1, 2 and 3 Digit Codes: 187

Scan Tool 187 (MIL 31):

Trouble Code Number
- Scan tool 187
- General scan tool P1486
- MIL 31

Fault Message
- EVAP Leak Monitor Pinched Hose Found

Background
- The PCM monitors that the fuel tank, purge lines, etc. are sealed well.
- When monitoring, the PCM pressurizes the purge lines by activating the evaporative emission ventilation solenoid with the canister ventilation valve (incorporated in the solenoid) closed.
- If the fuel tank and purge lines are sealed correctly, the pressure will rise well by activating the solenoid specific times.
- After the pressure rises well, the diaphragm inside the solenoid will not work any more.
- If the hoses are pinched, the pressure will rise well by activating the solenoid only fewer times.

Range of Check/Set Condition
- The evaporative emission ventilation solenoid has been activated less than specific times.

Probable Cause
- Clogged hoses between the evaporative emission ventilation solenoid and the fuel tank
- Evaporative emission ventilation solenoid failed
- PCM failed