Orlando

DTC P0300-P0304 or P0313

The engine control module (ECM) uses information from the crankshaft position sensor in order to determine when an engine misfire is occurring and uses information from the camshaft position sensor - inlet and camshaft position sensor - exhaust sensors in order to determine which cylinder is misfiring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect individual misfire events. If the ECM detects a misfire rate sufficient to cause emission levels to exceed mandated standards, DTC P0300 00 sets. Under certain driving conditions, a misfire rate can be high enough to cause the 3-way catalytic converter to overheat, possibly damaging the converter. The malfunction indicator lamp (MIL) will flash ON and OFF when converter overheating, damaging conditions are present and DTC P0300 00 is set. DTCs P0301 00 - P0304 00 correspond to cylinders 1-4. If the ECM is able to determine that a specific cylinder is misfiring, the DTC for that cylinder will set. If the ECM detects a misfire and low fuel level, DTC P0313 00 is set.

The ECM is detecting a crankshaft rotation speed variation indicating a misfire sufficient to cause emission or catalytic converter damaging levels to exceed mandated standards.

DTCs P0300 00 - P0304 00 and P0313 00 are Type B DTCs.

DTCs P0300 00 - P0304 00 and P0313 00 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-26792 HEI Spark Tester

For equivalent regional tools, refer to Special Tools .

1. Verify that no other DTCs are set.

⇒	If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Engine idling, verify there is no abnormal engine noise.

⇒	If there is abnormal engine noise, refer to Symptoms - Engine Mechanical .

3. If the vehicle passes the circuit/system verification test, operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the freeze frame/failure records lists.

1. Verify that the following conditions do not exist:

•	Low fluid level

•	Engine vacuum leaks

•	Fuel pressure that is too low or too high. Refer to Fuel System Diagnosis .

•	Contaminated fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .

•	Restricted exhaust system. Refer to Restricted Exhaust : Diesel .

⇒	If you find any of the above conditions, repair as necessary.

2. Ignition OFF, disconnect the harness connector from the T8 Ignition Coil.
3. Install a EL-26792 HEI Spark Tester into the position 1 of the T8 Ignition Coil and ground.

Note: An erratic or weak spark is considered a no spark condition.

4. Perform the output control test ignition Coil Test and observe the EL-26792 HEI Spark Tester. The spark tester should spark.
5. Ignition OFF, remove the spark tester and repeat the test for each cylinder.

⇒	If there is no spark, refer to Electronic Ignition System Description for diagnosis of the T8 Ignition Coil.

6. Ignition OFF, inspect each spark plug. If there is a condition with the spark plug, replace the spark plug. Refer to Ignition System Specifications and Spark Plug Inspection .

1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Turn OFF the ignition for 60 s.
5. If the repair was related to a DTC, duplicate the conditions for running the DTC and use the freeze frame/failure records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle
6. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair Verification for DTC P0420 00. Refer to DTC P0420 .