No Scan Tool Data

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The diagnostic tables in this section are designed for use with a scan tool. If the scan tool is inoperative, this must be corrected before beginning any other diagnostic procedures. DO NOT Clear Info unless instructed by a diagnostic procedure.

IMPORTANT: This vehicle is equipped with a Powertrain Control Module (PCM) utilizing an Electrically Erasable Programmable Read Only Memory (EEPROM). When diagnostics call for replacement of the PCM, the new PCM must be programmed. Refer to PCM Replacement Programming.

TEST DESCRIPTION

Number(s) below refer to the step number(s) on the Diagnostic Table.

10. Some older scan tools are powered through a separate power cord from the cigar lighter. If this type of scan tool is being used, and the tool will not power up, check for a poor connection, or a malfunctioning lighter socket. Refer to Diagrams for circuit details. Diagrams

14. Before trying a different scan tool, check for poor connections between the DLC and the scan tool cable. A faulty Vehicle Interface Module (VIM) can also cause loss of communication.

15. If there is no communication between the PCM and the scan tool, no data will be displayed. Class 2 Serial Data is shut down when system voltage is below 9.0 Volts or above 16.0 Volts. A scan tool will not display data it system voltage is outside this range. If no data is displayed with the engine running, but data is displayed with the ignition ON, engine OFF, high system voltage (overcharging) may be at fault. If this is the case, the scan tool should display DTC P0563 System Voltage High with the ignition ON, engine OFF.

18. Before trying a different scan tool, check for poor connections between the DLC and the scan tool cable. A faulty Vehicle Interface Module (VIM) can also cause loss of communication.

Some older scan tools are powered through a separate power cord from the cigar lighter, but the VIM gets its power and ground through the DLC connector. If this type of scan tool is being used, and the tool powers up but no data is displayed, proceed to Step 10.