AP-1000B, AP-1050B, AP-1055B, AP-650B, BG-225C, BG-2455C, BG-245C and BG-260C Asphalt Pavers Propel Electronic Control System Caterpillar

The diagnostics for the Propel Electronic Control System are accessed through the three digit display on the ECM. Troubleshooting the control system requires additional information from the machine Service Manual. The Electrical System Schematic, the Parts Manual, and the Operation & Maintenance Manual are required support material.

As a guide, a simplified system schematic is included at the end of this manual. For an accurate representation of the machine being diagnosed, see the Electrical System Schematic in the machine Service Manual.

When the troubleshooting procedure instructs to "repair the harness", use the Electrical System Schematic in the Machine Service Manual to trace the circuit. Perform continuity checks at connectors to locate harness failures. At component connectors, always check the ground circuit. Less than five ohms of resistance is required between the connector ground contacts and frame ground. Excessive ground resistance, greater than five ohms, can cause incorrect diagnosing of problems

During the troubleshooting procedure, inspect all component and harness connections before any component is replaced. If these connections are not clean and tight they can cause electrical problems, either permanent or intermittent (come and go). Check that the wires are pushed into the connectors completely. Make sure the connections are tight before other tests are made.

If wire insulation is punctured during troubleshooting, repair after probing. Seal the punctures with 8T-0065 Adhesive. Cover the adhesive with two layers of 1P-0810 Tape.

Failure of an electrical component can cause, or can be caused by the failure of one or more other components. Always attempt to find and correct the cause of electrical system failure before making replacement of a component.