P0350
DTC P0350 IGNITION COIL PRIMARY / SECONDARY CIRCUITComponent Location:
COMPONENT LOCATION
GENERAL DESCRIPTION
With the ignition switch in the ON or START position, voltage is applied to the ignition coil.Each ignition coil consists of two coils. High tension leads go to each cylinder from the ignition coils.The ignition coils fire two spark plugs on every power stroke (the cylinder under compression and the cylinder on the exhaust stroke). The Powertrain Control Module (PCM) provides a switching circuit to ground for energizing the primary ignition coils. The PCM uses the crankshaft position sensor and camshaft position sensor signal to time the energizing of the coil. When a primary ignition coil is energized and de-energized, the secondary coil produces a high voltage spike to the attached spark plugs.
DTC DESCRIPTION
If there is no voltage at either of 2 ignition coil group during 32 ignitions, the PCM determines that a fault exists and a DTC is stored.
DTC Detecting Condition:
Schematic Diagram:
TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical Systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to " Power Circuit Inspection " procedure.
POWER SUPPLY CIRCUIT INSPECTION
1. Check voltage
1. Ignition "OFF"
2. Disconnect Ignition sensor connector.
3. Ignition "ON" & Engine"OFF"
4. Measure voltage between terminal 4 of each ignition coil harness connector and chassis ground.
Specification: Approx. B+
5. Is the measured voltage within specification?
YES: Go to "Ground Circuit Inspection" procedure.
NO: Go to "Check for open in harness" as below.
GROUND CIRCUIT INSPECTION
1. Check for open in harness
1. Ignition "OFF"
2. Disconnect ignition coil connectors.
3. Measure resistance between terminal "2" of each ignition coil harness connectors and chassis ground.
Specification: Approx. below 1 Ohms
4. Is the measured resistance within specifications?
YES: Go to "Control Circuit Inspection " procedure.
NO:
- Check for open in harness.
- Check that Gil is firmly tightened.
- Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
CONTROL CIRCUIT INSPECTION
1. Check for short to battery in harness
1. Ignition "OFF"
2. Disconnect each ignition coil connector.
3. Measure resistance between terminal "1" and "3" of each ignition coil harness connector.
Specification: Infinite
4. Is the measured resistance within specification?
YES: Go to "Check for short to ground" in harness.
NO:
- Check for short to battery in harness.
- Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
2. Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect each ignition coil connector.
3. Measure resistance between terminal "3" of each ignition coil harness connector and chassis ground.
Specification: Infinite
4. Is the measured resistance within specification?
YES: Go to "Check for open in harness" as below.
NO:
- Check for short to ground in harness.
- Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
3. Check for open in harness
1. Ignition "OFF"
2. Disconnect each ignition coil connector and PCM connector.
3. Measure resistance between terminal "3" of each ignition coil harness connectors and A16/A15/A17 of the PCM harness connector.
Specification: Approx. below 1 Ohms
4. Is the measured resistance within specifications?
YES: Go to "Component Inspection" procedure.
NO:
- Check for open in harness.
- Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. Check Spark Plug Cable
1. Visually/physically inspect the following items:
- Damage, cracks and flashover
2. Measure the resistance of the spark plug cable
Specification: 448 - 6.72 kOhms/m (3.28 ft) at 20 °C (68 °F)
3. Is the measured resistance within specifications?
YES: Go to "Check Spark Plug" as below.
NO: Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check Spark Plug
1. Ignition "OFF"
2. Disconnect Spark Plug Cable and remove Spark Plug.
3. Measure Spark Plug Gap using a wire gap gauge.
Specification: 1.0 - 1.1 mm (0.039 - 0.043 inch)
4. Is the measured resistance within specifications?
YES: Go to "Check Ignition Coil" as below.
NO: Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
3. Check Ignition Coil
1. Ignition "OFF"
2. Disconnect Ignition Coil connector.
3. Measure the secondary coil resistance between the high-voltage terminals of the ignition coil.
Specification: Approx. 20 (kOhms) (20 °C (68 °F))
4. Is the measured resistance within specifications?
YES:
- Substitute with a known - good PCM and check for proper operation.
- If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
NO:
- Substitute with a known - good Ignition Coil and check for proper operation.
- If the problem is corrected, replace Ignition Coil and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Monitor that all readiness tests have been verified as " Complete"
5. Are any DTCs present?
YES: Go to the applicable troubleshooting procedure.
NO: System is performing to specification at this time.