Troubleshooting

(Table 104, contd)
Troubleshooting Test Steps
Values Results
6. Check for Signal 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 attempt to
start the engine.
D. Measure the voltage between pin 1 and pin 2 on the har-
ness connector for the secondary speed/timing sensor.
E. Turn the keyswitch to the OFF position.
F. Reconnect the secondary speed timing sensor.
4.52 to 4.72 V Result: The measured voltage is within the expected range.
Replace the secondary speed/timing sensor. Refer to Disas-
sembly and Assembly, “Camshaft Position Sensor - Remove
and Install” for the correct procedure.
Start the engine. Use the electronic service tool to clear all
logged diagnostic codes and verify that the repair eliminates
the fault.
Result: The measured voltage is not within the expected
range.
Proceed to Test Step 7.
7. Check the Sensor Signal Voltage at the ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector.
C. Turn the keyswitch to the ON position. Do not attempt to
start the engine.
D. Measure the voltage between J2:14 and J2:28 on the
ECM.
E. Turn the keyswitch to the OFF position.
F. Reconnect the P2 connector.
4.52 to 4.72 V Result: The measured voltage is within the expected range.
The fault is in the sensor signal wire between the secondary
speed/timing sensor and the P2 ECM connector.
Check all wiring between the secondary 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: The measured voltage is not within the expected
range.
Proceed to Test Step 10.
8. Inspect the Sensors
A. Ensure that the speed/timing sensors are correctly seated
in the cylinder block and the front cover and that the retaining
bolts are tightened to the correct torque. Refer to Disassem-
bly and Assembly, “Crankshaft Position Sensor - Remove
and Install” or refer to Disassembly and Assembly, “Camshaft
Position Sensor - Remove and Install”. Ensure that the
speed/timing sensors are not damaged.
B. Replace any damaged sensors. Refer to Disassembly and
Assembly, “Crankshaft Position Sensor - Remove and Install”
or refer to Disassembly and Assembly, “Camshaft Position
Sensor - Remove and Install”.
C. Use the electronic service tool to check if the 637-11 diag-
nostic code is still active.
Diagnostic code Result: A 637-11 diagnostic code is not active at this time.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: A 637-11 diagnostic code is still active at this time.
Proceed to Test Step 9.
(continued)
230 UENR0612-07
Circuit Tests
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