Recurrent MIL ON DTC 15 (TPS Ground Circuit): Overview

90hyundai02 Subject


"CHECK ENGINE" LIGHT/CODE 15 - FIELD FIX
Group ENGINE


Number 021


Date August, 1990


Model 1990 Excel
Some 1990 Excels may experience recurrent activation of the "Check Engine" light and setting of a fault code 15 in the E.C.U.. The vehicle may exhibit stalling at idle and an inoperative air conditioning compressor when this condition occurs.

These symptoms may be related to a poor Throttle Position Sensor (T.P.S.) ground circuit in the E.C.U. wiring harness. The field fix procedure for this condition varies according to the wiring harness manufacturer, but basically involves the soldering of a crimp connection.

The connection involved is located where four black ground wires (five in California specification cars) T.P.S., I.S.C., air temperature sensor, and coolant temperature sensor, (plus exhaust gas temperature sensor for Cal. spec.) are spliced into two ground wires connecting to the ECU. (See splice SC08 on page 23-3 of the 1990 Excel Electrical Troubleshooting Manual.)