Test Procedure
- Turn ignition off. Connect Hi-Scan Pro/Kia Data Pro Scan tool or equivalent to OBD-II Data Link Connector. See Figure
. Start engine. Monitor MAF sensor voltage signals. Voltage should be 0.5 volt at idle. If voltage is as specified, problem is intermittent. Check MAF sensor for leaves and other debris. Check MAF sensor and ECM for proper harness connection and go to step 7
. If voltage is not as specified, go to next step.
- Turn ignition off. Disconnect MAF sensor 5-pin harness connector. See Fig 1
. Turn ignition on. Measure voltage between ground and MAF sensor connector terminal No. 2 (Green wire). Voltage should be battery voltage. If voltage is as specified, go to step 4
. If voltage is not as specified, go to next step.
- Turn ignition off. Locate fuses and Main relay in engine compartment fuse/relay box. See Figure
. Check Main relay operation and fuses condition. For Main relay operation test. See MAIN RELAY (SEDONA & SORENTO)
under RELAYS & SOLENOIDS in SYSTEM & COMPONENTS TESTING article. Also if necessary check Main relay circuits. See ENGINE PERFORMANCE under SORENTO 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 11
.
- Turn ignition off. Disconnect ECM harness connector "B". See Figure
. Measure resistance between MAF sensor connector terminal No. 5 (Yellow wire) and ECM connector terminal B11. Also measure resistance between MAF sensor connector terminal No. 3 (Brown wire) and ECM connector terminal B9. Both resistances should be below one ohm. If resistances are as specified, go to next step. If any resistance is not as specified, repair open or short circuit as necessary and go to step 7
.
- With MAF sensor and ECM harness connectors disconnected. Turn ignition on. Measure voltage between ground and MAF sensor connector terminal No. 5 (Yellow wire). Voltage should be below 0.5 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair short circuit as necessary and go to step 7
.
- Turn ignition off. With MAF sensor and ECM harness connectors disconnected. Measure resistance between ground and MAF sensor connector terminal No. 5 (Yellow wire). Also measure resistance between MAF sensor connector terminalNo. 5 (Yellow wire) and No. 3 (Brown wire). Both resistances should be infinite. If resistances are as specified, temporarily install a known good MAF sensor and check for proper operation. If problem is corrected, replace MAF sensor. If problem persists replace ECM and go to next step. If any resistance is not as specified, repair short circuit as necessary 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.