Test TC-187A - EVAP Leak Monitor Pinched Hose
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.
- To properly diagnose this trouble code, Miller Tool Kit (6872A) is necessary. Perform evaporative system pressure pump self-test specified on cover of tool kit.
- Connect EVAP pressure pump supply hose to EVAP system test port. See Fig 1. Start engine. Using scan tool in LDP SYSTEM TEST, follow instructions displayed on screen. Set pressure hold to OPEN position and set vent to CLOSED position. Turn pump timer on. Go to next step.
- Allow pressure on Miller Tool Kit (6872) to build to at least 14 in. of water vacuum. Remove gas cap. If pressure dropped when gas cap was removed, go to next step. If pressure did not drop when gas cap was removed, go to step 5).
- Reinstall gas cap and allow pressure to build up to at least 14 in. of water vacuum. Disconnect LDP hose from LDP. If pressure dropped when hose was disconnected, replace LDP. Perform TEST VER-5A. If pressure did not drop when hose was disconnected, replace evaporative canister. Perform TEST VER-5A.
- Reinstall gas cap. Allow pressure to build to at least 14 in. of water vacuum. Remove fuel tank rollover hose from EVAP canister. If pressure did not drop when hose was disconnected, go to next step. If pressure dropped when hose was disconnected, repair pinched hose from fuel tank to EVAP canister. Perform TEST VER-5A.
- Disconnect EVAP purge line at EVAP canister. If pressure dropped when hose was disconnected, replace EVAP canister. Perform TEST VER-5A. If pressure did not drop when hose was disconnected, repair obstruction in EVAP purge line to EVAP canister. Perform TEST VER-5A.