The battery passed a load test and then to make sure I hooked up my charger and tried to start it with no luck.
Next step was swapping in a new red stripe relay, no luck. I got out my VOM but the ohms results made no sense. On both the original and the new one I got no continuity with black on 85 and red on 86. Reversing the leads gave very low readings ~0.15. Is it possible they're both toast?
If its not the red stripe relay then the next thing to check is the crank sensor. Any diagrams and tips?
yes you only get a reading ONE way on the diode relay, BUT you should get 770 ohms with black on 85 and red on 86 (you are sure you set the VOM to ohms, say 2000 ohms, for it to read within the correct scale?)
was it an original bosch relays, red stripe? or alternative? if alternative, what type and number?
EDIT: check the 3 other relays as well....they are important especially the AUX motronic relay....on these you should get 70-80 ohms between #85 & #86 (with these it doesn't matter which way around)
The tests for the CPS are as follows:
ohms test: at the plug up by the windscreen washer fluid filler neck...3 pin plug....between an outside pin and the middle pin you should get between 500-600 ohms....if no reading, try the other outside pin to middle.
volts test: clip your OVM to the same 2 pins that gave the omhs reading, set it to volts AC (not DC!), now crank the engine: you should get 1.4V AC
ECU supply voltage to CPS test: set VOM this time to Volts DC; IGN OFF clip VOM to middle and outer pin of HARNESS side of plug (ie. going back to ECU)...only now turn on ignition....you should get 4.4V DC
if you get the above the CPS is very likely OK.
Last test is visual......unscrew the CPS (one allen head bolt) and pull it out the mount.....inspect the tip for build up of crud, and clean if so.