For 1990-2009 cars

### Diagnostic Instructions

• | 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.

### DTC Descriptors

DTC P0314: Single Cylinder Engine Misfire Detected

### Circuit/System Description

The engine control module (ECM) uses information from the crankshaft position (CKP) sensor to determine when an engine misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect individual misfire events. The camshaft position (CMP) sensor is used to identify which cylinder is misfiring if a majority of the misfire occurs on the same cylinder. If there is a camshaft position (CMP) sensor error, misfire will be detected but the specific cylinder cannot be identified.

### Conditions for Running the DTC

The engine is running.

### Conditions for Setting the DTC

The ECM detects that a misfire is present with a CMP sensor error.

### Action Taken When the DTC Sets

DTC P0314 is a Type A (MIL flashing) or Type B DTC.

### Conditions for Clearing the DTC

DTC P0314 is a Type A (MIL flashing) or Type B DTC.

### Reference Information

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Engine running, observe the DTC information with a scan tool. DTCs P0016 or P0340 should not set.

⇒ | If DTC P0016 or P0340 are set, refer to DTC P0016 or P0340.

⇒ | If DTC P0300 is set, refer to DTC P0300-P0304.