Servicing the Kyung Shin Wiring Harness
Figure 4. Identification of wiring harness connectors.:
Servicing the Kyung Shin Wiring Harness
1. Disconnect the negative (-) battery cable.
2. Referring to Figure 4, disconnect the following ECU wiring harness connectors and ground wires located underneath the driver's side of the dash-board: Connectors C50-1, C50-2, C50-3; Ground Wire G08; and Connectors MC01, MC02.
3. Referring to Figure 4, disconnect the following ECU connectors located in the engine compartment: C18 (A/C pressure switch); C20 (A/C compressor bullet); C21 (distributor); C39 (purge control solenoid valve); C41 (EGR control solenoid valve) (California specs. only); C40 (pre-excitation resistor); and G07 (ground wire attached to bulkhead).
Figure 5. Removal of wiring loom cover.:
Remove the three bolts attaching the square shaped ECU wiring loom cover. The cover is attached to the surge tank in the engine compartment. Refer to Figure 5.
Remove the tie strap holding the EGR/ purge control solenoid valve wiring (connectors C39, C40 and C41) to the accelerator cable.
Figure 6. Location of TPS crimp connection.:
4. Remove the rubber ECU wiring harness grommet from the bulkhead and carefully pull the passenger compartment side of the harness into the engine compartment through the bulkhead. The entire harness should now be in the engine compartment.
The Throttle Position Sensor (TPS) crimp connection splice is located about eight inches from the bulkhead grommet on the interior side of the ECU wiring harness. Refer to Figure 6.
Figure 7. Exposing the crimp connection.:
5. Remove the electrical tape covering the harness to expose the TPS crimp connection splice. Also remove any tape or shrink wrap tubing found on the splice. See Figure 7.
6. Examine the wires leading into each side of the crimp connection. If any wire strands are broken, remove the crimp connection and install a new one. Use a 12-guage, non-plastic crimp for the new connection.
7. Solder the crimp connection according to the instructions on Page 2 of this bulletin.
8. Tape the exposed crimp connection splice with electrical tape and re-wrap the wiring harness with the original cover.
Carefully feed the wiring harness back through the bulkhead and reinstall the rubber grommet. Install the square shaped ECU wiring loom cover. Reconnect all ground wires and connectors detached in Steps 2 and 3.
Replace all tie straps that were removed. Reconnect the negative (-) battery cable.
IMPORTANT: Be sure all wiring is clear from moving parts and hot surfaces.
9. Use the Multi-Use Tester (MUT) to verify that idle speed and TPS voltages are within specification. If necessary, adjust idle speed and TPS voltages according to the 1990 Precis Service Manual, Pages 31-16/31-18, or the 1991 Precis Service Manual, Pages 31-20/31-22.