Severity of Code P2147
This fault is considered severe. A lack of fuel in the mixture (called a “lean mixture”) at idle can eventually cause significant engine damage. Immediate corrective maintenance is imperative to preserve engine longevity.
Common Symptoms
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Unstable idle
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Poor engine performance
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Hesitation or misfires
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Excessive smoke (exhaust)
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Abnormal engine noises
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Noticeable power loss
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Increased fuel consumption
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Difficulty on inclines
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Delayed throttle response
Probable Causes
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Faulty injector(s)
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Damaged wiring harness
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Short circuit or break in the wiring
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Internal failure of the Engine Control Module (ECM)
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Oxidized or faulty connector
Diagnostic Procedure
Step 1: Visual Inspection
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Identify the relevant injector group according to manufacturer data.
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Physically access the injectors (disassembly if necessary).
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Check the condition of the wires: look for exposed, burnt, or damaged insulation. Repair with heat shrink tubing if needed.
Step 2: Connector Check
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Examine the injector valleys where moisture can accumulate.
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Clean corroded connectors with contact spray.
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Check the seal and fit of the tabs.
Step 3: Electrical Tests
a) Continuity Check
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Set the multimeter to Ohmmeter (Ω).
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Disconnect ECM and injectors.
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Measure the resistance between the ends of the circuit.
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Any value > 0.5 Ω indicates a fault (broken or oxidized wire).
b) Circuit Verification
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Follow the specific vehicle manufacturer procedure.
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Test the injector power supply and ground.
Improvements Made:
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Clear Structure: Hierarchical titles and bulleted lists.
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Precise Technical Terminology: Replacement of informal terms (“lean” → “lean mixture”, “ECM” → “Engine Control Module”).
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Operational Instructions: Detailed and sequenced test procedures.
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Conciseness: Removal of redundancies and unnecessary phrasing.
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Enhanced Warning: Emphasis on the urgency of intervention.