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Home >> Chrysler >> 2003 >> Intrepid SE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1698: No Transmission Bus Message >> Test
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DTC P1698: No Transmission Bus Message: Test

NOTE: If DTC P1603 or DTC P1604 are set along with this DTC, diagnose them first before continuing with DTC P1698, seeDTC P1603: PCM INTERNAL DUAL-PORT RAM COMMUNICATION or DTC P1604: PCM INTERNAL DUAL-PORT RAM READ/WRITE INTEGRITY FAILURE . Before continuing, inspect all fuses and ensure that all power and ground circuits are operating properly. Check all powers and grounds to the PCM before continuing.
  1. Turn the ignition on. With the DRBIII® scan tool, erase DTCs. Start the engine, allow the engine to run for at least 20 seconds with the gear selector in Drive. Repeat at least 2 times. With the DRBIII® scan tool, read DTCs. Does the DTC reset? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
    2. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  2. Turn the ignition off. Disconnect the PCM harness connectors. Turn the ignition to run. Using a 12-volt test light connected to ground, probe the (F12) fused ignition switch output (Off-Run-Start) cavity C1-12 circuit at the appropriate terminal of the Miller Special Tool (8815). If the test light illuminates, wiggle the wiring harness to ensure that the problem is not an intermittent wiring problem. Does the test light illuminate brightly? If yes, go to next step. If no, check all related fuses. Repair the (F12) fused ignition switch output circuit for an open.
    3. NOTE: Determine which modules this vehicle is equipped with before beginning. When attempting to communicate with any of the modules on this vehicle, the DRBIII® scan tool will display 1 of 2 different communication errors, a NO RESPONSE message or a BUS +/- SIGNALS OPEN message.
  3. Turn the ignition on. Using the DRBIII® scan tool, attempt to communicate with the following control modules; Body Control Module (BCM), Instrument Cluster (MIC), Controller Anti-lock Brake (CAB). Was the DRBIII® scan tool able to communicate with one or more Module(s)? If yes, replace and program the PCM. See PROGRAMMING . If no, refer to the appropriate test under COMMUNICATIONS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
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