• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5-Volt Reference Circuit | P0335, P0651, P2135 | P0335, P0336 | P0651 | -- |
CKP Sensor Signal Circuit | P0335 | P0335 | P0335 | -- |
Low Reference Circuit | P0335 | P0335 | -- | -- |
The crankshaft position (CKP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit and an output signal circuit. The CKP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 58-tooth reluctor wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at 60-tooth spacing, with 2 missing teeth for the reference gap. The CKP sensor produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The frequency of the CKP sensor output depends on the velocity of the crankshaft. The CKP sensor sends a digital signal, which represents an image of the crankshaft reluctor wheel, to the ECM as each tooth on the wheel rotates past the CKP sensor. The ECM uses each CKP signal pulse to determine crankshaft speed and decodes the crankshaft reluctor wheel reference gap to identify crankshaft position. This information is then used to sequence the ignition timing and fuel injection events of the engine. The ECM also uses CKP sensor output information to determine the camshaft relative position to the crankshaft, to control the camshaft actuator, and to detect cylinder misfire
• | DTC P0340, P0341, P0641 or P0651 is not set. |
• | The engine is cranking or running. |
• | The DTC runs continuously when the above conditions are met. |
Important: The ECM detects engine movement by sensing the airflow through the mass air flow (MAF) sensor is more than 3 g/s, or by sensing CMP sensor pulses.
• | The ECM detects that the starter is commanded on and the engine has been cranking for more than 4 seconds without a CKP sensor pulse. |
OR |
• | The ECM detects that the engine has been running, but has not received a CKP sensor pulse for 2 of 10 engine revolutions. |
DTC P0335 is a Type B DTC.
DTC P0335 is a Type B DTC.
Electronic Ignition (EI) System Diagnosis
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
• | Close routing of aftermarket electrical equipment |
• | Close to solenoids, motors, and relays |
⇒ | Correct any wire harness routing or component placement conditions, if it is determined to be a possible source of electrical interference. |
⇒ | If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified range, test the affected signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the affected signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If the CKP Active Counter parameter does not increment, replace the ECM. |
⇒ | If the circuits test normal replace the CKP sensor. |
Important: You must perform the Circuit/System Testing before proceeding with Component Testing.
⇒ | If the sensor is loose, incorrectly installed, or damaged, repair or replace the CKP sensor. |
⇒ | If the parameter does not increment, replace the CKP sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.