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 provide 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 Voltage - Bank 1 | P0300-P0306, P2300, P2306, P2312 | P0300-P0306 | -- | P0300, P0301, P0303, P0305
Ignition Voltage - Bank 2 | P0300-P0306, P2303, P2309, P2315 | P0300-P0306 | -- | P0300, P0302, P0304, P0306
Ignition Coil 1 Control Circuit | P2300 | P0301 | P2301 | P0300, P0301
Ignition Coil 2 Control Circuit | P2303 | P0302 | P2304 | P0300, P0302
Ignition Coil 3 Control Circuit | P2306 | P0303 | P2307 | P0300, P0303
Ignition Coil 4 Control Circuit | P2309 | P0304 | P2310 | P0300, P0304
Ignition Coil 5 Control Circuit | P2312 | P0305 | P2313 | P0300, P0305
Ignition Coil 6 Control Circuit | P2315 | P0306 | P2316 | P0300, P0306

### Circuit/System Description

The ignition system on this engine uses individual ignition coils and ignition control (IC) circuits for each cylinder. Ignition voltage is supplied to each bank of ignition coils. 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.

The sequencing and timing are ECM controlled.

### Conditions for Running the DTC

• | The engine is operating.

• | The ignition voltage is between 10.5-18 volts.

• | The engine speed is between 600-5,000 RPM.

• | The DTCs run continuously once per crankshaft revolution after the above conditions are met for 20 crankshaft revolutions.

### Conditions for Setting the DTC

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

The ECM detects the ignition control circuit is shorted to ground for greater than 4 seconds or a cumulative of 50 seconds.

#### P2301, P2304, P2307, P2310, P2313, or P2316

The ECM detects the ignition control circuit is shorted to voltage for greater than 4 seconds or a cumulative of 50 seconds.

### Action Taken When the DTC Sets

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

### Conditions for Clearing the DTC

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

### Diagnostic Aids

• | Inspect the ignition coils for aftermarket devices. An aftermarket device connected to the ignition coil circuits, may cause this DTC to set.

• | If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the circuit status for the component with a scan tool. The circuit status parameter changes from OK or Indeterminate to Fault if there is a condition with the circuit or a connection.

### 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 idling for 30 seconds, observe the scan tool DTC information parameter. 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 are captured in the Freeze Frame/Failure Records Data List.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate ignition coil.
2. Test for less than 5 ohms between the low reference circuit terminal B and the ECM housing.

⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit/connection tests normal, replace the ECM.

3. Test for less than 5 ohms between the ground circuit terminal A and ground.

⇒ | If greater than the specified range, repair the open, or high resistance in the ground circuit.

Important: The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition circuit.

4. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal D and ground.

⇒ | If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition voltage circuit and replace as necessary.

5. Crank or start the engine, test for 200-400 mV between the appropriate IC circuit terminal C and ground.

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

⇒ | If greater than the specified range, test the IC circuit for a short to voltage. If the circuit/connection tests normal, replace the ECM.

6. If all circuits/connections test normal, replace the ignition coil.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Ignition Coil Replacement - Bank 1

• | Ignition Coil Replacement - Bank 2

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