(Table 235, contd)
Diagnostic Codes for the Valve Position Sensors
J1939 Code PDL Code
Code Description
(code descriptions may vary)
Comments
5625-3 3513-3
Engine Exhaust Back Pressure Regulator Po-
sition : Voltage Above Normal
The ECM detects the following conditions:
The signal voltage from the position sensor on the exhaust
back pressure regulator is greater than 4.8 VDC for 0.1
seconds.
The warning lamp will come on. The ECM will log the diagnos-
tic code. The engine exhaust back pressure regulator will be
fully open while the code is active.
The engine will be derated.
5625-4 3513-4
Engine Exhaust Back Pressure Regulator Po-
sition : Voltage Below Normal
The ECM detects the following conditions:
The signal voltage from the position sensor on the exhaust
back pressure regulator is less than 0.2 VDC for 0.1 seconds.
The warning lamp will come on. The ECM will log the diagnos-
tic code. The exhaust back pressure regulator will be fully open
while the code is active.
The engine will be derated.
Follow the troubleshooting procedure in order to identify the root cause of the fault.
The following conditions must exist before any of the
preceding codes will become active:
• The ECM has been powered for at least 2
seconds.
• There are no active 168 codes.
• There are no active 3509 or 262 codes.
Use this procedure in order to troubleshoot the
position sensors for the following valves:
• NRS valve
• Exhaust back pressure regulator
Each position sensor is integral in the associated
valve. If the following procedure indicates a fault with
the position sensor, then the entire valve must be
replaced.
The following background information is related
to this procedure:
The troubleshooting procedures for the diagnostic
codes of each position sensor are identical. The 5
VDC sensor supply provides power to all 5 VDC
sensors. The ECM supplies 5.0 VDC to terminal “1”
of both valve connectors. The sensor common from
the ECM connector goes to terminal “2” of both valve
connectors. The sensor supply is output short circuit
protected. A short circuit to the battery will not
damage the circuit inside the ECM. The signal
voltage from terminal “3” of both valves is supplied to
the appropriate terminal at the P2 ECM connector.
Pull-up Voltage
The ECM continuously outputs a pull-up voltage on
the circuit for the sensor signal wire. The ECM uses
this pull-up voltage in order to detect an open in the
signal circuit. When the ECM detects a voltage above
a threshold, the ECM generates an open circuit
diagnostic code (XXXX-3).
If the sensor is disconnected, pull-up voltage
indicates that the wires are not open or shorted to
ground. The absence of pull-up voltage indicates an
open in the signal wire or a short to ground. If the
voltage is different from pull-up voltage, the signal
wire is shorted to another wire in the harness.
444 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
To Next Page
Loading...
