(Table 100, contd)
Troubleshooting Test Steps
Values
Results
10. Check the Sensor Signal Wire for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect throttle position sensor connector.
Disconnect the P1 connector from the ECM.
C. Use a suitable multimeter to measure the resistance be-
tween the sensor signal terminal on the harness connector for
the sensor and the sensor signal terminal on the P1
connector.
Less than 5
Ohms
Result:
The measured resistance is greater than 5 Ohms.
There is an open circuit or high resistance in the sensor signal
wire between the sensor connector and the P1 connector.
Check all wiring between the suspect sensor and the ECM. Re-
fer to the Electrical Schematic for the application.
Replace the faulty wiring.
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 measured resistance is less than 5 Ohms.
Contact the DSN.
If the procedure did not correct the fault, contact the DSN.
i06019830
Speed/Timing
-
Test
This procedure covers the following codes:
Table 101
Diagnostic Trouble Codes for the Engine Speed/Timing Sensors
J1939
Code
Description
Notes
190-8
Engine Speed : Abnormal Frequency, Pulse Width,
or Period
The Electronic Control Module (ECM) detects the following conditions:
A loss of signal from the primary speed/timing sensor for four camshaft
revolutions.
OR
An invalid signal from the primary speed/timing sensor.
The engine speed is at least 450 rpm.
There is a valid signal from the secondary speed/timing sensor.
The diagnostic code will be logged.
The ECM will use the signal from the secondary speed/timing sensor.
The engine will be derated. If the signal from the secondary speed/timing sen-
sor is also lost, the engine will shut down.
(continued)
210
UENR0612
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