Need help with DTC readiness checks
Need help with DTC readiness checks Need some tips on getting my EVAP, O2 Sensor. and O2 sensor heater ready. I've got an '06 vette with LT headers. The rear O2's are set to "3 -no error reported" but SES enabled. I drove over 200 miles since flashing the PCM with a tune change and they're still not ready.
No DTC's Detected
Continuous Tests
Misfire: Complete
Fuel System: Complete
Comprehensive Component: Complete
Once Per Trip Tests
Catalyst: Complete
Heated Catalyst: n/a
Evaporative System: Incomplete
Secondary Air System: n/a
A/C System Refrigerant: n/a
Oxygen Sensor: Incomplete
Oxygen Sensor Heater: Incomplete
EGR System: n/a
No DTC's Detected
Continuous Tests
Misfire: Complete
Fuel System: Complete
Comprehensive Component: Complete
Once Per Trip Tests
Catalyst: Complete
Heated Catalyst: n/a
Evaporative System: Incomplete
Secondary Air System: n/a
A/C System Refrigerant: n/a
Oxygen Sensor: Incomplete
Oxygen Sensor Heater: Incomplete
EGR System: n/a
Last edited by turboffr; May 8, 2010 at 06:51 PM.
For the O2 heater, your coolant temp needs to be below 120 degrees to make the 02 heaters work. I dont think the readiness test will complete without feedback from the rear O2's.
Here is what I used to complete the readiness test.
The OBD-II drive cycle begins with a cold start (coolant temperature below 122 degrees F and the coolant and air temperature sensors within 11 degrees of one another).
NOTE: The ignition key must not be on prior to the cold start otherwise the heated oxygen sensor diagnostic may not run.
Here is what I used to complete the readiness test.
The OBD-II drive cycle begins with a cold start (coolant temperature below 122 degrees F and the coolant and air temperature sensors within 11 degrees of one another).
NOTE: The ignition key must not be on prior to the cold start otherwise the heated oxygen sensor diagnostic may not run.
- As soon as the engine starts, idle the engine in drive for two and a half minutes with the A/C and rear defrost on. OBD-II checks oxygen sensor heater circuits, air pump and EVAP purge.
- Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle. OBD-II checks for ignition misfire, fuel trim and canister purge.
- Hold at a steady state speed of 55 mph for three minutes. OBD-II monitors EGR, air pump, O2 sensors and canister purge.
- Decelerate (coast down) to 20 mph without braking or depressing the clutch. OBD-II checks EGR and purge functions.
- Accelerate back to 55 to 60 mph at half throttle. OBD-II checks misfire, fuel trim and purge again.
- Hold at a steady speed of 55 to 60 mph for five minutes. OBD-II monitors catalytic converter efficiency, misfire, EGR, fuel trim, oxygen sensors and purge functions.
- Decelerate (coast down) to a stop without braking. OBD-II makes a final check of EGR and canister purge.
