jwc1016
NAXJA Forum User
- Location
- Pennsylvania
99 Cherokee, had "no bus" msg, code P1694, checked terminals and replaced CPS, could it be the computer?
XJ No start. Getting code P1694
- Thread starter cbwymore
- Start date
Bump lol
But here's the deal. I have the same problems as before as everyone else. Jeep just cranks and won't fire. But I also have the e fan coming on once I turn the key to 'on'? I replaced the cps and still does the same thing but the e fan will surge at time. And the rear o2 sensor relay clicks? Thinking possible bad o2 sensor? Unplugged the wires and all looked good. Really stamped here. Any advice is appreciated!
But here's the deal. I have the same problems as before as everyone else. Jeep just cranks and won't fire. But I also have the e fan coming on once I turn the key to 'on'? I replaced the cps and still does the same thing but the e fan will surge at time. And the rear o2 sensor relay clicks? Thinking possible bad o2 sensor? Unplugged the wires and all looked good. Really stamped here. Any advice is appreciated!
Extinction
NAXJA Forum User
- Location
- Pennsylvania
Bump from an old post.
So here's my issue. I was welding the driver side front leaf spring mount. Checked the floor area before and found it to be under the rear seat where no carpet or padding was. Well ended up a mouse had a nest up against the ssides didn't see. It caught fire and the wired all melted coming from the front going to the back, to the passenger side from there and to the fuel pump. When the fire happened I got it out and noticed the wires there. Not knowing if they were OK in the wrap I hooked the battery back up and turned the ignition on to check the blinkers. Those and the brake lights didn't work. I then found the wires to be pretty melted once ripping rhe seat and carpet up. Spend a few hours separating and replacing each wire there one by one. All wires soldered in. Hooked the battery up thinking everything will be good. Brakes worked. Fan turned on, no guages, no blinkers, no start. What could have happened here besides all the wires which I replaced?
So here's my issue. I was welding the driver side front leaf spring mount. Checked the floor area before and found it to be under the rear seat where no carpet or padding was. Well ended up a mouse had a nest up against the ssides didn't see. It caught fire and the wired all melted coming from the front going to the back, to the passenger side from there and to the fuel pump. When the fire happened I got it out and noticed the wires there. Not knowing if they were OK in the wrap I hooked the battery back up and turned the ignition on to check the blinkers. Those and the brake lights didn't work. I then found the wires to be pretty melted once ripping rhe seat and carpet up. Spend a few hours separating and replacing each wire there one by one. All wires soldered in. Hooked the battery up thinking everything will be good. Brakes worked. Fan turned on, no guages, no blinkers, no start. What could have happened here besides all the wires which I replaced?
- Location
- Minneapolis, MN
A short circuit of 12 volts positive to ground from faulty or damaged wring may cause a P1694.
P1694 Fault In Companion Module. No CCD/J1850 bus messages received at the power train control module (PCM) from the AisinWarner Transmission Control Module (TCM). P1694 will set if no CCd bus messages are received from PCM for 20 seconds or invalid messages are received for 20 seconds.
Possible Causes
- Faulty Crankshaft Position Sensor.
- Faulty TCM.
- CCD Bus (-) circuit open between PCM and TCM.
- CCD Bus (+) circuit open between PCM and TCM.
- Transmission CCD bus wiring damaged
- CCD Bus (-) circuit open between PCM and TCM.
In the past there have been reports that the Transmission Control Module (TCM) failures and Keyless Entry (RKE) module failures have caused similar symptoms and faults. Note that the RKE module is on the CCD Bus. Try unplugging the RKE module and try unplugging the TCM and see if the NoBus message goes away and all gauges work. If so, replace the TCM or RKE. Engine sensor wire harness/wire plug issues, a faulty CPS, or a faulty TCM should be the first suspects for a P1694.
Inspect and test the CPS wire plug and wire harness for loose/bent/damaged connection pins, corrosion, and damaged wires. Inspect, clean, and tighten firmly the two ground wires at the ignition coil. They also are ground locations for the transmission computer.
P1694 Fault In Companion Module. No CCD/J1850 bus messages received at the power train control module (PCM) from the AisinWarner Transmission Control Module (TCM). P1694 will set if no CCd bus messages are received from PCM for 20 seconds or invalid messages are received for 20 seconds.
Possible Causes
- Faulty Crankshaft Position Sensor.
- Faulty TCM.
- CCD Bus (-) circuit open between PCM and TCM.
- CCD Bus (+) circuit open between PCM and TCM.
- Transmission CCD bus wiring damaged
- CCD Bus (-) circuit open between PCM and TCM.
In the past there have been reports that the Transmission Control Module (TCM) failures and Keyless Entry (RKE) module failures have caused similar symptoms and faults. Note that the RKE module is on the CCD Bus. Try unplugging the RKE module and try unplugging the TCM and see if the NoBus message goes away and all gauges work. If so, replace the TCM or RKE. Engine sensor wire harness/wire plug issues, a faulty CPS, or a faulty TCM should be the first suspects for a P1694.
Inspect and test the CPS wire plug and wire harness for loose/bent/damaged connection pins, corrosion, and damaged wires. Inspect, clean, and tighten firmly the two ground wires at the ignition coil. They also are ground locations for the transmission computer.
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