(Table 229, contd)
Troubleshooting Test Steps
Values Results
6. Exchange the Sensors
A. Turn the keyswitch to the OFF position.
B. Exchange the primary speed/timing sensor with the secon-
dary speed/timing sensor. Refer to Disassembly and Assem-
bly, “Crankshaft Position Sensor - Remove and Install” and
refer to Disassembly and Assembly, “Camshaft Position Sen-
sor - Remove and Install”.
C. Turn the keyswitch to the ON position.
D. Start the engine.
E. Use the electronic service tool to check for active diagnostic
codes. Wait for 30 seconds in order for diagnostic codes to be-
come active.
A 190-8 diagnostic
code was previously
active. A 723-8, or
342-8 diagnostic
code is now active.
OR
A 723-8, or 342-8 di-
agnostic code was
previously active. A
190-8 diagnostic
code is now active.
Result: The active diagnostic code is now for the other
speed/timing sensor.
Repair: Turn the keyswitch to the OFF position.
Disconnect the suspect sensor and remove the suspect
sensor from the engine.
Install a replacement sensor. Refer to Disassembly and
Assembly, “Crankshaft Position Sensor - Remove and
Install” or refer to Disassembly and Assembly, “Camshaft
Position Sensor - Remove and Install”.
Turn the keyswitch to the ON position and start the
engine.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The diagnostic code that was previously active
is still active.
Proceed to Test Step 7.
7. Check the Signal Wire for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector. Disconnect the connector for
the suspect speed/timing sensor.
C. Check the resistance between terminal 2 on the harness
connector for the sensor and the appropriate terminal on the
P2 connector. Refer to Illustration 155 .
Less than two Ohms Result: The resistance is greater than two Ohms - There
is an open circuit or high resistance in the signal wire.
Repair: Repair the faulty wiring or replace the faulty
wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The resistance is less than two Ohms.
Proceed to Test Step 8.
8. Check the Signal Wire for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector. Disconnect the connector for
the suspect speed/timing sensor.
C. Check the resistance between the suspect sensor signal
terminal and all other terminals on the P2 connector.
Refer to Illustration 156 .
Greater than 100
Ohms
Result: At least one of the resistance measurements is
less than 100 Ohms. The fault is in the sensor signal
wiring.
Repair: Repair the faulty wiring or replace the faulty
wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: All resistance measurements are greater than
100 Ohms.
Proceed to Test Step 9.
(continued)
UENR4469-36 437
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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