Test Procedure
- Turn ignition off. Thoroughly check CKP sensor. Also Check for loose, bent, corroded, contaminated, deteriorated or damage CKP sensor and ECM harness connectors terminals. If sensor and harness connectors terminals are okay, go to next step. If sensor and harness connectors are faulty, repair or replace as necessary and go to step 7.
- Disconnect CKP sensor 3-pin harness connector. See Fig 1. Turn ignition on. Measure voltage between ground and CKP sensor connector terminal No. 3 (Pink 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. Check EGR fuse (15 amp), located in engine compartment fuse/relay box. Check Main relay operation. See FUEL PUMP & MAIN RELAYS (OPTIMA & MAGENTIS (CANADIAN) 2.7L)
under RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING article. Also, if necessary, check Main relay circuits. See OPTIMA & MAGENTIS (CANADIAN)
in WIRING DIAGRAMS article. If EGR fuse, Main relay and Main relay circuits are okay, go to next step. If EGR fuse, Main relay or Main relay circuits are faulty, repair or replace as necessary, and go to step 7.
- Disconnect ECM harness connector "M". See Figure. Measure resistance between CKP sensor connector terminal No. 2 (Yellow wire) and ECM connector terminal M8. Also measure resistance between CKP sensor connector terminal No. 1 (Black/White wire) and ECM connector terminal M21. 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 circuit as necessary and go to step 7.
- With CKP sensor and ECM harness connectors disconnected. Turn ignition on. Measure voltage between ground and CKP connector terminal No. 2 (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 go to step 7.
- Turn ignition off. With CKP sensor and ECM harness connectors disconnected. Measure resistance between ground and CKP sensor connector terminal No. 2 (Yellow wire). Also measure resistance between CKP connector terminals No. 1 (Black/White wire) and No. 2 (Yellow wire). Measure resistance between terminals No. 1 (Black/White wire) and No. 3 (Pink wire). Measure resistance between terminals No. 2 (Yellow wire) and No. 3 (Pink wire). All resistances should be infinite. If resistances are as specified, temporarily install a Known-good CKP sensor and check for proper operation. If problem is corrected, replace CKP sensor 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.