Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

1) ACTIVE DTC
Crank the engine.

Ignition on, engine not running.

With a scan tool, read DTCs.

Is the DTC active at this time?

Yes
1. Go To 2).
No
1. Go To 14).
2) (F855) 5-VOLT SUPPLY CIRCUIT

Fig 1: Checking Crankshaft Position Sensor 5-Volt Supply Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the CKP Sensor harness connector.

Ignition on, engine not running.

Measure the voltage on the (F855) 5-volt Supply circuit in the CKP Sensor harness connector.

Is the voltage between 4.5 and 5.2 volts?

Yes
1. Go To 3).
No
1. Go To 10).
3) (K24) CKP SIGNAL CIRCUIT

Fig 2: Checking Crankshaft Position Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the voltage on the (K24) CKP Signal circuit in the CKP Sensor harness connector.

Is the voltage between 4.5 and 5.0 volts?

Yes
1. Go To 4).
No
1. Go To 7).
4) (K900) SENSOR GROUND CIRCUIT OPEN

Fig 3: Checking Crankshaft Position Sensor Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the PCM harness connectors.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (K900) Sensor ground circuit from the CKP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go To 5).
No
1. Repair the open in the (K900) Sensor ground circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
5) (K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Fig 4: Checking Crankshaft Position Sensor Signal Circuit & 5-Volt Supply Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between the (K24) CKP Signal circuit and the (F855) 5-volt Supply circuit in the CKP Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Repair the short between the (K24) CKP Signal circuit and the (F855) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 6).
6) CRANKSHAFT POSITION SENSOR
NOTE: Inspect the slots on the flywheel for damage. If a problem is found repair as necessary.

If there are no possible causes remaining, view repair.

Repair
1. Replace the Crankshaft Position Sensor.
2. Perform POWERTRAIN VERIFICATION TEST .
7) (K24) CKP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Fig 5: Checking Crankshaft Position Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the PCM harness connectors.

Ignition on, engine not running.

Measure the voltage on the (K24) CKP Signal circuit in the CKP Sensor harness connector.

Is the voltage above 5.2 volts?

Yes
1. Repair the short to battery voltage in the (K24) CKP Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 8).
8) (K24) CKP SIGNAL CIRCUIT OPEN

Fig 6: Checking Crankshaft Position Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (K24) CKP Signal circuit from the CKP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go To 9).
No
1. Repair the open in the (K24) CKP Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
9) (K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND

Fig 7: Checking Crankshaft Position Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (K24) CKP Signal circuit in the CKP Sensor harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Repair the short to ground in the (K24) CKP Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 13).
10) (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE

Fig 8: Checking Crankshaft Position Sensor 5-Volt Supply Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the PCM harness connectors.

Ignition on, engine not running.

Measure the voltage on the (F855) 5-volt Supply circuit in the CKP Sensor harness connector.

Is the voltage above 5.5 volts?

Yes
1. Repair the short to battery voltage in the (F855) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 11).
11) (F855) 5-VOLT SUPPLY CIRCUIT OPEN

Fig 9: Checking Crankshaft Position Sensor 5-Volt Supply Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (F855) 5-volt Supply circuit from the CKP Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go To 12).
No
1. Repair the open in the (F855) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
12) (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 10: Checking Crankshaft Position Sensor 5-Volt Supply Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (F855) 5-volt Supply circuit in the CKP Sensor harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (F855) 5-volt Supply circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 13).
13) PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

If there are no possible causes remaining, view repair.

Repair
1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .
14) ERRATIC CKP SENSOR SIGNAL
Turn the ignition off.

With a lab scope probe and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the CKP harness connector.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Ignition on, engine not running.

Wiggle the related wire harness and lightly tap on the Crank Position Sensor.

Observe the lab scope screen.

Look for any pulses generated by the CKP Sensor.

Allow the engine to idle.

Observe the lab scope screen.

Did the CKP Sensor generate any erratic pulses?

Yes
1. Inspect the related wire harness and replace the Crankshaft Position Sensor if no wiring problems were found.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 15).
15) ERRATIC CMP SIGNAL
Turn the ignition off.

With a lab scope probe and the Miller special tool #6801, backprobe the (K44) CMP Signal circuit in the CMP harness connector.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Ignition on, engine not running.

Wiggle the related wire harness and lightly tap on the Cam Position Sensor.

Observe the lab scope screen.

Look for any pulses generated by the CMP Sensor.

Allow the engine to idle.

Observe the lab scope screen.

Did the CMP Sensor generate any pulses?

Yes
1. Inspect the related wire harness and replace the Camshaft Position Sensor if no wiring problems were found.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Test Complete.