Contents Wiring diagrams Section: Testing & Diagnostics All sections

Engine Controls - 8.1L (Introduction): Wiring GMC Cab & Chassis Sierra 3500

Testing & Diagnostics ~2655 words

Powertrain Control Module (PCM) Connector End Views

Powertrain Control Module (PCM) - C1 Connector Part Information 12191489 80-Way F Micro-Pack 100W Sealed (BU) Pin Wire Color Circuit No. Function 1 BK/WH 451 Ground 2 L-GN 1867 12-Volt Reference 3 PK/BK 1746 Fuel Injector 3 Control 4 L-GN/BK 1745 Fuel Injector 2 Control 5-6 - - Not Used 7 GY 2705 5-Volt Reference 8-10 - - Not Used 11 L-BU 1876 Knock Sensor 2 Signal 12 D-BU/ WH 1869 CKP Sensor Signal 13 OG/BK 463 Requested Torque Signal (M74) 14 OG/BK 1061 UART Serial Data 15 D-BU/ WH 774 UART Serial Data 16-18 - - Not Used 19 PK 439 Ignition 1 Voltage 20 OG 440 Battery Positive Voltage 21 YE/BK 1868 Low Reference 22 L-GN 488 PTO on Switch Signal (PTO) 23 BK 470 Low Reference 24 BK/WH 451 Ground (NC1) 25 TN 1671 HO2S Low Signal Bank 2 Sensor 2 (NC1) 26 TN 1667 HO2S Low Signal Bank 2 Sensor 1 27 BK/WH 451 Ground (NC1) 28 TN 1669 HO2S Low Signal Bank 1 Sensor 2 (w/NC1) 29 TN/WH 1664 HO2S Low Signal Bank 1 Sensor 1 30 L-GN 1478 Coolant Level Switch Signal 31-32 - - Not Used 33 PU 420 TCC Brake Switch/Cruise Control Release Signal 34 OG/BK 1786 Park/Neutral Signal (M74) 35 GY 48 CPP Switch Signal (ML6) 36 BK 1744 Fuel Injector 1 Control 37 YE/BK 846 Fuel Injector 6 Control 38 - - Not Used 39 YE/BK 625 Starter Enable Relay Control 40 BK/WH 451 Ground 41-42 - - Not Used 43 RD/BK 877 Fuel Injector 7 Control 44 L-BU/BK 844 Fuel Injector 4 Control 45 GY 2700 5-Volt Reference 46 GY 474 5-Volt Reference 47 - - Not Used 48 GY 597 5-Volt Reference 49-50 - - Not Used 51 D-BU 496 Knock Sensor 1 Signal 52 YE 2522 PTO Engage Signal (PTO) 53 - - Not Used 54 OG/BK 469 Low Reference 55 - - Not Used 56 - - Not Used 57 OG 440 Battery Positive Voltage 58 D-GN 1049 Class 2 Serial Data 59-60 - - Not Used 61 PK/BK 632 Low Reference 62 - - Not Used 63 BK 2755 Low Reference 64 BK/WH 451 Ground 65 PU 1670 HO2S High Signal Bank 2 Sensor 2 (NC1) 66 PU 1666 HO2S High Signal Bank 2 Sensor 1 67 BK/WH 451 Ground 68 PU/WH 1668 HO2S High Signal Bank 1 Sensor 2 (NC1) 69 PU/WH 1665 HO2S High Signal Bank 1 Sensor 1 70 BN 1174 Oil Level Switch Signal 71 L-BU 494 Engine Shut Off Signal (PTO) 72 - - Not Used 73 BN/WH 633 CMP Sensor Signal 74 YE 410 ECT Sensor Signal 75 PK 1020 Ignition 0 Voltage 76 BK/WH 845 Fuel Injector 5 Control 77 D-BU/ WH 878 Fuel Injector 8 Control 78 PU 2562 PTO Control (PTO) 79 - - Not Used 80 GY 720 Low Reference

Powertrain Control Module (PCM) - C2 Connector Part Information 12191488 80-Way F Micro-Pack 100W Sealed (RD) Pin Wire Color Circuit No. Function 1 BK/WH 451 Ground 2 WH 2467 Throttle Kickdown Signal (M74) 3 TN 1465 Fuel Pump Relay Control - Secondary 4 - - Not Used 5 TN/BK 464 Delivered Torque Signal (M74) 6-8 - - Not Used 9 D-GN/ WH 465 Fuel Pump Relay Control 10 WH 121 Engine Speed Signal 11 - - Not Used 12 D-BU 2466 Trans MIL Request Signal (M74) 13 - - Not Used 14 RD/BK 380 A/C Refrigerant Pressure Sensor Signal 15 BN 25 Charge Indicator Control 16 GY/BK 1694 4WD Low Signal (NP1/NP2) 17 - - Not Used 18 D-GN 1433 Clutch Start Switch Signal (ML6) 19 BK/WH 1695 Axle Switch Signal (NP2) 20 L-GN/BK 822 VSS Low Signal 21 PU/WH 821 VSS High Signal (ML6) YE 400 Signal High - Front (M74) 22-24 - - Not Used 25 TN 472 IAT Sensor Signal 26 PU 2121 IC 1 Control 27 RD 2127 IC 7 Control 28 L-BU/WH 2126 IC 6 Control 29 D-GN/ WH 2124 IC 4 Control 30 - - Not Used 31 YE 492 MAF Sensor Signal 32 L-GN 432 MAP Sensor Signal 33 - - Not Used 34 D-GN/ WH 428 EVAP Canister Purge Solenoid Control 35-38 - - Not Used 39 RD 631 12-Volt Reference 40 BK/WH 451 Ground 41-42 - - Not Used 43 D-GN/ WH 459 A/C Compressor Clutch Relay Control 44 - - Not Used 45 WH 1310 EVAP Canister Vent Solenoid Control 46 BN/WH 419 MIL Control 47-48 - - Not Used 49 YE/BK 1827 Vehicle Speed Signal 50 D-GN/ WH 817 Vehicle Speed Signal 51 - - Not Used 52 BN 2391 HO2S Heater Low Control Bank 1 Sensor 2 (NC1) 53 RD/WH 3223 HO2S Heater Low Control Bank 2 Sensor 2 (NC1) 54 PU 1589 Fuel Level Sensor Signal 55-56 - - Not Used 57 BK 552 Low Reference 58 TN/WH 332 Oil Pressure Sensor Signal 59 PU 806 Crank Voltage 60 BN 2129 Low Reference 61 BN/WH 2130 Low Reference 62-63 - - Not Used 64 D-GN 890 Fuel Tank Pressure Sensor Signal 65 - - Not Used 66 PU/WH 2128 IC 8 Control 67 RD/WH 2122 IC 2 Control 68 D-GN 2125 IC 5 Control 69 L-BU 2123 IC 3 Control 70-71 - - Not Used 72 BK/WH 3113 HO2S Heater Low Control Bank 1 Sensor 2 (NC1) 73 D-BU 1936 Fuel Level Sensor Signal - Secondary 74 L-GN 3212 HO2S Heater Low Control Bank 2 Sensor 1 75 GY 23 Generator Field Duty Cycle Signal 76-79 - - Not Used 80 BK 2751 Low Reference

Engine Controls Connector End Views

Accelerator Pedal Position (APP) Sensor Connector Part Information 15318071 10-Way F Metri-Pack 150 Series (GY) Pin Wire Color Circuit No. Function A - - Not Used B PU 1272 5-Volt Reference C L-BU 1162 APP Sensor 2 Signal D TN 1274 Low Reference E BN 1271 Low Reference F D-BU 1161 APP Sensor 1 Signal G WH/BK 1164 5-Volt Reference H - - Not Used J-K - - Not Used

Camshaft Position (CMP) Sensor Connector Part Information 12059595 3-Way F Metri-Pack 150 Series Sealed (GY) Pin Wire Color Circuit No. Function A RD 631 12-Volt Reference B PK/BK 632 Low Reference C BN/WH 633 CMP Sensor Signal

Crankshaft Position (CKP) Sensor Connector Part Information 15324165 3-Way F Metri-Pack 150 Series (NA) Pin Wire Color Circuit No. Function A L-GN 1867 12-Volt Reference B YE/BK 1868 Low Reference C D-BU/WH 1869 CKP Sensor Signal

Engine Coolant Temperature (ECT) Sensor Connector Part Information 15324589 3-Way F Metri-Pack 150 Series Sealed (GY) Pin Wire Color Circuit No. Function A BK 407 Low Reference B YE 410 ECT Sensor Signal C - - Not Used

Evaporative Emission (EVAP) Canister Purge Solenoid Connector Part Information 12052643 2-Way F Metri-Pack 150 Series Sealed (RD) Pin Wire Color Circuit No. Function A PK 439 Ignition 1 Voltage B D-GN/WH 428 EVAP Canister Purge Solenoid Control

Evaporative Emission (EVAP) Canister Vent Solenoid Connector Part Information 12052643 2-Way F Metri-Pack 150 Series Sealed (RD) Pin Wire Color Circuit No. Function A WH 1310 EVAP Canister Vent Solenoid Control B PK 2640 Battery Positive Voltage

Fuel Injector 1 Connector Part Information 15411634 2-Way F Metri-Pack 280.1 P2S (BK) Pin Wire Color Circuit No. Function A PK/WH 1039 Ignition 1 Voltage B BK 1744 Fuel Injector 1 Control

Fuel Injector 2 Connector Part Information 15411634 2-Way F Metri-Pack 280.1 P2S (BK) Pin Wire Color Circuit No. Function A PK 1239 Ignition 1 Voltage B L-GN/BK 1745 Fuel Injector 2 Control

Fuel Injector 3 Connector Part Information 15411634 2-Way F Metri-Pack 280.1 P2S (BK) Pin Wire Color Circuit No. Function A PK/WH 1039 Ignition 1 Voltage B PK/BK 1746 Fuel Injector 3 Control

Fuel Injector 4 Connector Part Information 15411634 2-Way F Metri-Pack 280.1 P2S (BK) Pin Wire Color Circuit No. Function A PK 1239 Ignition 1 Voltage B L-BU/BK 844 Fuel Injector 4 Control

Fuel Injector 5 Connector Part Information 15411634 2-Way F Metri-Pack 280.1 P2S (BK) Pin Wire Color Circuit No. Function A PK/WH 1039 Ignition 1 Voltage B BK/WH 845 Fuel Injector 5 Control

Fuel Injector 6 Connector Part Information 15411634 2-Way F Metri-Pack 280.1 P2S (BK) Pin Wire Color Circuit No. Function A PK 1239 Ignition 1 Voltage B YE/BK 846 Fuel Injector 6 Control

Fuel Injector 7 Connector Part Information 15411634 2-Way F Metri-Pack 280.1 P2S (BK) Pin Wire Color Circuit No. Function A PK/WH 1039 Ignition 1 Voltage B RD/BK 877 Fuel Injector 7 Control

Fuel Injector 8 Connector Part Information 15411634 2-Way F Metri-Pack 280.1 P2S (BK) Pin Wire Color Circuit No. Function A PK 1239 Ignition 1 Voltage B D-BU/WH 878 Fuel Injector 8 Control

Fuel Pump (FP) Relay - Secondary (Dual Tanks) Connector Part Information 12129716 4-Way F Metri-Pack 280 FLX LK (MD GY) Pin Wire Color Circuit No. Function 30 PK 139 Ignition 1 Voltage 85 GY 120 Fuel Pump Supply Voltage 86 TN 1465 Fuel Pump Relay Control - Secondary 87 L-GN 1058 Fuel Balance Pump Supply Voltage

Fuel Pump and Sender Assembly - Primary Connector Part Information 15326631 4-Way F GT 280 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 2150 Ground B BK 470 Low Reference C PU 1589 Fuel Level Sensor Signal - Primary D GY 120 Fuel Pump Supply Voltage

Fuel Pump and Sender Assembly - Secondary (Dual Tanks) Connector Part Information 15326631 4-Way F GT 280 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 2150 Ground B BK 470 Low Reference C D-BU 1936 Fuel Level Sensor Signal D L-GN 1058 Fuel Balance Pump Supply Voltage

Fuel Tank Pressure (FTP) Sensor Connector Part Information 12059595 3-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 470 Low Reference B D-GN 890 Fuel Tank Pressure Sensor Signal C GY 474 5-Volt Reference

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Connector Part Information 12092839 4-Way M Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A TN 1664 HO2S Low Signal Bank 1 Sensor 1 B PU/WH 1665 HO2S High Signal Bank 1 Sensor 1 C - - Not Available D PK 539 Ignition 1 Voltage E BK/WH 3113 HO2S Heater Low Control Bank 1 Sensor 1

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 (NC1) Connector Part Information 12146047 4-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A TN/WH 1669 HO2S Low Signal Bank 1 Sensor 2 B PU/WH 1668 HO2S High Signal Bank 1 Sensor 2 C - - Not Available D PK 1539 Ignition 1 Voltage E BN 2391 HO2S Heater Low Control Bank 1 Sensor 2

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Connector Part Information 12092839 4-Way M Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A TN 1667 HO2S Low Signal Bank 2 Sensor 1 B PU 1666 HO2S High Signal Bank 2 Sensor 1 C - - Not Available D PK 539 Ignition 1 Voltage E L-GN 3212 HO2S Heater Low Control Bank 2 Sensor 1

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 (NC1) Connector Part Information 12092839 4-Way M Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A TN 1671 HO2S Low Signal Bank 2 Sensor 2 B PU 1670 HO2S High Signal Bank 2 Sensor 2 C - - Not Available D PK 1539 Ignition 1 Voltage E RD/WH 3223 HO2S Heater Low Control Bank 2 Sensor 2

Ignition Coil 1 Connector Part Information 15366040 4-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 550 Ground B BN 2129 Low Reference C PU 2121 IC 1 Control D PK 1039 Ignition 1 Voltage

Ignition Coil 2 Connector Part Information 15366040 4-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 550 Ground B BN 2130 Low Reference C RD 2122 IC 2 Control D PK 1239 Ignition 1 Voltage

Ignition Coil 3 Connector Part Information 15366040 4-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 550 Ground B BN 2129 Low Reference C L-BU 2123 IC 3 Control D PK 1039 Ignition 1 Voltage

Ignition Coil 4 Connector Part Information 15366040 4-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 550 Ground B BN 2130 Low Reference C D-GN 2124 IC 4 Control D PK 1239 Ignition 1 Voltage

Ignition Coil 5 Connector Part Information 15366040 4-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 550 Ground B BN 2129 Low Reference C D-GN 2125 IC 5 Control D PK 1039 Ignition 1 Voltage

Ignition Coil 6 Connector Part Information 15366040 4-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 550 Ground B BN 2130 Low Reference C L-BU 2126 IC 6 Control D PK 1239 Ignition 1 Voltage

Ignition Coil 7 Connector Part Information 15366040 4-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 550 Ground B BN 2129 Low Reference C RD 2127 IC 7 Control D PK 1039 Ignition 1 Voltage

Ignition Coil 8 Connector Part Information 15366040 4-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BK 550 Ground B BN 2130 Low Reference C PU 2128 IC 8 Control D PK 1239 Ignition 1 Voltage

Knock Sensor (KS) - Bank 1 Connector Part Information 15355362 1-Way F Metri-Pack 150 Series Sealed (NA) Pin Wire Color Circuit No. Function 1 D-BU 496 Knock Sensor - 1 Signal

Knock Sensor (KS) - Bank 2 Connector Part Information 15355362 1-Way F Metri-Pack 150 Series Sealed (NA) Pin Wire Color Circuit No. Function 1 L-BU 1876 Knock Sensor - 2 Signal

Mass Air Flow (MAF) Sensor/Intake Air Temperature (IAT) Connector Part Information 15305555 5-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BK 552 Low Reference B TN 472 IAT Sensor Signal C BK/WH 451 Ground D PK 439 Ignition 1 Voltage E YE 492 MAF Sensor Signal

Manifold Absolute Pressure (MAP) Sensor Connector Part Information 12129946 3-Way F Metri-Pack 150 Series Sealed (GY) Pin Wire Color Circuit No. Function A OG/BK 469 Low Reference B L-GN 432 MAP Sensor Signal C GY 597 5-Volt Reference

Throttle Actuator Control (TAC) Module - C1 Connector Part Information 12191068 16-Way F Micro-Pack 100 Series (GY) Pin Wire Color Circuit No. Function 1 D-GN 485 TP Sensor 1 Signal 2 GY 416 5-Volt Reference 3 BK 452 Low Reference 4 D-BU 84 Cruise Control Set/Coast Switch Signal 5 GY/BK 87 Cruise Control Resume/Accel Switch Signal 6 L-BU 1320 CHMSL Supply Voltage 7 PK 1339 Ignition 1 Voltage 8 BN 582 TAC Motor Control - 2 9 L-BU/BK 1688 5-Volt Reference 10 BK/WH 1704 Low Reference 11 PU 486 TP Sensor 2 Signal 12 OG/BK 1061 UART Serial Data 13 D-BU/WH 774 UART Serial Data 14 GY 397 Cruise Control On Switch Signal 15 BK/WH 550 Ground 16 YE 581 TAC Motor Control - 1

Throttle Actuator Control (TAC) Module - C2 Connector Part Information 12177081 10-Way F 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A - - Not Used B PU 1272 5-Volt Reference C L-BU 1162 APP Sensor 2 Signal D TN 1274 Low Reference E - - Not Used F D-BU 1161 APP Sensor 1 Signal G WH/BK 1164 5-Volt Reference H-J - - Not Used

Throttle Body Connector Part Information 15326836 8-Way F GT 150 Series (BK) Pin Wire Color Circuit No. Function A YE 581 TAC Motor Control - 1 B BK/WH 1704 Low Reference C BN 582 TAC Motor Control - 2 D BK 452 Low Reference E L-BU/BK 1688 5-Volt Reference F PU 486 TP Sensor 2 Signal G D-GN 485 TP Sensor 1 Signal H GY 416 5-Volt Reference