P0264
DTC P0264 Cylinder 1-injector Circuit Low
COMPONENT LOCATION
GENERAL DESCRIPTION
Based on information from various sensors, the PCM measures the fuel injection amount. The fuel injector is a solenoid operated valve and the fuel injection amount is controlled by length of time the fuel injector is held open. The PCM controls each injector by grounding the control circuit. When the PCM energizes the injector by grounding the control circuit, the circuit voltage should be low (theoretically 0 V) and the fuel is injected. When the PCM de-energizes the injector by opening the control circuit, the fuel injector is closed and circuit voltage should momentarily peak.
DTC DESCRIPTION
[P0261] PCM sets DTC P0261 if the PCM detects that injector (Cylinder #1) control circuit is shorted to ground.
[P0264] PCM sets DTC P0264 if the PCM detects that injector (Cylinder #2) control circuit is shorted to ground.
[P0267] PCM sets DTC P0267 if the PCM detects that injector (Cylinder #3) control circuit is shorted to ground.
[P0270] PCM sets DTC P0270 if the PCM detects that injector (Cylinder #4) control circuit is shorted to ground.
DTC Detecting Condition:
Schematic Diagram:
MONITOR OTC STATUS
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Press F4(DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.
5. Is parameter displayed "History (Not Present) fault"?
NOTE:
1. History (Not Present) fault: DTC occurred but has been cleared.
2. Present fault: DTC is occurring at present time.
YES: Fault is intermittent, caused by poor contact in the sensor's and/or PCM'S connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to "Component Inspection" procedure.
COMPONENT INSPECTION
1. Ignition "OFF".
2. Disconnect injector connector.
3. Measure resistance between terminals 1 and 2 of the injector connector (Component side).
NOTE:
P0261: Injector #1
P0264: Injector #2
P0267: Injector #3
P0270: Injector #4
4. Is resistance within the specification?
YES: Go to next step as below.
NO: Check injector for contamination, deterioration, or damage. Substitute with a known-good injector and check for proper operation. If the problem is corrected, replace injector and then go to "Verification of Vehicle Repair" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage
3. Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure procedure.
NO: Go to "Power Supply Circuit Inspection" procedure.
POWER SUPPLY CIRCUIT INSPECTION
1. Ignition "ON" Engine "OFF".
2. Measure voltage between terminal 1 of the injector harness connector and chassis ground
NOTE:
P0261; Injector #1
P0264 Injector #2
P0267: Injector #3
P0270: Injector #4
Specification: Approx. B+
3. Is voltage within the specification?
YES: Go to "Control Circuit Inspection" procedure.
NO:
- Check for a open in the power supply circuit between the main relay and the Injector
- Check for open or blown 15 A injector fuse.
- Repair as necessary and go to "Verification of Vehicle Repair" procedure.
CONTROL CIRCUIT INSPECTION
1. Check for short to ground in control circuit.
1. Ignition "OFF".
2. Measure resistance between terminal 2 of the injector harness connector and chassis ground.
Specification: Infinite
2. Is resistance within the specification?
YES: Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Repair open or short to ground in control harness and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History (Not Present) fault
YES: System performing to specification at this time. Clear the DTC.
NO: Go to the applicable troubleshooting procedure.