887798 Mercury NUT

Table 1
J1939 and Description Comments
100-3
Engine Oil Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
100-4
Engine Oil Pressure : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
101-3
Engine Crankcase Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
101-4
Engine Crankcase Pressure : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
107-3
Engine Air Filter 1 Differential Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
107-4
Engine Air Filter 1 Differential Pressure : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
108-3
Barometric Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
108-4
Barometric Pressure : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
109-3
Engine Coolant Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
109-4
Engine Coolant Pressure : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
1208-3
Engine Pre-filter Oil Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
1208-4
Engine Pre-filter Oil Pressure : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
2809-3
Engine Air Filter 2 Differential Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
2809-4
Engine Air Filter 2 Differential Pressure : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
4817-3
Engine Intake Manifold #1 Absolute Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
4817-4
Engine Intake Manifold #1 Absolute Pressure : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
5631-3
Engine Throttle Valve Differential Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
5631-4
Engine Throttle Valve Differential Pressure : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
7063-3
Engine Gaseous Fuel Supply Pressure #2 : Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged.
7063-4
Engine Gaseous Fuel Supply Pressure #2 : Voltage Below Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range.
The value of the parameter is set to a default value.
The code is logged. The ECM continuously creates a pull-up voltage on the signal wire for each sensor. The ECM uses this pull-up voltage to detect a problem in the signal circuit. When the ECM detects voltage that is above a threshold on the signal wire, the ECM activates a high voltage -3 diagnostic . When the ECM detects voltage that is below a threshold on the signal wire, the ECM activates a low voltage -4 diagnostic .Note: There may be a delay of 30 seconds in order for Cat® Electronic Technician (ET) to display an active diagnostic . When you check for a diagnostic , be sure to wait at least 30 seconds.
Illustration 1 g06405774
For the complete circuit details, refer to the full schematic.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result: A -3 code is active.
Proceed to Test Step 2.
Result: A -4 code is active.
Proceed to Test Step 3.
2. Create a Short at the Sensor Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the sensor with the active -3 code.
C. Install the jumper wire between the following terminals at the sensor connector:
- Terminal 3 (signal) and Terminal 2 (sensor return)
D. Connect Cat ET.
E. Use Cat ET