Cummins ISX11.9 CM2250 – Service Manual 019-043   Engine Wiring Harness

Replace the engine harness if there is an open or short circuit found under the protective covering of the harness body.

Disconnect the coolant temperature sensor.

Disconnect the EGR differential pressure sensor.

Disconnect the EGR temperature sensor (1), the compressor intake temperature sensor (2), and the EGR orifice pressure sensor (3) from the engine wiring harness.

Remove the two wiring harness retaining clips from the EGR system bracket (1) and the EGR mass measurement flow assembly (2).

Remove the turbocharger actuator electrical connector.

Disconnect the aftertreatment fuel injector electrical connector.

Remove the wiring harness retaining clip from the EGR system bracket.

Remove the EGR valve electrical connector.

Disconnect the exhaust gas pressure sensor.

Disconnect the turbocharger speed sensor.

Disconnect the aftertreatment intake NOx sensor electrical connector.

Remove the two wiring harness retaining clips from the engine block.

Disconnect the crankshaft position sensor.

Remove the wiring harness retaining clip from the camshaft gear cover plate.

Remove the wiring harness retaining clip from the cylinder head.

Disconnect the crankcase pressure sensor.

Disconnect the injector pass-through connector.

Disconnect the fuel pump actuator electrical connector.

Disconnect the aftertreatment purge air actuator from the engine harness.

Remove the wiring harness retaining clip from the aftertreatment doser air purge actuator body.

Disconnect the aftertreatment fuel pressure sensor (1) and the aftertreatment fuel shutoff valve (2) from the engine wiring harness.

Disconnect the intake manifold pressure/temperature sensor.

Disconnect the fuel rail pressure sensor.

Disconnect the oil temperature sensor (1) and the oil pressure sensor (2).

If equipped, disconnect the fuel lift pump electrical connector.

Disconnect the camshaft position sensor.

Disconnect the ECM 60-pin engine connector 1 (1) and the ECM 60-pin engine connector 2 (2).

Disconnect the 14-pin OEM crossover connector (3).

Disconnect the 2-pin relay power connector (4).

Remove the wiring harness.