Circuit Description
The crankshaft position sensor is a Hall-effect type of sensor which monitors the crankshaft position and the speed. There are four teeth 90° apart on the front of the crankshaft sprocket which induce a pulse in the sensor which is transmitted to the PCM. There is a physical one to one correspondence between the pump cam and the crankshaft. This is a type A DTC.
Conditions for Setting the DTC
| • | Eight consecutive crank pulses are missing. |
| • | An average of eight consecutive crank pulses are missing. |
Action Taken When the DTC Sets
Backup fuel
Conditions for Clearing the MIL/DTC
| • | The PCM will turn the MIL off after three consecutive trips without a fault condition. |
| • | A History DTC will clear after forty consecutive warm-up cycles during which the diagnostic does not fail (the coolant temperature has risen 5°C (40°F) from the start up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle). |
| • | Use of a Scan Tool will clear the DTC codes. |
Diagnostic Aids
When the PCM is in backup fuel, long crank times, fast idle and poor performance conditions will exist. Check for a good connection at the crankshaft position sensor and at the PCM. Many intermittent problems are caused by poor electrical connections or wiring. When attempting to diagnose an intermittent problem, always begin by trying to reproduce the conditions under which the failure occurs. This usually involves raising the engine to a higher temperature or operating the engine near the RPM where the problem occurs. Since heat and vibration are often the cause of the intermittent, this may bring out the failure.
Test Description
The number(s) below refer to the Step number(s) on the Diagnostic Table.
-
This Step will determine if DTC P0335 is the result of a hard failure or an intermittent condition.
-
This Step checks the 5 volt reference circuit (the 5 volt reference may vary slightly).
-
This Step checks the ground circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing the DTCs, use the Scan Tool Capture Info in order to record the Freeze Frame and the failure records for reference, as the data will be lost when the Clear Info function is used. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 |
Does the Scan Tool display the specified value? | 8 | ||
3 | The DTC is intermittent. If no additional DTCs are stored, refer to the Applicable DTC Table(s) first. Are there any additional DTCs stored? | -- | Go to the Applicable DTC Table | Go to Diagnostic Aids |
4 |
Is the voltage within the specified range? | 4.8-5.2V | ||
5 | Probe the sensor ground circuit with a test light connected to B+. Is the test light ON? | -- | ||
6 |
Is the voltage greater than or equal to the specified value? | 4V | ||
7 |
Was a repair performed? | -- | ||
8 |
Was a repair performed? | -- | ||
9 | Check the CKP 5 volt reference circuit for a poor connection at the PCM and replace the terminal if necessary. Did the terminal require replacement? | -- | ||
10 |
Was a repair performed? | -- | ||
11 | Check the CKP signal circuit for a poor connection at the PCM and replace the terminal if necessary. Did the terminal require replacement? | -- | ||
12 | Replace the Crankshaft position sensor. Refer to Crankshaft Position (CKP) Sensor Replacement . After replacing the Crankshaft Position Sensor, the PCM must be programmed with a new TDC Offset. Refer to Fuel Injection Pump Top Dead Center Offset Adjustment . Is the action complete? | -- | -- | |
13 | Replace the PCM. Important: If the PCM is malfunctioning, the new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | |
14 |
Does the scan tool indicate that this diagnostic Ran and Passed? | -- | ||
15 | Use the Scan Tool in order to select Capture Info, Review Info. Are there any DTCs displayed that have not been diagnosed? | -- | Go to the Applicable DTC Table | System OK |
