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Injector Solenoid Circuit - Test. Use this procedure for the following conditions. Inspect the Electrical Connectors and the Wiring, страница 2

When a weak cylinder (malfunctioning injector) is cut out, the increase in "Fuel Position" will not be as large as the increase for a cylinder that has an acceptable level of performance.

Note: Prior to running the "Cylinder Cutout Test", all active diagnostic codes must be repaired.

"Injector Solenoid Test"

Use the "Injector Solenoid Test" to diagnose an open circuit or a short circuit in the wiring for the injector solenoids. With the engine stopped, the "Injector Solenoid Test" will briefly activate each injector solenoid. An audible click can be heard as each solenoid is activated. After performing the test, Cat ET will indicate the status of the solenoid as "OK", "Open", or "Short".

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Illustration 1

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Schematic for the injector solenoids

Test Step 1. Inspect the Electrical Connectors and the Wiring

------ WARNING! ------

Electrical shock hazard. The electronic unit injector system uses 90-120 volts.

----------------------
  1. Remove the electrical power from the ECM.

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Illustration 2

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Left side engine view (typical example)

(1) J2/P2 ECM connectors

(2) R1/P3 Injector valve cover entry connectors (right bank)

(3) R1/P4 Injector valve cover entry connectors (left bank)

  1. Thoroughly inspect connectors (1), (2), and (3). Refer to Troubleshooting, "Electrical Connectors - Inspect".

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Illustration 3

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P2 terminals that are associated with the injector solenoids

(P2-18) Injector 8 return

(P2-21) Injector 10 return

(P2-22) Injector 4 return

(P2-31) Injector 6 return

(P2-42) Injector 12 return

(P2-50) Injector 2 return

(P2-58) Injectors 10 & 12 supply

(P2-67) Injectors 6 & 8 supply

(P2-68) Injectors 2 & 4 supply

(P2-99) Injectors 9 & 11 supply

(P2-104) Injectors 1 & 3 supply

(P2-105) Injector 11 return

(P2-106) Injector 5 return

(P2-107) Injector 9 return

(P2-108) Injector 7 return

(P2-115) Injectors 5 & 7 supply

(P2-116) Injector 1 return

(P2-118) Injector 3 return

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Illustration 4

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P4 terminals that are associated with the injector solenoids

(P4-1) Injector 12 return

(P4-2) Injector 10 return

(P4-3) Injector 8 return

(P4-4) Injector 6 return

(P4-5) Injector 4 return

(P4-6) Injector 2 return

(P4-7) Injectors 10 & 12 supply

(P4-8) Injectors 6 & 8 supply

(P4-9) Injectors 2 & 4 supply

View Image

https://sis.cat.com/sisfiles/g01/161/g01161232.gif

Illustration 5

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P3 terminals that are associated with the injector solenoids

(P3-1) Injector 1 return

(P3-2) Injector 3 return

(P3-3) Injector 5 return

(P3-4) Injector 7 return

(P3-5) Injector 9 return

(P3-6) Injector 11 return

(P3-7) Injectors 1 & 3 supply

(P3-8) Injectors 5 & 7 supply

(P3-9) Injectors 9 & 11 supply

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