TP-6903 5/16a Electrical System and Sensor Troubleshooting 65
Figure 4-8 Crankshaft Position Sensor Troubleshooting
Action Yes No
Check the battery connections, the battery, and engine grounds.
Are the power ground terminals clean and tight?
Go to the next step.
Repair the circuit as
necessary.
Turn the ECM power OFF.
Disconnect ECM connector.
Disconnect Crankshaft Position Sensor (CKP) connector.
Using a DVOM, check for continuity between the following:
CKP connector pin A and P26 pin 47.
CKP connector pin B and P26 pin 48.
Does the DVOM show continuity?
Go to the next step.
Repair the open circuit
as necessary.
Using a DVOM, check for continuity between the following:
CKP connector pin A and engine ground.
CKP connector pin B and engine ground.
Does the DVOM show continuity?
Repair the shorted
circuit as necessary.
Go to the next step.
Replace crankshaft position sensor. Refer to Section 5.3.
Is the replacement complete?
Go to the next step. -
Remove all test equipment except Spectrum.
Connect any disconnected components.
Using Spectrum, clear DTC information from the ECM.
Turn the ECM power OFF and wait 30 seconds.
Start the engine and operate to full operating temperature.
Observe the engine performance.
After operating the engine, check for any stored codes.
Does the engine operate normally with no stored codes?
The system is OK. Go to the next step.
Replace the ECM. Refer to Section 5.4.
Is the replacement complete?
Go to the next step.
Remove all test equipment except Spectrum.
Connect any disconnected components.
Using Spectrum, clear DTC information from the ECM.
Turn the ECM power OFF and wait 30 seconds.
Start the engine and operate to full operating temperature.
Observe the engine performance.
After operating the engine, check for any stored codes.
Does the engine operate normally with no stored codes?
The system is OK.
Restart the crankshaft
position sensor
troubleshooting
procedure. Look for
other DTC codes
stored in the ECM.
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