P2311-IGNITION COIL 4 SECONDARY CIRCUIT-INSUFFICIENT IONIZATION

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the engine running and battery voltage greater than 10.4 volts.
Set Condition:
The PCM detects that the secondary ignition burn time is incorrect or not present. One Trip Fault.

Possible Causes

INTERMITTENT DTC

(K344) FUSED MAIN RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

(K15) COIL 4 CONTROL CIRCUIT SHORTED TO GROUND

(K15) COIL 4 CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

IGNITION COIL 4

POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Diagnostic Test

1. DTC IS ACTIVE

Ignition on, engine not running.
With the scan tool, Clear DTCs in the Powertrain Control Module (PCM).
Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

Go to 2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2. (K344) FUSED MAIN RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

Turn the ignition off.
Disconnect the Ignition Coil 4 harness connector.
Turn the ignition on.
Using a 12 volt test light connected to ground, check the (K344) Fused Main Relay Output circuit in the Ignition Coil 4 harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

Go to 3

Repair the (K344) Fused Main Relay Output circuit for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

3. (K15) COIL 4 CONTROL CIRCUIT SHORTED TO GROUND

Turn the ignition off.
Disconnect the Powertrain Control Module (PCM) connector.
Measure the resistance between ground and the (K15) Coil 4 Control circuit in the Ignition Coil 4 harness connector.

Is the resistance below 100 ohms?

Yes

Repair the (K15) Coil 4 Control circuit for a short to ground.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 4

4. (K15) COIL 4 CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K15) Coil 4 Control circuit between the Ignition Coil 4 harness connector and the Powertrain Control Module (PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes

Go to 5

Repair the (K15) Coil 4 Control circuit for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

5. IGNITION COIL 4

Connect the Powertrain Control Module (PCM) connector.
Using a 12 volt test light connected to 12 volts, check the (K15) Coil 4 Control circuit in the Ignition Coil 4 harness connector.
Crank the engine for 5 seconds.

NOTE: The test light should blink each time the circuit is activated by the PCM.

Does the test light blink each time the circuit is activated by the PCM?

Yes

Replace the Ignition Coil 4 in accordance with the Service Information.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 6

6. POWERTRAIN CONTROL MODULE (PCM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Ignition Coil 4 and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes

Repair as necessary.

Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).