Engine Won't Start, Check Engine Light (CEL) Doesn't Come On:
1. Engine won't start.
2. Turn ignition switch ON and observe CEL.
3. If CEL never comes on, even for two seconds, after ignition is turned ON, observe Low Oil Pressure Light (LOPL).
4. If LOPL doesn't come on, inspect Back Up Light Fuse in under-hood fuse/relay box. If bad, replace; otherwise, repair open in YEL wire between Back Up Light Fuse and gauge assembly.
5. Turn ignition switch ON.
6. Is CEL on? No, replace CEL bulb or repair open in GRN/ORN wire between ECM (A13) and gauge assembly. Yes, measure voltage between ground and terminals A23 and A24, individually.
7. Is there less than 1.0 volt? No, repair open in wire between ECM and main ECM ground that had more than 1.0 volt. Yes, substitute a known-good ECM
It might help you to also read sections A and B below:
http://www.askmehelpdesk.com/cars-tr...das-46563.html