Refer to Engine Controls Schematics
Fuel Injectors
Circuit Description
The PCM controls the fuel injectors by using an ignition feed driver and a ground circuit within the PCM. The driver has the ability to detect an electrical malfunction in the ignition feed or in the ground circuit. If an electrical malfunction occurs in the fuel injector circuit for engine cylinder 1, DTC P0201 will set.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
| • | The PCM detects an electrical malfunction on the injector circuit for engine cylinder 1. |
| • | The condition is present for at least 30 seconds. |
Action Taken When the DTC Sets
| • | The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed. |
| • | The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has run and passed. |
| • | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using a scan tool. |
Diagnostic Aids
The misfire history counter may help to determine which injector circuit is malfunctioning. If DTC P0300 was set, look at the Misfire History display for each cylinder. The largest value that is stored in the misfire history counters will indicate the location of the malfunctioning injector circuit or injector.
Inspect for the following conditions:
Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
| • | Loose terminal connection |
| - | Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| - | Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| • | Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
| • | Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
If the condition is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests for malfunctioning fuel injector control circuit or ignition feed wiring.
-
This step tests for a malfunction in the fuel injector ignition feed circuit.
-
This step tests for a short to ground in the injector control circuit.
-
This step tests for an open in the fuel injector control circuit.
-
When you replace the PCM, you must program the new PCM.
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | ||||||
2 | With the engine idling, monitor Specific DTC info for DTC P0201 with a scan tool. Does the DTC reset? | -- | ||||||
3 |
Does the DTC reset? | -- | Go to Diagnostic Aids | |||||
Is the voltage near the specified value? | B+ | |||||||
5 | Test the fuel injectors. Refer to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F) or Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Outside 10-35 Degrees C (50-95 Degrees F) . Did all injectors pass? | -- | ||||||
6 |
Is the voltage near the specified value? | 0V | ||||||
7 |
Did you find and correct the condition? | -- | ||||||
8 |
Did you find and correct the condition? | -- | ||||||
Is the voltage near the specified value? | B+ | |||||||
Probe the cylinder 1 fuel injector control circuit at the cylinder 1 fuel injector harness connector with a test lamp to B+. Does the test lamp illuminate? | -- | |||||||
Does the test lamp illuminate? | -- | |||||||
12 |
Did you find and correct the condition? | -- | ||||||
13 | Locate and repair the open in the cylinder 1 fuel injector control circuit. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | -- | |||||
14 | Locate and repair the open or the short to ground in the cylinder 1 fuel injector ignition feed circuit. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | -- | |||||
15 | Locate and repair the short to ground in the cylinder 1 fuel injector control circuit. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | -- | |||||
16 | Locate and repair the short to voltage in the cylinder 1 fuel injector control circuit. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | -- | |||||
17 | Replace the malfunctioning fuel injectors. Refer to Fuel Injection Fuel Rail Assembly Replacement . Did you complete the replacement? | -- | -- | |||||
|
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Did you complete the replacement? | -- | -- | ||||||
19 |
Does the DTC reset? | -- | System OK |
