PS469

GROUP
Engine
NUMBER
PS469
SUBJECT:
MODEL
All 2011MY or Newer,
Except Sorento (XM)
and Sedona (VQ)
DATE
January 2017
MANUAL EVAPORATIVE EMISSIONS TEST FOR
HARD TO FIND/SMALL LEAKS
If the malfunction indicator lamp (MIL) is illuminated with DTC(s) P0442, P0455, P0456, or
P0457 (Evaporative Emissions System-Leak detected) and the evaporative (EVAP) leak selftest resulted in NTF, a manual EVAP test is recommended.
Ensure that the fuel tank is at least half full before the test or it will not complete properly.
"T" Connectors can be used in series with the control side of the circuit of the Purge Control
Solenoid Valve (PCSV), Canister Close Valve (CCV) and Fuel Tank Pressure Sensor (FTPS).
Refer to KGIS for specific pinouts depending on the vehicle.
 NOTICE
This procedure is only valid on vehicles 2011MY or newer. This procedure will not
work on Sorento (XM) or Sedona (VQ) due to FTPS output voltage difference; always
refer to KGIS for proper voltage.
Step 1: Use a T-connector to monitor the Fuel Tank Pressure Sensor (FTPS) signal voltage.
Leave the volt meter connected in parallel throughout this procedure.
Step 2: With the Key On, Engine Off (KOEO), and gas cap OFF, measure the signal voltage at
the FTPS. Refer to KGIS for the FTPS Output Voltage specifications of the applicable vehicle. If
voltage is within the specified range, proceed to step 3. If the voltage is out of the specified
range, verify the 5V reference and ground at the FTPS with the KOEO, gas cap OFF. If the 5V
reference and ground are present, the FTPS is likely faulty. If the reference voltage and ground
are not present, check all related connections, wiring, and PCM. Follow normal diagnosis as
outlined in KGIS for any issues found.
Step 3: Install the gas cap and start the vehicle. Locate the Purge Control Solenoid Valve
(PCSV). Using a jumper wire, TAP the control wire to ground for 25 seconds while monitoring
the volt meter. The signal voltage at the FTPS should be greater than 1.5V. If the voltage is in
the specified range, proceed to step 4. If the voltage drops below 1.5v, there is a restriction in
the EVAP system (check: rollover valve, charcoal canister, CCV, air filter, evaporator lines).
Step 4: Remove the jumper wire to the PCSV and unplug the connector at the PCSV. Ground
the CCV control wire and monitor FTPS Voltage for 25 seconds. If the signal voltage at the
FTPS is steady, proceed to step 5. If voltage drops and continues to drop, the PCSV is likely to
be leaking.
Step 5: Plug the PCSV back in, and leave the jumper wire for CCV grounded. Use a second
(2nd) jumper wire and TAP the PCSV control wire to ground (to close the valve and draw partial
vacuum) until FTPS signal voltage drops to 1.0v - 1.4v. Unplug the PCSV connector and
monitor FTPS signal voltage for one (1) minute. The voltage should not change more then .300v
Page 1 of 2
in one (1) minute. If the voltage change is out of spec, there is a leak in the system. Check for
the leak using a smoke machine or the procedure outlined in step 6.
Step 6: Draw a partial vacuum on the system using the procedure outlined in step 5. Monitor the
FTPS signal voltage and begin isolating components by pinching off hoses. When the voltage
stabilizes, the leak is located on the branch of the EVAP system that was just isolated.
Diagnostic Flowchart:
Step 1:
Connect Voltmeter
Step 2:
Voltage:
v
Check FTPS
5v Reference & Ground
Yes
No
FTPS Faulty. Replace FTPS.
Voltage Out of Spec
Check Wiring
Voltage In Spec
Step 3:
Voltage:
v
Voltage Change Out of Spec
Restriction in Vent System
Voltage Change Out of Spec
PCSV Faulty. Replace PCSV
Voltage Out of Spec
Step 6:
Isolate components back to
fuel tank until steady
voltage, less than 2.4v.
Voltage In Spec
Step 4:
Voltage:
v
Voltage In Spec
Step 5:
Voltage:
v
Voltage In Spec
No Trouble Found
Page 2 of 2
Proceed with Normal
Diagnosis