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 Knock sensor voltage signal, voltage should be 2.0-3.0 volts. If voltage is as specified. Problem is intermittent, check Knock sensor and ECM for proper harness connections and go to step 7
. If voltage is not as specified, go to next step.
- Start engine. Using Hi-Scan Pro/Kia Data Pro Scan tool or equivalent, monitor Knock sensor voltage signal, from idle speed to 3000 RPM. Voltage should increase. If voltage is as specified, check if other DTC is set. Do all repairs associated with other DTC before continuing this procedure and go to next step. If voltage is not as specified and no other DTC is set, go to next step.
- Turn ignition off. Thoroughly check Knock sensor. Also check for loose, bent, corroded, contaminated, deteriorated or damage Knock sensor and ECM connectors terminals. If sensor and connectors terminals are okay, go to next step. If sensor and connectors terminals are faulty, repair or replace as necessary and go to step 7
.
- Disconnect Knock sensor 2-pin harness connector. See Fig 1
. Also disconnect ECM harness connector "C". See Figure
. Measure resistance between Knock sensor connector terminal No. 2 (Brown wire) and ECM connector terminal C21. Also measure resistance between ground and Knock sensor connector terminal No. 1 (Black wire). Resistance should be below one ohm. If resistances are as specified, go to next step. If any resistance is not as specified, repair open circuits as necessary and go to step 7
.
- With Knock sensor and ECM harness connectors disconnected. Turn ignition on. Measure voltage between ground and Knock sensor connector terminal No. 2 (Brown wire). Voltage should be below 0.5 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair open or short circuit as necessary and go to step 7
.
- Turn ignition off. With Knock sensor and ECM harness connector disconnected. Measure resistance between ground and Knock sensor connector terminal No. 2 (Brown wire). Also measure resistance between Knock connector terminals No. 2 (Brown wire) and No. 1 (Black wire). Both resistances should be infinite. If resistances are as specified, temporarily install a known good Knock sensor and check for proper operation. If problem is corrected, replace Knock 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.