P0207

CIRCUIT DESCRIPTION
The fuel injector control module supplies the voltage for each fuel injector. The fuel injector ignition voltage circuit is Pulse Width Modulated (PWM), between 20 volts at idle, to approximately 93 volts in order to compensate for increased engine load and RPM. The fuel injector control module energizes each fuel injector by grounding the command circuit between the fuel injector control module and the fuel injector. The fuel injector control module monitors the status of the ignition voltage circuits and the fuel injector command circuits. When a fuel injector circuit condition is detected by the fuel injector control module, all of the fuel injectors on the affected ignition voltage circuit will be disabled. If a circuit condition is detected on a fuel injector circuit for cylinders 1, 4, 6, or 7, DTCs P0201, P0204, P0206, P0207 will set, along with DTC P1261. If a circuit condition is detected on a fuel injector circuit for cylinders 2, 3, 5, or 8, DTCs P0202, P0203, P0205, P0208 will set, along with DTC P1262.

CONDITIONS FOR RUNNING THE DTC
^ DTCs U1800, and U2104 are not set.
^ The engine is running.
^ The system voltage is between 6-18 volts.

CONDITIONS FOR SETTING THE DTC
^ The fuel injector control module detects an incorrect current on a fuel injector circuit.
^ The condition exists for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
^ The Malfunction Indicator Lamp (MIL) is turned ON.
^ A DTC is stored in memory.
^ The Freeze Frame/Failure Records are stored.
^ The Failure Records are updated after the first failure of each ignition cycle.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the Malfunction Indicator Lamp (MIL) after the third consecutive trip the diagnostic has run and passed.
^ The history DTC will clear if the fault conditions have not been detected for 40 warm-up cycles.
^ A scan tool can be used to clear DTC information.

TEST DESCRIPTION

Steps 1-13:

Steps 14-25:

Steps 26-38:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that the condition is not intermittent.
4. This step determines which set of fuel injectors the circuit condition is affecting. If DTC P1261 is set, then a condition exists on cylinders 1, 4, 6, or 7. If DTC P1262 is set, then a condition exists on cylinders 2, 3, 5, or 8.
5. This step tests if a ground is constantly being applied to the fuel injectors.
6. This step isolates which circuit is causing the condition. If the test lamp turns OFF when a multi-way connector is disconnected, test the affected circuits for a short to ground.
7. This step tests for an open circuit. If the DMM displays OL on all of the fuel injector circuits, the ignition voltage circuit is open.
8. This step tests for an open circuit. If the DMM displays OL on one of the fuel injector circuits, the fuel injector command circuit is open.
9. This step tests for excessive resistance in a fuel injector circuit.
10. This step is testing for a short between the ignition feed circuit, and the fuel injector command circuit. If the resistance of the circuits is less than 0.3 Ohm, test for a short between the circuits. If a short cannot be found, the fuel injector may be the cause of the condition. The normal fuel injector resistance is between 0.3 Ohm-0.4 Ohm.
11. This step tests for a short to voltage on a fuel injector circuit. If the test lamp illuminates, a short to voltage is the cause of the condition.
12. This step isolates which circuit is causing the condition. If the test lamp turns OFF when a multi-way connector is disconnected, test the affected circuits for a short to voltage.
13. This step tests if a ground is constantly being applied to the fuel injectors.
14. This step isolates which circuit is causing the condition. If the test lamp turns OFF when a multi-way connector is disconnected, test the affected circuits for a short to ground.
15. This step tests for an open circuit. If the DMM displays OL on all of the fuel injector circuits, the ignition voltage circuit is open.
16. This step tests for an open circuit. If the DMM displays OL on one of the fuel injector circuits, the fuel injector command circuit is open.
17. This step tests for excessive resistance in a fuel injector circuit.
18. This step is testing for a short between the ignition feed circuit, and the fuel injector command circuit. If the resistance of the circuits is less than 0.3 Ohm, test for a short between the circuits. If a short cannot be found, the fuel injector may be the cause of the condition. The normal fuel injector resistance is between 0.3 Ohm-0.4 Ohm.
19. This step tests for a short to voltage on a fuel injector circuit. If the test lamp illuminates, a short to voltage is the cause of the condition.
20. This step isolates which circuit is causing the condition. If the test lamp turns OFF when a multi-way connector is disconnected, test the affected circuits for a short to voltage.