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I own a 1998 Dodge Caravan and recently when I am driving it all the gauges just stop working. Plus my Service Engine Light is on and the Code P1698 comes up. Can you help me?

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  • Dodge Master
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Hi.

P1698 means that either there is a wiring problem, or that the PCM (powertrain control module, the computer) has failed. P1698 in fact means CCD bus communication problem. The CCD bus is the main data channel used by the car computer module to communicate with other modules. The instrument cluster shutting down is a consequence of the CCD bus problem.
The repair is done checking PCM connectors, checking continuity between different point of the CCD bus wiring, and eventually replacing the PCM if there is not other fault or wiring problem.
The diagnostic trouble codes is most of the time given by a short or by a bad contact or connector, rather then by a defective module. Test carefully connectors and wiring between PCM and TCM (transmission control module).

Here the extensive troubleshooting:

P1698 NO BUS SIGNAL RECEIVED FROM PCM

CAUSES:

CCD BUS (+) OPEN

CCD BUS (-) OPEN

PCM GROUND OPEN

POWERTRAIN CONTROL MODULE

1 With Ignition On and Engine Not Running.
With the DRB try to read DTC's or Sensors in the PCM (JTEC).

Was there a no response message to PCM?

Yes Refer to symptom ENGINE STARTS AND NO RESPONSE CONDITION FROM PCM
No ® Go To 2

2 Ignition On, Engine Not Running.
With the DRB, select body, then the type of cluster you will have.
Note: Bus Test will automatically run.

Does the DRB display bus operational?

Yes ® Test Complete.
No ® Go To 3

3 Ignition On, Engine Not Running
Note: This DTC will also set if the PCM has been disconnected or the PCM programmed (Flashed).
With the DRB, Select ECM, and erase DTC s.
Cycle Ignition off, then on.
With the DRB, Select ECM, and read DTC s.

Did the DTC P1698 NO BUS MESSAGES RECEIVED FROM PCM return?

Yes ® Go To 4
No ® Test Complete.

4 Ignition Off
Disconnect the Powertrain Control Module Connectors.
Note: Check connectors - Clean/repair as necessary.
Connect a Jumper Wire between CCD Bus (+) Circuit and Ground.
Ignition On, Engine Not Running
With the DRB, select body, then the type of cluster you have.
Note: Bus test will automatically run.
Does the DRB show "short to ground"?

Yes ® Go To 5
No ® Repair open CCD Bus (+) Circuit from PCM to Data Link Connector.
Perform Powertrain Verification Test

5 Ignition Off.
Disconnect the Powertrain Control Module Connectors.
Note: Check connectors - Clean/repair as necessary.
Connect a Jumper Wire between CCD Bus (-) Circuit and Ground.
Ignition On, Engine Not Running
With the DRB, select body, then the type of cluster you have.
Note: Bus test will automatically run.
Does the DRB show short to ground?

Yes Go To 6
No Repair open CCD Bus (-) Circuit from PCM to Data Link Connector.

6 Ignition Off.
Disconnect the Powertrain Control Module Connectors.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the Ground Circuit Cavity (A31) to Ground.

Is the resistance below 10.0 ohms?

Yes Go To 7
No Repair the open Ground.

7 If there are no potential causes remaining, Replace Powertrain Control Module.

Posted on Mar 27, 2011

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