Engine Control Module (ECM) Connector End Views

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

Engine Control Module (ECM) C1

 15336786 Connector Part Information  28 Way F Bosch (BK) Circuit Pin Wire Color 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 Cruise Control Set/Coast and Resume/Accelerate 5 GY 1884 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 OR 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

 15336796 Connector Part Information  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 OR/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 OR 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 Engine Control Module (ECM) Replacement

Removal Procedure Notice: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins or the soldered components on the circuit board.

Notice: Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.

Important: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.

1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life. 2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.

3. Disconnect the small ECM harness connector (3) from the ECM. 4. Remove the bolt retaining the large ECM connector to the ECM. 5. Disconnect the large ECM harness connector (4) from the ECM.

Notice: Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables or when charging the vehicles battery.

6. Use the retaining tab to release the ECM from the underhood junction block bracket.

Installation Procedure Notice: Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables or when charging the vehicles battery.

1. Use the retaining tab to secure the ECM, when installing the ECM to the underhood junction block bracket.

Notice: Refer to Fastener Notice in Cautions and Notices. 2. Connect the large ECM harness connector (4) to the ECM.

Tighten Tighten the bolt to 4 N·m (35 lb in).

3. Connect the small ECM harness connector (3) to the ECM. 4. Connect the negative Battery Cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical. 5. Program the ECM. Refer to Service Programming System (SPS) in Programming.