Readiness Code (USA/CDN)
Readiness Code (USA/CDN)
Checking malfunction indicator lamp (MIL) visually
No diagnostic trouble codes (DTCs) which light the malfunction indicator lamp (MIL) may be stored in the engine control module (ECM) before the status of "readiness" is read off.
Therefore visually check that the malfunction indicator lamp (MIL) is lit.
Hint: The malfunction indicator lamp (MIL) is always lit with the ignition on. Carry out the check with the engine idling.
Select the appropriate remedy depending on the malfunction indicator lamp (MIL) status:
1. Malfunction indicator lamp (MIL) lit
2. Malfunction indicator lamp (MIL) not lit.
Select alternative according to above.
1 - Diagnostic trouble code (DTC) stored in the engine control module (ECM)
2 - engine control module (ECM)
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Reading off Readiness Code, engine control module (ECM)
Read off the status of Readiness Code in the engine control module (ECM).
Hint: Readiness is reset (to "Not ready") when the diagnostic trouble codes (DTCs) are erased or if the power to the engine control module (ECM) is switched off.
Status "Ready" for all groups means that Readiness Code is "Ready". This confirms that affected diagnostic functions have been carried out, without the engine control module (ECM) detecting any faults during one operating cycle.
The United States Environmental Protection Agency (EPA) has issued a guidance letter, "Performing Onboard Diagnostic System checks as Part of a Vehicle Inspection and Maintenance Program" (EPA420-R-01-015 June 2001), that incorporates various implementation issues associated with OBD-I/M testing. One being that the EPA has revised the readiness criteria to allow States to not reject MY 1996-2000 vehicles with two or fewer unset readiness codes, or MY 2001 and newer vehicles with no more than one unset readiness code. As mentioned herein this is suggested practice. Each individual State may abide by this guidance or enforce State regulations suited to their individual environmental needs. Please consult your State Department of Motor Vehicles for your current I/M testing regulations and procedures.
Select the appropriate remedy depending on the read status:
1. Readiness status is "Ready" for all groups
2. Readiness status is "Not ready".
Select alternative according to above.
1 - The vehicle is ready for delivery
2 - Corrective action to achieve "Ready"
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Corrective action to achieve "Ready"
The United States Environmental Protection Agency (EPA) has issued a guidance letter, "Performing Onboard Diagnostic System checks as Part of a Vehicle Inspection and Maintenance Program" (EPA420-R-01-015 June 2001), that incorporates various implementation issues associated with OBD-I/M testing. One being that the EPA has revised the readiness criteria to allow States to not reject MY 1996-2000 vehicles with two or fewer unset readiness codes, or MY 2001 and newer vehicles with no more than one unset readiness code. As mentioned herein this is suggested practice. Each individual State may abide by this guidance or enforce State regulations suited to their individual environmental needs. Please consult your State Department of Motor Vehicles for your current I/M testing regulations and procedures.
Carry out the following corrective actions so that the engine control module (ECM) can carry out the diagnostic functions in each group. Start reading off the Readiness Code again.
Hint: Verifying repairs Verifying Repairs
Hint: The following instructions do not provide any guarantee that all diagnostic functions shall work. Special circumstances with regard to surroundings amongst other things can change the conditions. Read more on conditions for various diagnostic functions in the diagnostic trouble code (DTC) information.
Readiness status: Misfire - Not ready
1. Engine idling for up to 30 seconds
2. Ignition off
3. Ignition on.
Readiness status: Fuel system - Not ready
1. Run the engine at operating temperature (approx. 80 °C)
2. Engine idling for up to 30 seconds
3. Ignition off
4. Ignition on.
Readiness status: Catalyst - Not ready
1. Run the engine at operating temperature (approx. 80 °C)
2. Test drive the car. Drive the vehicle (normal road load) at a constant speed around 70-90 km/h for approx. 30-40 seconds
3. Ignition off
4. Ignition on.
Readiness status: Evaporative system - Not ready
1. Run a quick test of the fuel tank system via the vehicle communication socket.
Note! When carrying out a quick test on the fuel tank system, where none of the starting conditions for normal leak diagnosis apply, no diagnostic trouble codes (DTCs) are stored in the engine control module (ECM). The information for readiness is not updated. It can therefore be difficult to obtain readiness "Ready" for the Evaporative group system in the workshop.A fault-free leakage test using "Quick test of the fuel tank system" provides the correct status of the leak diagnostic unit and the fuel tank system, and if the car is driven normally for a few days, the leak diagnostic is run and the readiness information is updated to "Ready".
Hint: For further information about start conditions for leakage diagnosis, see relevant diagnostic trouble code (DTC) information.
2. EVAP canister control is also included in the Evaporative system readiness group. The engine must be run to operating temperature and then left idling for a few minutes before the diagnostic function for EVAP control can be run.
Readiness status: Oxygen sensor - Not ready
1. Run the engine at operating temperature (approx. 80 °C)
2. Test drive the car. Drive the vehicle (normal road load) at a constant speed around 70-90 km/h for approx. 30-40 seconds
3. Ignition off
4. Ignition on.
Readiness status: Comprehensive component - Not ready
1. Leave the engine switched off until the engine coolant temperature (ECT) is below 50 °C.
Hint: Opening the hood speeds up cooling.
2. Start the engine and complete a TRIP in an ambient temperature above -10 °C. Carry out according to: Verifying repairs Verifying Repairs
3. Ignition off
4. Ignition on.
Continue - The vehicle is ready for delivery
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Diagnostic trouble code (DTC) stored in the engine control module (ECM)
Fault-trace and remedy stored diagnostic trouble codes (DTCs).
Hint: For information about diagnostic trouble codes (DTCs) that light the malfunction indicator lamp (MIL), see diagnostic trouble code (DTC) information for the relevant diagnostic trouble code (DTC).
Continue - ANOTHER TEST
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The vehicle is ready for delivery
The following has been determined:
- The engine control module (ECM) does not have any stored diagnostic trouble codes (DTCs) which light the malfunction indicator lamp (MIL)
- Readiness Code is "Ready". This confirms that affected diagnostic functions have been carried out, without the engine control module (ECM) detecting any faults during one operating cycle.
The United States Environmental Protection Agency (EPA) has issued a guidance letter, "Performing Onboard Diagnostic System checks as Part of a Vehicle Inspection and Maintenance Program" (EPA420-R-01-015 June 2001), that incorporates various implementation issues associated with OBD-I/M testing. One being that the EPA has revised the readiness criteria to allow States to not reject MY 1996-2000 vehicles with two or fewer unset readiness codes, or MY 2001 and newer vehicles with no more than one unset readiness code. As mentioned herein this is suggested practice. Each individual State may abide by this guidance or enforce State regulations suited to their individual environmental needs. Please consult your State Department of Motor Vehicles for your current I/M testing regulations and procedures.
Hint: Readiness is reset (to "Not ready") when the diagnostic trouble codes (DTCs) are erased or if the power to the engine control module (ECM) is switched off.
Continue - ANOTHER TEST
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