FixVault
Home › Kia › 2001 › Rio Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics - RIO › Diagnostic Tests › DTC P1640: Main Relay Malfunction › Procedure

DTC P1640: Main Relay Malfunction: Procedure

NOTE: Diagnostic procedure not given by manufacturer.
  1. Voltage is lower than 6 volts when ignition is turned on. go to next step. Voltage is higher than 6 volts when ignition is turned on. go to next step.
  2. Check charging system and wiring harness between main relay and ECM. See DTC P0562: SYSTEM VOLTAGE LOW DTC P0563: SYSTEM VOLTAGE HIGH  . See WIRING DIAGRAMS article. Check for loose, damaged or corroded terminals. Repair as necessary.
About FixVault