Troubleshooting

i06017538
Sensor Signal (Analog, Active)
- Test
(Exhaust Gas Pressure Sensor)
This procedure covers the following codes:
Table 93
Diagnostic Trouble Codes for the Engine Pressure Sensors
J1939
Code
Description
Notes
1209-3 Engine Exhaust Gas
Pressure : Voltage Above
Normal
The ECM detects the following conditions:
The signal voltage from the exhaust gas pressure sensor is greater than 4.74 VDC for at least 1.8
seconds.
The battery voltage is at least 10 VDC.
The ECM will use the default value for exhaust gas pressure while this code is active. The default value
is 50 kPa (7.25 psi).
The engine will be derated.
1209-4 Engine Exhaust Gas
Pressure : Voltage Below
Normal
The ECM detects the following conditions:
The signal voltage from the exhaust gas pressure sensor is less than 0.4 VDC for at least 1.8 seconds.
The battery voltage is at least 10 VDC.
The ECM will use the default value for exhaust gas pressure while this code is active. The default value
is 50 kPa (7.25 psi).
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.
UENR0612-07 197
Circuit Tests
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