ok guys weird question i have checked the splices in the harness for the common problems now to the stuff i noticed about my 93 5.2 4x4 fisrt things first asd is switching of it would seem a few seconds after the turn of the key but when testing to the harness plug for the coil it checks out there. the coil is testing .50 ohms the two plug prongs and 11k ohms from top terminal to either of the two plug prongs. i only have code 12 repetedly from the computer no starting code just a code 12 and closing code 55 even if i disconnet cam or crank sensor havent tried both at once. i thought would at least get me a code. any ideas? one more thing i noticed even with asd off im still getting fuel into the motor.observed this with the cap off a relay and have tried switching relay the 40 amp fuse to the asd also test good.

ok thought id add the cam sensor reading from plug connector face up center to right or b and c is infinity center to left or b and a is 16 crank sensor is a and b 20. b and c is 2.6. also the truck started and died right away within a few seconds 2 times in 3-4 days then just quit all together

 

Get out a volt meter and test for proper voltage at all the circuits like ASD Fuel pump coil ect ect.

 

ok will do not sure on exact procedure to test asd and coil since asd shuts down few seconds after startup fuel pump does check ok

 

hey guys found this little bit for checking the circuits between crank sensor and pcm i thought it was easy to understand and im not very electricaly inclined

TEST NS-9A - REPAIRING FAULT "NO REFERENCE SIGNAL DURING CRANKING"

1.Disconnect crank position sensor, located on engine block at rear of right cylinder head. Turn ignition on. Place DRB-II in voltmeter mode. Probe Gray/Black wire in crank position sensor connector. If voltage is greater than 4.5 volts, go to step 4). Turn ignition off. Disconnect engine controller 60-pin connector. Place DRB-II in ohmmeter mode.

2.Probe engine controller connector terminal No. 24 (Gray/Black wire). If resistance is less than 10 ohms, repair Gray/Black wire for a short to ground. Perform VERIFICATION TEST VER-1. If resistance is 10 ohms or more, check continuity of Gray/Black wire between engine controller and crank position sensor connectors.

3.If resistance is less than 10 ohms, replace engine controller. Perform VERIFICATION TEST VER-1. If resistance is 10 ohms or more, repair open Gray/Black wire. Perform VERIFICATION TEST VER-1.

4.If voltage is greater than 4.5 volts in step 1), probe Orange wire in crank position sensor connector. If voltage is 7.5 volts or less, go to step 6). If voltage is greater than 7.5 volts, turn ignition off. Place DRB-II in ohmmeter mode.

5.Probe Black/Light Blue wire in crank position sensor connector. If resistance is less than 10 ohms, replace crank position sensor. Perform VERIFICATION TEST VER-1. If resistance is 10 ohms or more, repair Black/Light Blue wire for an open to splice. Perform
VERIFICATION TEST VER-1.

6.If voltage in step 4) is 7.5 volts or less, turn ignition off. Disconnect engine controller connector. Place DRB-II in ohmmeter mode. Probe engine controller connector terminal No. 7. If resistance is less than 10 ohms, repair Orange wire for a short to ground. Disconnect battery quick disconnect. Reconnect battery quick disconnect. Perform VERIFICATION
TEST VER-1.

7.If resistance is 10 ohms or more, check Orange wire for continuity between engine controller and crank position sensor connectors using a DVOM. If resistance is less than 10 ohms, replace engine controller. Perform VERIFICATION TEST VER-1. If resistance is 10 ohms or more, repair Orange wire. Perform VERIFICATION TEST VER-1.


VERIFICATION TEST VER-1
1.Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. Attempt to start engine. If engine does not start, return to TEST NS-1A.

2.If engine starts, engine controller was changed and vehicle is equipped with factory theft alarm, start vehicle at least 20 times so alarm system may be activated when desired. Write vehicle mileage from its odometer to memory location within replacement engine controller. This will enable new engine controller to operate Emission Maintenance Reminder (EMR) light properly. On all models, no-start condition is corrected and repair is now complete.

3.If engine starts and engine controller has not been changed, connect DRB-II to engine diagnostic connector, and erase faults. No-start condition has been corrected and fault messages have been erased. Repair is now complete. If repaired fault has reset, check if any TECHNICAL SERVICE BULLETINS (TSBs) apply to vehicle. Return to TEST DR-1A if
necessary. If another fault exists, return to TEST DR-1A and follow path specified by other fault.