910113-0610 Tohatsu BOLT

Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
338-5 Engine Pre-Lube Pump Relay : Current Below Normal The engine Electronic Control Module (ECM) detects an open in the circuit for the engine prelubrication relay.
The ECM detects a short to battery voltage in the circuit for the prelubrication relay.
The ECM can only detect this condition when the output driver is not activated. The code is logged.
338-6 Engine Pre-Lube Pump Relay : Current Above Normal The ECM detects a short in the circuit for the prelubrication relay.
The ECM can only detect this condition when the output driver is activated. The ECM is able to lubricate the engine before cranking. This action may increase the life of certain engine parts by lubricating these parts before the starting motor is engaged.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 prelubrication system is activated at ECM powerup. The ECM prevents the starting motor from engaging while the pump builds pressure in the engine lubrication system. The ECM determines the charge pressure status via the engine oil pressure sensor.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 g01620176
Schematic for the prelubrication system
Note: The ECM can only detect a -5 code in the circuit for the prelubrication relay when the output driver is not activated. The ECM can only detect a -6 code in the circuit for the prelubrication relay when the output driver is activated.
Illustration 2 g01854436
Fuse panel that is in the cab of the machine
(1) Relay for the prelube pump motor
(2) 20 amp fuse for the prelubrication system
Illustration 3 g01619829
Location of the connectors at the ECM(typical left side engine view)
(3) J1/P1 ECM connector
(4) Right rail connectors
(5) Left rail connectors
Illustration 4 g01619831
Location of the machine interface connectors (left rear engine view)
(6) Machine interface connectors
Illustration 5 g01620944
Location of the connectors for the prelubrication pump and the prelubrication relay
(7) Battery wiring harness for the engine prelube pump
(8) Prelube pump
(9) Prelubrication relay
(10) Harness connector for the engine prelubrication relay
Illustration 6 g01620946
Location of the interface connector at the cab of the machine for the prelubrication system
(11) Interface connector at the cab of the machine
Illustration 7 g01284151
Terminal locations at the P1 ECM connector for the prelubrication system
(P1-12) Prelubrication relay
Illustration 8 g01284152
Terminal locations at the P2 ECM connector for the prelubrication system
(P2-14) Digital return
Illustration 9 g01324724
Terminal locations at the machine interface connector for the prelubrication system
(Terminal 29) Prelubrication relay
(Terminal 37) Digital Return
Illustration 10 g01854440
Terminal locations at the prelubrication relay for the power circuit of the prelubrication system
(30) Fused power to the secondary circuit relay
(85) Return circuit for the control circuit of the relay
(86) Power for the control circuit of the relay
(87) Power to the relay that is for the prelube pump motor
(87a) Unused