Technical Description of OBD-II Trouble Code
Malfunction in Cylinder 7 Injector Circuit
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code that is applicable to vehicles equipped with OBD-II. Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
P0207 indicates that the PCM has detected a fault in the injector or the wiring connected to the injector. The PCM monitors the injector and expects to see the voltage pulled “low” or close to zero when the injector is activated.
When the injector is switched off, the PCM expects to see a voltage close to battery voltage or “high”. If the expected voltage is not detected, the PCM will set this code. The PCM also monitors the resistance in the circuit and will set this code if the resistance is excessively low or high.
Potential Symptoms
The symptoms associated with this code are likely to include a misfire and a rough running engine, as well as poor acceleration. The MIL (Malfunction Indicator Lamp) will also be illuminated.
Causes
The potential causes of a P0207 engine light code could be any of the following:
Faulty injector. This is usually the primary cause of this code, but it does not rule out the possibility of one of the other causes.
Open circuit in the wiring connected to the injector
Short circuit in the wiring connected to the injector
Defective PCM
Possible Solutions
First, use a DVOM (Digital Volt-Ohm Meter) to check the resistance of the injector. If the resistance is not within specifications, then replace the injector.
Check for voltage at the fuel injector connector. It should have a voltage of 10 volts or more.
Visually inspect the connector for any damage or broken wires.
Visually inspect the injector for any damage.
If you have access to an injector tester, activate the injector and observe if it operates properly. If the injector operates correctly, then you likely have either an open circuit in the wiring or a blocked injector. If you do not have access to a tester, swap the injector with another one and see if the code changes. If the code changes, then replace the injector.
At the PCM, remove the driver wire from the PCM connector and ground the wire. (Make sure you have identified the correct wire. If you are unsure, do not attempt this step) The injector should activate.
Replace the injector
