P2304
DTC P2304CIRCUIT DESCRIPTION
The engine control module (ECM) controls spark timing and dwell under all engine running conditions. The ignition control module (ICM) has the ability to charge and discharge the coil packs based on ECM control. The ECM uses a high control signal of near 5 volts to charge up the coil and a low control signal of near 0 volts to discharge the coil. If the coil is charged and the control signal is low, the coil will fire through its secondary towers. During engine crank, the ECM will pulse the ignition control (IC) timing control B circuit high and low to test for faults in the IC timing control B circuit.
If the ECM detects an open or a short to voltage in IC timing control circuit, DTC P2304 sets.
CONDITIONS FOR RUNNING THE DTC
This diagnostic runs continuously with the ignition ON.
CONDITIONS FOR SETTING THE DTC
This DTC will set if an open or a short to voltage occurs on the IC timing control B circuit.
ACTION TAKEN WHEN THE DTC SETS
- The control module stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
- The driver information center, if equipped, may display a message.
CONDITIONS FOR CLEARING THE DTC
- 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 non-emission related diagnostic.
- Clear the DTC with a scan tool.
DIAGNOSTIC AIDS
An open or a short to voltage on the IC timing control B circuit will cause a misfire on both cylinders 2 and 3. Monitor the Misfire Current Cylinders and 3 with the scan tool to help locate an intermittent condition. Refer to Intermittent Conditions. Intermittent Conditions
TEST
