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Crankshaft Position Sensor Signal Faulty







2045-CRANKSHAFT POSITION SENSOR SIGNAL FAULTY

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the engine cranking or running

- Set Condition:
The Engine Control Module (ECM) does not receive a signal from the Crankshaft Position Sensor when the Camshaft Position Sensor indicates engine rpm.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. VERIFY ACTIVE DTC

NOTE: The Timing Belt/Chain must be correctly installed and operational before diagnosis can be made. Refer to the Service Information to ensure the timing belt is properly installed.

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Turn the ignition on.
With the scan tool, erase the ECM DTCs.
Attempt to start the engine cranking the engine for at least 7 seconds.
With the scan tool, read the ECM DTCs.
Does the scan tool display this DTC?

Yes

- Go To 3

No

- Go To 2

2. TEST DRIVE
With the scan tool, erase the ECM DTCs.
Test drive the vehicle.
With the scan tool, read the ECM DTCs.
Does the scan tool display this DTC?

Yes

- Go To 3

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Component Tests and General Diagnostics

3. CHECKING CRANKSHAFT POSITION SENSOR SIGNAL CKT
Turn the ignition off.
Disconnect the Crankshaft Position Sensor harness connector.
Turn the ignition on.
Measure the voltage of the CKP Sensor Signal circuit at the CKP Sensor harness connector.
Select the appropriate voltage reading.

Voltage is above 5.4 volts.

- Go To 4

Voltage is between 4.7 and 5.4 volts.

- Go To 5

Voltage is below 4.7 volts.

- Go To 12

4. CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of the CKP Position Sensor Signal circuit at the CKP Sensor harness connector.
Is the voltage below 1.0 volt?

Yes

- Replace and program the Engine Control Module.
- Perform the ECM Verification Test Ver. 1.Verification Tests

No

- Repair the Crankshaft Position Sensor Signal circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1.Verification Tests

5. CHECKING CKP 5-VOLT SUPPLY CIRCUIT
Measure the voltage of the CKP Sensor 5-Volt Supply circuit at the CKP Sensor harness connector.
Select the appropriate voltage reading.

Voltage is above 5.4 volts.

- Repair the CKP 5-Volt Supply circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1.Verification Tests

Voltage is between 4.7 and 5.4 volts.

- Go To 6

Voltage is below 4.7 volts.

- Go To 9

6. CKP SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Connect one end of a jumper wire to the ECT Sensor signal circuit in the ECT Sensor harness connector.
Connect the other end of the jumper wire to the CKP Sensor Ground circuit in the Crankshaft Position Sensor harness connector.
Turn the ignition on.
With the scan tool in Engine, Sensors, read the Engine Coolant Temp volts.
Is the voltage below 0.5 volt?

Yes

- Go To 8

No

- Go To 7

7. CKP SENSOR GND CKT OPEN
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the CKP Sensor Ground circuit between the CKP Sensor harness connector and the ECM harness connector.
Is the resistance below 10.0 ohms?

Yes

- Replace and program the ECM.
- Perform the ECM Verification Test Ver. 1.Verification Tests

No

- Repair the CKP Sensor Ground circuit for an open.
- Perform the ECM Verification Test Ver. 1.Verification Tests

8. DAMAGED CKP SENSOR OR CRANKSHAFT
Turn the ignition off.
Remove the CKP Sensor.
Inspect the CKP Sensor for conditions such as loose mounting screws, damage, or cracks.
Inspect the Crankshaft for conditions such as damage, debris or cracked teeth.
Is there any evidence of these conditions?

Yes

- Repair as necessary.
- Perform the ECM Verification Test Ver. 1.Verification Tests

No

- Replace the Crankshaft Position Sensor.
- Perform the ECM Verification Test Ver. 1.Verification Tests

9. CKP 5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance of the CKP Sensor 5-Volt Supply circuit between the ECM harness connector and the CKP Sensor harness connector.
Is the resistance below 10.0 ohms?

Yes

- Go To 10

No

- Repair the CKP Sensor 5-Volt Supply circuit for an open.
- Perform the ECM Verification Test Ver. 1.Verification Tests

10. CKP 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the CKP Sensor 5-Volt Supply circuit at the CKP Sensor harness connector.
Is the resistance above 1000 ohms?

Yes

- Go To 11

No

- Repair the CKP Sensor 5-Volt Supply circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1.Verification Tests

11. CKP 5-VOLT SUPPLY CIRCUIT SHORTED TO THE CKP SENSOR GROUND CIRCUIT
Measure the resistance between the CKP Sensor 5-Volt Supply circuit and the CKP Sensor Ground circuit at the CKP Sensor harness connector.
Is the resistance above 1000 ohms?

Yes

- Replace and program the Engine Control Module.
- Perform the ECM Verification Test Ver. 1.Verification Tests

No

- Repair the CKP Sensor 5-Volt Supply and CKP Sensor Ground circuits for a short together.
- Perform the ECM Verification Test Ver. 1.Verification Tests

12. CKP SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the CKP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the CKP Sensor Signal circuit between the ECM harness connector and the CKP Sensor harness connector.
Is the resistance below 10.0 ohms?

Yes

- Go To 13

No

- Repair the CKP Sensor Signal circuit for an open
- Perform the ECM Verification Test Ver. 1.Verification Tests

13. CKP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the CKP Sensor Signal circuit at the CKP Sensor harness connector.
Is the resistance above 1000 ohms?

Yes

- Go To 14

No

- Repair the CKP Sensor Signal circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1.Verification Tests

14. CKP SENSOR SIGNAL CIRCUIT SHORTED TO THE CKP SENSOR GROUND CIRCUIT
Measure the resistance between the CKP Sensor Signal circuit and the CKP Sensor Ground circuit at the CKP Sensor harness connector.
Is the resistance above 1000 ohms?

Yes

- Replace and program the Engine Control Module.
- Perform the ECM Verification Test Ver. 1.Verification Tests

No

- Repair the CKP Signal circuit and the CKP Sensor Ground circuit for a short together.
- Perform the ECM Verification Test Ver. 1.Verification Tests

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