How to repair engine Hesitate & black smoke on Acceleration

How to repair engine hesitate & black smoke on acceleration

Study Model:

• Hyundai Accent

Study Year Model:

• 2004

Fuel:

• Gasoline

Study Displacement:

• 1300cc

 

1)Study Condition:

1. Engine hesitate and black smoke on acceleration.

2)Study Cause

• EVAP.Emission Control System-PCSV Circuit Short.

3)Study Diagnosis

1. Check Scan tool.

• P0445 EVAP.Emission Control System-PCSV Circuit

Component Location

Study General Description

Study The evaporative emission control system prevents hydrocarbon (HC) vapors from the fuel tank from escaping into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. Study The ECM controls the Purge Control Solenoid Valve (PCSV) to purge any collected vapors from the canister back to the engine for combustion. Study This valve is actuated by the purge control signal from the ECM and controls fuel vapor from the canister to the intake manifold.

Study DTC Description

Study ECM sets DTC P0445 if the ECM detects that the PCSV control line is short to ground or short to battery line.

DTC Detecting Condition

Item
Detecting Condition
Possible cause

Monitoring Strategy
● Circuit continuity check, high
● Short to battery in control circuit
● Faulty PCSV
● Faulty ECM

Threshold value
● Study Short circuit to battery

Enable Conditions

Diagnostic Time
● Continous

Fail Safe
● None 

Specification

Purge Control Solenoid Valve
Normal Parameter At 20°C(68°F)

Resistance
26 Ω

Signal Waveform

Study This is waveform measured at terminal 2 of PCSV under no-load,1500 RPM.

1. StudyThe voltage at point  is 14 V.

A.Possible cause:No power supply or open in PCSV.

2.Study Point  is a surge voltage when power TR is off and about 45 V.

3.Study Periode  is the duration when PCSV operates and usually operating duty value is about 15 % in 2000RPM.

4.Periode  is duty per 1Hz and ON-OFF ratio of TR in ECM.

4) Study Repair Guide

• Replace PCSV(Purge Control Solenoid Valve)

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