Wiring issue

[geobrookehil]

I just bought a 98 Wrangler. The prior owner changed the engine and it turns over but doesn't start. I've change all sensors and coil. Here is my question. The Sensor Ground wire on the cam sensor and the crank sensor are not showing continuity to ground. So I checked the Sensor Ground pin on the Power Control Mod. and no ground there either. Should there be continuity to ground on these wires and to that pin?

 

[DOUBLEC]

I just bought a 98 Wrangler. The prior owner changed the engine and it turns over but doesn't start. I've change all sensors and coil. Here is my question. The Sensor Ground wire on the cam sensor and the crank sensor are not showing continuity to ground. So I checked the Sensor Ground pin on the Power Control Mod. and no ground there either. Should there be continuity to ground on these wires and to that pin?

I have a CJ7 that I did a head swapp off of a 91 XJ. During the harness swapp I couldn't figure what was what (haynes manual really suck). So I ohmed out each wire / color code / pin #, yeah no life here. Different ECU's but Jeep kinda followed the same sensor style setup . The sensor grounds are originate at the ECU, in my case black with blue trace that are tied internally in the ECU to a ground wire that connects to chassis. To answer your question yes it should go to ground.

If possible, pull the plug on a couple of sensors easy to get to, figure which color is ground and see if they make continunity. If so you will need to trace the ground wire back where the cps ties in (or dosen't). Note: the cps and disty sync siginal should be tied together.

I have drawings for te 91-96 XJ but I don't think it would do you any good.

 

[geobrookehil]

Thanks for your message. I have all the drawings. What is the disty sync siginal?
Pin # 4 on the ECU is where the sensor grounds feed to and that has no ground on it. Do you thing I can just ground these wires to a different ground wire.
Also confusing is with the key on all three wires (5 volt supply, Sensor signal & sensor ground all show a 5 volt reading????

 

[DOUBLEC]

Thanks for your message. I have all the drawings. What is the disty sync siginal?
Pin # 4 on the ECU is where the sensor grounds feed to and that has no ground on it. Do you thing I can just ground these wires to a different ground wire.
Also confusing is with the key on all three wires (5 volt supply, Sensor signal & sensor ground all show a 5 volt reading????

Looks like the wiring is similar, I'll reference what I have below. Keep in mind yours may be different pin numbers.

You need to have the ECU tied to chassis ground. There are two points that have heavier gauge wires, pin 11 and 12 that need to be tied to chassis. The sensor grounds are tied internally including the diag connector pin 5. You could tie the ground to chassis somewhere else but I wouldn't do that, you have to consider return current vs wire size. Check the ECU ground first, most likely this will correct your problem.

To clarify, the ECU receives a signal from the CPS and a sync signal from the distributor. Both of these signals are tied together in the wire harness and a single wire goes back to the ECU. Without this your engine won't fire. This was just a side note.

 

[carnuck]

Doesn't '97 have the encoded key?