P0271
DTC P0262 CYLINDER 1-INJECTOR CIRCUIT HIGHDTC P0265 CYLINDER 2-INJECTOR CIRCUIT HIGH
DTC P0268 CYLINDER 3-INJECTOR CIRCUIT HIGH
DTC P0271 CYLINDER 4-INJECTOR CIRCUIT HIGH
DTC P0274 CYLINDER 5-INJECTOR CIRCUIT HIGH
DTC P0277 CYLINDER 6-INJECTOR CIRCUIT HIGH
Component Location:
GENERAL DESCRIPTION
Based on information from various sensors, the PCM measures the fuel injection amount. 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
Checking output signals from injectors under detecting condition, if an output signal is high, PCM sets P02621P0265/P0268/P0271/P0274/P0277. MIL (Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle
DTC Detecting Condition:
Specification:
Schematic Diagram:
Signal Waveform And Data:
MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector (DLC).
2. IG "ON".
3. Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC's information from the DTCs menu
4. Read "DTC Status" parameter.
5. Is parameter displayed "Present fault"?
YES : Go to "Terminal and Connector inspection" procedure.
NO : 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, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness 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
NO : Go to "Control Circuit Inspection" procedure.
CONTROL CIRCUIT INSPECTION
1. Check voltage
1. IG "OFF" and disconnect injector connector.
2. IG "ON" and ENG "OFF"
3. Measure voltage between terminal 1 of injector harness connector and chassis ground.
Specification : Approx. 0 V
4. Is the measured voltage within specification?
YES : Go to "Component Inspection" procedure.
NO : Go to "Check short to battery in harness" as follows.
2. Check short to battery in harness
1. IG "OFF" and disconnect injector connector and PCM connector.
2. Measure resistance between terminals 1 and 2 of injector harness connector.
Specification : Below 1 Ohm
3. Is the measured resistance within specification?
YES : Go to "Component Inspection" procedure.
NO : Repair short to battery in harness, and go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. Check injector
1. IG "OFF" and disconnect injector connector.
2. Measure resistance between terminals 1 and 2 of injector connector (Component side)
Specification:
3. Is the measured resistance within specification?
YES : Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
NO : Substitute with a known - good injector and check for proper operation. If the problem is corrected, replace injector and go to "Verification of Vehicle Repair" procedure.
NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. After testing PCM on the vehicle, use this function to reuse the PCM on the others
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.