2004 Saturn Ion Red LineFACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM) Connector End Views

WARNING: This page is about a different car, the 2004 Saturn Ion 3, 2004 Saturn Ion 2, and 2004 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.
Engine Control Module (ECM) C1 Connector End View

GM877914Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 15336786
  • 28 Way F Bosch (BK)
Pin Wire Color Circuit No. Function
1 - - Not Used
2 GY 705 5 Volt Reference
3 D-GN 890 Fuel Tank Pressure Sensor Signal
4 PU 420 Stop Lamp Switch Signal
5 GY 1884 Cruise Control Set/Coast and Resume/Accelerate Switch Signal (K34)
6 - - Not Used
7 PU 1589 Fuel Level Sensor Signal
8 BN 4 Accessory Voltage
9 - - Not Used
10 BK 2759 Low Reference
11 L-BU 20 Stop Lamp Switch Signal
12 PU 1807 ECM Class 2 Serial Data
13 TN/WH 2500 High Speed GM LAN Serial Data Bus (+)
14-15 - - Not Used
16 BN/WH 419 MIL Control
17 WH 1310 EVAP Canister Vent Solenoid Control
18 PU 1807 ECM Class 2 Serial Data (JM4)
19 TN 2501 High Speed GM LAN Serial Data Bus (-)
20 - - Not Used
21 D-GN/WH 459 A/C Compressor Clutch Relay Control (C60)
22 OG 480 Battery Positive Voltage
23 PK 639 Ignition 1 Voltage
24 - - Not Used
25 D-GN/WH 465 Fuel Pump Relay Control
26 L-GN 1887 Cruise Control Servo Move Direction Signal (K34)
27 L-BU 1888 Cruise Control Servo Clutch Control (K34)
28 PK 1886 Cruise Control Servo Move Signal (K34)
Engine Control Module (ECM) C2 Connector End View

GM877912Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 15336796
  • 80 Way F 101/ Bosch (BK)
Pin Wire Color Circuit No. Function
1 TN 2501 High Speed GM LAN Serial Data Bus (-)
2 - - Not Used
3 L-GN 432 MAP Sensor Signal
4 D-BU 417 TP Sensor Signal
5 - - Not Used
6 RD/BK 380 A/C Refrigerant Pressure Sensor Signal (C60)
7 YE 410 ECT Sensor Signal
8 - - Not Used
9 PU 574 Low Reference
10 YE 573 CKP Sensor Signal
11 D-BU 496 Knock Sensor Signal
12 PU 1666 HO2S High Signal Sensor 1
13 PU/WH 1668 HO2S High Signal Sensor 2
14-16 - - Not Used
17 BN/WH 633 CMP Sensor Signal
18-21 - - Not Used
22 TN/WH 2500 High Speed GM LAN Serial Data Bus (+)
23 - - Not Used
24 OG/BK 469 Low Reference
25 BK 2752 Low Reference
26 - - Not Used
27 BK 2751 Low Reference (C60)
28 BK 2761 Low Reference
29-30 - - Not Used
31 GY 1716 Low Reference
32 - - Not Used
33 TN 1667 HO2S Low Signal Sensor 1
34 TN/WH 1669 HO2S Low Signal Sensor 2
35-36 - - Not Used
37 TN/BK 231 Oil Pressure Switch Signal
38 GY 23 Generator Field Duty Cycle Signal
39-42 - - Not Used
43 GY 2704 5 Volt Reference
44 GY 2701 5 Volt Reference
45 - - Not Used
46 GY 2700 5 Volt Reference (C60)
47 TN 472 IAT Sensor Signal
48 D-GN 1433 PNP/Clutch Start Switch Signal
49 - - Not Used
50 PU 401 VSS Signal Low (M86)
51 - - Not Used
52 L-BU/BK 1748 IAC Coil A Low Control
53-54 - - Not Used
55 BK/WH 1423 HO2S Heater Low Control Sensor 2
56 BK 1744 Fuel Injector 1 Control
57 L-GN/BK 1745 Fuel Injector 2 Control
58-60 - - Not Used
61 WH 423 IC Timing Control
62 RD 225 Generator Turn On Signal
63 OG 406 IC Timing Control
64-65 - - Not Used
66 YE 447 Starter Relay Coil Control
67 D-GN 335 Cooling Fan Relay Control
68 - - Not Used
69 BK 2760 Low Reference
70 YE 400 VSS Signal High (M86)
71 L-GN/WH 1749 IAC Coil B High Control
72 L-GN/BK 444 IAC Coil B Low Control
73 L-BU/WH 1747 IAC Coil A High Control
74 - - Not Used
75 D-GN 676 HO2S Heater High Control Sensor 1
76 D-GN/WH 428 EVAP Canister Purge Solenoid Control
77 PK/BK 1746 Fuel Injector 3 Control
78 L-BU/BK 844 Fuel Injector 4 Control
79 BK/WH 451 Ground
80 BK/WH 451 Ground
Factory Service Tools

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  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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