5030082 JOHNSON SHIM, Forward, (1.2)

Table 1
Tools Needed
Part Number Description Qty
257-9140 Digital Multimeter 1
7X-1710 Multimeter Probe 1
Illustration 1 g01767557
Display information for the Global Positioning System Interface Module (GPSIM).
(1) Cat Data Link Receive Active
(2) Transmit to ECM.
(3) Receive a Signal from the Global Positioning System (GPS Receiver). Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Check the connections to the Electronic Control Module (ECM). Check the ECM connectors, the customer connector, and the wiring for damage or for incorrect attachment.
Check for the correct installation of the wires for the Cat Data Link. Refer to Installation Guide, "Wiring the Cat Data Link" for additional information.
Check the following components for abrasion, corrosion, or incorrect attachment:
Module for the global positioning system
Global Positioning System Interface Module (GPSIM)
Wiring
Verify that each individual ECM is programmed to the proper engine location.
Verify that the negative battery connections at the bus bar 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 connectors and the harnesses appear to be in good repair. Proceed to Test Step 2.
Not OK - A problem has been found with the harness or with a connector.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 Messages
Turn the keyswitch to the ON position.
Verify that each engine ECM is powered up.
Check the display for the GPSIM. Expected Result:The display for the GPSIM illuminates specific segments of the Light Emitting Diodes (LED) in order to display "GPS". Refer to Illustration 1 for the correct display output.Results:
OK - The "GPS" message is displayed correctly. Proceed to Test Step 3.
Not OK - The "GPS" message is not displayed correctly.Repair: The GPSIM is not working properly.Replace the GPSIM.Verify that the repair eliminates the problem.STOPTest Step 3. Check the display on the GPSIM for the Receive Indicator
Turn the keyswitch to the ON position.
Check if the receive indicator is illuminated on the display for the GPSIM. Refer to Illustration 1 . Expected Result:The Cat Data Link's receive indicator on the display for the GPSIM is illuminated.Results:
OK - The receive indicator on the display for the GPSIM is illuminated. The GPSIM is receiving communications from the Cat Data Link. Proceed to Test Step 4.
No - The receive indicator on the display for the GPSIM is not illuminated. The GPSIM is not receiving communications from the Cat Data Link. Proceed to Test Step 5.Test Step 4. Check for Proper Engine OperationUse the keyswitch to start the engine.Expected Result:The engine starts.Results:
OK - The engine started. The engine ECM is receiving power. Proceed to Test Step 7.
Not OK - The engine did not start.Repair: The engine ECM may not be receiving power. Check for battery power to the ECM. Refer to the engine Troubleshooting Manual, "Electrical Power Supply Circuit - Test" for your particular engine.STOPTest Step 5. Check the display on the GPSIM for the Transmit Indicator
Turn the keyswitch to the ON position.
Check the status indicators that are on the display for the GPSIM. Refer to Illustration 1. Expected Result:The Cat Data Link's transmit indicator on the display for the GPSIM is illuminated.Results:
OK - The transmit indicator on the display for the GPSIM is illuminated. The GPSIM is transmitting to the Cat Data Link. Proceed to Test Step 7.
Not OK - The transmit indicator on the display for the GPSIM is not illuminated.Repair: The GPSIM is not transmitting data to the Cat Data Link. Replace the GPSIM. Verify that the repair eliminates the original problem.STOPTest Step 6. Check Battery Voltage to the GPSIM
Turn the keyswitch to the OFF position.
Ensure that all of the wiring is in the original configuration.
Turn the keyswitch to the ON position.
Use signal reading probes to measure the battery supply voltage between the +Battery terminal and the −Battery terminal on the GPSIM.
Reset the module for the GPS while the voltage is being measured. Expected Result:The measured voltage is between 21 VDC and 27 VDC at the GPSIM. The voltage remains in the proper range during the resetting procedure and the voltage remains in the proper range after the display has been reset.Results:
OK - The voltage supply to the GPSIM is within specifications. The GPSIM is receiving the correct voltage. Proceed to Test Step 7.
Not OK - The voltage supply to the GPSIM is not within specifications.Repair: If the voltage to the GPSIM drops below 21 VDC, the DC/DC converter may not be supplying enough power. Replace the converter with a unit that will supply the power requirements of the GPSIM. Verify that the repair eliminated the original problem.STOPTest Step 7. Check Data Stream from the GPSIM
Connect a Personal Computer (PC) to the GPSIM. Note: An adapter cable is necessary to connect to the GPSIM. The adapter is used to convert a 25 pin D-connector to a 9 pin D-connector.
Connect the adapter cable (9 pin) to the "COM1" port on the PC.
Connect the adapter cable to the GPSIM.
Start "Hyper Terminal" on the PC.
Open the following menus in order to access "Hyper Terminal":
"Start"
"Programs"
"Accessories"
"Communications"
"Hyper Terminal"
When the "Connection Description" box appears, type in a filename for the data. Click the "OK" button.
Select "COM1" under the "Connect Using" menu. Click the "OK" button.
Change the values for the "COM1 Properties" in order to match the information in Table 2.
Table 2
"Bits per second" 4800
"Data bits" 8
"Parity" None
"Stop bits" 1
"Flow control" None When the parameters have been set, click the "OK" button.
Illustration 2 g00797785
The "Hyper Terminal" screen should display a message that is similar to Illustration 2. Expected Result:The correct message from the data stream is shown in Illustration 2.Results:
OK - The correct message from the data stream is received by the PC.Repair: The GPS is operating correctly at this time. There may be an intermittent problem in a harness or a connector. For troubleshooting that is