ENGINE AR-PRIMARY 4310731 - Caterpillar

Connectors for the Electronic Control Module (ECM)
Illustration 1 g06123997
Locations of the components on the engine ECM
(1) P2 ECM connector (harness side)
(2) P2 ECM connector (ECM side)
(3) Engine ECM
(4) P1 ECM connector (ECM side)
(5) P1 ECM connector (harness side)
Illustration 2 g06124000
Numbering arrangement of ECM connector pins
Terminal Removal
Table 1
Required Tools
Tool Part Number Part Description Qty
A 151-6320 Removal Tool (Red) 1
Illustration 3 g01877813
Removal Tool
Remove the connector from the ECM. Refer to Disassembly and Assembly, "Electronic Control Module - Remove and Install".
Position Tooling (A) around wire (2).Note: Make sure that the tool stays perpendicular to the face of connector (1).
Push the tool into the hole for the terminal. Gently pull the wire to remove the terminal from the rear of connector (1).
Remove the Tooling (A) from the wire.Note: If a terminal must be replaced, part number 9X-3402 must be used for 16 and 18 AWG wire. Part number 126-1768 must be used for 14 AWG wire.Terminal Insertion
Push the terminal into the rear of connector (1) until the terminal engages with the locking device.
Gently pull on wire (2) to make sure that the terminal is retained by the locking device.
Connect the connector to the ECM and then tighten the retaining screw to a torque of 6 N m (53 lb in).Injector Connectors
Connectors at the Valve Cover
Illustration 4 g03745086Sensor Connectors
Analog Sensor Connector (active)
Illustration 5 g01240891Analog Sensor Connector (passive)
Illustration 6 g01241538Connectors for the Termination Resistor
Illustration 7 g01355248Engine Speed/Timing Connector
Illustration 8 g01155187Ampseal Connector (typical)
Illustration 9 g02219254Deutsch Connectors (typical)
Illustration 10 g02220494