Service Drive Cycles

Overview
The "Service Drive Cycle" procedure confirms the presence of a fault(s), successful repair and clears reported DTC(s) from the ECM. It is not necessary to test the whole vehicle system through its complete range of performance for each DTC. Only one test (Cycle 4) requires the vehicle to be driven. It is recommended that the Drive Cycle is included in the post repair road test.

The following tables are numerically formatted into four specific cycles which cover all the conditions necessary to fulfil the "Service Drive Cycle."

Procedure
It is very important to establish a standard routine when diagnosing and rectifying engine management related faults. Suggested steps are:
1. Ensure that the battery and charging system are in good order.
2. Verify the presence of DTC(s).
3. Record DTC(s) and Freeze Frame data using form JJM-106399/50 or S93, according to market.
4. Disconnect the battery ground lead.
5. Rectify known or recorded faults.
6. Perform the relevant Drive Cycle as detailed in the following lists; not forgetting any unrelated road test procedure.
7. Check for remaining, or further DTC(s).
8. Rectify or release the vehicle as appropriate.

It is most important to remember that upon disconnection of either the battery or ECM, DTCs will be "lost ;" therefore observe step #3. This advice is given knowing that PDU will retain vehicle details until the memory is cleared, but generic scanners may not.

Using the Tables
In order that DTCs may be cleared effectively and quickly, locate the appropriate code(s) listed in the tables and follow the instruction. In the case of multiple reported codes, which fall in more than one cycle, begin with the cycle(s) that require the vehicle to be driven and thus exercise the diagnostic more thoroughly.

Drive Cycle 1