Test TC-160A - EVAP Leak Monitor Small Leak Detected
NOTE:
For connector terminal ID, see CONNECTOR IDENTIFICATION Directory. For wiring diagram, see WIRING DIAGRAMS - 2.0L
article.
CAUTION:
When performing test procedures keep all ignition sources away from test area. Ensure test area is well ventilated. Ensure fuel tank is at least 1/2 full before performing test. Pressurizing fuel tank with less than 3 gallons of fuel may result in an explosion caused by ignition of the fumes. Wear safety glasses when performing test procedures. If vehicle is not being tested on a hoist, ensure parking brake is applied and drive wheels are blocked before performing test procedures.
- A defective secondary seal in fuel filler neck or leaving fuel cap loose or off could set this trouble code. Connect a hand vacuum pump to Leak Detection Pump (LDP) Service Vacuum Supply Tee (SVST). SVST is located in-line in direct vacuum supply hose to LDP. See Fig 1. Using hand vacuum pump, apply 18 in. of vacuum to LDP. If hand vacuum pump holds vacuum, go to next step. If hand vacuum pump does not hold vacuum, inspect vacuum hoses for damage. Repair vacuum hoses as necessary. Perform TEST VER-5A. If vacuum hoses are okay, replace LDP. Perform TEST TC-160A to verify repair.
- Turn ignition on. Using scan tool, actuate LDP. Observe vacuum gauge on hand held vacuum pump. If vacuum drops, go to next step. If vacuum does not drop, replace LDP. Perform TEST TC-160A to verify repair.
- To continue and properly diagnose this trouble code, Miller Tool Kit (6872A) is necessary. Perform evaporative system pressure pump self-test specified on cover of tool kit. Go to next step.
- Connect EVAP pressure pump supply hose to EVAP system test port. See Fig 1. Start engine. Using scan tool in LDP SYSTEM TEST, press key No. 3 to hold. Disconnect purge solenoid. Set pressure hold to OPEN position and set vent to CLOSED position. Turn pump timer on. Go to next step.
- Perform IM240 simulation described on cover of Tool Kit (6872A) while scan tool is still in LDP SYSTEM TEST. If pressure drops more than 8 in. of water vacuum in 2 minutes, go to step 7). If pressure does not drop more than 8 in. of water vacuum in 2 minutes, go to next step.
- Inspect all related wiring, connectors and hoses and repair as necessary. Perform TEST VER-5A. If no problems were found with wiring, connectors and hoses, see INACTIVE TROUBLE CODE CONDITION in SELF-DIAGNOSTICS INTRODUCTION - CARS EXCEPT TALON TURBO article. Test is complete. Perform TEST VER-5A.
- To continue test, Ultrasonic Leak Detector (6904) is necessary. While scan tool is still in LDP SYSTEM TEST, set pressure hold to OPEN and set vent to OPEN position. Turn pump timer on. Move Miller Tool Kit (6872A) away from vehicle to prevent operating noise from interfering with testing procedure.
- Using ultrasonic leak detector, start listening for leaks at fuel cap, fuel tank rollover valve, EVAP canister, LDP and EVAP solenoid. If any leaks are heard with ultrasonic leak detector, repair or replace leaking component. Perform TEST VER-5A. If no leaks are heard with ultrasonic leak detector, replace LDP. Perform TEST VER-5A.