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Error Code P1300 is defined as Igniter Circuit Malfunction No. 1. It means there is no IGF signal to the PCM during engine operation.
This error code is a manufacturer-specific trouble code – it does not apply to all vehicles equipped with OBD-II system or vehicles made since 1996 up to present. Rather, it applies to select manufacturers, such as Toyota. Specifications on the definition, troubleshooting, and repairs still vary from one manufacturer to another.
The DIS or Direct Ignition System is a 1-cylinder ignition system that ignites one cylinder with one ignition coil. The ignitor is an essential component for the ignition coil. The PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) determines the timing of the ignition outputs of the ignition signal (IGT) for each cylinder. Based on the signal it receives from the IGT, power transistors in the ignitor cut-off current to the primary coil in the ignition coil, causing the latter to fire the spark plug. After delivering a command to turn off the primary circuit on the IGT wire, the PCM monitors IGF circuit to ensure first switching occurred.
Error Code P1300 happens when the there is no IGF signal to the PCM the engine is running.
As with other error codes, this code activates the Check Engine light and registers the error code. It doesn’t usually come with drivability issues. In some cases, the vehicle may suffer from hard starting.
There are multiple factors for this code to appear. These possible causes include:
- Defective ignition coil no. 1
- Open or shorted ignition coil no. 1 harness
- Poor electrical connection in the ignition coil
- Faulty PCM
How to Check
Error Code P1300 is considered as a general misfire condition, which can be potentially damaging to the CAT (catalytic converter). The best way to diagnose for this error code is to use Tech2 scanner, as it records freeze frame data at the point of the misfire, helping you to diagnose the problem.
Other components you need to check are the spark plugs, either NGK BCPR7ES11 or PFR6H11; both gapped to 0.9-1mm.
If you’re experiencing hard starting when warm, then it may be CPS (crank position sensor). If that is the case, check the rev counter. If it’s not moving as you crank the engine, then the CPS is at fault in this situation. You can also measure its resistance, which should be a little over 1000 ohms. Faulty CPS will be much higher.
How to Fix
Some common repairs for this error code include:
- Replacement of ignition coil no. 1
- Repair or replacement of ignition coil no.1 harness
- Repair or replacement of ignition coil no.1 electrical connection
- Upgrade or replacement of PCM
Use the Tech2 to go through the fault codes and their proper diagnosis procedure on the workshop system.