(1.9)


N4/1





N4/1





25
(1.25)





66
(1.25)
Ignition: OFF
Models 124, 202, 210
Disconnect connector 1 from EA/CC/ISC control module (N4/1)



Models 129, 140
Disconnect EA/CC/ISC control module (N4/1)

Accelerator pedal position:
Closed throttle

Depress accelerator























> 20 k

900 - 1100 		Wiring,
CTP switch (S29/3).
12.0 Starter lock-out/backup lamp switch (S16/1)
Selector lever position recognition
Model 124, 202, 210










Model 129, 140






4
(1.4)




37
(1.37)





45
(1.4)




78
(1.37)




N4/1




N4/1





N4/1




N4/1







35
(1.35)




29
(1.29)





76
(1.35)




70
(1.29)
Ignition: ON



Transmission range:
P/N
R/D/3/2


Transmission range:
R
P/N/D/3/2



Transmission range:
P/N
R/D/3/2


Transmission range:
R
P/N/D/3/2





11 - 14 V
< 1 V




11 - 14 V
< 1 V





11 - 14 V
< 1 V




11 - 14 V
< 1 V 		Wiring,
Starter lock-out/backup lamp
switch (S16/1).
13.0   EA/CC/ISC control
module (N4/1)
A/C compressor signal
Model 124, 202, 210





Model 129, 140





38
(1.38)





78
(1.37)



N4/1





N4/1






16
(1.16)





57
(1.16)
Engine: Start
Closed throttle position

Set temperature selector
to MIN, blower speed to highest setting

<1 V







11 - 14 V 		Wiring,
Models 124
A/C compressor control
module (N6),
Model 202, 210
Pushbutton control module (N22)
Models 129, 140
Base module (N16/1),
DM Chassis & Drivetrain, Vol. 1 section1.1
14.0 EA/CC/ISC control
module (N4/1)
Engine RPM (TN) signal from engine control module (N3/4)
Model 124, 202, 210





Model 129, 140






37
(1.37)





78
(1.37)




N4/1





N4/1







34
(1.34)





75
(1.34)
Engine: Start
Closed throttle position
5 - 12 V 		Wiring,
Models 124, 202, 210
Engine control module (N3/4),
Models 129, 140
Base module (N16/1).
15.0

Left front axle VSS
sensor (L6/1)
Speed signal
Model 124, 202, 210



Model 129, 140




37
(1.37)




78
(1.37)


N4/1




N4/1





15
(1.15)




56
(1.15)
Lift front of vehicle.
Ignition: ON
Turn left front wheel by hand. 		> 3 V~ Wiring,
Left front axle VSS sensor (L6/1),
DM, Chassis & Drivetrain, Vol. 2, section 5.

Note:
Upon completion of test, erase DTC's stored in ASR control module (N30/1).
16.0 Left rear axle VSS
sensor (L6/3)
Speed signal
Model 129, 140




Model 202





78
(1.37)




37
(1.37)



N4/1




N4/1






53
(1.12)




12
(1.12)
Lift rear of vehicle.
Ignition: ON
Turn left rear wheel by hand. 		> 3 V~ Wiring,
Left rear axle VSS sensor (L6/3),
DM, Chassis & Drivetrain, Vol. 2, section 5.

Note:
Upon completion of test, erase DTC's stored in ASR control module (N30/1).
[16.0] Model 210


37
(1.37)
N4/1



12
(1.12)
Caution!
On model 210 set multimeter to DC voltage. 		> 3 V  
17.0 Model 124 only
Hall-effect speed sensor (B6)
Speed signal


37
(1.37)
N4/1



12
(1.12)
Ignition: ON
Roll vehicle 3 ft. (1 meter) or drive vehicle on dynamometer above 13 mph (20 km/h). 		Value jumps
0 - 12 V without consumers turned on.

0 - 9 V with consumers turned on.
Wiring,
B6
18.0 EA/CC/ISC control
module (N4/1)
Fuel safety shut-off signal to Engine control module (N3/4)
Model 124, 202, 210




Model 129, 140





38
(1.38)




78
(1.37)



N4/1




N4/1






7
(1.7)




48
(1.7)
Ignition: ON 2.0 - 11 V
(value jumps). 		Wiring,
Throttle valve actuator (M16/6),
N4/1
19.0   EA/CC/ISC control
module (N4/1)
Closed throttle position recognition signal to engine control module (N3/4)
Model 124, 202, 210




Model 129, 140







37
(1.37)




78
(1.37)





N4/1




N4/1








24
(1.24)




65
(1.24)
Ignition: ON
Accelerator pedal position:
Closed throttle position

Depress accelerator pedal



4.8 V

5.5 V 		Wiring,
N4/1
20.0 CAN data bus
Model 124, 202, 210




Model 129, 140



20
(1.20)




"L"


N4/1




N4/1x1




21
(1.21)




"H"


Ignition: OFF




Ignition: OFF
Disconnect EA/CC/ISC control module (N4/1).
Measure resistance on connector.


40-65











115-125 		Wiring,
Models 124, 202, 210
Engine control module (N3/4),
N4/1,


Models 129, 140
Engine control module (N3/4),
DM, Engines Vol. 2, section 1.1.

Table I Voltage values - Reference potentiometer (M16/1r1)

Reference voltage supply
value 		" a "
Accelerator pedal position:
Closed throttle 		" b "
Accelerator pedal position:
Wide open throttle or Kickdown
4.7 V 0.23 V 4.46 V
4.8 V 0.24 V 4.56 V
4.9 V 0.24 V 4.65 V
5.0 V 0.25 V 4.75 V
5.1 V 0.25 V 4.84 V
5.2 V 0.26 V 4.94 V
5.3 V 0.26 V 5.03 V

Table II Voltage values - Actual value potentiometer (M16/1r2)

Reference voltage supply
value 		" e "
Accelerator pedal position:
Closed throttle 		" f "
Accelerator pedal position:
Wide open throttle or Kickdown
4.7 V 4.55 V 0.23 V
4.8 V 4.65 V 0.24 V
4.9 V 4.75 V 0.24 V
5.0 V 4.85 V 0.25 V
5.1 V 4.94 V 0.25 V
5.2 V 5.04 V 0.26 V
5.3 V 5.14 V 0.26 V

Table III Voltage values - Closed throttle position switch (M16/1s2) and safety contact switch (M16/1s1)

Reference voltage supply
value 		" h "
Closed throttle position switch (closed)

Accelerator pedal position:
Closed throttle 		" i "
Closed throttle position switch (just opened)

Accelerator pedal position:
Accelerator pedal depressed to switch point 		" k "
Safety contact switch (open)

Accelerator pedal position:
Closed throttle 		" l "
Safety contact switch
(just closed)

Accelerator pedal position:
Accelerator pedal depressed to switch point
4.7 V 4.12 V 3.49 V 3.49 V 4.12 V
4.8 V 4.21 V 3.57 V 3.57 V 4.21 V
4.9 V 4.30 V 3.64 V 3.64 V 4.30 V
5.0 V 4.39 V 3.72 V 3.72 V 4.39 V
5.1 V 4.48 V 3.79 V 3.79 V 4.48 V
5.2 V 4.56 V 3.86 V 3.86 V 4.56 V
5.3 V 4.65 V 3.94 V 3.94 V 4.65 V



© 2009 Mercedes-Benz USA, LLC