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Diagnostic Manual, Engines, Volume 4

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9.6 ME - SFI (ME1.0) > 25 Electrical Test Program - Electronic Accelerator (EA) Test

Electrical Test Program - Electronic Accelerator (EA) Test

WARNING!
Risk of severe injury when touching ignition parts which produce high voltages. Do not touch ignition components.
Persons with heart pacemakers are not to perform repairs on this type of ignition system.

WARNING!
Risk of fatal injury from being pulled into rotating vehicle parts.
Do not reach into rotating parts.
Wear closed and tight-fitting work clothes.
Protect vicinity of rotating vehicle components from unauthorized access.

WARNING!
Risk of explosion from fuel igniting, risk of poisoning from inhaling and swallowing fuel as well as risk of injury to eyes and skin from contact with fuel.
No fire, sparks, exposed flames or smoking.
Pour fuels only into suitable and appropriately marked containers.
Wear protective clothing when handling fuel.

Note regarding "Test Connection" column:
The numbers indicated in parentheses, for example,

1.0 (2A) signify:
2 = Socket 2 on wiring diagram.
A = Connector A on wiring diagram

Connect interior harness connector to connection 1 on test cable.
Connect engine harness connector to connection 2 on test cable.

Preparation for Test:
1. Review section 0,
2. Review

11 ,

21 ,

22 ,
3. Ignition: OFF,
4. Connect test cable with socket box to N3/11 or N3/12, see

22 .

Test scope Test connection

Test condition Nominal value Possible cause/Remedy

1.0 P 1 5 8 7
P 0 5 6 0 Left engine control
module (N3/11) or
Right engine control module (N3/12)
Voltage supply
Circuit 30

26
(1.26)
N3/11
N3/12

35
(1.35)

Ignition: ON 11 - 14 V 1.1

1.1 Ground wire

26
(1.26)

39
(1.39)

N3/11
N3/12

X11/4
2

2

Ignition: ON 11 - 14 V Wiring,
Model 129:
Ground (W27), module box
bracket.
Model 140:
Harness ground (W15), right
footwell.
1.2

1.2 Voltage supply
Circuit 30

X11/4
1

N3/11
N3/12

35
(1.35)

Ignition: ON 11 - 14 V Wiring,
Base module (N16/1) or fuse on base module,

2.0 P 1 5 8 7
P 0 5 6 0 Left engine control
module (N3/11) or
Right engine control module (N3/12)
Voltage supply
Circuit 87L

38
(1.38)
N3/11
N3/12

24
(1.24)

Ignition: ON 11 - 14 V 2.1

2.1 Electronic ground

38
(1.38)
N3/11
N3/12

X11/4
2

Ignition: ON 11 - 14 V Wiring,
Model 129, 140:
Electronics ground (W15), right
footwell.
2.2

2.2 Voltage supply
Circuit 87L

X11/4
1

N3/11
N3/12

24
(1.24)

Ignition: ON

Ignition: OFF 11 - 14 V

<1 V Wiring,
Base module (N16/1) or fuse on base module,
Ignition/starter switch (S2/1).

3.0 P 1 5 8 7
P 0 5 6 0 Left engine control
module (N3/11) or
Right engine control
module (N3/12)
Voltage supply
Circuit 87M1e

39
(1.39)
N3/11
N3/12

36
(1.36)

Ignition: ON

Ignition: OFF 11 - 14 V

<1 V Wiring.

4.0 P 1 5 4 2
P 0 5 0 7 Only RIGHT engine control
module (N3/12)

Pedal value sensor (B37)
Signal
Nominal value
potentiometer 1

18
(1.18)
N3/12

19
(1.19)

Ignition: ON
Accelerator pedal
position:
CTP:
WOT:

0.2 - 0.5 V
4.3 - 4.8 V Wiring,
4.1 ,
B37

4.1 Voltage supply
Nominal value
potentiometer 1

18
(1.18)
N3/12

17
(1.17)

Ignition: ON 4.75 - 5.25 V N3/12

5.0 P 1 5 4 2
P 0 5 0 7 Only LEFT engine control
module (N3/11)

Pedal value sensor (B37)
Signal
Nominal value
potentiometer 2

18
(1.18)
N3/11

19
(1.19)

Ignition: ON
Accelerator pedal
position:
CTP:
WOT:

0.1 - 0.4 V
2.1 - 2.5 V Wiring,
5.1 ,
B37

5.1 Voltage supply
Nominal value
potentiometer 2

18
(1.18)
N3/11

4
(1.4)

Ignition: ON 2.25 - 2.75 V N3/11

6.0 P 0 5 0 7
P 0 1 2 0
P 1 1 6 2
P 1 1 8 6 Right EA/CC/ISC
actuator (M16/3) or
Left EA/CC/ISC
actuator (M16/4)
Signal
Actual value potentiometer 1

Actual value potentiometer 2

98
(2.98)

98
(2.98)

N3/11
N3/12

N3/11
N3/12

97
(2.97)

107
(2.107)
Ignition: ON

Accelerator pedal
position:
CTP:
WOT:

Accelerator pedal
position:
CTP:
WOT:

4.0 - 4.6 V
< CTP value

0.3 - 0.9 V
> CTP value
Wiring,
6.1 ,
M16/4 or M16/3

6.1 Voltage supply
Actual value
potentiometers 1 and 2

98
(2.98)
N3/11
N3/12

106
(2.106)

Ignition: ON 4.75 - 5.25 V N3/11 or N3/12

7.0 P 1 1 8 6
P 1 5 8 0
P 1 5 8 1 Right EA/CC/ISC
actuator (M16/3) or
Left EA/CC/ISC
actuator (M16/4)
Activation of actuator motor

74
(2.74)

N3/11
N3/12

75
(2.75)

Ignition: ON
Engine: at Idle

ECT > 70 °C 1.0 - 2.3 V
1.0 - 2.5 V
Value oscillates. Wiring,
M16/3 or M16/4.
N3/11 or N3/12

Resistance of actuator motor

74
(2.74)
N3/11
N3/12

75
(2.75

Ignition: OFF < 10

8.0 P 0 5 0 0 Only right engine control
module (N3/12) (up to 05/98) (as of 06/98 via CAN)

Left front axle VSS
sensor (L6/1)

38
(1.38)
N3/12

9
(1.9)

Raise front of vehicle.
Ignition: ON
Spin left front wheel by
hand.

4 - 8 V ~ Wiring,
ESP see DM, Chassis &
Drivetrain, Vol. 3, section 9 (ASR,
ETS, ESP)

9.0 P 0 5 0 0 Only right engine control
module (N3/12) (up to 05/98) (as of 06/98 via CAN)

Left rear axle VSS
sensor (L6/3)

38
(1.38)
N3/12

22
(1.22)

Raise rear of vehicle.
Ignition: ON
Spin left rear wheel by
hand.

4 - 8 V ~ Wiring,
ESP see DM, Chassis &
Drivetrain, Vol. 3, section 9 (ASR,
ETS, ESP)

10.0 P 0 5 0 7
P 1 6 4 1 CTP (idle) signal

38
(1.38)

N3/11
N3/12

16
(1.16)

Ignition: ON

Accelerator pedal
position:
CTP:
WOT:

> 4.0 V
2.0 - 3.0 V Wiring,
N3/11 or N3/12

11.0 Only on RIGHT engine
control module (N3/12)
(up to 05/96) (as of 06/96 via CAN)

A/C compressor signal

38
(1.38)

N3/12

8
(1.8)

Engine: at Idle

Turn A/C system ON,
move temperature
selector wheel to MIN,
blower set to AUTO.
< 1.0 V

11 - 14 V Wiring,
A/C pushbutton control
module (N22).

12.0 Only on RIGHT engine control
module (N3/12) (up to 05/96)

EPC MIL (A1e43)
Activation

21
(1.21)
N3/12

35
(1.35)

Ignition: ON

Engine: at Idle 11 - 14 V

< 1.0 V Wiring,
Malfunction in actuators or pedal
value sensor,
N3/12

13.0 Only on LEFT engine control module
(N3/11)

Coding

45
(1.45)

N3/11

25
(1.25)

Ignition: ON
11 - 14 V Wiring.

14.0 Ground bridge

73
(2.73)
N3/11
N3/12

96
(2.96)

Ignition: OFF < 1 Wiring.

15.0 P 0 6 0 0
P 1 5 7 0
P 1 5 8 8
P 1 6 4 1
P 1 7 4 7
CAN data bus

60
(1.60)
N3/11
N3/12

61
(1.61)

Ignition: OFF
Disconnect connector 1
from test cable and test
directly at connector 1 of
engine wiring harness
using an ohmmeter,
See 22
75 - 85 15.1 ,
15.2 ,
Data line.

15.1 Model 129/140 up to 05/96
CAN element in RCL
control module (N54)
Resistance

Model 129/140 as of 06/96
CAN element in DAS
control module (N54/1)
Resistance

L

N54
N54/1

H

Ignition: OFF
Disconnect control
module (N54 or N54/1)
and test directly at
control module.
115 - 125 N54 or N54/1

15.2 CAN element in engine
control module (N3/11 or N3/12)
Resistance

60

N3/11
N3/12

61

Ignition: OFF
Disconnect connector 1
from control module
(N3/11 or N3/12) and
test directly at control
module.
235 - 245 N3/11 or N3/12