SPRING 2690788 - Caterpillar

Illustration 5 g01837614
Harness connector for the phase module
(13) Temperature sensor positive circuit - "F"
(14) Temperature sensor negative circuit - "G"
(15) Positive 24 volt power circuit - "M"
(16) Negative 24 volt power circuit - "L"
At the harness connector for the PMC2 phase module, measure the resistance between the sensor positive contact "F" (wire RTDW2P-BK(Black)) and the 24 volt power circuit contacts "L" (wire AC24W2A-BK(Black)) and "M" (wire AC24W2B-BK(Black)) .
At the harness connector for the PMC2 phase module, measure the resistance between the sensor positive contact "G" (wire RTDW2N-BK(Black)) and the 24 volt power circuit contacts "L" (wire AC24W2A-BK(Black)) and "M" (wire AC24W2B-BK(Black)) . Expected Result:At the ECM connectors, each of the resistance measurements between the temperature sensor circuits and all of the other circuits that are used in the ECM connectors are greater than 4000 ohms. At the harness connector for the phase module, each of the resistance measurements between the temperature sensor circuits and the two power circuits are greater than 4000 ohms.Results:
OK - The resistance measurements are indicating that the temperature sensor circuits are not shorted to any other circuit in the ECM connectors or in the phase module connector. Proceed to the Test Step 5.
NOT OK - At least one or more of the resistance measurements between the temperature sensor circuits and other circuits is less than 4000 ohms. The low resistance between the circuits is indicating that there is a short circuit between one of the temperature sensor circuits and another circuit.Repair: Check the connectors that are used in the circuits for any contamination, damage, or other conditions that could cause a short circuit.Examine the wiring harness that contains both of the circuits that are indicating the low resistance measurement. Look for areas where the wire insulation could be damaged.Due to the complexity of the fiber optic circuits in the harness, the individual cabinet wiring harness for each of the phase modules is not serviceable. When a problem is found in the cabinet wiring harness for a phase module, the complete wiring harness must be replaced.If any type of damage to the wiring is found or if the connectors for the phase module wiring harness are damaged, replace the phase module cabinet wiring harness in order to resolve the problem.When a phase module wiring harness is replaced, do not bend the harness at less than a four inch radius. The light transferring ability of the fiber optic circuits will be decreased if the harness is bent at too tight of a radius. STOPTest Step 5. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the cabinet wiring connectors for the ECM and the phase module that are disconnected. Clean the contacts of the connectors. Check the wires for damage to the insulation that can be caused by excessive heat or chafing.
Reconnect all cabinet wiring connectors. Make sure that the connectors are fully seated and are fastened. Ensure that the retaining bolts are tightened.
Install the cabinet compartment cover for the phase module compartment. Ensure that all of the covers