P2306

DTC P2300, P2303, P2306, P2309, P2312, or P2315

Circuit Description

The ignition system on this engine uses individual ignition coils and ignition control (IC) circuits for each cylinder. The engine control module (ECM) controls the ignition system operation. The ECM controls each coil using the IC circuits. The ECM commands the IC circuit low when a spark event is requested. Each ignition coil is supplied the following circuits:

* The ignition control circuit
* The ignition 1 voltage circuit
* Two ground circuits

The sequencing and timing are ECM controlled. If the ECM detects the ignition control circuit is shorted to ground, this DTC sets.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC P2300 Ignition Coil 1 Control Circuit Low Voltage
* DTC P2303 Ignition Coil 2 Control Circuit Low Voltage
* DTC P2306 Ignition Coil 3 Control Circuit Low Voltage
* DTC P2309 Ignition Coil 4 Control Circuit Low Voltage
* DTC P2312 Ignition Coil 5 Control Circuit Low Voltage
* DTC P2315 Ignition Coil 6 Control Circuit Low Voltage

Conditions for Running the DTC

* The engine is operating.
* The engine speed is between 600-5,000 RPM.
* The ignition voltage is between 10.5-18 volts.
* This DTC runs continuously once the above conditions are met.

Conditions for Setting the DTC

* The ECM detects the ignition control circuit is shorted to ground.
* The above condition is present for less than 4 seconds.

Action Taken When the DTC Sets

* The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
* The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

* The control module turns OFF the malfunction indicator lamp (MIL) after 4 consecutive ignition cycles that the diagnostic runs and does not fail.
* A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
* A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
* Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

* Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
* The lower connector of the ECM is connector C1 and the upper connector of the ECM is connector C2. Refer to Engine Controls Component Views.
* Inspect the ignition coils for aftermarket devices. An aftermarket device connected to the ignition coil circuits, may cause this DTC to set.
* For an intermittent condition, Refer to Intermittent Conditions. Intermittent Conditions

Test Description

Step 1 - Step 10:

Step 11 - Step 15:

The number below refers to the step number on the diagnostic table.
4. This step tests that the ECM is commanding the ignition coil ON and OFF via the ignition control circuit. If the frequency is not between 3-20 Hz, test the ignition control circuit for a short to ground.