Test Procedure
- Turn ignition off. 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 P0102, P0103, P0121, P0122 or P0123 are set, do all repairs associated with those DTCs before continuing with this procedure. If no other DTCs are set, go to next step.
- Start engine. Using Hi-Scan Pro/Kia Data Pro Scan tool or equivalent, monitor MAF sensor voltage signals. Voltage should be 0.9-1.1 volt at idle. If voltage is as specified, problem is intermittent. Check MAF sensor and ECM for proper harness connection and go to step 12 . If voltage is not as specified, go to next step.
- Turn ignition off. Thoroughly check for loose, bent or corroded MAF sensor orECM connectors terminals. If connectors terminals are okay, go to next step. If connectors terminals are faulty, repair or replace as necessary and go to step 12 .
- Start engine. Allow engine to idle until reaches normal operating temperature. Using Hi-Scan Pro/Kia Data Pro Scan tool, monitor TP sensor voltage signal. See THROTTLE POSITION SENSOR OUTPUT VOLTAGE SPECIFICATION
table. If voltages are as specified, go to next step. If any voltage is not as specified, do all DTCs test procedures associated with TP sensor. See DTC P0121, DTC P0122 &/OR DTC P0123
. After repair go to step 12
.THROTTLE POSITION SENSOR OUTPUT VOLTAGE SPECIFICATION
Engine Speed - RPM TP Sensor Output - Voltage Idle 0.3-0.9 Throttle Fully Open 4.0-4.4 - With engine running and using Hi-Scan Pro/Kia Data Pro Scan tool or equivalent, monitor TP sensor voltage signal. Signal should increase evenly while opening throttle. If voltage is as specified, go to next step. If voltage is not as specified, temporarily install a known good TP sensor and check for proper operation. If problem is corrected, replace TP sensor and go to step 12 .
- 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 (Red/Yellow wire). Voltage should be battery voltage. If voltage is as specified, go to step 8 . If voltage is not as specified, go to next step.
- Turn ignition off. Locate fuses and Main relay in engine compartment fuse/relay box. Check Main relay operation and fuses condition. For Main relay operation test. See FUEL PUMP & MAIN RELAYS (SPECTRA) under RELAYS & SOLENOIDS in SYSTEM & COMPONENTS TESTING article. Also if necessary check Main 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 12 .
- Turn ignition off. Disconnect ECM 81-pin harness connector. See Figure . Measure resistance between MAF sensor connector terminal No. 5 (Red/White wire) and ECM connector terminal No. 37. Also measure resistance between MAF sensor connector terminal No. 4 (Blue/Green wire) and ECM connector terminal No. 33. 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 12 .
- With MAF sensor and ECM harness connectors disconnected. Turn ignition on. Measure voltage between ground and MAF sensor connector terminal No. 5 (Red/White 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 12 .
- Turn ignition off. With MAF sensor and ECM harness connectors disconnected. Measure resistance between ground and MAF sensor connector terminal No. 5 (Red/White wire). Resistance should be infinite. If resistance is as specified, go to next step. If resistance is not as specified, repair short circuit as necessary and go to step 12 .
- Check entire air intake system for blockage, leaks or damage such as:
- Air cleaner.
- Throttle body.
- Positive Crankcase Ventilation (PCV) valve.
- Intake manifold.
- Gasket between intake manifold and surge tank.
- Seals between intake manifold and fuel injectors.
- Seals between surge tank and PCV valve.
If blockage, leaks or damage are found, repair or replace as necessary and go to next step. If air intake system is okay, temporarily install a known good MAF sensor and check for proper operation. If problem is corrected, replace MAF sensor 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, fallow appropriate DTC test procedure.