Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Monitor Result
The monitor result (mode 06) allows the OBD II scan tool to display the monitor status, test value and test limit.
A problem in the EVAP system can be found by comparing the test value and test limit. This procedure is described in "CHECKING MONITOR STATUS " (see ). Check the monitor result after running the vehicle with monitor drive pattern (Refer to " ").
- TID (Test Identification) is assigned to each emission-related component.
- TLT (Test Limit Type):
If TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
- CID (Component Identification) is assigned to each test value.
- Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.
TID $02: EVAP - Key-off Monitor
| TLT | CID | Unit Conversion | Description of Test Value | Description of Test Limit | ||
|---|---|---|---|---|---|---|
| 1 | $01 | Multiply by 0.01 [kPa] | Test value for small leak (P0456) Refer to pressure D(1) | Malfunction criterion (0 kPa) | ||
| $02 | Test value for gross leak (P0455) Refer to pressure E(1) | |||||
| $03 | Test value for vacuum pump stuck OFF (P2401) Refer to pressure A(1) | |||||
| $04 | Test value for vacuum pump stuck ON (P2402) Refer to pressure A(1) | |||||
| $05 | Test value for vent valve stuck OFF (vent) (P2420) Refer to pressure C(1) | |||||
| $06 | Test value for vent valve stuck ON (P2419) Refer to pressure A(1) | |||||
| $07 | Test value for 0.02 inch orifice low flow (P043E) Refer to pressure B(1) | |||||
| $08 | Test value for 0.02 inch orifice high flow (P043F) Refer to pressure A(1) | |||||
| $11 | Test value for purge VSV stuck closed (P0441) Refer to pressure F(1) | |||||
| $12 | Test value for purge VSV stuck open (P0441) Refer to pressure E(1) | |||||
| $13 | Test value for purge flow (P0441) Refer to pressure G(1) | |||||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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