Test Procedure
- Turn ignition off. Visually Inspect front HO2S circuit for exposed wiring, contamination, corrosion and proper installation. If no problem is found, go to next step. If problem is found, repair or replace as necessary and go to step 7
.
- Connect Hi-Scan Pro/Kia Data Pro Scan tool or equivalent to OBD-II Data Link Connector. See Figure
. Turn ignition on. Monitor for other DTCs. If DTCs related to front HO2S heater circuit are set, go to next step. If no other DTCs are set. Problem is intermittent, check HO2S and ECM for proper harness connections and go to step 7
.
- Turn ignition off. Disconnect frontHO2S 4-pin harness connector. See Fig 2
. Start engine. Allow engine to idle until ECT sensor reaches normal operating temperature. Measure voltage between ground and front HO2S connector terminal No. 1 (Pink wire). Voltage should be battery voltage. If voltage is as specified, go to step 5
. If voltage is not as specified, go to next step.
- Turn ignition off. Locate fuses, Main and Fuel Pump relays in engine compartment fuse/relay box. Check Main and Fuel Pump relay operation and fuses condition. For relays operation test. See FUEL PUMP & MAIN RELAYS (SPECTRA)
under RELAYS & SOLENOIDS in SYSTEM & COMPONENTS TESTING article. Also if necessary check Main and Fuel Pump relay circuits. See ENGINE PERFORMANCE under SPECTRA in WIRING DIAGRAMS article. If fuses, relay and circuits are okay, go to next step. If fuses, relay or circuits are faulty, repair or replace as necessary, and go to step 7
.
- Disconnect ECM 81-pin harness connector. See Figure
. Measure resistance between HO2S connector terminal No. 3 (Green/Black wire) and ECM connector terminal No. 1. Resistance should be below one ohm. If resistance is as specified, go to next step. If resistance is not as specified, repair open circuit as necessary and go to step 7
.
- With front HO2S harness connector disconnected. Measure resistance between HO2S connector terminal No. 1 and 3 (component side). Resistance should be 2-4 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, temporarily install a known good HO2S and check for proper operation. If problem is corrected, replace front HO2S and go to next step.
- After repair, return vehicle to original condition. Clear codes using Hi-Scan Pro/Kia Data Pro Scan tool or equivalent. Verify repairs by driving vehicle and monitoring for pending codes. If DTC is set during test drive, follow appropriate DTC test procedure.
Courtesy of KIA MOTORS AMERICA, INC.
Courtesy of KIA MOTORS AMERICA, INC.