Diagnosis and Testing
| DTC | Possible Causes | Action |
|---|---|---|
| P0442, P0455 | Check for correct connection | Go To PINPOINT TEST A |
| P0443 | Check the resistance of the EVAP canister purge valve | Go To PINPOINT TEST B |
| P1451 | Check the resistance of the canister close valve | Go To PINPOINT TEST C |
| P0452, P0453 | Check the fuel tank pressure sensor supply voltage | Go To PINPOINT TEST D |
DIAGNOSTIC TROUBLE CODE INDEX
- Verify the customer concern by operating the system.
- Visually inspect for obvious signs of mechanical or electrical damage.
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the concern is not visually evident, use a fault code reader to retrieve fault codes before proceeding to the Symptom Chart in the appropriate article.
Diagnostic Trouble Codes
DTC P0442
Possible Source(s)
- Evaporative emission control system leak detected (small leak) Action(s) to take: GO to «PINPOINT TEST A»(ref-199544-S07584441192005101900000) .
DTC P1450
Possible Source(s)
- Unable to bleed up fuel tank vacuum Action(s) to take: CHECK all fuel vapor hoses for blockage. INSTALL new components. CLEAR DTC. TEST the system for normal operation. CHECK EVAP canister for plugging or blockage. INSTALL new components. CLEAR DTC. TEST the system for normal operation. CHECK EVAP canister purge valve for blocked passageway. INSTALL new components. CLEAR DTC. TEST the system for normal operation.
DTC P0443
Possible Source(s)
- Evaporative emission control system purge control valve circuit malfunction Action(s) to take: GO to «PINPOINT TEST B»(ref-199544-S27262000602005101900000) .
DTC P1451
Possible Source(s)
- Evaporative emission control system vent control valve circuit malfunction Action(s) to take: GO to «PINPOINT TEST C»(ref-199544-S09395800162005101900000) .
DTC P0451
Possible Source(s)
- Evaporative emission control system pressure sensor range/ performance Action(s) to take: INSTALL a new fuel tank pressure sensor
DTC P0452
Possible Source(s)
- Evaporative emission control system pressure sensor low input Action(s) to take: GO to «PINPOINT TEST D»(ref-199544-S28408076792005101900000) .
DTC P0453
Possible Source(s)
- Evaporative emission control system pressure sensor high input Action(s) to take: GO to «PINPOINT TEST D»(ref-199544-S28408076792005101900000) .
