What combination of switches or knobs do I push to get a listing of any error or fault codes for a 2001 Dodge ram (5.2 L / 318 V-8 with overhead information console) ?
It cranks fine but is not starting, is displaying "no bus" in the odometer, and is showing "CCD" on the overhead display where the fuel DTE and MPG readings should be. Fuel guage reads way below empty.
It's got very low miles (about 20k) and spends most of it's time in a garage. Recently it spent a few days outside during very heavy rain.
At first I thought someone stole gas out of the tank, but it seems I'm really just having an electrical connection problem.
I want to go through the list on this page:
formatting link
But I need to get an error code first, hence my question about codes.
Ok, this worked for me (2001 Dodge Ram short cab long box):
Ignition switch off
Press and hold the trip reset knob
Turn the ignition switch to on but do not start.
Hold the reset knob for approx 10 seconds or until the word CHEC appears in the display then release.
When I saw "chec" in the odo display, I let go of the trip reset knob and the following numbers appeared one after another:
900 920 921 940 950 999
I take it that 999 is like an "end-of-code" indicator.
So I'm pretty much getting this entire laundry list:
900 The CCD data bus is not operational.
Check the CCD data bus connection at the cluster. 2. Check the cluster fuses. 3. Check the CCD data bus. 4. Check the CCD data bus voltage. 5. Check the CCD data bus terminations.
920 The cluster is not receiving a vehicle message from the PCM.
Check the PCM software level and re-flash if required. 2. Use a DRB scan tool to verify that the vehicle speed message is being sent by the PCM.
921 The cluster is not receiving a distance pulse message from the PCM.
Check the PCM software level and re-flash if required. 2. Use a DRB scan tool to verify that the distance pulse message is being sent by the PCM.
940 The cluster is not receiving an airbag message from the ACM
Check the CCD data bus connections at the ACM. 2. Check the ACM fuse.
950 The cluster is not receiving an ABS lamp-on message from the CAB.
Check the CCD data bus connections at the CAB 2. Check the CAB fuse.
The truck has been parked for a few days outside and has experienced several bouts of torrential rain. I haven't been able to start it since. It was running fine prior to being parked. Haven't had any problems with it like this since the day I bought it new (March
2001). It's got no leaks that I'm aware of.
When I turn on the ignition, all the guages move. Battery moves to 8 volts, temp moves to 55, oil pressure moves to 0, and even the fuel guage moves a little (but not to the zero or E mark).
I guess I'll have to poke around under/behind the dash, or maybe the engine compartment.
Not a truck technician but what you have is a total bus failure. there are a few things you can check. The C130 connector, the connector that is mounted at the firewall that feeds the inside. (Its a 43 pin connector) Since you say it happened when it was in the rain for awhile I would start there. Separate it and check for corrosion. There could be other reasons as well. A bad ground for the engine controller is possible. There are connectors below the dash at the Knee blocker that could effect this as well. Of course an engine controller could also be at fault.
Yes, but that's the procedure for the instrument cluster diagnostic check. While that may be helpful in diagnosing the 'CCD Bus' message, to display any engine-related OBD-II trouble codes, cycle the ignition switch OFF-ON-OFF-ON-OFF-ON, and one or more 'Pxxxx' codes will display on the odometer, culminating with 'Pdone' to indicate no more codes.
8 volts?!?! Let's first try a better battery that can provide the electronics with the proper voltage. No wonder nothing's working right. When the PCM is fed any less than 10.5 volts, strange things start to occur.
I've tried that procedure several times, but it doesn't seem to start a diagnostic reporting process. The only thing that happens when I perform an [on-off] [on-off] [on] ignition-key cycle is the same thing that happens when I just switch the ignition to on - which is the usual bell and light show from the instrument panel.
Voltage measured at the battery (with everything off) is 12.15 volts. When the ignition is switched on, battery voltage drops to 12.05 volts (DRL comes on too, which is normal). Why the guages (especially the fuel gauge) is reading below E, I have no idea.
Turn the key off-on-off-on-off-on. The display should then show any error codes present. It takes a few tries to get the timing of off-on right but it works.
M> What combination of switches or knobs do I push to get a listing of
1) key-insert / key removal position
2) radio only position (one step counter-clock-wise from 1)
3) unknown (off?) position (one step clock-wise from 1)
4) Ignition/run position (one step clock-wise from 3)
5) crank engine position (one step clock-wise from 4)
I assume that for the off-on off-on off-on sequence, that "on" is position 4 and "off" is position 3.
When I perform an off-on-off sequence, the bell rings immediately. When I perform an off-on (and stay on) sequence, the bell rings 6 times, then the odometer reading flashes 4 times and changes to "no buS", then the bell rings 4 times then a pause and then it rings 2 more times (and the low-fuel indicator comes on).
When I perform an off-on off-on off-on (and stay on) sequence, the bell rings (or starts to ring) between each step, and at the end it does what I describe above (rings 6 times, etc).
If I have the "off" and "on" positions correct, then how long is the "off" time, and how long is the "on" time ?
2001 Dodge ram short cab long box 5.2L/318 V-8 with overhead information console. Very low miles (about 20k) usually parked every night in a garage sometimes not driven for a week or two at a time. Usually not driven at all in winter. Was working fine, was parked in the driveway, stayed out during a couple of torrential storms (a few days ago) and for the past 2 days it will crank but doesn't run.
It displays "no bus" in the odometer, and is showing "CCD" on the overhead display where the fuel DTE and MPG readings should be. When the ignition is turned on, all guages show some activity. Battery moves to 8 volts, temp moves to 55, oil pressure moves to 0, and even the fuel guage moves a little (but not to the zero or E mark).
Battery volts (as measured with a meter) is showing 12.15 volts with nothing turned on, and 12.05 volts when key is turned to ignition position. DRL (daylight running lights) come on as normal when key is in ignition position. All fuses in the engine compartment and under the small cover at the drivers-side dashboard position are good. When I crank the engine, it turns over very fast, but doesn't start.
Under the hood, I discovered that the gasket/rubber weatherstripping that runs across the top of the firewall was completely off and laying across the back of the engine/air cleaner. It appears to only be a press-fit (no glue or contact cement). Therefore any rain that went between the hood and windshield could easily flow into the engine compartment. It's been dry for the past 2 days, there is no evidence of water pooling. Everything is bone dry.
I have a Haynes repair manual for Dodge Ram 1994-2001, and if the wiring diagrams are correct then the fuel guage is a simple circuit that is not dependent on a computer or the system bus - so it should be indicating something above the empty mark (which it doesn't). That manual doesn't have a good explanation of the instrument console wiring or connections. I don't think that manual is up-to-date for
2000/2001 Ram models.
I've disconnected the battery twice (each for about 15-20 minutes) and the second time I unplugged 3 large cables from the PCM and removed the PCM from the firewall. Contacts appear clean and not a hint of corrosion on either the cable ends or the PCM. I removed 4 screws holding the cover of the PCM and observed a layer of rubber (felt a little like jello) potting compound covering the circuit board. No obvious water intrusion into or under the protective layer. No components seemed dammaged.
When performing this sequence:
I get the following codes:
Where exactly is that? What do I have to take apart or unscrew to get to an access point?
Where are they?
How many wires is the CCD data bus? What colors are they? Where are their access points?
Only Dodge Ram's 94 - 97 will flash the codes according to the on-off sequence. Since mine is a 2001, I guess that explains why it's not working and I'm not seeing any codes.
I checked for 5V at the MAP and TPS and it was there in both cases. With one or the other still plugged in, I was getting 5V and no change in the over-all situation.
The Tranny speed sensor was giving me 12V (the Haynes book is saying
8?).
I guess I'll have to see if there's a cheap scan tool available, or make one:
While it's true that this function went away in '98, it came back in '00, and has existed ever since.
I suspect it's because of your CCD bus problems that you're not getting any codes. After all, the PCM communicates to the instrument cluster via the CCD bus.
Exactly.If you have a bus failure you cant communicate with certain modules. If it is a total bus failure you can communicate with any modules. Just curious but Mopar man, did you check the connection as I stated?
This probably isn't a high priority on your list but the weatherstripping can be tightened up by squeezing the weatherstrip channel with pliers. Don't crimp it closed too tight or you won't be able to get it back on.
Well, that's next. I take it that the C130 is not the connector that plugs directly into the PCM (powertrain control module) but is somewhere else in the engine compartment? I've already checked the 3 connectors that plug into the PCM, and they seem perfectly fine, as does the ground connection of the PCM.
It's the PCM that's not communicating with the instrument cluster - correct?
Are there any fuses anywere for these systems that are NOT in the engine compartment fuse module or the side-access dashboard compartment?
Put all the tools away last night around 10 pm, closed up and locked the truck for the night.
This morning (9:30 am) opened the truck, stuck the key in the ingition and turned it to ignition position. Guages all went to their normal positions - even the fuel guage went to where it should be (1/2 tank).
Ok, so I'll try the off-on off-on off-on thing with the key.
Yup, it works, I get these codes:
P0123 (Throttle Position (TP) Sensor Circuit High Voltage) P1687 (P1687 Driver 5 Line 7)
Alternate descriptions of 1687:
No Cluster BUS Message No J1850 messages received from the Mechanical Instrument Cluster (MIC) module
No MIC BUS Message No CCD/J1850 messages received from the Mechanical Instrument Cluster (MIC) module
No messages received from the Mechanical Instrument Cluster module
The 123 code I can understand - since I did disconnect the TP connector to check for 5V at the connector - but I plugged it back in so I guess the code needs to be cleared?
What exactly is the 1687 code?
I'm thinking the truck will now start, but I'd really like to know what caused this problem.
As I previously reported, the fuel guage was responding when I switched to the ignition position and I was able to get fault codes from (I guess?) the PCM.
I started the engine, and it fired right up. I re-positioned the truck in the driveway, and while it was still running the fuel guage dropped back to below empty and the "no buS" message was being shown by the odometer and the CCD message was being displayed on the overhead display. Engine was still running fine.
I shut the engine off, and started it again, and repeated that several times. Each time the engine started just fine, but the "no buS" and CCD messages are still being displayed. Strange.
"The C130 connector, the connector that is mounted at the firewall that feeds the inside. (Its a 43 pin connector)"
There is a large cable going through the firewall near the brake booster unit. It passes though the firewall via a large rubber grommet. There is no connector there.
Regarding the ECM (electronic control module) I can't locate it. According to the Haynes book, it's supposed to be "bolted to the left side of the engine block - 1999 and later models".
(Why would they do something stupid like bolting an electronic module directly to the block?)
The diagram shows a module with 2 bundles of cables coming from it. The module seems to be attached to a large plate, and the plate is bolted to the block. A fuel transfer pump is shown - it could be near or in front of the ECM. I can find no such module or large plate anywhere on the block (I looked under the engine too). What is the left side? Is that the driver's side?
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