897345T64 Mercruiser PUMP, 24 Volt

Table 1
J1939 Code and Description CDL Code and Description Comments
3251-2
Aftertreatment #1 DPF Differential Pressure : Erratic, Intermittent, or Incorrect 2458-2
DPF #1 Differential Pressure Sensor : Erratic, Intermittent, or Incorrect The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
3251-3
Aftertreatment #1 DPF Differential Pressure : Voltage Above Normal 2458-3
DPF #1 Differential Pressure Sensor : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
3251-4
Aftertreatment #1 DPF Differential Pressure : Voltage Below Normal 2458-4
DPF #1 Differential Pressure Sensor : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
3251-20
Aftertreatment #1 DPF Differential Pressure : Data Drifted High 2458-20
DPF #1 Differential Pressure Sensor : Data Drifted High The ECM detects voltages that are not in the acceptable range, indicating that the wires are not located in the correct terminals for the Delta Pressure Sensor. The code is logged.
Note: After completing the repair, start and run the engine at less than 1000 rpm. The code should clear within 2 minutes.
3480-3
Aftertreatment #1 Fuel Pressure #1 : Voltage Above Normal 2460-3
ARD Fuel Pressure #1 Sensor : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
3480-4
Aftertreatment #1 Fuel Pressure #1 : Voltage Below Normal 2460-4
ARD Fuel Pressure #1 Sensor : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
3609-3
DPF #1 Intake Pressure : Voltage Above Normal 3464-3
DPF #1 Intake Pressure Sensor : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
3609-4
DPF #1 Intake Pressure : Voltage Below Normal 3464-4
DPF #1 Intake Pressure Sensor : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
3837-3
Aftertreatment #1 Secondary Air Pressure : Voltage Above Normal 3493-3
Aftertreatment #1 Secondary Air Pressure Sensor : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
3837-4
Aftertreatment #1 Secondary Air Pressure : Voltage Below Normal 3493-4
Aftertreatment #1 Secondary Air Pressure Sensor : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
4077-3
Aftertreatment #1 Fuel Pressure #2 : Voltage Above Normal 2497-3
ARD Fuel Pressure #2 Sensor : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
4077-4
Aftertreatment #1 Fuel Pressure #2 : Voltage Below Normal 2497-4
ARD Fuel Pressure #2 Sensor : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
The value of the parameter is set to a gauge pressure.
Illustration 1 g06349926Recommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Establish communication between Cat® Electronic Technician (ET) and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Turn the keyswitch to ON.
C. Look for a -3, or -4 active or logged codes:
Codes
Result: A -3 code is active.
Proceed to Test Step 2.
Result: A -4 code is active.
Proceed to Test Step 3.
Result: A 2458-2 or 3251-2 code is active.
Proceed to Test Step 5.
2. Create a Short at the Sensor Connector
A. Use a jumper wire to create a short circuit between the sensor signal and sensor return at the sensor connector.
B. Turn the keyswitch to ON.
C. Monitor the diagnostic codes on Cat ET. Check for an active -4 diagnostic code for the suspect sensor.
D. Turn the keyswitch to OFF.
Short Circuit
Result: A -4 diagnostic code became active after creating the short at the sensor connector. The wiring is OK.
Repair: Replace the sensor. Verify that the problem is resolved.
Result: A -4 diagnostic code does not become active for the suspect sensor.
Repair: Repair the wiring or replace the harness. Verify that the problem is resolved.
3. Create an Open at the Suspect Sensor Connector
A. Turn the keyswitch to OFF.
B. Disconnect the sensor connector of the suspect sensor with the active -4 diagnostic code.
C. Turn the keyswitch to ON.
D. Monitor the diagnostic codes on Cat ET. Check for an active -3 diagnostic code for the suspect sensor.
E. Turn the keyswitch to OFF.
Open Circuit
Result: A -3 diagnostic code became active after disconnecting the sensor. The sensor signal wiring is OK.
Proceed to Test Step 4.
Result: A -3 diagnostic code did not become active after disconnecting the sensor.
Repair: Repair the sensor signal wiring or replace the harness, Verify that the problem is resolved.
4. Check the 5 VDC Supply Voltage at the Sensor Connector
A. Turn the keyswitch to ON.
B. Measure the voltage between the sensor supply and sensor return at the suspect sensor.
Supply Voltage
Result: The supply voltage is approximately 5.0 0.2 VDC
Repair: Replace the sensor. Verify that the problem is resolved.
Result: The supply voltage is not approximately 5.0 0.2 VDC. There is a short circuit in the harness to the ECM.
Repair: Repair the wiring or replace the harness. Verify that the problem is resolved.
5. Inspect the DPF Differential Pressure Lines, Fittings, and Manifold
A. Ensure that the DPF differential pressure lines are connected.
B. Ensure that the DPF differential pressure lines, fittings, and manifold are free from obstructions. Make sure that moisture has not frozen in the lines, fittings, and manifold.
Note: The 2458-2 or 3251-2 will not activate for several hours if the ambient temperature is below 7° C (45° F) or if an active regeneration has not been performed. If troubleshooting a 2458-2 or 3251-2 and ambient temperature is below 7° C (45° F),