AP500F, AP555F, AP600F, AP655F, AP655F L, AP1000F and AP1055F Asphalt Pavers and SE50 and SE60 Asphalt Screeds Caterpillar

General Information

Usage:

The diagnostics for the ECM can be accessed through one of the following tools: the Operator Monitoring System and Cat^® Electronic Technician (Cat ET) Service Tool. To troubleshoot the electronic control system of the machine, additional information is required from the Service Manual of the machine. The following is some of the required support materials depending on your model:

Show/hide table

Table 1
Systems Operation, Test and Adjust
Sales Model	Serial Prefix	Systems Type	Media
AP500F	449 F5M 503 AF5	Propel	UENR5534
AP500F	449 F5M 503 AF5	Machine	UENR5536
AP555F	AP5 M45 5F5 RBM	Propel	M0069248
AP555F	AP5 M45 5F5 RBM	Machine	M0069254
AP600F	AP6 D6F	Propel	UENR5049
AP600F	AP6 D6F	Machine	UENR5051
AP600F	LR6 JA6	Propel	M0066938
AP600F	LR6 JA6	Machine	M0066948
AP655F	MH6 453 ML6 480	Propel (Mobil Track)	UENR5542
	655 452	Propel (Steel Track)	UENR5552
	MH6 453 655 452	Machine	UENR5554
	P65 479 AC6	Propel (Steel Track)	M0066852
	ML6 480 P65 479 AC6	Machine	M0066866
AP1000F	AC4	Propel	UENR3134
AP1000F	AC4	Machine	UENR3136
AP1055F	TJ5 RLM	Propel	UENR3144
AP1055F	TJ5 RLM	Machine	UENR3146
SE50 V	J97	Screed Specifications	UENR3148
SE50 VT	J6K B86	Screed Specifications	UENR3147
SE60 VT XW	TLW E99	Screed Specifications	UENR3150
SE60 V XW	JS9	Screed Specifications	UENR3150
SE60 V	JJ3	Screed Specifications	UENR3139

Show/hide table

Table 2
Electrical Schematic Reference
Sales Model	Product Type	Serial Prefix	Media
AP500F AP555F	Asphalt Paver	449 F5M AP5 M45	UENR5852
		449 F5M AP5 M45	UENR5852
		503 AF5 5F5 RBM	UENR5855
		503 AF5 5F5 RBM	UENR5855
AP600F AP655F	Asphalt Paver	AP6 655 MH6 D6F 453 452	UENR5183
		AP6 655 MH6 D6F 453 452	UENR5183
		P65 ML6 LR6 479 480 JA6 AC6	UENR5184
		P65 ML6 LR6 479 480 JA6 AC6	UENR5184
AP1000F	Asphalt Paver	AC4	UENR5174



AP1055F	Asphalt Paver	TJ5
AP1055F	Asphalt Paver	RLM	UENR5175
SE50 V	Asphalt Screed	J6K B86	UENR5976
SE50 VT	Asphalt Screed	J97	UENR5180
SE60 VT XW	Asphalt Screed	TLW E99	UENR5178
SE60 V XW	Asphalt Screed	JS9	UENR5931
SE60 V	Asphalt Screed	JJ3	UENR5979

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

Note: For All Tractors, reference "Monitor"Systems Operation, Testing and Adjusting, UENR4675.For All Screeds, reference "Monitor"Systems Operation, Testing and Adjusting, UENR3953.

When the troubleshooting procedure instructs you to “REPAIR THE HARNESS OR REPLACE THE HARNESS”, use the Electrical System Schematic for the machine that is being serviced to trace the circuit. Perform continuity checks at the harness connectors to locate harness failures. At the connectors of the components, always check the ground circuit. Less than 5 ohms of resistance is required between the ground contacts of the connector and the frame ground. The power circuits of the ECM should have less than 2 ohms of resistance between the contacts of the ground connector and the frame ground. Less than 5 ohms of resistance is required for signal circuits for normal operation. Excessive ground resistance that is greater than 5 ohms can cause incorrect diagnosing of problems.

During troubleshooting, inspect all connections before any component is replaced. If these connections are not clean and tight, permanent electrical problems or intermittent electrical problems can result. Check that the wires are pushed into the connectors completely. Make sure that the connections are tight before other tests are made.

Failure of an electrical component can cause the failure of other components. Also, failure of an electrical component can be caused by the failure of other components. Always attempt to correct the cause of an electrical system failure before you replace a component.