I have a couple of friends that have used this method. Maybe it will help you as well.
http://educ.ubc.ca/faculty/pmirenda/ToiletTraining/toilet_training.01.htm
Here is the info summarized:
It is borrowed from a book called Toilet Training for Everyone
The author Pat Mirenda
1) For one week, check your child's diaper every 15 minutes through out the waking day. Chart when it is wet or spoiled.
2) Look at the chart and calculate the average period of dryness between urination. also look for patterns ~ do they wet themselves right after meals? right after naps? Is there a usual time of day they have a bowel movement?
3) Create a schedule based on your findings. e.g. start right after rising from bed and every 1 1/2 hours after that. You may need to alter the schedule to go 10 minutes after a meal and again after a nap
4) Purchase big boy/girl underwear and waterproof pants in case of accidents. This ensures the child will feel wet if they have an accident
5) Read the social story to your child twice a day for several days. The social story is a series of laminated cards that show in pictures the journey of going to the bathroom. You can see them on the link above or click on this link
6) Have an auditory timer and set it for 5 minutes before the expected time they will need to go
7) Take the child to the toilet every time the timer rings, regardless of where you are. This ensures the child will learn to use the toilet everywhere when required. Use the social story and walk through each step as you do it.
8 ) If your child has an accident, say nothing, just clean them up and start your timer from the point for the next period of time
9) When your child has a success, celebrate with praise, assurance and then give them the reward you have decided upon. This reward is only given when they actually do something in the toilet, not for just sitting. If it is a toy or activity limit it to 5 minutes so that it will retain its reward quality
10) When your child has achieved being dry for two weeks on a schedule begin to stretch the time by 5 minutes a day. You are hoping for them to begin attending to their own signals and initating that they need to go. You might begin to notice signs they are feeling the need to wiggle. Bring it to their attention. This way they learn to attend to and interpret their own state
11) Expect accidents at first. Be patient ~ this is a learning process
12) When the child is fully trained for two weeks you can start phasing out the reward. If it is an activity or toy you will be able to just let them have it for longer until it is no longer important to them to have it.
You may choose to do bladder training first and bowel training separately using the same method.