UNLOADER AS 4W9478 - Caterpillar

Connectors for the Electronic Control Module (ECM)
Illustration 1 g02141017
Locations of the components at the Engine ECM (1) P2 ECM connector (ECM side) (2) P1 ECM connector (ECM side) (3) P2 ECM connector (harness side) (4) P1 ECM connector (harness side) (5) Engine ECM
Illustration 2 g03336833
Locations of the components at the Aftertreatment ECM (6) P2 ECM connector (ECM side) (7) P1 ECM connector (ECM side) (8) P2 ECM connector (harness side) (9) P1 ECM connector (harness side) (10) Aftertreatment ECM
Illustration 3 g03750055
Locations of the components at the Aftertreatment ECM (11) 53 pin Connector (12) 86 pin Connector (13) Diesel Exhaust Fluid Control Unit (DCU)Injector Connectors
Connectors at the Valve Cover
Illustration 4 g01746753
Connector at the Injector
Illustration 5 g01717773
Typical HD injector
Illustration 6 g03337498
Typical MR injectorSensor Connectors
Analog Sensor Connector (active)
Illustration 7 g01240891
Analog Sensor Connector (passive)
Illustration 8 g01241538
Connectors for the Termination Resistor
Illustration 9 g01355248
Engine Speed/Timing Connector
Illustration 10 g01155187
Ampseal Connector (typical)
Illustration 11 g02219254
Refer to Special Instruction, REHS2556 for additional informationDeutsch Connectors (typical)
Illustration 12 g02220494
Refer to Tool Operating Manual, SEHS9615, "Servicing Deutsch HD and DT Style Connectors" for additional information