injector codes
#2
11-29-2009, 11:43 PM
P0204
CIRCUIT DESCRIPTION
The fuel injection control module (FICM) supplies high voltage to each fuel injector on the ignition voltage circuits. The FICM energizes each fuel injector by grounding the command circuit between the FICM and the fuel injector. The FICM monitors the status of the ignition voltage circuits and the fuel injector command circuits. When a fuel injector circuit condition is detected by the FICM, 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
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 ohms , 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 0.3-0.4 ohms .
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 0.3-0.4 ohms .
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.
The fuel injection control module (FICM) supplies high voltage to each fuel injector on the ignition voltage circuits. The FICM energizes each fuel injector by grounding the command circuit between the FICM and the fuel injector. The FICM monitors the status of the ignition voltage circuits and the fuel injector command circuits. When a fuel injector circuit condition is detected by the FICM, 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 charging system voltage is between 6-18 volts .
- The FICM detects an incorrect current on a fuel injector circuit.
- The condition exists for less than 1 second .
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
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 ohms , 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 0.3-0.4 ohms .
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 0.3-0.4 ohms .
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.
#3
11-29-2009, 11:45 PM
P1261
CIRCUIT DESCRIPTION
The fuel injection control module (FICM) supplies high voltage to each fuel injector on the ignition voltage circuits. The FICM energizes each fuel injector by grounding the command circuit between the FICM and the fuel injector. The FICM monitors the status of the ignition voltage circuits and the fuel injector command circuits. When a fuel injector circuit condition is detected by the FICM, 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
The ECM detects a circuit fault related to the high voltage circuit to cylinders 1, 4, 6, and 7.
ACTION TAKEN WHEN THE DTC SETS
The fuel injection control module (FICM) supplies high voltage to each fuel injector on the ignition voltage circuits. The FICM energizes each fuel injector by grounding the command circuit between the FICM and the fuel injector. The FICM monitors the status of the ignition voltage circuits and the fuel injector command circuits. When a fuel injector circuit condition is detected by the FICM, 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
- The ignition is ON.
- DTC U1800, or U2104 are not set.
The ECM detects a circuit fault related to the high voltage circuit to cylinders 1, 4, 6, and 7.
ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
