COMPONENT LOCATION |
GENERAL DESCRIPTION |
Based on information from various sensors, the ECM controls the amount of fuel sent to the cylinder via the fuel injection system. The fuel injector is a solenoid-operated valve that meters the fuel. The ECM controls by length of time the fuel injector is held open. The ECM grounds the injector control circuit to open the injector. When the ECM energizes the injector by grounding the control circuit, the circuit voltage should be pulled 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 before settling back to system voltage.
DTC DESCRIPTION |
Checking output signals from injectors every 10 sec. under detecting condition, if an output signal is high for more than 5 sec., ECM sets P0271.
DTC DETECTING CONDITION |
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Item | Detecting Condition | Possible Cause | ||||||||||
DTC Strategy |
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Enable Conditions |
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Threshold value |
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Diagnosis Time |
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MIL On Condition |
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SPECIFICATION |
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Item | Coil resistance(Ω) |
Injector | 13.8 ~ 15.2 [20°C(68°F)] |
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DIAGNOSTIC CIRCUIT DIAGRAM |
SIGNAL WAVEFORM & DATA |
Fig.1) Normal waveforms of Injector under idle condition.
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When the ECM energizes the injector by grounding control circuit, the circuit voltage should be low (theoretically 0V) and the fuel is injected. When the ECM de-energizes the injector by opening control circuit, the fuel injector is closed and circuit voltage should be peak at a moment.
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MONITOR GDS DATA |
1. | Connect GDS to Data Link Connector(DLC). |
2. | IG “ON”. |
3. | Select “DTC” button, and then Press “DTC Status” to check DTC’s information from the DTCs menu. |
4. | Read “DTC Status” parameter. |
5. | Is parameter displayed “Present fault”? Â
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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? Â
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CONTROL CIRCUIT INSPECTION |
â– Check voltage |
1. | IG “OFF” and disconnect injector connector. |
2. | IG “ON”. |
3. | Measure voltage between injector control terminal of injector harness connector and chassis ground.
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4. | Is the measured voltage within specification ? Â
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â– Check short to battery in harness |
1. | IG “OFF” and disconnect injector connector and ECM connector. |
2. | Measure resistance between power and control terminals of injector harness connector.
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3. | Is the measured resistance within specification ? Â
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COMPONENT INSPECTION |
â– Check injector |
1. | IG “OFF” and disconnect injector connector. |
2. | Measure resistance between power and control terminals of injector connector.(Component side)
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3. | Is the measured resistance within specification ? Â
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