Circuit Description
The crankshaft position sensor is a 'Hall-effect' type sensor that monitors crankshaft position and speed. There are four teeth 90° apart on the front of the crankshaft sprocket that 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 crankshaft. This is a type A DTC.
Conditions for Setting the DTC
| • | RPM less than 300. |
| • | 8 consecutive cam pulses missing for 8 #1 cylinder events. |
or
| • | RPM greater than or equal to 300. |
| • | 8 consecutive cam pulses missing for 32 #1 cylinder events. |
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 when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (160°F) that same ignition cycle. |
| • | Use of a Scan Tool |
Diagnostic Aids
When PCM is in backup fuel, long crank times, fast idle and poor performance conditions will exist. Check for good connection at crankshaft position sensor and at PCM. Many intermittent problems are caused by faulty electrical connections or wiring. When attempting to diagnoses 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 it near rpm that the problem occurs. Since heat and vibration are often the cause of intermittent, this may bring out the failure.
Test Description
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 DTCs use the scan tool Capture Info to record freeze frame and failure records for reference, as data will be lost when Clear Info function is used. Was the On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 |
Does scan tool display specified value? | 8 | ||
3 | DTC is intermittent. If no additional DTCs are stored, refer to the Applicable DTC Table(s) first. Are additional DTCs stored? | -- | Go to the Applicable DTC Table | Go to Diagnostic Aids |
4 |
Is voltage at the specified value? | 5 V | ||
5 | Probe the sensor ground circuit with a test light connected to B+. Is test light ON? | -- | ||
6 |
Is voltage at the specified value? | 4 V | ||
7 |
Was the Crankshaft position sensor 5 volt reference circuit open or shorted to ground? | -- | ||
8 |
Was a repair performed? | -- | ||
9 | Check the Crankshaft position sensor 5 volt reference circuit for a poor connection at the PCM and replace terminal if necessary. Did the terminal require replacement? | -- | ||
10 |
Was the Crankshaft position sensor signal circuit open or shorted to ground? | -- | ||
11 | Check the Crankshaft position sensor signal circuit for a poor connection at the PCM and replace terminal if necessary. Did the terminal require replacement? | -- | ||
12 | Replace the Crankshaft position sensor. Refer to Crankshaft Position Sensor Replacement . If the Crankshaft Position Sensor is malfunctioning, 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 malfunctioning 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 | Using the scan tool, select Capture Info, Review Info. Are any DTCs displayed that have not been diagnosed? | -- | Go to the Applicable DTC Table | System OK |
