Evaporative Emission Control System Diagnosis FWD

Tools Required

1. Remove the EVAP canister. Refer to Evaporative Emission Canister Replacement.
2. Visually inspect the EVAP canister, especially at the arrows, for any cracks or damage.




Caution: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.

3. Use the J 41413-300 EVAP cap and plug kit or an equivalent in order to block the purge port (2) closed.
4. Blow air with a pressure of 1.7 kPa (0.5 in Hg/0.25 psi) into the ORVR vent port (1).
5. Verify that air flows out of inlet air port (3).



6. Block the ORVR vent port (3) closed.
7. Connect the J 23738-A hand vacuum pump or an equivalent to the purge port (1).
8. Apply a vacuum of 0.85 kPa (0.25 in Hg/0.18 psi) into the purge port (1).
9. Verify that air is drawn into the air inlet port (2).



10. Block the air inlet port (4) closed.
11. Block the purge port (3) closed.
12. Remove the small vacuum hose between the FLVV port (1) and the EVAP vacuum leak pump port (2).
13. Block the vacuum leak pump port (2) closed.
14. Apply a pressure of 19.6 kPa (5.8 in Hg/2.81 psi) to the ORVR vent port (5).
15. Verify that the pressure holds and does not leak out the small vacuum port (1).
16. Replace the EVAP canister and EVAP vacuum leak pump if any of the inspections or tests are failed. Refer to Evaporative Emission Canister Replacement.

Caution: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.




1. Remove the EVAP canister vacuum leak pump. Refer to Evaporative Emission System Vacuum Leak Pump Replacement.
2. Use a DMM in order to measure the resistance of the EVAP vent solenoid that is located in the EVAP vacuum leak pump assembly. Refer to the vacuum pump terminal identification table above.
3. Connect the DMM to the ignition voltage terminal and the solenoid control terminal.

Measure
The EVAP canister vent valve resistance should be 25-30 ohms at 20°C (68°F).

4. Replace the EVAP vacuum leak pump assembly if the resistance is not within the specified range. The solenoid will damage the powertrain control module (PCM) if the resistance value is less than 25 ohms.
5. Check the PCM and replace if necessary. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.



6. Blow air into the air inlet port. The air should flow through the assembly and out of both ports.



7. Apply battery voltage to the ignition voltage terminal and ground to the solenoid control terminal. Refer to the vacuum pump terminal identification table above.
8. Blow air into the air inlet port. The air should flow only through small port and NOT the large canister port.
9. Replace the EVAP vacuum leak pump assembly if the pump failed either test. Refer to Evaporative Emission System Vacuum Leak Pump Replacement.

Caution: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.

1. Remove the EVAP canister purge valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement.
2. Use a DMM in order to measure the resistance of the EVAP canister purge valve.

Measure
The EVAP canister purge valve resistance should be 26-30 ohms at 20°C (68°F).

3. Replace the EVAP canister purge valve if the resistance is not within the specified range. The solenoid will damage the powertrain control module (PCM) if the resistance value is less than 26 ohms.
4. Check the PCM and replace if necessary. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.



5. Blow air into one of the ports. The air should NOT flow through the opposite port.
6. Apply battery voltage across the terminals of the EVAP canister purge valve.
7. Blow air into the one port. The air should flow easily to the opposite port.
8. Replace the EVAP canister purge valve if the valve failed either test. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement.

Evaporative Emission Control System Diagnosis AWD

Tools Required

1. Remove the EVAP canister. Refer to Evaporative Emission Canister Replacement .
2. Visually inspect the EVAP canister, especially at the arrows, for any cracks or damage.

Caution: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.




3. Use the J 41413-300 EVAP cap and plug kit or an equivalent in order to block the ORVR vent line port (4). The vent port will remain plugged for all the tests.
4. Block the purge port (3) closed.
5. Blow air with a pressure of 1.7 kPa (0.5 in Hg/0.25 psi) into the EVAP vapor port (2).
6. Verify that air flows out of drain hose (1).



7. Block the purge port (2) and the drain hose (1) closed.
8. Blow air with a pressure of 1.7 kPa (0.5 in Hg/0.25 psi) into the EVAP vapor port (3).
9. Verify that air does not flow out of the air inlet port (4).



10. Block the air inlet port (1) closed.
11. Connect the J 23738-A or an equivalent hand vacuum pump to the purge port (2).
12. Apply a vacuum of 3.5 kPa (1.0 in Hg/0.5 psi) to purge port (2) with the hand vacuum pump.
13. Verify that the vacuum holds while the air inlet port (1) is closed.
14. Open the air inlet port (2) and verify that the vacuum is released.



15. Block the air inlet port (1) closed.
16. Connect the J 23738-A or an equivalent hand vacuum pump to the EVAP vapor port (3).
17. Apply a vacuum of 3.5 kPa (1.0 in Hg/0.5 psi) to the EVAP vapor port (3) with the hand vacuum pump.
18. Verify that there is vacuum pressure at the purge port (2).
19. Replace the EVAP canister if the canister failed any of the inspections or tests. Refer to Evaporative Emission Canister Replacement .

Caution: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.




1. Remove the EVAP canister purge valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
2. Use a DMM in order to measure the resistance of the EVAP canister purge valve.

Measure
The EVAP canister purge valve resistance should be 27-33 ohms at 20°C (68°F).

3. Replace the EVAP canister purge valve if the resistance is not within the specified range. The solenoid can damage the powertrain control module (PCM) if the resistance value is less than 27 ohms.
4. Check the PCM and replace if necessary. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.



5. Check for continuity of each terminal to the valve body. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
6. Replace the EVAP canister purge valve if continuity is present.



7. Blow air into one of the ports. The air should NOT flow through the opposite port.
8. Apply battery voltage across the terminals of the EVAP canister purge valve.
9. Blow air into the one port. The air should flow easily to the opposite port.
10. Replace the EVAP canister purge valve if the valve failed either test. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .

Caution: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.




1. Remove the EVAP pressure switching solenoid. Refer to Evaporative Emission Pressure Switching Solenoid Replacement .
2. Use a DMM in order to measure the resistance of the EVAP pressure switching solenoid.

Measure
The EVAP pressure switching solenoid resistance is 37-44 ohms at 20°C (68°F).

3. Replace the EVAP pressure switching solenoid if the resistance is not within the specified range. The solenoid can damage the PCM, if the resistance value is less than 27 ohms.
4. Check the PCM and replace if necessary. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.



5. Check for continuity on each terminal to the valve body.
6. Replace the EVAP pressure switching solenoid if continuity is present. Refer to Evaporative Emission Pressure Switching Solenoid Replacement .



7. Blow air into the inboard port (1). The air should NOT flow through the valve and out of the outboard port (2).
8. Apply battery voltage across the terminals of the EVAP pressure switching solenoid.
9. Blow air into the inboard port (1) and air should flow through the valve and out of the outboard port (2).
10. Replace the EVAP pressure switching solenoid if the solenoid failed either test. Refer to Evaporative Emission Pressure Switching Solenoid Replacement .

Caution: Do not breathe the air through the EVAP component tubes or hoses. The fuel vapors inside the EVAP components may cause personal injury.




1. Remove the EVAP canister vent solenoid. Refer to Evaporative Emission Canister Vent Solenoid Valve Replacement .
2. Use a DMM in order the measure the solenoid resistance value.

Measure
The resistance should be between 25-30 ohms at 20°C (68°F).

3. Replace the solenoid if the resistance is not within the specified range. Refer to Evaporative Emission Canister Vent Solenoid Valve Replacement .



4. Use a DMM in order the check for continuity between each solenoid terminal and solenoid housing.

Measure
The DMM has to read infinite (OL).

5. Replace the EVAP vent solenoid valve if the resistance is not within specification. A shorted valve can cause damage to the PCM.



6. Blow air through the upper port of the EVAP vent valve. Air has to flow freely through the lower port.
7. Replace the solenoid if the air does not flow through the upper port. Refer to Evaporative Emission Canister Vent Solenoid Valve Replacement .



8. Apply battery voltage across the solenoid terminals.
9. Blow air through the upper port of the solenoid. Air should NOT flow through the valve.
10. Replace the solenoid if the solenoid fails any of the tests. Refer to Evaporative Emission Canister Vent Solenoid Valve Replacement .