0328458 JOHNSON EXHAUST HOUSING ASSY.

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 V for at least 0.5 seconds.
The battery voltage is at least 10 V.
The ECM will use the default value for the intake manifold air pressure while this code is active. The default value is 98 kPa (14.2 psi).
The warning lamp will flash. 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 V for at least 0.5 seconds.
The battery voltage is at least 10 V.
The ECM will use the default value for the intake manifold air pressure while this code is active. The default value is 98 kPa (14.2 psi).
The warning lamp will flash. 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 V 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).
The warning lamp will flash. The engine will be derated.
108-4 Barometric Pressure : Voltage Below Normal The ECM detects that the signal voltage from the barometric pressure sensor is less than 0.2 V 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).
The warning lamp will flash. The engine will be derated.
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 V 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 V 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.
The warning lamp will come on.
102-20 Engine Intake Manifold #1 Pressure : Data Drifted High The ECM detects the following conditions:
The intake manifold pressure is greater than 10 kPa (1.5 psi) above the barometric pressure for at least 5 seconds.
The engine is not cranking.
The battery voltage is greater than 10 V.
The warning lamp will flash. 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 10 kPa (1.5 psi) below the barometric pressure for at least 5 seconds.
The engine is not cranking.
The battery voltage is greater than 10 V.
The warning lamp will flash. 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 V sensor supply provides power to all 5 V sensors. The ECM supplies 5.0 0.1 V 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 g03732068
Schematic diagram for the engine pressure sensors
Illustration 2 g03732070
View of the pin locations on the 62-pin engine interface connector for the pressure sensors.
(5) Fuel rail pressure sensor ground
(6) Fuel rail pressure sensor signal
(7) Fuel rail pressure sensor 5 supply
(17) Intake manifold air pressure sensor 5 V supply
(18) Intake manifold air pressure sensor signal
(19) Intake manifold air pressure sensor ground
Illustration 3 g03623078
Typical view of the pin locations on the P2 connector for the pressure sensors
(10) Intake manifold air pressure sensor 5 V supply
(11) Fuel rail pressure sensor 5 V 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
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P2/J2 ECM connector. 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 engine pressure sensors.
D. Check the harness for abrasions and for pinch points from the engine pressure sensors back to the ECM.
Damaged wire or connector
Result: A damaged wire or damaged connector was found.
Repair: Repair the damaged wire or the damaged connector. Replace any blown fuses
Use the electronic service tool to clear all logged diagnostic codes. Verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly connected and/or inserted and the harness is free of corrosion, of abrasion or of pinch points.
Proceed to Test Step 2.
2. Check For Active Diagnostic Codes
A. Turn the keyswitch to the ON position. Wait at least 10 seconds for activation of the diagnostic codes.
B. Verify if any of the diagnostic codes that are listed in Table 1 are active.
Diagnostic codes
Result: A 108-3 or 108-4