System Diagnosis: Notes

Use Chrysler Motors code charts when using Chrysler's Diagnostic Readout Box (DRB-II). If DRB-II is not available, system diagnosis can be accomplished using a voltmeter. To perform self-diagnostics using a voltmeter, see RETRIEVING CODES (USING VOLTMETER) .

NOTE: Chrysler Motors recommends using DRB-II to diagnose system. Voltmeter usage has limited diagnostic capabilities, but can be used if DRB-II is not available.

Engine Control Unit (ECU) monitors several different engine control system circuits. If an abnormal input signal occurs, a fault code is stored in ECU memory and given a fault code number. Each circuit has its own fault number and message. A fault code does not condemn any specific component; it simply points out a probable malfunctioning area.

Fault codes can be confirmed by using a voltmeter or Chrysler's Diagnostic Readout Box (DRB-II). See RETRIEVING CODES (USING VOLTMETER) or RETRIEVING CODES (USING DRB-II) . By using DRB-II, self-diagnostic capabilities of this system can simplify testing and reduce diagnostic time.

System malfunctions encountered are identified as either hard failures or intermittent failures as determined by ECU.