GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Automatic Transmission Electronic Component Views
Figure 1:

Automatic Transmission Left and Right Rear Views (MX4/MTW)
Object Number: 623468 Size: LF
(1)Turbine Shaft Speed (TSS) Sensor
(2)Automatic Transmission (A/T) connector
(3)Vehicle Speed Sensor (VSS)
(4)Park/Neutral Position (PNP) Switch Connector C1
(5)PNP Switch Connector C2
(6)PNP Switch
(7)Automatic Transmission Input Shaft Speed (ISS) Sensor
(8)Engine Harness
Figure 2:

Left Exterior Bulkhead, Left Front View (LG5/MX4/MTW)
Object Number: 628139 Size: LF
(1)Transmission Control Module (TCM)
(2)Left Exterior Bulkhead
(3)TCM Mounting Bracket
(4)TCM Connector C1
(5)TCM Connector C2
(6)Engine Harness
Figure 3:

Right Exterior Bulkhead, Left Front View (L18/MX4/MTW)
Object Number: 741414 Size: LF
(1)Right Exterior Bulkhead
(2)Transmission Control Module (TCM)
(3)Engine Harness
(4)TCM Connector C1
(5)TCM Connector C2
Figure 1:

Transmission Control Module (M74)
Object Number: 769662 Size: MF
(1)Transmission Control Module Connectors
(2)Transmission Control Module
(3)Powertrain Control Module (PCM) (Gas) / Engine Control Module (ECM) (Diesel)
Figure 2:

Engine Harness to Transmission-Allison
Object Number: 769664 Size: MF
(1)Turbine Sensor Harness Connector
(2)Power Take-Off (PTO) Connector
(3)Output Speed Sensor Harness Connector
(4)Transfer Case Selector Shift Control Switch
(5)Transmission Connector Harness
(6)Park/Neutral Position (PNP) Switch Connectors
(7)Allison Transmission
(8)Engine Harness
(9)Automatic Transmission Input Shaft Speed (ISS) Sensor