MOTRONIC 1.
0 Pinout
BMW E28 535i
1 Ignition Timing Control
19 Ground
2 Closed Throttle Input
20 Fuel Pump Relay Control
3 Wide Open Throttle Input
21 Engine Speed Output
4 Start Engine Input
22 Air Inlet Temperature Input
5 Ground/Shield
23 Shields
6 Common for Air Flow Meter
24 Oxygen Sensor Input
7 Air Flow Input
25 Reference Point Sensor Input
8 Engine Speed Sensor Input
26 Reference Point Sensor Input
9 Reference Output for Air Flow Meter
27 Engine Speed Sensor Input
10 ?
28 Transmission Input
11 Fuel Rate Output
29 A/C On Input
12 ?
30 - Empty -
13 Engine Temperature Input
31 Oxygen Sensor Heater Control
14 Fuel Injector Control 1,2,3
32 - Empty -
15 Fuel Injector Control 4,5,6
33 Idle Speed Actuator
16 Ground
34 Idle Speed Actuator
17 Ground
35 (+) Ignition Power Input
18 (+) Continuous Power Input
Motronic 1.0 connector pin diagram
E28 535i Motronic connector in glovebox, disconnected from control unit
Details (E28 535i)
Conventional current flow is observed
1 Ignition Timing Control BK
-Comes from (S105)
ECU function: Controls primary ignition coil by switching the ground side of its
circuit
ETM 1360-1
2 Closed Throttle Input BR/BU
-Goes to (LL) of throttle switch
ETM 1360-1
3 Wide Open Throttle Input BR/BK
-Goes to (VL) of throttle switch
ETM 1360-1
4 Start Engine Input BK/YL
ETM 1240-0
5 Ground/Shield BR
-Goes to (G102)
-Grounds shield of reference point sensor wires
ETM
6 Common for Air Flow Meter GY/BU
-Comes from pin (4) of air flow meter connector
ETM 1360-7
7 Air Flow Input GY/YL
-Comes from pin (2) of air flow meter connector
ETM 1360-7
8 Engine Speed Sensor Input YL
-Comes from engine speed sensor connector (black connector)
ETM 1360-1, 1360-7
9 Reference Output for Air Flow Meter GY/WT
-Comes from pin (3) of air flow meter connector
ETM 1360-7
10 STANDARD BR BR/GN
AUTO
Standard: Connected to socket (17) via (C131) and is ultimately grounded to
(G102)
Automatic: Goes to socket (2) of (C238) and ultimately pin (ME) of
transmission control unit connector (socket (24) of connector)
ETM 1360-1, 2460-3
11 Fuel Rate Output WT
-Goes to pin (3) of (C103) and ultimately socket (2) of (C1) which plugs into
pin (KL11) of the instrument cluster circuit board
ETM 6210-0, 6210-4, 6581-1, 6581-2
12 ? WT/GR
-Goes to socket (5) of diagnostic connector
ETM 1360-1
13 Engine Temperature Input BR/RD
ETM 1360-1
14 Fuel Injector Control 1,2,3 BR/WT
-Comes from (S109)
-Controls injectors 1, 2 and 3 by switching the ground side of their circuits (all
three at the same time)
ETM 1360-5
15 Fuel Injector Control 4,5,6 BR/YL
-Comes from (S106)
-Controls injectors 4, 5, and 6 by switching the ground side of their circuits
(all three at the same time)
ETM 1360-5
16 Ground BR
Goes to (G102)
ETM 1360-1
17 Ground BR
-Goes to (G102)
-Is connected to socket (10) via (C131)
ETM 1360-1
18 (+) Continuous Power Input RD
-Comes from socket of pin (30) of main relay
-Hot at all times
ETM 1360-4
19 Ground BR
-Goes to (G102)
ETM 1360-1
20 Fuel Pump Relay Control BR/GN
-
ETM 1250-0
21 Engine Speed Output BK/BU
-Goes to socket (1) of (C103) and ultimately to socket (8) of (C1) which plugs
to pin (TD) of instrument cluster circuit board
ETM 6210-4
22 Air Inlet Temperature Input GY/VI
-Comes from pin (1) of air flow meter connector
ETM 1360-7
23 Shields N/A
-Shield for oxygen sensor and engine speed sensor wires
ETM 1360-7
24 Oxygen Sensor Input GN
-Comes from (C141) of oxygen sensor
ETM 1360-7
25 Reference Point Sensor Input YL
-Comes from reference point sensor connector (gray connector)
ETM 1360-1, 1360-7
26 Reference Point Sensor Input BK
-Comes from reference point sensor connector (gray connector)
ETM 1360-1, 1360-7
27 Engine Speed Sensor Input BK
-Comes from engine speed sensor connector (black connector)
ETM 1360-1, 1360-7
28 Transmission Input BR/BK
Standard: Goes to socket (1) of (C132) and ultimately is grounded to (G102)
Automatic: goes to socket (6) of (C238) and ultimately pin (2) of (C1) to the
transmission range switch
ETM 1350-1, 1360-0, 1360-1
29 A/C On Input BU/BK
-Comes from A/C compressor clutch
ETM 1360-1, 6411-0, 6454-0
30 - Empty -
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
31 Oxygen Sensor Heater Control GY/BR
-Comes from socket of pin (85) of oxygen sensor relay
ETM 1250-0
32 - Empty -
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
33 Idle Speed Actuator WT/YL
-Comes from (5) of idle speed actuator
-Extend control
ETM 1360-7
34 Idle Speed Actuator BK/GN
-Comes from (3) of idle speed actuator
-Retract control
ETM 1360-7
35 (+) Ignition Power Input RD/BU
-Comes from socket of pin (87) of main relay
-Hot in 'RUN' or 'START'
ETM
This is an unfinished doucment.
