1352_092 Volvo.Penta Cover

Table 1
Code and Description Conditions which Generate this Code Conditions which Generate this Code
1632-9 Backup Engine Control Module abnormal update rate Communication with the backup Electronic Control Module (ECM) cannot be established within three seconds after the Primary ECM is powered up. After communication with the backup ECM has been established, communication stops for one second. The ECM will log the diagnostic code. The backup ECM will not be available for engine control. Note: This procedure checks for an open circuit or for a short circuit in the Cat Data Link. If you are experiencing problems with communications between the Cat® Electronic Technician (ET) and the Electronic Control Module (ECM), refer to Troubleshooting, "Electronic Service Tool Does Not Communicate", before you use this procedure.The Cat Data Link is the standard data link that is used by the ECM to communicate with Cat ET. The ECM communicates with Cat ET to share status information and diagnostic information. Cat ET can also be used to configure the ECM parameters. This information will not be available if communication fails between the ECM and Cat ET.
Illustration 1 g01390276
Schematic for the Cat Data Link
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Remove electrical power from the ECM.
B. Thoroughly inspect connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the Cat Data Link.
D. Check the allen head screw on each ECM connector for the proper torque. Also, check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect", for the correct torque values.
Connectors, Pins, and Sockets
Result: The harness and the connectors appear to be OK.
Proceed to Test Step 2.
Result: The connectors and/or the wiring are not OK.
Repair: Repair the connectors and/or the wiring. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the original problem is resolved.
STOP
Table 3
Resistance Measurements for the Cat Data Link
Connector and Terminal Terminal
P1-8 (Cat Data Link +) All the other terminals on the P1 connector
Negative ground
P1-9 (Cat Data Link -) All the other terminals on the P1 connector
Negative ground
Table 4
Troubleshooting Test Steps Values Results
2. Check for a Short Circuit
A. Disconnect the P1 ECM connector.
B. Disconnect Cat ET from the service tool connector.
C. Measure the resistance between the points that are listed in Table 3. Be sure to wiggle the wires in the harnesses as you make each resistance measurement.
Open Circuit
Result: Each check of the resistance indicates an open circuit.
Proceed to Test Step 3.
Result: At least one check of the resistance does not indicate an open circuit. There is a short circuit in the harness or in a connector.
Repair the connectors and/or the wiring. Replace parts, if necessary. Verify that the original problem is resolved.
STOP
3. Check for an Open Circuit
A. Fabricate a jumper wire that is long enough to create a test circuit across two terminals at the service tool connector. Use the jumper wire to create a short circuit between terminals D (Cat Data Link +) and E (Cat Data Link −) on the service tool connector.
B. Measure the resistance between P1-8 (Cat Data Link +) and P1-9 (Cat Data Link −).
Resistance
Result: Each check of the resistance checks indicates a short circuit.
1. Connect the J1/P1 connectors. Connect Cat ET to the service tool connector.
2. Check the Cat Data Link for proper operation. If the data link does not operate correctly, there may be a problem with the ECM.
Temporarily install a new ECM. Check the Cat Data Link again. If the new ECM solves the problem, install the original ECM and verify that the original problem returns. If the new ECM operates correctly and the original ECM does not operate correctly, replace the original ECM. Verify that the problem is resolved.
STOP
Result: At least one of the resistance measurements indicates an open circuit. There is an open circuit or excessive resistance in the harness. There may be a problem with a connector.
Repair the wiring and/or the connectors. Replace parts, if necessary. Verify that the original problem is resolved.
STOP