19074 1 Mariner COVER

Table 1
Diagnostic Trouble Codes for the Engine Pressure Sensors
J1939 Code Description Notes
102-3 Engine Intake Manifold #1 Pressure : Voltage Above Normal The Electronic Control Module (ECM) detects the following conditions:
The signal voltage from the intake manifold air pressure sensor is greater than 4.92 VDC for at least 0.5 seconds.
The battery voltage is at least 10 VDC.
The ECM will use the default value for the intake manifold air pressure while this code is active. The default value is 50 kPa (7.25 psi).
The engine will be derated.
102-4 Engine Intake Manifold #1 Pressure : Voltage Below Normal The ECM detects the following conditions:
The signal voltage from the intake manifold air pressure sensor is less than 0.2 VDC for at least 0.5 seconds.
The battery voltage is at least 10 VDC.
The ECM will use the default value for the intake manifold air pressure while this code is active. The default value is 50 kPa (7.25 psi).
The engine will be derated.
108-3 Barometric Pressure : Voltage Above Normal The ECM detects that the signal voltage from the barometric pressure sensor is greater than 4.9 VDC for at least 0.8 seconds. The barometric pressure sensor is contained within the ECM.
The ECM will use the default value for the barometric pressure while this code is active. The default value is 97 kPa (14 psi).
108-4 Barometric Pressure : Voltage Below Normal The ECM detects that the signal voltage from the barometric pressure sensor is less than 0.2 VDC for at least 0.8 seconds. The barometric pressure sensor is contained within the ECM.
The ECM will use the default value for the barometric pressure while this code is active. The default value is 97 kPa (14 psi).
157-3 Engine Injector Metering Rail #1 Pressure : Voltage Above Normal The ECM detects that the signal voltage from the fuel rail pressure sensor is greater than 4.9 VDC for at least 0.2 seconds.
The engine will be derated. The engine may shut down.
157-4 Engine Injector Metering Rail #1 Pressure : Voltage Below Normal The ECM detects that the signal voltage from the intake manifold air pressure sensor is less than 0.34 VDC for at least 0.2 seconds.
The engine will be derated. The engine may shut down.
157-10 Engine Injector Metering Rail #1 Pressure : Abnormal Rate of Change The ECM detects the following conditions:
An implausible rate of change in the signal from the fuel rail pressure sensor.
The condition has been detected five times within 3 seconds.
There are no other active diagnostic codes for the fuel rail pressure sensor.
This diagnostic code indicates an intermittent connection in the circuit for the fuel rail pressure sensor.
3251-3 Particulate Trap Differential Pressure : Voltage Above Normal The ECM detects that the signal voltage from the Diesel Particulate Filter (DPF) differential pressure sensor is greater than 4.87 VDC for at least 1.8 seconds.
The ECM will use the default value for the DPF differential pressure while this code is active. The default value is −0.1 kPa (−0.01 psi).
If equipped, the warning lamp will flash. The engine will be derated.
3251-4 Particulate Trap Differential Pressure : Voltage Below Normal The ECM detects that the signal voltage from the DPF differential pressure sensor is less than 0.2 VDC for 1.8 seconds.
The ECM will use the default value for the DPF differential pressure while this code is active. The default value is −0.1 kPa (−0.01 psi).
If equipped, the warning lamp will flash. The engine will be derated.
102-20 Engine Intake Manifold #1 Pressure : Data Drifted High The ECM detects the following conditions:
The intake manifold pressure is greater than 7 kPa (1 psi) above the barometric pressure for at least 5 seconds.
The engine is not cranking.
The battery voltage is greater than 10 VDC.
The engine will be derated.
102-21 Engine Intake Manifold #1 Pressure : Data Drifted Low The ECM detects the following conditions:
The intake manifold pressure is greater than 7 kPa (1 psi) below the barometric pressure for at least 5 seconds.
The engine is not cranking.
The battery voltage is greater than 10 VDC.
The engine will be derated. The following conditions must exist before any of the above codes will become active:
There are no active 3509 codes.
There are no active 168 codes.The following background information is related to this procedure:The 5 VDC sensor supply provides power to all 5 VDC sensors. The ECM supplies 5.0 0.1 VDC to each of the pressure sensor connectors. The sensor supply is output short circuit protected. A short circuit to the battery will not damage the circuit inside the ECM.Pull-up VoltageThe ECM continuously outputs a pull-up voltage on the circuit for the sensor signal wire. This pull-up voltage is required for correct sensor operation and diagnostics.When the sensor is disconnected, this pull-up voltage can be measured at the harness connector for the sensor.
Illustration 1 g06551483
Schematic diagram for the engine pressure sensors
Note: The DPF differential pressure sensor is installed on engines equipped with a wall flow DPF only.
Illustration 2 g03623078
Typical view of the pin locations on the P2 connector for the pressure sensors
(10) Intake manifold air pressure sensor 5 VDC supply
(11) Fuel rail pressure sensor 5 VDC supply
(25) Intake manifold air pressure sensor ground
(26) Fuel rail pressure sensor ground
(40) Intake manifold air pressure sensor signal
(41) Fuel rail pressure sensor signal
Illustration 3 g02293895
Typical view of the pin locations on the P1 connector for the DPF differential pressure sensor
(14) DPF differential sensor 5 VDC supply
(36) DPF differential pressure sensor ground
(58) DPF differential pressure sensor signal
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P2/J2 and P1/J1 ECM connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
B. Thoroughly inspect the connectors for the engine pressure sensors. Refer to Troubleshooting, "Electrical Connectors - Inspect".
C. Perform a 30 N (6.7 lb) pull test on each of the wires in the ECM connector and the sensor connectors that are associated with the exhaust gas pressure sensor.
D. Check the harness for abrasions and for pinch points from the exhaust gas pressure sensor back to the ECM.
Damaged wire or connector
Result: A damaged wire or damaged connector was found.
Repair the damaged wire or the damaged connector. Replace