P0335
DTC P0335 CRANKSHAFT POSITION SENSOR A CIRCUITComponent Location:
GENERAL DESCRIPTION
The Crankshaft Position Sensor (CKPS) is a hall effect type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft; there are 58 slots in the target wheel where one is longer than the others. When the slot in the wheel aligns with the sensor, the sensor voltage outputs low. When the metal (tooth) in the wheel aligns with the sensor, the sensor voltage outputs high. During one crankshaft rotation there are 58 rectangular signals and one longer signal. The ECM calculates engine RPM by using the sensor's signal and controls the injection duration and the ignition timing. Using the signal differences caused by the longer slot, the ECM identifies which cylinder is at top dead center.
DTC DESCRIPTION
The ECM sets DTC P0335 when the number of crankshaft teeth during one revolution is incorrect or crankshaft signal is missing while camshaft signal is detected.
DTC Detecting Condition:
Schematic Diagram:
Signal Waveform And Data:
MONITOR DTC STATUS
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.
5. Is parameter displayed "History (Not Present) fault"?
NOTE:
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to next step as below
POWER CIRCUIT INSPECTION
1. Ignition "OFF".
2. Disconnect CKP sensor connector.
3. Ignition "ON" & Engine "OFF".
4. Measure voltage between terminal 1 of the sensor harness connector and chassis ground.
Specification : Approx. B+
5. Is voltage within the specification?
YES - Go to "Ground Circuit Inspection" procedure
NO - Check for a open in the power supply circuit between the main relay and the CKPS
Repair as necessary and go to "Verification of Vehicle Repair" procedure
GROUND CIRCUIT INSPECTION
1. Ignition "OFF".
2. Measure resistance between terminal 2 of the sensor harness connector and chassis ground.
Specification : Approx. 0 ohm
3. Is resistance within the specification?
YES - Go to "Signal Circuit Inspection" procedure
NO - Check for an open or short to battery in the ground circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure
SIGNAL CIRCUIT INSPECTION
1. Check for open or short to ground in signal circuit
1. Ignition "ON" & Engine "OFF".
2. Measure voltage between terminal 3 of the sensor harness connector and chassis ground.
Specification : Approx. 5 V
3. Is voltage within the specification?
YES - Go to next step as below
NO - Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short to power in signal circuit
1. Ignition "OFF".
2. Disconnect ECM connector.
3. Ignition "ON" & Engine "OFF".
4. Measure voltage between terminal 3 of sensor harness connector and chassis ground.
Specification : Approx. 0 V
5. Is voltage within the specification?
YES - Go to next step as below
NO - Repair as necessary and go to "Verification of Vehicle Repair" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Go to next step as below
COMPONENT INSPECTION
1. Reconnect the CKPS and ECM connectors
2. Set up an oscilloscope as follows :
Channel A (+): terminal 3 of the CKPS (back probe), (-): Ground
Channel B (+): terminal 3 of the CMPS (back probe), (-): Ground
3. Start the engine and check for signal waveform compared with reference waveform as below.
4. Is the signal waveform normal?
YES - Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Remove CKP and calculate air gap between sensor and flywheel/Torque converter. Readjust as necessary and go to "Verification of Vehicle Repair" procedure
NOTE: Air gap [0.3- 1.7 mm. [0.012 - 0.067 in.]] = measure distance from housing to teeth on flywheel/torque converter (measurement "A") and from mounting surface on sensor to sensor tip (measurement "B" subtract "B" from "A"
- If air gap is OK, check CKPS for contamination, deterioration, or damage. Substitute with a known-good CKPS and check for proper operation. If the problem is corrected, replace CKPS and then go to "Verification of Vehicle Repair" procedure
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History (Not Present) fault"?
YES - System performing to specification at this time. Clear the DTC
NO - Go to the applicable troubleshooting procedure.