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
Refer to CHECKING MONITOR STATUS .
The test value and test limit information are described as shown in the following table. Check the monitor result and test values after performing the monitor drive pattern (refer to "READINESS MONITOR DRIVE PATTERN ").
- MID (Monitor Identification Data) is assigned to each emissions-related component.
- TID (Test Identification Data) is assigned to each test value.
- Scaling is used to calculate the test value indicated on generic OBD II scan tools.
| MID | TID | Scaling | Description |
|---|---|---|---|
| $3D | $CB | Multiply by 0.001 {kPa} | Test value for vacuum pump OFF stuck (P2401) |
| $CD | Multiply by 0.001 {kPa} | Test value for vacuum pump ON stuck (P2402) | |
| $CE | Multiply by 0.001 {kPa} | Test value for vent valve OFF stuck (P2420) | |
| $CF | Multiply by 0.001 {kPa} | Test value for vent valve ON stuck (P2419) | |
| $D0 | Multiply by 0.001 {kPa} | Test value for reference orifice low-flow (P043E) | |
| $D1 | Multiply by 0.001 {kPa} | Test value for reference orifice high-flow (P043F) | |
| $D4 | Multiply by 0.001 {kPa} | Test value for purge VSV close stuck (P0441) | |
| $D5 | Multiply by 0.001 {kPa} | Test value for purge VSV open stuck (P0441) | |
| $D7 | Multiply by 0.001 {kPa} | Test value for purge flow insufficient (P0441) | |
| $D8 | Multiply by 0.001 {kPa} | Test value for canister small leak (P1420) | |
| $D9 | Multiply by 0.001 {kPa} | Test value for canister gross leak (P1421) | |
| $DA | Multiply by 0.001 {kPa} | Test value for fuel tank small leak (P1422) | |
| $DB | Multiply by 0.001 {kPa} | Test value for fuel tank gross leak (P1423) | |
| $DC | Multiply by 0.001 {kPa} | Test value for fuel vapor-containment valve close stuck (P2451) | |
| $DD | Multiply by 0.001 {kPa} | Test value for fuel vapor-containment valve open stuck (P2450) |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.