Water In Fuel - Test - Perkins 854F-E34T Troubleshooting Manual

234
Circuit Tests
(Table 113, contd)
Troubleshooting Test Steps
8. Create a Short Circuit at the ECM Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector from the ECM.
C. Fabricate a jumper wire that is 150 mm (6 inch) long. Install
the jumper between the suspect sensor signal pin and the
sensor ground pin on the J2 connector.
D. Turn the keyswitch to the ON position. Do not attempt to
start the engine. Wait at least 10 seconds for activation of the
diagnostic codes.
E. Use the electronic service tool to check for an active XX-4
diagnostic code for the suspect sensor.
Note: Diagnostic codes for all of the engine sensors will be ac-
tive with the P2 connector disconnected. Ignore all other co-
des and only look for codes that relate to the suspect sensor.
F. Turn the keyswitch to the OFF position. Remove the jumper
wire.
9. Check if a Replacement ECM Eliminates the Fault
A. Contact the Dealer Solution Network (DSN).
B. If the DSN recommends the use of a replacement ECM, in-
stall a replacement ECM. Refer to Troubleshooting, "Replac-
ing the ECM".
C. Use the electronic service tool to recheck the system for ac-
tive diagnostic codes.

Water in Fuel - Test

For a 97-15 diagnostic code, refer to Troubleshooting,
"Fuel Contains Water" before returning to this
procedure.
Water-in-Fuel Sensor Operation
The Water In Fuel (WIF) sensor is a normally open
sensor. During normal operation, there will be no
signal sent from the WIF sensor to the ECM. If water
is detected in the fuel, the sensor will send a signal to
the ECM. If the signal remains constant for 60
seconds, a 97-15 diagnostic code will become active.
This diagnostic code can also be caused by a short in
the WIF sensor circuit.
This document has been printed from SPI2. NOT FOR RESALE
Values
Diagnostic Result: An XX-4 diagnostic code is active with the jumper wire
codes installed.
The fault is in the wiring for the suspect sensor between the
suspect valve connector and the P2 connector.
Check all wiring between the suspect valve and the ECM. Refer
to the appropriate Electrical Schematic.
Replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: The XX-3 diagnostic code is still active with the jumper
wire installed.
Proceed to Test Step 9.
Diagnostic Result: There are no active diagnostic codes with the replace-
codes ment ECM.
Reconnect the suspect ECM. If the fault returns with the sus-
pect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
Result: The diagnostic code is still present with the replace-
ment ECM.
Contact the DSN.
i05946674
UENR0612
Results