For 1990-2009 cars

Connector 1: | ECM X1
Connector 2: | ECM X2

### ECM X1

#### Connector Part Information

- OEM: BOSCH 1928403454
- Service: N/A
- Description: 81-way F ECU 81P Assembly Seal

#### ECM X1

Pin | Wire Color | Circuit No. | Function
--- | --- | --- | ---
1 | BK | -- | Ground
2 | BK | -- | Ground
3 | -- | -- | Not Used
4 | PK/BK | -- | Engine Main Relay Fused Control (1)
5-12 | -- | -- | Not Used
13 | OG/BK | -- | Trans Park/Neutral Signal (1)
14-15 | -- | -- | Not Used
16 | D-BI | -- | APM Signal (1)
17 | -- | -- | Stop Lamp Supply Voltage
18 | RD/WH | -- | Battery Positive Voltage
19 | BN | -- | APM 5-Volt Reference (2)
20 | GY | -- | F/Pump Pressure Sensor 5-Volt Reference
21 | WH/BK | -- | APM 5-Volt Reference (1)
22 | -- | -- | Not Used
23 | D-GN/WH | -- | A/C Comp Clutch Supply Voltage
24 | D-BU | -- | High Speed Cooling Fan Relay Control
25-29 | -- | -- | Not Used
30 | BN/BK | -- | High Speed GMLAN Serial Data (+) 1
31 | -- | -- | Not Used
32 | BN | -- | Charge Indicator Control
33 | D-BU | -- | Backup Lamp Relay Control
34 | -- | -- | Not Used
35 | L-BU | -- | Secondary Fuel Level Sensor Signal
36 | D-BU | -- | Primary Fuel Level Sensor Signal
37 | -- | -- | Not Used
38 | PU | -- | Engine/Radio Serial Data K-Line
39 | PK | -- | Run/Crank Ignition 1 Voltage
40 | BN | -- | Engine Main Relay Coil Control
41-42 | -- | -- | Not Used
43 | D-GN | -- | Low Speed Cooling Fan Relay Control
44-48 | -- | -- | Not Used
49 | BN | -- | High Speed GMLAN Serial Data (1) 1
50 | -- | -- | Not Usd
51 | D-GN/WH | -- | Fuel Pump Primary Relay Control
52-53 | -- | -- | Not Used
54 | L-BU | -- | APM Signal (2)
55 | OG/BK | -- | A/C Refrigerant Press Sensor Signal
56-62 | -- | -- | Not Used
63 | WH | -- | EVAP Canister Vent Solenoid Control
64-66 | -- | -- | Not Used
67 | BK | -- | Ground
68 | BK | -- | Ground
69 | -- | -- | Not Used
70 | GY | -- | Generator Field Duty Cyclinder Signal
71 | -- | -- | Not Used
72 | BN/WH | -- | Cruise Control Clutch Pedal Pstn S/W Signal
73 | D-BU | -- | Accessory Wakeup Serial Data
74 | D-GN | -- | F/Pump Pressure Sensor Signal
75 | -- | -- | Not Used
76 | BN/WH | -- | Fuel Level Sensor Low Reference
77 | BK/WH | -- | Signal Ground
78 | PU | -- | APM Low Reference (2)
79 | BN | -- | APM Low Reference (1)
80 | -- | -- | Not Used
81 | YE | -- | Starter Relay Coil Control

### ECM X2

#### Connector Part Information

- OEM: BOSCH 1928403462
- Service: N/A
- Description: 40-way F ECU 40P Assembly Seal

#### ECM X2

Pin | Wire Color | Circuit No. | Function
--- | --- | --- | ---
82 | -- | -- | Not Used
83 | L-GN/BK | -- | Fuel Injector Control (2)
84 | BN/WH | -- | Heated O2 Sensor Low Signal Bank 1 Sensor (1)
85 | BK | -- | Ground
86 | OG/BK | -- | Manifold Absolute Pressure Low Reference
87 | BN | -- | Sensor Low Reference
88 | BK/WH | -- | Camshaft Position Sensor Low Reference
89 | BN | -- | Sensor Low Reference
90 | -- | -- | Not Used
91 | L-BU | -- | Fuel Injector Control (4)
92 | L-BU | -- | Heated O2 Sensor Control Sensor 2
93 | GY | -- | 5-Volt Reference
94 | GY | -- | 5-Volt Reference
95 | D-BU/WH | -- | Crankshaft POS Sensor Signal (3)
96 | YE/BK | -- | Crankshaft POS Sensor Low Reference (3)
97 | D-BU | -- | Knock Sensor Signal (1)
98 | -- | -- | Not Used
99 | BN/WH | -- | Fuel Injector Control (3)
100 | L-GN | -- | Manifold Absolute Pressure Sensor Signal
101 | D-GN/WH | -- | Oil Temperature Sensor Signal
102 | PU/WH | -- | Heated O2 Sensor High Signal Bank 1 Sensor (2)
103 | PU/WH | -- | Heated O2 Sensor High Signal Bank 1 Sensor (1)
104 | D-GN | -- | High Idle Switch Control
105 | BN | -- | Oil Pressure Gage Signal
106 | D-GN/WH | -- | EVAP Canister Purge Solenoid Control
107 | BN | -- | Fuel Injector Control (1)
108 | BN | -- | Intake Air Temperature Sensor Signal
109 | YE | -- | Engine Coolant Temperature Sensor Signal
110 | GY | -- | Exhaust Gas Recir Vacuum Regulator Valve Signal
111 | BN | -- | Oil Level Switch Signal
112 | D-BU | -- | Throttle POS Sensor Signal (5)
113 | BN/WH | -- | Camshaft Position Sensor Signal
114 | D-BU | -- | Idle Speed Control Motor Control Retract
115 | -- | -- | Not Used
116 | L-BU | -- | Ignition Coil 1 and 4 Control
117 | D-GN | -- | Heated O2 Sensor Control Sensor 1
118 | GY | -- | Exhaust Gas Recirculation Solenoid Control
119 | L-BU | -- | Idle Speed Control Motor Control Extend
120 | -- | -- | Not Used
121 | D-GN/WH | -- | Ignition Coil 2 and 3 Control