9724 4 Mercury THROTTLE VALVE

Test Step 1. Inspect the Electrical Connectors and the Wiring
Illustration 1 g01252833
Location of the ECM and the harness connectors (typical left side engine view)
(1) J2/P2 ECM connectors
(2) J1/P1 ECM connectors
(3) ECM
Thoroughly inspect connectors (1) and (2) that are for ECM (3). Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 2 g01252845
Terminal locations at the J1/P1 ECM connectors that are associated with the ECM memory
(J1-8) ATA Data Link (+)
(J1-9) ATA Data Link (−)
(J1-48) unswitched +Battery
(J1-52) unswitched +Battery
(J1-53) unswitched +Battery
(J1-61) −Battery
(J1-63) −Battery
(J1-65) −Battery
(J1-70) Keyswitch input
Perform a 45 N (10 lb) pull test on each of the wires at the ECM connectors that are associated with the circuit.
Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and the wiring for abrasion and pinch points from the data link connectors, the batteries, and the keyswitch back to the ECM. Expected Result:All connectors, pins and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals for each of the connectors are properly in place and ensure that the connectors are completely coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check for an active 252-11 or 253-02 code. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Turn the keyswitch to the OFF position. Expected Result:There are no active diagnostic codes and the ECM parameters and data appear to be correct.Results:
OK - There are no active diagnostic codes and the ECM parameters and data appear to be correct.Repair: There does not appear to be a problem with the ECM memory at this time. There may have been an intermittent electrical problem in the vehicle harness or in a connector. If an intermittent electrical problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to troubleshooting intermittent electrical problems.STOP
Active 252-11 - There is an active 252-11 at this time. There appears to be engine software that is installed into the ECM that is incorrect. Proceed to Test Step 3.
Active 253-02 - There is an active 253-02 at this time. There may be engine parameters that have not yet been programmed into the ECM. Proceed to Test Step 4.
Scrambled parameters or corrupt data - There are scrambled parameters or incorrect data. There are scrambled parameters or incorrect data that is being displayed. Proceed to Test Step 5.Test Step 3. Check the Part Number for the ECM Flash File
Turn the keyswitch to the ON position.
Use Cat ET to check that the most current version of the flash files have been installed in the ECM.
Turn the keyswitch to the OFF position. Expected Result:The flash file that is installed in the ECM is the latest version.Results:
OK - The flash files are the latest version.Repair: Clear the 252-11 code. Clearing this diagnostic code requires factory passwords. Verify that the code does not recur.STOP
Not OK - The flash files are not the latest version.Repair: Perform the following procedure:
Obtain the latest version of the flash files for both the engine ECM and the Caterpillar Monitoring System. Note: The "Flash File Search" tool on the Service Technician Workbench (STW) can be used to obtain flash files. SIS Web can also be used to obtain the flash files by clicking the "Service Software Files" feature that is on the SIS Web web site.
Use Cat ET to install the flash files. Verify that the original problem has been resolved. STOPTest Step 4. Determine Parameters that Require Programming
Turn the keyswitch to the ON position.
Use Cat ET to check the list of parameters that are not programmed. Record the parameters that are not programmed.
Program these parameters to the correct values.
Turn the keyswitch to the OFF position. Expected Result:The ECM allows the parameters that are listed to be programmed.Results:
OK - The ECM allows the parameters to be programmed to the correct values.Repair: Clear the 253-02 code. Verify that the code does not recur.STOP
Not OK - The parameters could not be programmed.Repair: There is a problem with the ECM. Perform the following procedure:
Temporarily connect a test ECM. Refer to Troubleshooting, "Replacing the ECM".
Recheck the circuit in order to ensure that the original problem has been resolved. If the problem is resolved with the test ECM, install the suspect ECM. If the problem returns with the suspect ECM, replace the ECM. Verify that the problem is resolved.If the problem is not resolved with the test ECM, install the original ECM. There is a problem in the wiring.STOPTest Step 5. Review Parameters and Data
Turn the keyswitch to the ON position.
Review the customer and system parameters.
Review the engine lifetime totals. Expected Result:The parameters and engine lifetime totals are OK.Results:
OK - The parameters and engine lifetime totals are OK.Repair: The parameters and totals are not scrambled. Attempt to reprogram any suspect parameters. If the ECM does not retain the information, there may be a problem with the unswitched battery circuit that is part of the vehicle wiring. There may be a problem with the ECM.Check that the