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COMPONENT LOCATION

GENERAL DESCRIPTION

Based on information from various sensors, the ECM 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 ECM controls each injector by grounding the control circuit. When the ECM energizes the injector by grounding the control circuit, the circuit voltage should be low (theoretically 0V) and the fuel is injected. When the ECM 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 P0277. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC DETECTING CONDITION

Item	Detecting Condition	Possible Cause
DTC Strategy	● Signal High	● Poor connection ● Short to battery in harness ● Injector ● PCM
Enable condition	● Engine running state ● 11V ≤ Battery voltage ≤ 16V ● Above conditions are met 〉0.5sec.
Threshold value	● Short to battery
Diagnosis time	● Continuous
MIL ON condition	● 2 driving cycles

SIGNAL WAVEFROM AND DATA

When the PCM energizes the injector by grounding control circuit, the circuit voltage should be low (theoretically 0V) and the fuel is injected. When the PCM de-energizes the injector by opening control circuit, the fuel injector is closed and circuit voltage should be peak at a moment.

SPECIFICATION

Item			Coil resistance(Ω)
Injector			13.8 ~ 15.2Ω [20℃( 68℉)]

SCHEMATIC DIAGRAM

MONITOR DTC STATUS

Check DTC Status

(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"?

▶ Go to "Terminal and connector inspection" procedure.

▶ 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

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.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

▶ Go to "Control Circuit Inspection" procedure.

CONTROL CIRCUIT INSPECTION

Check voltage

(1)

IG "OFF" and disconnect injector connector.

(2)

IG "ON" and ENG "OFF"

(3)

Measure voltage between terminal 2 of injector harness connector and chassis ground.

Specification : Approx. 0V

(4)

Is the measured voltage within specification?

▶ Go to "Component Inspection" procedure.

▶ Go to "Check short to battery in harness" as follows.

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 : Infinite

(3)

Is the measured resistance within specification?

▶ Go to "Component Inspection" procedure.

▶ Repair short to battery in harness, and go to "Verification of Vehicle Repair" procedure.

COMPONENT INSPECTION

Check injector

(1)

IG "OFF" and disconnect injector connector.

(2)

Measure resistance between terminals 1 and 2 of injector connector.(Component side)

Specification :

Item			Coil resistance(Ω)
Injector			13.8 ~ 15.2Ω [20℃( 68℉)]

(3)

Is the measured resistance within specification?

▶ 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.

▶ 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.

Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode

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

Read "DTC Status" parameter

Is parameter displayed "History(Not Present) fault"?

▶ System performing to specification at this time. Clear the DTC.

▶ Go to the applicable troubleshooting procedure.