SPECIALIZED
ECU REPAIR
www.ecudoctors.com
Page 1 of 2
*This 35 Pin Assignment sheet
will help you identify the correct
pin location and signals necesary
for the right function of your DME.
1-800-328-1425
WWW.ECUDOCTORS.COM
941 NE 48TH ST.
OAKLAND PARK, FL 33334
Diagnose Follow-up Procedures
*DME Harness Pin Assignment*
Pin Signal SignalComponent / Function
1
2
3
4
5
6
7
8
9
12
13
14
15
16
17
18
19
10
11
20
21
30
31
32
33
34
35
output
output
output
output
output
output
output
output
output
output
output
input
input
input
input
input
input
input
input
input
input
input
input
input
22
23
24
25
26
27
28
29
Ignition Coil
Idle switch
Full Throttle switch
Starter terminal 50
Ground
Volume Air flow sensor
Volume Air flow sensor
Crankshaft speed (rpm) sensor
Volume Air flow sensor
Test connector A
Cylinder head temperature sensor
Injection time signal
Injection time signal
Ground
Ground
DME main/fuel pump relay terminal 87
Ground
Bridge to ground (California cars only)
Tachometer/up-shift indicator
DME relay terminal 85b
Tachometer/up-shift indicator
Vacant
Vacant
Vacant
Idle speed control valve
Idle speed control valve
Main/fuel pump relay terminal 87
Volume Air flow sensor (terminal 1)
Oxygen sensor wire shield
Oxygen sensor
Reference sensor
Reference sensor
Crankshaft speed (rpm) sensor
High altitude switch
Air conditioner on/off
Primary signal, ignition coil
Ground while throttle closed
Ground while throttle fully open
Battery voltage (+) during cranking
Shielding for reference sensor
Intake Air Temperature (IAT) sensor signal
Air flow sensor Potentiometer
Crankshaft speed sensor (-)
Reference signal (5 volts) to Volume Air flow sensor
Terminal A in test connector
Reference signal (5 volts) to cylinder head temperature
Ground pulse with engine running (Injectors 1,2 and 3)
Ground pulse with engine running (Injectors 4,5 and 6)
DME ground to intake manifold runner
DME ground to intake manifold runner
Battery voltage (+) from main/fuel pump relay to ECM
DME ground connection on # 1 intake manifold runner
DME ground to intake manifold runner
Terminal 1up-shift indicator light
Ground signal to terminal 85b of main/fuel pump relay
Up-shift indicator light (term 2), where applicable
Open
Open
Open
Idle speed control valve(open signal)
Idle speed control valve(Closed signal)
Battery voltage (+) from terminal 87 main/fuel pump relay
Variable voltage signal (0-5 volts) when vane door moves
Shielded ground for oxygen sensor and speed sensor
Variable voltage signal with engine running (0-1 volt)
Reference sensor (-)
Reference sensor (+), voltage signal (variable) with engine
Crankshaft speed sensor (+), voltage variable with engine
Ground signal from altitude switch when switch is closed
A/C temperature switch
1
19
18
35
*It is the sole responsability of the user
to perform these tests. Please inform
yourself on how to operate your testing
equipment before attempting any
diagnostics. Not following these guide-
lines will result in damages to your
sensors, harness or DME on your car.
SPECIALIZED
ECU REPAIR
www.ecudoctors.com
Page 2 of 2
1-800-328-1425
WWW.ECUDOCTORS.COM
941 NE 48TH ST.
OAKLAND PARK, FL 33334
Diagnose Follow-up Procedures
*DME Harness Electrical Tests*
Component or Circuit Test Terminals Correct Test ValueTest Conditions
Voltage supply to ECM
Main Grounds
Fuel pump relay control
Ignition coil
Starter input (terminal 50)
Full Throttle switch
Idle switch
Idle speed control valve
Tachometer/up-shift light
Crankshaft speed (rpm) sensor
Reference (TDC) sensor
Cylinder head temperature
sensor
Fuel Injector control
(Injectors 4,5 and 6)
Volume Air flow sensor
Volume Air flow sensor
High altitude switch
Oxygen sensor
Air conditioner ON Signal
Fuel Injector control
(Injectors 1,2 and 3)
Air temperature sensor
Ignition ON
Ignition OFF
Ignition ON
Actuate Starter
Key in Start Position
Throttle closed or
opened partially.
Throttle fully open
Ignition OFF
Ignition OFF
Ignition OFF
Ignition OFF
Ignition OFF
Ignition ON
Move sensor vane by
hand or actuate starter
Ignition ON
Ignition OFF
Connect green oxygen
sensor wire to ground
Ignition ON A/C switch ON
Ignition ON
Ignition OFF
Throttle closed
Open throttle 1mm
Battery Voltage
(approximately 12 volts)
Continuity
Fuel pump runs (audibly) when
terminal 20 is touched to ground
8 volts minimum
Pulse voltage signal
No continuity
Continuity
40 Ω
Continuity
0.6 to 1.6 kΩ
0.6 to 1.6 kΩ
Resistance varies with temp.:
0°C (32°F):4.4 – 6.8 kΩ
15° - 30°C (60° - 85°F):1.4 – 3.6 kΩ
40°C (105°F):1.0 – 1.3 kΩ
80°C (175°F):250 – 390 Ω
100°C (212°F):160 – 210 Ω
130°C (265°F):90 Ω
Fuel injectors must click when
terminal 15 is touched to ground
Resistance must fluctuate
Variable voltage signal (0-5 volts)
Continuity
Continuity
Battery voltage
Fuel injectors must click when
terminal 14 is touched to ground
Resistance varies with temp.:
20°C (68°F) 2000-3000 ohms
80°C (176°F) 250-400 ohms
No continuity
Continuity
18 and Ground
35 and Ground
5 and Ground
10 and Ground
16 and Ground
17 and Ground
19 and Ground
20 and Ground
1 and Ground
4 and Ground
3 and Ground
3 and Ground
2 and Ground
34 and 33
11 and 21
8 and 27
25 and 26
13 and Ground
15 and Ground
7 and 9
22 and Ground
28 and Ground
24 and Ground
29 and Ground
14 and Ground
6 and 22
Tools Needed
•Digital Multimeter: capable of measuring
VDC - OHM - Diode Continuity