09491-25002 Suzuki Jet, main stamp: 622

Table 1
J1939 Code and Description CDL Code and Description Comments
678-3
ECU 8 Volts DC Supply : Voltage Above Normal 41-3
8 Volt DC Supply : Voltage Above Normal The code is logged.
678-4
ECU 8 Volts DC Supply : Voltage Below Normal 41-4
8 Volt DC Supply : Voltage Below Normal The code is logged.
3509-3
Sensor Supply Voltage 1 : Voltage Above Normal 262-3
5 Volt Sensor DC Power Supply : Voltage Above Normal All sensors are set to default values.
The code is logged.
3509-4
Sensor Supply Voltage 1 : Voltage Below Normal 262-4
5 Volt Sensor DC Power Supply : Voltage Below Normal All sensors are set to default values.
The code is logged.
3510-3
or Supply Voltage 2 : Voltage Above Normal 2131-3
5 Volt Sensor DC Power Supply #2 : Voltage Above Normal Engine power may be derated.
The code is logged.
3510-4
Sensor Supply Voltage 2 : Voltage Below Normal 2131-4
5 Volt Sensor DC Power Supply #2 : Voltage Below Normal Engine power may be derated.
The code is logged. System OperationThe Electronic Control Module (ECM) supplies a regulated voltage of 5.0 0.2 VDC to the following sensors:
Atmospheric pressure sensor
Buffer for the exhaust temperature sensors (left side)
Buffer for the exhaust temperature sensors (right side)
Crankcase pressure sensor
Engine oil pressure sensor
Fuel pressure sensors (unfiltered and filtered)
Intake manifold pressure sensor
Coolant pressure sensors
Oil quality sensor
Air filter restriction pressure sensorThe ECM supplies a regulated voltage of 8.0 0.4 VDC to the following sensor:
Engine oil level sensor
Decelerator position sensorThe supply voltage for the sensors is routed from the ECM to terminal 1, or terminal A of each sensor connector. The sensor return for the sensors is routed from the ECM to terminal 2, or terminal B of the sensor connector.The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.Note: The sensors are not protected from overvoltage. A short from the supply line to the +Battery may damage the sensors. If any of the three diagnostic codes are active, a sensor may have been damaged. Repair the sensor supply and check for any active sensor diagnostic codes to determine if a sensor has been damaged.
Illustration 1 g06439881
Schematic of the circuits for the analog sensor supplies
Illustration 2 g06421906
Illustration 3 g02315596
Schematic of the circuits for the digital sensor supply
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect the connectors. Refer to Troubleshooting, "Electrical Connectors-Inspect" for additional information.
C. Perform a 45 N (10 lb) pull test on the connector wires.
D. Check the harness for abrasions and pinch points.
Connectors and Wiring
Result: The connectors and wiring appear to be OK.
Proceed to Test Step 2.
Result: There is a problem with the connectors and/or wiring.
Repair: Repair or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are coupled.
If the problem is not resolved, proceed to Test Step 2.
2. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
41-3, 41-4 262-3, 262-4, 2131-3, 2131-4
Result: No diagnostic codes are active or logged.
There does not appear to be an electrical problem with the sensor supply now. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".
Result: Either the 41-3 or 41-4 diagnostic code is active or logged now. There is an electrical problem with the digital sensor supply.
Proceed to Test Step 4.
Result: Either the 2131-3 or 2131-4 diagnostic code is active or logged now. There is an electrical problem with the analog sensor supply.
Proceed to Test Step 3.
3. Disconnect the Analog Sensors While You Check for Active Diagnostic Codes
A. Restore the electrical power to the ECM.
B. Monitor the active diagnostic code screen on Cat ET while you disconnect each 5 v sensor at the sensor connector. Check for an active 262-3, 262-4, 2131-3, or 2131-4.
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
a. Disconnect the following sensors one at a time:
Atmospheric pressure sensor
Buffer for the exhaust temperature sensors (left side)
Buffer for the exhaust temperature sensors (right side)
Crankcase pressure sensor
Engine oil pressure sensor
Fuel pressure sensor (filtered fuel pressure)
Intake manifold pressure sensor
Air filter restriction pressure sensor
Coolant pressure sensors
Oil quality sensor
C. Remove the electrical power from the ECM. Restore the wiring to the original configuration.
Code
Result: The 262-3, 262-4, 2131-3, or 2131-4 diagnostic code deactivates when a particular sensor is disconnected.
Repair: Connect the suspect sensor. If the code returns, replace the sensor. Connect all of the connectors. Verify that the problem is resolved.
Result: The 262-3, 262-4, 2131-3, or 2131-4 diagnostic code remains active after all of the sensors are disconnected. The sensors are not the cause of the diagnostic code. Leave the sensors disconnected.
Proceed to Test Step 5.
4. Check the 5 V Supply Voltages at the ECM
A. Disconnect the J2/P2 and J2/P2 ECM connectors.
B. Fabricate ten jumper wires that are long enough to be used to measure the supply voltage at the ECM connector. Crimp connector sockets to one end of each jumper wire.
C. Remove the wires from the following terminal locations:
P1-2 (analog sensor supply
P1-3 (analog sensor return
P2-30 (analog sensor return
P2-54 (analog sensor supply
P2-72 (analog sensor supply
P2-80 (analog sensor supply
P2-81 (analog sensor supply
P2-83 (analog sensor return
Install a jumper wire into each of these terminal locations.
D. Connect the J2/P2 ECM connector.
Note: Ensure that the loose ends of the jumper wires do not contact any ground source.
E. Restore electrical power to the engine ECM.
F. Measure the voltage between the jumper wires in the followin