Refer to
Fuel Injectors
Circuit Description
The powertrain control module (PCM) controls each fuel injector separately through a ground driver circuit located within the PCM. The PCM monitors the driver circuit and has the ability to detect an electrical malfunction. If the PCM detects an electrical malfunction in the fuel injector circuit for cylinder #1, DTC P0201 is 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 illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has run and failed. |
| • | If the electrical malfunction could lead to possible catalyst damage, the PCM immediately flashes the MIL while the fault remains at catalyst damaging levels. |
| • | The PCM disables the TCC operation. |
| • | The PCM stores the conditions which were present when the DTC set as Freeze Frame and Fail Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM turns the MIL off during the third consecutive trip in which the diagnostic has run and passed. |
| • | The history DTC clears after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC may be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed. |
Diagnostic Aids
The misfire history counter may be useful in determining which injector circuit is malfunctioning. If DTC P0300 was set, look at the Misfire Hist # display for each cylinder. The largest value stored in the misfire history counters will indicate the location of the malfunctioning injector circuit or injector.
Inspect for the following conditions:
| • | A faulty connection at the PCM or the fuel injector. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. |
| • | Inspect the wiring harness for damage. |
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
Test Description
The number(s) below refer to the step number(s) on the Diagnostic Table.
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Tests for a malfunctioning fuel injector control circuit or ignition feed wiring.
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Tests for a malfunction in the fuel injector ignition feed circuit.
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Tests for a short to ground in the injector control circuit.
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Tests for an open in the fuel injector control circuit.
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This vehicle is equipped with a powertrain control module (PCM) which utilizes an electrically erasable programmable read-only memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||||||
2 | With the engine idling, use a scan tool in order to monitor Specific DTC info for DTC P0201. Does the scan tool indicate DTC P0201 Failed This Ign? | -- | ||||||
3 |
Does the scan tool indicate DTC P0201 Failed This Ign? | -- | 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) . Are the fuel injectors OK? | -- | ||||||
6 |
Does the voltage measure near the specified value? | 0 V | ||||||
7 |
Was a problem found? | -- | ||||||
8 |
Was a problem found? | -- | ||||||
Is the voltage near the specified value? | B+ | |||||||
Does the test lamp illuminate? | -- | |||||||
Does the test lamp illuminate? | -- | |||||||
12 |
Was a problem found? | -- | ||||||
13 | Locate and repair an open in the cylinder #1 fuel injector control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |||||
14 | Locate and repair an open or a short to ground in the cylinder #1 fuel injector ignition feed circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |||||
15 | Locate and repair a short to ground in the cylinder #1 fuel injector control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |||||
16 | Locate and repair a short to voltage in the cylinder #1 fuel injector control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |||||
17 | Replace the malfunctioning fuel injector(s). Refer to Fuel Injection Fuel Rail Assembly Replacement . Did you complete the repair? | -- | -- | |||||
|
Important:: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Did you complete the repair? | -- | -- | ||||||
19 |
Does the scan tool indicate DTC P0201 Failed This Ign? | -- | System OK |
