Readiness Code

Readiness code description

Diagnostics are performed at regular intervals during normal vehicle operation. After repairing an emissions related system, a readiness code is generated by road testing the vehicle.

If a malfunction is recognized during the drive cycle, it will be stored in the DTC memory.

The OBD drive cycle operation will be monitored with a hand held diagnostic tool. Consult the manufacturer's instruction manual for correct tool operation.

The readiness code is erased every time the DTC memory is erased or any time the battery is disconnected. If the DTC memory has been erased or the battery is disconnected, a new readiness code must be generated.

Only erase the DTC memory if a DTC has been stored.

General recommendations

Most monitors will complete easier and quicker using a "steady-foot" and "smooth" acceleration during the drive cycle operation.

Operating conditions

During the sequence, avoid switching ignition OFF to keep from unnecessarily extending the drive profile. Depending on drive profile, the described bits can be set beforehand. In this case, the corresponding point can be skipped. During the individual test steps, the vehicle needs to be in normal mode, except at the end during service regeneration.

NOTE:

Do not assume that the scan tool ID and engine code are correct if the scan tool communicates. The scan tool does not use the ID to establish communication-the units are automatically identified.

Test requirements

NO DTC in memory
Switch OFF all electrical and electronic accessories
Necessary driving speed: 50 - 70 mph
Drive profile takes Approx. 60- 90 min.

Readiness Drive Cycle Procedure

-- CONNECT: Scan Tool

NOTE:

During the individual test steps, the vehicle needs to be in normal mode, except during service regeneration.

For automatic transmission use the manual gear selection mode, if available for the following steps.

Step	Procedure	Result/Action to Take
1	Misfire Monitoring: START: Engine and let idle for 20 s	Misfire Monitor Ready
2	PM Filter Monitoring: DRIVE: Strong acceleration phase 1500 - 3500 RPM for at least 10 s in 3rd or 4th Gear DRIVE: vehicle until the oxygen sensors are active (signal voltage > 0.10 V)	PM Filter Monitoring Ready
3	EGR System Monitoring: DRIVE: continuous speed of 65+ mph in 5th or 6th gear, if possible with cruise ON. DRIVE: constant speed in 3rd gear at 1800 RPM for 20 s COAST: 8 s (EGR system monitoring reaches 300° C)	EGR System Monitoring Ready
4	NMHC Catalyst Monitoring: START: DPF service regeneration (access authorization), DPF light must light up The vehicle must be driven Approx. 5 minutes at a constant speed of 50- 70 mph, preferably with Cruise Control, avoid deceleration and coasting. MONITOR: PM Filter reaches > 575° C, then drive for additional 150 s, stop and idle for 60 s and continue with regeneration until DPF Lamp shuts OFF.	NMHC Catalyst Monitoring Ready
5	NOx/SCR After-treatment (Regeneration) Monitoring: DRIVE: 30-40 min. at constant speed, 50-70 mph in 5 - 6th gear for 2 mins. No Coasting.	NOx/SCR After-treatment (Regeneration) Monitoring Ready
6	Exhaust Gas Sensor Monitoring: DRIVE: vehicle until coolant temperature > 70° C, temperature behind diesel particulate filter > 300° C. IDLE: without steering movement Approx. 30 s DRIVE: light acceleration at Approx. 2500 RPM in 4th gear, rapidly take foot from gas and coast for about 10 s and repeat COAST: at 3000 RPM in 4th gear (min. 10 s) DRIVE: 30-45 min, at constant speed 50-70 mph in 5 - 6th gear.	Exhaust Gas Sensor Monitoring
7	Boost Pressure System Monitoring: DRIVE: 30-45 min, at constant speed 50-70 mph in 5 - 6th gear.	Boost Pressure System Monitoring Ready

NOTE:

Depending on the scan tool used. The readiness code status may be displayed as complete, passed or OK. At an exterior temperature < 7° C, the setting of the readiness for the NOx catalytic converter test is delayed. Here the vehicle must be Driven considerably longer.

Readiness Codes and Monitoring Completed

If any engine monitor fails the drive cycle test. Repeat the drive cycle test until all engine monitors have successfully run through and passed.
If the drive cycle operation fails again.
Check the DTC memory for stored DTCs.
Repair the vehicle if necessary.
Repeat the drive cycle operation until all engine monitors have successfully run through and passed.
Remove the scan tool and switch the ignition off.