Perkins 1106D Troubleshooting Manual page 106

106
Troubleshooting Section
7. Use the electronic service tool in order to clear
all logged diagnostic codes and then verify that
the repair eliminates the fault.
STOP.
Test Step 6. Check the +5 Volt Supply
Wire for a Short to Engine Ground or a
Short to Other Wires in the Harness
A. Turn the keyswitch to the OFF position.
B. Disconnect the J2/P2 ECM connector.
C. Ensure that the analog sensors are disconnected
at the sensor connectors.
Note: Wiggle the harness during the following test
procedures in order to identify any intermittent short
connectors.
D. Measure the resistance from P2:2 to all terminals
on the P2 ECM connector. Measure the resistance
from the P2:2 to the ECM ground strap.
Expected Result:
Each resistance measurement is more than 20,000
Ohms.
Results:
•
OK – The resistance check does not indicate a
short in the engine harness to engine ground.
Repair: If a speed control device is installed,
repeat this process for J1:54. If the throttle sensors
pass the tests, the fault is intermittent.
Refer to Troubleshooting, "Electrical Connectors
- Inspect".
Use the electronic service tool in order to clear all
logged diagnostic codes.
Replace all wires to the original configuration.
Restart the Test Step.
STOP.
•
Not OK – A resistance measurement is less than
20,000 Ohms. The +5 V supply wire is shorted
in the engine harness or the +5 V supply wire is
shorted to the engine ground.
Repair: Repair the faulty wire or replace the faulty
wire.
Use the electronic service tool in order to clear all
logged diagnostic codes.
This document is printed from SPI². Not for RESALE
Verify that the repair eliminates the fault.
STOP.
Test Step 7. Measure the +5 Volt Supply
to the Sensor
A. Turn the keyswitch to the ON position.
Note: All the pressure sensors should be
disconnected.
B. Measure the voltage between terminal 1 (Pressure
sensor +5 Volts) and the engine ground for each
of the pressure sensors.
Expected Result:
The voltage is 5.0 ± 0.16 Volts DC.
Results:
•
OK – The +5 Volt supply is within the expected
range. Proceed to Test Step 8.
•
Not OK – The voltage is greater than 5.16 Volts
DC.
Repair: Check the +5 Volt supply wire for a short
to a higher voltage source.
Repair the +5 Volt supply wire and/or replace the
+5 Volt supply wire.
Verify that the repair eliminates the fault.
STOP.
Test Step 8. Check the Ground Wire
A. Turn the keyswitch to the ON position.
B. Measure the voltage between terminal 1 (pressure
sensor +5 Volts) and terminal 2 (pressure sensor
ground) on all of the pressure sensors.
C. While the voltage is monitored, perform a 45 N
(10 lb) pull test on the ground wires for the +5
Volt supply.
Expected Result:
The voltage is 5.0 ± 0.16 Volts DC.
Results:
•
OK – The voltage is within the range.
Repair: If the fault is intermittent, refer to
Troubleshooting, "Electrical Connectors - Inspect".
STOP.
KENR6201-01