[Spokes]

Ok before I get flamed about searching I have and keep finding the same stuff...

So...

Jeep is throwing code P1694 but no CEL..

Here's the problem. My '00 won't start, it cranks, has fuel, spark, and air. The CPS is new and has resistance so it's not shorting out. I have done the CPS test where it should move volts and gas gauge but that does not work. The weird thing is when the key is 'on' the aux fan is running leading me to believe that something with the computer is funky causing the motor to think its running and turn the fan on cause it doesn't know what going on. (Like unplugging thermostate plug on thermostate housing)

Sometimes the fan will surge and for one long shot the jeep did start, than I shut it off and that's it. The ASD and cooling fan relays are all good. My dad has a '00 xj also and I borrowed his relays and still the same issues. My relays in his work fine so I doubt that is the problem. I didn't get to pull the wires to the relays/fuses though. The rear o2 relay seems to click when the aux fan is on. The wires to both o2 sensors look 100% no tears or melting or anything.

I did get with the old CPS a 'no bus' message on odemeter haven't gotten it with new CPS however. The cluster will to the test process if you hold down the mileage reset button and turn the key on. So the cluster is good. I can't see a loose connection to th cluster causing it not to start. And if it was the connection I feel like I would get a 'no bus' message.

Like I've said I've done A LOT of researching, all sign point to CPS but the wires and CPS are good it seems. ALL fuse are good, inside and out and the relays under the hood.

Any new ideas would be much appreciated! Thanks!!! :thumbsup:

 

[CCKen]

P1694 without CEL is "Fault in Companion Module". No CCD/J1850 messages received from the powertrain control module-Aisin transmission.

Possible Causes:

INTERMITTENT WIRING AND/OR CONNECTORS
CCD BUS (+) CIRCUIT OPEN TO PCM
CCD BUS (-) CIRCUIT OPEN TO PCM
TCM - CCD BUS OPEN

There may be wiring problem between the PCM and the TCM.

Generally, the connectors on the PCM and TCM should be removed and inspected for corrosion on the connector pins and pin cavities.

PCM Connector C1 (Black connector) carries most of the critial engine performance data. Connector C3 (Gray) carries the radiator fan control, ASD, and CCD Bus data. This is another candidate for corrosion problems.

Check all three PCM connectors.

The TCM conector is pretty much protected from the elements and generally doesn't corrode (unless the Heep went for a deep swim). The TCM does fail however, but it would normally trigger a CEL along with a P7XXX code.

If the PCM connectors look corrosion free (including behind the covers on the backs of the connectors), you will need to do deeper troubleshooting with a digital volt/ohmmeter.

 

[CJ7-Tim]

Did you buy a genuine Jeep CPS ?

Often a P1694 is caused by the CPS or CPS wires. Keep in minds that any fault/failure/short circuit of any 5 volts sensor on the CCD/BUS may show up as a P1694.

The e-fan running at the wrong time points to a short circuit.

If you have a no-bus and the engine runs that is a instrument cluster issue. If you have a no-bus and the engine does not run, that is most likely a CPS issue.

When the CPS short circuits the engine computer (PCM) shuts down to prevent damage to itself. As a result, there is no communication (P1694).
Disconnect your crankshaft position sensor then put the ignition key in the on position. If the instrument cluster voltage and gas gauges start to work once the CPS is disconnected, then you know the CPS or CPS wires are shorted and is the root cause of the code or codes. You can verify this by testing the CPS and checking continuity and voltage on the CPS wires.

 

[Spokes]

P1694 without CEL is "Fault in Companion Module". No CCD/J1850 messages received from the powertrain control module-Aisin transmission.

Possible Causes:

INTERMITTENT WIRING AND/OR CONNECTORS
CCD BUS (+) CIRCUIT OPEN TO PCM
CCD BUS (-) CIRCUIT OPEN TO PCM
TCM - CCD BUS OPEN

There may be wiring problem between the PCM and the TCM.

Generally, the connectors on the PCM and TCM should be removed and inspected for corrosion on the connector pins and pin cavities.

PCM Connector C1 (Black connector) carries most of the critial engine performance data. Connector C3 (Gray) carries the radiator fan control, ASD, and CCD Bus data. This is another candidate for corrosion problems.

Check all three PCM connectors.

The TCM conector is pretty much protected from the elements and generally doesn't corrode (unless the Heep went for a deep swim). The TCM does fail however, but it would normally trigger a CEL along with a P7XXX code.

If the PCM connectors look corrosion free (including behind the covers on the backs of the connectors), you will need to do deeper troubleshooting with a digital volt/ohmmeter.

Ok. I'll will check all the connectors. Where exactly is the TCM located so I can inspect it.

Did you buy a genuine Jeep CPS ?

Often a P1694 is caused by the CPS or CPS wires. Keep in minds that any fault/failure/short circuit of any 5 volts sensor on the CCD/BUS may show up as a P1694.

The e-fan running at the wrong time points to a short circuit.

If you have a no-bus and the engine runs that is a instrument cluster issue. If you have a no-bus and the engine does not run, that is most likely a CPS issue.

When the CPS short circuits the engine computer (PCM) shuts down to prevent damage to itself. As a result, there is no communication (P1694).
Disconnect your crankshaft position sensor then put the ignition key in the on position. If the instrument cluster voltage and gas gauges start to work once the CPS is disconnected, then you know the CPS or CPS wires are shorted and is the root cause of the code or codes. You can verify this by testing the CPS and checking continuity and voltage on the CPS wires.

It is just an advanced auto cps. As i said in the op I have checked the cps and am not getting any feedback from in. Unconnected with the key on I still do not get anything on the cluster. And its not shorting out I checked for continuity. I got no bus with old cps since replacing it j have not seen no bus in many many many cranks lol

I had an issue about a year ago where the jeep ran like **** due to some water in the one pcm connector. I will check all connections and throw some more dialectical grease on them again.

 

[CJ7-Tim]

Cheap crappy "Lifetime Warranty" parts are often out of specification, or even failed, right out of the box. Many times they have a short service life before they fail. Always buy top quality replacement parts and genuine Jeep sensors.

Numerous threads detail long and frustrating searches for a "problem" that ended up being cured with genuine Jeep repair parts.

Cheap parts are cheap for a reason.

 

[CCKen]

Ok. I'll will check all the connectors. Where exactly is the TCM located so I can inspect it.

It is just an advanced auto cps. As i said in the op I have checked the cps and am not getting any feedback from in. Unconnected with the key on I still do not get anything on the cluster. And its not shorting out I checked for continuity. I got no bus with old cps since replacing it j have not seen no bus in many many many cranks lol

I had an issue about a year ago where the jeep ran like **** due to some water in the one pcm connector. I will check all connections and throw some more dialectical grease on them again.

Some More!? Again!?

I wouldn't use Dielectric grease on the connectors. Dielectric grease is an insulator and may only agrivate existing poor pin contact conditions. Use CRC QD Electronic Cleaner to clean the connections and get rid of that grease.

The TCM is located under the dash, to the right of the steering column. You need to remove the trim cover and kick panel below the column to access the area. THe TCM is a silver box with a white connector.

 

[Spokes]

Cheap crappy "Lifetime Warranty" parts are often out of specification, or even failed, right out of the box. Many times they have a short service life before they fail. Always buy top quality replacement parts and genuine Jeep sensors.

Numerous threads detail long and frustrating searches for a "problem" that ended up being cured with genuine Jeep repair parts.

Cheap parts are cheap for a reason.

Could be. I'll will try one and see what happens.

Some More!? Again!?

I wouldn't use Dielectric grease on the connectors. Dielectric grease is an insulator and may only agrivate existing poor pin contact conditions. Use CRC QD Electronic Cleaner to clean the connections and get rid of that grease.

The TCM is located under the dash, to the right of the steering column. You need to remove the trim cover and kick panel below the column to access the area. THe TCM is a silver box with a white connector.

Will do and will check the connection. Thanks