889863 Mercruiser RING

Table 1
Diagnostic Trouble Codes for the Circuit for the Soot Sensor    
CDL Code    Description    Notes    
3397-3     DPF #1 Soot Loading Sensor : Voltage Above Normal     The Electronic Control Module (ECM) detects the following conditions:
The signal voltage for the soot sensor is greater than 32 VDC for 60 seconds.
The warning lamp will come on. The ECM will log the diagnostic code.
The ECM will ignore the signal from the soot sensor. The ECM will use the internal soot model to calculate the soot load.    
3397-4     DPF #1 Soot Loading Sensor : Voltage Below Normal     The Electronic Control Module (ECM) detects the following conditions:
The signal voltage for the soot sensor is less than 9 VDC for 60 seconds.
The warning lamp will come on. The ECM will log the diagnostic code.
The ECM will ignore the signal from the soot sensor. The ECM will use the internal soot model to calculate the soot load.    
3397-9     DPF #1 Soot Loading Sensor : Abnormal Update Rate     The ECM detects the following conditions:
There is no signal from the soot sensor.
The warning lamp will come on and the ECM will log the diagnostic code.
The ECM will use the last good value for the signal.    
3397-12     DPF #1 Soot Loading Sensor : Failure     The ECM detects the following conditions:
The soot sensor has failed.
The warning lamp will come on and the ECM will log the diagnostic code.    
3397-13     DPF #1 Soot Loading Sensor : Out of Calibration     The ECM detects the following conditions:
The soot sensor has not been calibrated by the manufacturer.
The warning lamp will come on and the ECM will log the diagnostic code.    
3397-21     DPF #1 Soot Loading Sensor : Data Drifted Low     The ECM detects the following conditions:
The soot sensor has not received a valid signal from the soot antenna for at least 60 seconds.
The warning lamp will come on and the ECM will log the diagnostic code.    
Table 2
Required Tools    
Tool     Part Number     Part Description     Qty    
A     366-7782     Attenuator     1    The following conditions must exist before any of the preceding codes will become active:
The ECM has been powered for at least 60 seconds.
There are no active 168 codes.The following background information is related to this procedure:The soot sensor is powered from the switched battery voltage. A signal is sent by the soot sensor to one soot antenna. The signal that is received by the other antenna is sent back to the soot sensor. The signal is attenuated by the soot in the Diesel Particulate Filter (DPF). The soot sensor calculates the soot load in the DPF by measuring the attenuation of the signal.
Illustration 1 g02954738
Illustration 2 g02458558
View of the pin locations on the P1 connector for the soot sensor (29) CAN B + (21) CAN B -Test Step 1. Inspect Electrical Connectors And Wiring
Thoroughly inspect the connectors for the