Honda CIVIC 10G 2016 Evap System Page 1

EVAP System Description
The evaporative emission (EVAP) controls minimize the amount of fuel vapor escaping into the atmosphere. Vapor from the fuel tank
is temporarily stored in the EVAP canister until it can be purged from the canister into the engine and burned.
The EVAP canister is purged by drawing fresh air through it and into a port on the intake manifold.
The purging vacuum is controlled by the EVAP canister purge valve.
A
lso attached to the EVAP canister are the EVAP canister vent shut valve and the fuel tank pressure (FTP) sensor
.
Operation
When fuel tank pressure increases because of heat and fuel vapor generation, evaporated fuel vapors are sent to the EVAP canister
where they are stored
.
When the engine coolant is hot enough, the PCM opens the EVAP canister purge valve to draw the stored fuel vapor in the EVAP
canister into the intake manifold to be burned. To regulate the amount of fuel vapor drawn into the engine, the PCM varies the EVAP
canister purge valve opening using duty cycle control.
When the outside air or other factor cools the fuel tank inside, the fuel tank pressure decreases.
The EVAP canister vent shut valve is normally open and allows outside air to enter the fuel tank through the EVAP canister.
If there is a system malfunction or blockage in the vent hose, a pressure valve on the fuel fill port opens and allows outside air to enter
preventing system damage.
The PCM uses the FTP sensor and EVAP canister vent shut valve to check for leaks in the system. When the enabling conditions are
met, the EVAP canister vent shut valve is closed, the PCM monitors for changes in the FTP sensor.
Joint of Intake Air Line (Turbo Model)
The purge air from the EVAP canister is drawn into the intake air at the merge point where more strong suction force.
Therefore, the merge point is variable by the engine condition with the turbocharger boost pressure.
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Contents Summary of Evap System

  • Page 1EVAP System Description The evaporative emission (EVAP) controls minimize the amount of fuel vapor escaping into the atmosphere. Vapor from the fuel tank is temporarily stored in the EVAP canister until it can be purged from the canister into the engine and burned. The EVAP canister is purged by dra
  • Page 2cardiagn.com Engine Condition Turbocharger Boost Non-return Valve A Non-return Valve B Merge Point Pressure Low Load Zero Open Close Point 2 Mid Load Rising-up from Zero Open Open Point 1* and Point 2 High Load High Close Open Point 1* *: A purge air flow velocity is accelerated by the compressed ai
  • Page 3EVAP Canister Purge Nozzle Removal and Installation Flammable - Keep Fire Away NOTE: Where icon is shown, click for further information. Refer to the Fuel and Emissions Systems Service Precautions before disconnecting the fuel line. Fuel may cause flammable gas leaks and may result in fire. Keep spa
  • Page 42 KX models cardiagn.com Detailed information, notes and precautions Torque: N·m (kgf·m, lbf·ft) Replace 1. EVAP Canister Purge Nozzle - Remove Note for installation Make sure the hose clamps are properly positioned and tightened, and make sure that they do not interfere with the surrounding parts.
  • Page 5EVAP Canister Purge Nozzle Removal and Installation Flammable - Keep Fire Away NOTE: Refer to the Fuel and Emissions Systems Service Precautions before disconnecting the fuel line. 1. EVAP Canister Purge Nozzle - Remove KA/KC/KL models 1. KA/KC/KL models: Disconnect purge tube B and purge tube D. 2.
  • Page 6KX models 2. All Removed Parts - Install cardiagn.com 1. Install the parts in the reverse order of removal with a new O-ring.
  • Page 7EVAP Canister Purge Valve Removal and Installation Flammable - Keep Fire Away NOTE: Where icon is shown, click for further information. Refer to the Fuel and Emissions Systems Service Precautions before disconnecting the fuel line. 1 cardiagn.com Torque: N·m (kgf·m, lbf·ft)
  • Page 82 cardiagn.com
  • Page 9cardiagn.com Detailed information, notes and precautions Torque: N·m (kgf·m, lbf·ft) 1. Engine Cover - Remove 2. Vacuum Hose and Vacuum Pipe - Move 3. Cooling Pipe Bracket - Move 4. Intercooler Pipe Bracket - Remove 5. EVAP Canister Purge Valve - Remove
  • Page 10cardiagn.co
  • Page 11Note for installation Make sure the hose clamps are properly positioned and tightened, and make sure that they do not interfere with the surrounding parts. 6. Purge Joint - Remove Note for installation Make sure the hose clamps are properly positioned and tightened, and make sure that they do not in
  • Page 12EVAP Canister Purge Valve Removal and Installation Flammable - Keep Fire Away NOTE: Refer to the Fuel and Emissions Systems Service Precautions before disconnecting the fuel line. 1 cardiagn.com Torque: N·m (kgf·m, lbf·ft) 1. Intake Air Duct - Remove 2. PCS Guard - Remove
  • Page 133. Hoses and Connector (EVAP Canister Purge Valve) - Disconnect cardiagn.com
  • Page 144. EVAP Canister Purge Valve - Remove 5. All Removed Parts - Install 1. Install the parts in the reverse order of removal. NOTE: Make sure the hose clamps are properly positioned and tightened. cardiagn.com
  • Page 15EVAP Canister Purge Valve Removal, Installation, and Inspection Flammable - Keep Fire Away NOTE: Refer to the Fuel and Emissions Systems Service Precautions before disconnecting the fuel line. 1 cardiagn.com Torque: N·m (kgf·m, lbf·ft) 1. Hose - Disconnect 2. EVAP Canister Purge Valve - Remove 3. Al
  • Page 16NOTE: Make sure the hose clamps are properly positioned and tightened. Flammable - Keep Fire Away NOTE: Refer to the Fuel and Emissions Systems Service Precautions before disconnecting the fuel line. Non-Return Valve Inspection (KA/KC/KL models) 1. EVAP Canister Purge Valve Hose - Disconnect 1. Disc
  • Page 17Non-Return Valve A (Intake Manifold Side) 1. Select the PGM-FI system with the HDS. 2. Select the INSPECTION MENU, then select EVAP TEST, and follow the screen prompts. 3. Select the SINGLE SOLENOID, then select PCS (CPV) ON, and follow the screen prompts. 4. Connect the vacuum pump (A) to the EVAP
  • Page 18Non-Return Valve B (Turbocharger Side) Non-Return Valve Inspection (KX models) cardiagn.com 1. EVAP Canister Purge Valve Hose - Disconnect 1. Disconnect the EVAP canister purge valve hoses (A). 2. Non-return Valve - Inspection 1. Connect EVAP canister purge valve 2P connector terminals to the 12 vol
  • Page 19Non-Return Valve A (Intake Manifold Side) 2. Connect the vacuum pump (A) to the EVAP canister purge valve (B) as shown. 3. Apply vacuum to the valve. If it holds vacuum, replace the EVAP canister purge valve. If it doesn't hold the vacuum, go to next step. cardiagn.com Non-Return Valve B (Turbocharg
  • Page 20Non-Return Valve A (Intake Manifold Side) 4. Connect the vacuum pump (A) to the EVAP canister purge valve (B) as shown. 5. Apply pressure to the valve. If it holds pressure, the EVAP canister purge valve is OK. If it doesn't hold the pressure, replace the EVAP canister purge valve. Non-Return Valve
  • Page 21EVAP Canister Removal and Installation Flammable - Keep Fire Away NOTE: Refer to the Fuel and Emissions Systems Service Precautions before disconnecting the fuel line. 1 KA/KC models cardiagn.com Torque: N·m (kgf·m, lbf·ft)
  • Page 22cardiagn.co
  • Page 232 KL models cardiagn.com Torque: N·m (kgf·m, lbf·ft) 1. Front Floor Undercover - Remove 2. Fuel Vent Tube, Hose, and Connector (EVAP Canister Vent Shut Valve and FTP Sensor) - Disconnect 3. Quick-Connect Fitting - Disconnect (KL models)
  • Page 244. EVAP Canister Assembly - Remove cardiagn.com
  • Page 255. EVAP Canister Vent Shut Valve - Remove 6. FTP Sensor - Remove 7. All Removed Parts - Install 1. Install the parts in the reverse order of removal with a new retainer and new O-rings. NOTE: Make sure the hose clamps are properly positioned and tightened. cardiagn.com
  • Page 26EVAP Canister Vent Shut Valve Removal and Installation Flammable - Keep Fire Away NOTE: Refer to the Fuel and Emissions Systems Service Precautions before disconnecting the fuel line. 1. Front Floor Undercover - Remove 2. EVAP Canister Vent Shut Valve - Remove 1. Disconnect the connector (A). cardia
  • Page 27How to Troubleshoot the Fuel and Emissions Systems Intermittent Failures The term intermittent failure means a system may have had a failure, but it checks OK now. If the malfunction indicator lamp (MIL) on the dash does not come on, check for poor connections or loose terminals at all connectors re
  • Page 285. Check the diagnostic trouble code (DTC) and note it. Also check the on-board snapshot data, and download any data found. Then refer to the indicated DTC's troubleshooting, and begin the appropriate troubleshooting procedure. NOTE: On-board snapshot indicates the engine conditions when the first m
  • Page 292. Do the PCM idle learn procedure. 3. Turn the vehicle to the OFF (LOCK) mode. 4. Disconnect the HDS from the DLC. NOTE: The PCM is part of the immobilizer system. If you replace the PCM, you must register the PCM to the keyless access system. How to Troubleshoot Circuits at the PCM Connectors NOTE
  • Page 305. Gently contact the pin probe (male) at the terminal test port from the terminal side. Do not force the tips into the terminals. cardiagn.com For accurate results, always use the pin probe (male). To prevent damage to the connector terminals, do not insert test equipment probes, paper clips, or ot
  • Page 31How to Troubleshoot the Fuel and Emissions Systems Intermittent Failures The term intermittent failure means a system may have had a failure, but it checks OK now. If the malfunction indicator lamp (MIL) on the dash does not come on, check for poor connections or loose terminals at all connectors re
  • Page 326. If no DTCs are found, go to the MIL circuit troubleshooting. If the MIL did not stay on If the MIL did not stay on but there is a driveability problem, do the symptom troubleshooting. If you cannot duplicate the DTC Some of the troubleshooting requires you to reset the PCM and try to duplicate th
  • Page 33NOTE: The PCM stays on for up to an hour after the vehicle is turned to the OFF (LOCK) mode. Jumping the SCS line after turning the vehicle to the OFF (LOCK) mode cancels this function. Disconnecting the PCM during this function, without jumping the SCS line first, can damage the PCM. 1. Jump the SC
  • Page 345. Connect one side of the patch cord terminals (A) to a commercially available digital multimeter (B), and connect the other side of the terminal (C) to the pin probe male. 6. Gently contact the pin probe (male) at the terminal test port from the terminal side. Do not force the tips into the termin