For 1990-2009 cars

Table 1: | Engine Control Module (ECM) C1
Table 2: | Engine Control Module (ECM) C2

### Engine Control Module (ECM) C1

Pin | Wire | Circuit | Function
--- | --- | --- | ---
1 | TN | 407 | KS Low Reference Bank 2
2 | OG | 5280 | Heated Oxygen Sensor Input Pump Current Bank 2 Sensor (1)
3 | L-GN | 5278 | Heated Oxygen Sensor Input Pump Current Bank 1 Sensor (1)
4 | OG | 5275 | Camshaft Position Intake Sensor (1)
5 | GY | 605 | Reference Voltage Feed - 5-Volt Reference
6 | YE | 7017 | Variable Intake Manifold Position Signal
7 | TN | 470 | Low Reference
8 | PU | 486 | Throttle Position Sensor Signal 2
9 | D-GN/WH | 2124 | Electronic Spark Timing Signal Cylinder 4
10 | WH/BK | 5039 | Engine Speed Sensor High
11 | -- | -- | Not Used
12 | OG/BK | 5272 | Camshaft Phaser Intake Solenoid (2)
13 | L-GN | 5282 | Camshaft Phaser Exhaust Solenoid (1)
14 | -- | -- | Not Used
15 | BN | 582 | Throttle Motor Feed - Close
16 | GY/WH | 3113 | Heated Oxygen Sensor Heater Low Control Bank 1 Sensor (1)
17 | GY | 1716 | Knock Sensor Return
18 | TN | 1657 | HO2S Low Reference Bank 1 Sensor 1
19 | PU | 1665 | Oxygen Sensor Signal - Right - Forward of Catalytic Converter
20 | D-GN | 5273 | Camshaft Position Exhaust Sensor (1)
21 | GY | 23 | Alternator Field Duty Cycle Signal
22 | -- | -- | Not Used
23 | YE | 410 | Coolant Temperature Sensor Signal
24 | -- | -- | Not Used
25 | L-BU/WH | 2126 | Electronic Spark Timing Signal Cylinder 6
26 | OG/WH | 2122 | Electronic Spark Timing Signal Cylinder 2
27-28 | -- | -- | Not Used
29 | PU | 5284 | Camshaft Phaser Intake Solenoid (1)
30 | WH/BK | 5283 | Camshaft Phaser Exhaust Solenoid (2)
31 | YE | 581 | Throttle Motor Feed - Open
32 | L-BU | 3212 | Heated Oxygen Sensor Heater Low Control Bank 2 Sensor (1)
33 | D-BU | 496 | Knock Sensor Signal 1
34 | PU | 1666 | Oxygen Sensor Signal - Left - Forward of Catalytic Converter
35 | WH | 5279 | Heated Oxygen Sensor Pump Current Bank 1 Sensor (1)
36 | PU | 5274 | Camshaft Position Exhaust Sensor (2)
37-38 | -- | -- | Not Used
39 | TN | 2752 | Sensor Return - Throttle Position Sensor
40 | TN/BK | 231 | Oil Pressure Switch Signal
41 | D-GN | 2125 | Electronic Spark Timing Signal Cylinder 5
42 | PU | 2121 | Electronic Spark Timing Signal Cylinder 1
43 | OG | 225 | Alternator Output - Regulator Reference Voltage
44 | L-BU/BK | 5041 | Intake Manifold Control (1)
45 | L-BU/BK | 844 | Fuel Injector 4 Output
46 | PK/BK | 1746 | Fuel Injector 3 Output
47 | TN/WH | 845 | Fuel Injector 5 Output
48 | D-GN/WH | 428 | Canister Purge Solenoid Output
49 | GY/BK | 1798 | Return
50 | L-BU | 1876 | Knock Sensor Signal 2
51 | PU/WH | 5281 | Heated Oxygen Sensor Pump Current Bank 2 Sensor (1)
52 | TN | 1664 | Oxygen Sensor Return - Right - Forward of Catalytic Converter
53 | YE | 5276 | Camshaft Position Intake Sensor (2)
54 | GY | 2701 | Reference Voltage Feed - 5-Volt Ref - Throttle Position Sensor
55 | D-GN | 485 | Throttle Position Sensor Signal 1
56 | L-GN | 432 | BARO Sensor Signal
57 | GY | 705 | Reference Voltage Feed - 5-Volt Reference
58 | L-BU | 2123 | Electronic Spark Timing Signal Cylinder 3
59 | PU/WH | 5024 | Engine Speed Sensor Low
60-61 | -- | -- | Not Used
62 | L-GN/BK | 1745 | Fuel Injector 2 Output
63 | TN | 1744 | Fuel Injector 1 Output
64 | YE/BK | 846 | Fuel Injector 6 Output

### Engine Control Module (ECM) C2

Pin | Wire | Circuit | Function
--- | --- | --- | ---
1 | PK/BK | 5290 | Engine Main Relay Fused Control (1)
2 | BK/WH | 3122 | Oxygen Sensor Heater Control Low - Front
3 | PK | 239 | Run/Crank Ignition 1 Voltage
4 | D-BU | 473 | High Speed Cooling Fan Relay Control
5-6 | -- | -- | Not Used
7 | WH/BK | 1164 | Electronic Throttle - Pedal Position 5-Volt Ref 1
8 | PU | 1272 | Electronic Throttle - Pedal Position 2
9 | OG/BK | 380 | Air Conditioning Refrigerant Pressure Sensor Signal
10 | WH | 17 | Stop Lamp Switch Signal
11 | TN | 472 | Manifold Absolute Temperature Sensor Signal
12 | D-GN | 890 | Fuel Tank Pressure Sensor Signal
13-16 | -- | -- | Not Used
17 | PK/BK | 5290 | Engine Main Relay Fused Control (1)
18 | OG/WH | 3223 | Oxygen Sensor Signal - Bank 2 Sensor 2 Heater Control Low
19 | D-GN/WH | 465 | Fuel Pump Primary Relay Control
20 | D-GN | 335 | Low Speed Cooling Fan Relay Control
21 | -- | -- | Not Used
22 | BN | 818 | Vehicle Speed Signal
23 | TN/BK | 2500 | High Speed Serial Data (+) (1)
24 | BN | 5069 | Engine Main Relay Coil Control
25 | BK | 452 | Sensor Return
26 | TN | 2760 | Sensor Return - Induction Air Temperature
27 | L-BU | 1937 | Fuel Gage Sensor Signal - Right
28 | -- | -- | Not Used
29 | PU/WH | 1668 | Heated Oxygen Sensor High Signal Bank 1 Sensor (2)
30-31 | -- | -- | Not Used
32 | OG/BK | 1786 | Transmission Park/Neutral Signal
33 | WH | 1310 | Canister Purge Solenoid Output
34 | -- | -- | Not Used
35 | YE | 447 | Starter Relay Coil Control
36 | RD/WH | 1440 | Battery Positive Voltage
37-38 | -- | -- | Not Used
39 | GY | 596 | Reference Voltage Feed - 5-Volt Reference
40 | BN | 1271 | Electronic Throttle - Pedal Position Return 1
41 | TN | 1671 | Heated Oxygen Sensor Low Signal Bank 2 Sensor (2)
42 | D-BU | 1936 | Fuel Gage Sensor Signal - Left
43 | YE | 492 | Mass Air Flow Signal
44 | L-BU | 1162 | Electronic Throttle - Pedal Position Signal 2
45-48 | -- | -- | Not Used
49 | D-GN/WH | 459 | A/C Compressor Clutch Relay Control
50 | BN/WH | 419 | Check Engine Indicator Lamp Output
51-54 | -- | -- | Not Used
55 | TN | 2501 | High Speed GMLAN Serial Data (-) (1)
56 | TN | 1274 | Electronic Throttle - Pedal Position 5-Volt Ref 2
57 | TN/WH | 1669 | HO2S Signal Bank 2 Sensor 2
58 | YE/BK | 5728 | ECM/TCM Serial Data Wake Up
59 | -- | -- | Not Used
60 | D-BU | 1161 | Electronic Throttle - Pedal Position Signal 1
61 | PU | 1670 | Heated Oxygen Sensor High Signal Bank 2 Sensor (2)
62-64 | -- | -- | Not Used