09491-85005 Suzuki Jet, Main 85

Table 1
Diagnostic Codes
J1939 Code and Description Conditions which Generate the Code System Response
3351-5 Engine Oil Priming State : Current Below Normal The Electronic Control Module (ECM) detects an open in the circuit for the prelubrication relay.
The ECM detects a short to battery voltage in the circuit for the prelubrication relay. The code is logged.
3351-6 Engine Oil Priming State : Current Above Normal The ECM detects a short in the circuit for the prelubrication relay. The ECM can lubricate the engine before cranking begins. This engine prelubrication is used to increase the life of certain engine parts by lubricating these parts before the starting motor is engaged.There are several configuration parameters that define the operation of the prelubrication system. Prior to troubleshooting problems that are associated with the prelubrication system, check the settings of these parameters. Be sure that you understand the proper operation of the system. The charge pressure status of the prelubrication system may be communicated to several different controllers that are on the application. Depending on the status that is communicated there could be an effect on the engine starting. The following status indicators are communicated over the data link:
"Prelube OFF" or "Prelube disabled"
"Prelube waiting for oil"
"Prelube waiting to fill"
"Perlube ready to start"
"Prelube failed"
"Prelube ready to start"
"Continuous prelube"Some of these status indicators report the parameter settings of the prelubrication system. The ECM determines the charge pressure status via the engine oil pressure sensor.The prelubrication system is activated at ECM powerup. The ECM prevents the starting motor from engaging while the pump builds pressure in the lubrication system.Also, a manual prelube switch may be wired to P1-60 terminal at the primary ECM connector. When this ECM input is grounded, the ECM will activate the prelubrication relay. Refer to Troubleshooting, "Switch Circuits - Test" for information related to troubleshooting this switch circuit.An override for the prelubrication system is available in Caterpillar Electronic Technician (ET). The override allows the technician to activate the prelubrication system for service and testing. The test is functional only when the engine speed is zero rpm. The test is accessed by selecting the following menus on Cat ET:
"Diagnostics"
"Diagnostic Tests"
"Override Parameters"
Illustration 1 g03285602
Schematic for the prelubrication system
Illustration 2 g01527085
Location of the prelubrication pump and the prelubrication relay (left side engine view)
(1) Prelubrication pump
(2) Prelubrication relay
Illustration 3 g03288852
Location of the ECM connectors (front side engine view)
(3) ECM
(4) J2/P2 ECM connector
(5) J1/P1 ECM connector
Illustration 4 g01284151
Location of the terminals at the P1 ECM connector for the prelubrication system
(P1-12) Prelubrication relay
Illustration 5 g03289166
Location of the terminals at the P2 ECM connector for the prelubrication system
(P2-60) Digital return
Illustration 6 g03289837
Location of the terminals at the connector for the left rail
(Terminal 21) Prelubrication relay
(Terminal 22) Digital return
Illustration 7 g03289957
Location of the terminals at the prelubrication relay
(6) Blade terminals for the control circuit at the prelubrication relay
(7) Terminal bolts for the secondary circuit at the prelubrication relay
Illustration 8 g01155187
Locations of the terminals at the harness connector for the prelubrication relay
(Terminal 1) Prelubrication relay
(Terminal 2) Digital return
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Remove the electrical power from the ECM.
B. Thoroughly inspect connectors (4), (5), and (6). Also, thoroughly inspect the other connectors for the prelubrication relay that are in the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the proper procedure for inspecting the connectors and the wiring.
C. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors and the other connections that are associated with the circuit.
D. Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
E. Check the harness and the wiring for abrasion and for pinch points.