43517A 9 Mercury PLATE ASSEMBLY

Table 1
Tools Needed
Part Number Description Qty
257-9140 Digital Multimeter 1
7X-1710 Multimeter Probe (Signal Reading Probes) 1
Bypass Harness(1)
(1) Refer to Illustration 1, Illustration 2, Table 4, and Table 5 for the required parts.Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Check the connectors for the Electronic Control Module (ECM), the customer connectors, and the engine wiring for damage or incorrect attachment.
Check for the correct installation of the wires for the Cat Data Link. Refer to Installation Guide, "Wiring (Cat Data Link (CDL))" for additional information.
Check the electrical wiring and connectors of the following components for abrasion, for corrosion, or for incorrect attachment.
Global Positioning System Interface Module (GPSIM)
Engine Vision Interface Module (EVIM)
Engine Vision Display
Engine Monitoring System (EMS)
Computerized Monitoring System (CMS)
Harnesses and wiring
Verify that each individual ECM is programmed to the proper engine location.
Verify that the negative battery connections are secure and free from corrosion. Expected Result:All connectors, pins and sockets should be completely coupled and/or inserted and the harness and wiring should be free of corrosion, of abrasion, and of pinch points.Results:
OK - The harnesses and wiring appear to be OK. Proceed to Test Step 2.
Not OK - A problem has been found with a harness and/or wiring.Repair: Perform the following repair:Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Check the Display for MessagesA problem with the Cat Data Link will cause the following problems:The main EMS display module or the CMS display shows an "ERROR" message intermittently after powerup.ORThe tachometer for the EMS intermittently displays an "EE" message.Note: The tachometer for the EMS may operate properly at times.ORThe Engine Vision Display shows an "ERROR" message under all gauges.Note: The Engine Vision Display may operate properly at times.ORThe maintenance and/or the diagnostic screen for Engine Vision Display are not working properly and the message "WAITING FOR ECM" is displayed.Expected Result:The display modules do not show symptoms that are described in the above descriptions.Results:
OK - The display modules are not reporting communication errors with the Cat Data Link. The problem may be with the display module. Refer to the troubleshooting procedure for the suspect display.
Not OK - One or more of the display modules are reporting a problem with the Cat Data Link. The problem is most likely in the vessel's wiring. Proceed to Test Step 4.Test Step 3. Check the Supply Voltage at the Suspect Display
Turn the keyswitch to the ON position.
Table 2
EMS CMS GPS EVIM
+Battery Terminal 1 Terminal 1 B+ B+
-Battery Terminal 2 Terminal 2 B- B-
Use signal reading probes to verify that the display modules are receiving the correct voltage. The display modules should be receiving 21 VDC to 27 VDC. The measured voltage of the Engine Vision Display should be between 9 VDC and 38 VDC.
Verify proper installation of the wires for the Cat Data Link on each ECM.
Table 3
EMS CMS GPS EVIM
Cat Data Link + Terminal 5 Terminal 23 D+ D+
Cat Data Link − Terminal 14 Terminal 24 D- D- Expected Result:The wires for the Cat Data Link are installed properly.Results:
OK - The module is wired correctly. Proceed to Test Step 4.
Not OK - The module is not wired correctly.Repair: Correct the wiring to the module.Verify that the repairs eliminated the problem.STOPTest Step 4. Check the Cat Data Link for a Short in the Harness
Turn the keyswitch to the OFF position.
Isolate the circuit for the Cat Data Link.
Disconnect the vessel's connectors from the ECM for each of the engines that are on the Cat Data Link.
Disconnect the connections for the Cat Data Link from the EMS display module, the CMS, the EVIM, and the GPSIM.
Disconnect all of the other modules that communicate on the Cat Data Link. Note: Failure to isolate the network completely will result in resistance measurements that are inaccurate.
Measure the resistance between the terminals for the CAT Data Link at the ECM connector for the following terminals:
Cat Data Link + to −Battery
Cat Data Link − to −Battery
Cat Data Link shield to −Battery
Cat Data Link + to +Battery
Cat Data Link − to +Battery
Cat Data Link shield to +Battery
Cat Data Link + to sensor common
Cat Data Link − to sensor common
Cat Data Link shield to sensor commonNote: Wiggle the harness during the measurement in order to reveal an intermittent short.Expected Result:The correct resistance for all measurements