Troubleshooting

(Table 104, contd)
Troubleshooting Test Steps
Values Results
3. Measure the Signal Frequency at the Sensor
Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the primary speed/timing sensor.
Note: A multimeter that can measure frequency (Hz) is re-
quired for this procedure.
C. Connect the multimeter to pin 1 and pin 2 on the sensor
connector.
D. Turn the keyswitch to the START position.
E. Record the frequency while the engine is cranking.
At least 100 Hz. Result: The measured frequency is less than 100 Hz.
Remove the primary speed/timing sensor. Refer to Disassem-
bly and Assembly, “Crankshaft Position Sensor - Remove and
Install”.
Inspect the primary speed/timing sensor for damage and/or
debris.
If the primary speed/timing sensor is free from damage and/or
debris, install a new primary speed/timing sensor. Refer to Dis-
assembly and Assembly, “Crankshaft Position Sensor - Re-
move and Install”.
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
If the primary speed/timing sensor is damaged and/or contami-
nated with debris, proceed to Test Step 9.
Result:The measured frequency is greater than 100 Hz.
Proceed to Test Step 4.
4. Check the Engine Wiring Harness
A. Turn the keyswitch to the OFF position.
B. Disconnect the primary speed/timing sensor. Disconnect
the P2 ECM connector.
C. Measure the resistance between pin 1 on the harness con-
nector for the primary speed/timing sensor and P2:59.
D. Measure the resistance between pin 2 on the harness con-
nector for the primary speed/timing sensor and P2:44.
Less than 5
Ohms
Result: At least one of the resistance measurements is great-
er than 5 Ohms.
The fault is in the wiring between the primary speed/timing
sensor and the P2 connector.
Check all wiring between the primary speed/timing sensor and
the ECM. Refer to the appropriate Electrical Schematic.
Replace the faulty wiring. Use the electronic service tool to
clear all logged diagnostic codes and verify that the repair
eliminates the fault.
Result: Both resistance measurements are less than 5 Ohms.
Proceed to Test Step 10.
5. Check the Sensor Supply Voltage at the Sensor
Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the secondary speed/timing
sensor.
C. Turn the keyswitch to the ON position. Do not start the
engine.
D. Measure the voltage between pin 1 and pin 3 on the har-
ness connector for the secondary speed/timing sensor.
E. Turn the keyswitch to the OFF position.
F. Reconnect the connector for the secondary speed/timing
sensor.
4.9 V to 5.1 V Result: The measured voltage is not within the expected
range.
The fault is in the wiring between the secondary speed/timing
sensor and the P2 connector.
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 measured voltage is within the expected range.
Proceed to Test Step 6.
(continued)
UENR0612-07 229
Circuit Tests
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