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 P2300: Ignition Coil 1 Control Circuit Low Voltage
DTC P2301: Ignition Coil 1 Control Circuit High Voltage
DTC P2303: Ignition Coil 2 Control Circuit Low Voltage
DTC P2304: Ignition Coil 2 Control Circuit High Voltage
DTC P2306: Ignition Coil 3 Control Circuit Low Voltage
DTC P2307: Ignition Coil 3 Control Circuit High Voltage
DTC P2309: Ignition Coil 4 Control Circuit Low Voltage
DTC P2310: Ignition Coil 4 Control Circuit High Voltage
DTC P2312: Ignition Coil 5 Control Circuit Low Voltage
DTC P2313: Ignition Coil 5 Control Circuit High Voltage
DTC P2315: Ignition Coil 6 Control Circuit Low Voltage
DTC P2316: Ignition Coil 6 Control Circuit High Voltage

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Ignition 1 Voltage | * | ** | -- | --
Ignition Coil 1 Control Circuit | P0301, P2300 | P0301, P2300 | P0301, P2301 | --
Ignition Coil 2 Control Circuit | P0302, P2303 | P0302, P2303 | P0302, P2304 | --
Ignition Coil 3 Control Circuit | P0303, P2306 | P0303, P2306 | P0303, P2307 | --
Ignition Coil 4 Control Circuit | P0304, P2309 | P0304, P2309 | P0304, P2310 | --
Ignition Coil 5 Control Circuit | P0305, P2312 | P0305, P2312 | P0305, P2313 | --
Ignition Coil 6 Control Circuit | P0306, P2315 | P0306, P2315 | P0306, P2316 | --
Ground Circuit | -- | -- | -- | --
* The Engine Cranks but Does Not Run and opens the fuse that supplies voltage to the ignition coils. ** The Engine Cranks but Does Not Run.

### Circuit/System Description

Ignition 1 voltage is supplied to the ignition coils. The engine control module (ECM) provides a ground for the ignition coil (IC) control circuits. When the ECM removes the ground path of the ignition primary coil, the magnetic field produced by the coil collapses. The collapsing magnetic field produces a voltage in the secondary coil which ignites the spark plugs. The sequencing and timing are controlled by the ECM.

### Conditions for Running the DTC

• | DTCs P0016 and P0340 are not set.

• | The engine speed is greater than 512 RPM.

• | The engine coolant temperature (ECT) is greater than 21°C (69°F).

• | The ignition 1 voltage is between 10-16 volts.

• | The DTCs run continuously once the above condition is met.

### Conditions for Setting the DTC

The ECM detects an open, short to ground, or a short to voltage on the IC circuit.

### Action Taken When the DTC Sets

DTCs P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, and P2316 are Type A DTCs.

### Conditions for Clearing the DTC

DTCs P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, and P2316 are Type A DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Electronic Ignition (EI) System Description

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Engine running, observe the DTC information with a scan tool. DTCs P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, and P2316 should not set.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate ignition coil.
2. Test for less than 5 ohms of resistance between the ground circuit terminal B and ground.

⇒ | If greater than the specified range, test the ground circuit of the ignition coil for an open/high resistance.

3. Ignition ON, command the fuel pump relay ON with a scan tool. Test for B+ between the ignition 1 voltage circuit terminal C and ground.

⇒ | If less than B+, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary.

Important: Set the DMM to the AC Hertz scale for this test.

4. Engine running, verify the frequency is greater than 10 Hz between the appropriate ignition control circuit terminal A and ground.

⇒ | If less than the specified range, test the ignition control circuit for a short to voltage, short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

5. If all circuits test normal, test or replace the ignition coil.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Ignition Coil Replacement

• | Control Module References for engine control module replacement, setup, and programming