Engine Control System: Diagnosis — Kia Rio III (2011-2015)

ECM Problem Inspection Procedure

TEST ECM GROUND CIRCUIT: Measure resistance between ECM and chassis ground using the backside of ECM harness connector as ECM side check point. If the problem is found, repair it. Specification: Below 1ohms
TEST ECM CONNECTOR: Disconnect the ECM connector and visually check the ground terminals on ECM side and harness side for bent pins or poor contact pressure. If the problem is found, repair it.
If problem is not found in Step 1 and 2, the ECM could be faulty. If so, make sure there were no DTC's before swapping the ECM with a new one, and then check the vehicle again. If DTC's were found, examine this first before swapping ECM.
RE-TEST THE ORIGINAL ECM: Install the original ECM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original ECM with a new one. If problem does not occur, this is intermittent problem (Refer to «BASIC INSPECTION PROCEDURE»(ref-536092-S01086643492013031400000) .

Connect the GDS on the Data Link Connector (DLC).
Measure the output voltage of the MAPS at idle and IG ON. Specification: Refer to " «Specification»(ref-536093-S42345146742013031400000) "

Turn the ignition switch OFF.
Disconnect the IATS connector.
Measure resistance between the IATS terminals 3 and 4.
Check that the resistance is within the specification. Specification: Refer to " «Specification»(ref-536093-S00358025592013031400000) "

Turn the ignition switch OFF.
Remove the ECTS (Refer to " «Removal»(ref-536093-S39992025572013031400000) ").
After immersing the thermistor of the sensor into engine coolant, measure resistance between the ECTS terminals 3 and 4.
Check that the resistance is within the specification. Specification: Refer to " «Specification»(ref-536093-S39888307332013031400000) "

Scheme 96: Removal

Turn the ignition switch OFF and disconnect the battery negative (-) cable.
Disconnect the engine coolant temperature sensor connector (A).
Supplement the engine coolant (Refer to " «COOLING SYSTEM»(ref-536074) " in EM group).

Check signal waveform of CKPS and CMPS using a GDS. Specification: Refer to " «Waveform»(ref-536093-S41509859172013031400000) "

Check the signal waveform of the CMPS and CKPS using the GDS. Specification: Refer to " «Wave Form»(ref-536093-S35366327062013031400000) "

Turn the ignition switch OFF.
Disconnect the HO2S connector.
Measure resistance between the HO2S terminals 4 and 5 [B1/S1].
Measure resistance between the HO2S terminals 3 and 4 [B1/S2].
Check that the resistance is within the specification. Specification: Refer to " «Specification»(ref-536093-S24658703492013031400000) "

Connect the GDS on the Data Link Connector (DLC).
Turn the ignition switch ON.
Measure the output voltage of the APS 1 and 2 at C.T and W.O.T. Specification: Refer to " «Specification»(ref-536093-S03796696862013031400000) "

Connect the GDS on the Data Link Connector (DLC).
Measure the output voltage of the FTPS. Specification: Refer to " «Specification»(ref-536093-S11358262672013031400000) "

Scheme 97: Removal

Turn the ignition switch OFF and disconnect the battery negative (-) cable.
Remove the rear seat (Refer to «REAR SEAT»(ref-536123-S09518006422013031400000) .
Remove the fuel pump service cover (A).
Disconnect the fuel tank pressure sensor connector.
Remove the fuel tank pressure sensor (A) after releasing the hooks vertically.

Turn the ignition switch OFF.
Disconnect the injector connector.
Measure resistance between the injector terminals 1 and 2.
Check that the resistance is within the specification. Specification: Refer to " «Specification»(ref-536093-S20457695542013031400000) "

Turn the ignition switch OFF.
Disconnect the PCSV connector.
Measure resistance between the PCSV terminals 1 and 2.
Check that the resistance is within the specification. Specification: Refer to " «Specification»(ref-536093-S14632488942013031400000) "

Turn the ignition switch OFF.
Disconnect the OCV connector.
Measure resistance between the OCV terminals 1 and 2.
Check that the resistance is within the specification. Specification: Refer to " «Specification»(ref-536093-S06305361902013031400000) "

Turn the ignition switch OFF.
Disconnect the VIS valve connector.
Measure resistance between VIS valve terminals 1 and 2. Specification: Refer to " «Specification»(ref-536093-S33071032622013031400000) "

Turn the ignition switch OFF and disconnect the battery negative (-) cable.
Disconnect the fuel pressure regulator valve connector.
Measure resistance between the fuel pressure regulator valve terminals 1 and 2.
Check that the resistance is within the specification. Specification: Refer to " «Specification»(ref-536093-S28901738092013031400000) "

Turn the ignition switch OFF.
Disconnect the CCV connector.
Measure resistance between the CCV terminal 1 and 2.
Check that the resistance is within the specification. Specification: Refer to " «Specification»(ref-536093-S28410703682013031400000) "
Disconnect the vapor hose connected with the canister from the CCV.
Connect a vacuum pump to the nipple.
Ground the CCV control line and apply battery voltage to the CCV power supply line.
Apply vacuum and check the valve operation. Specification: Vacuum maintained

Scheme 99: Removal

Turn the ignition switch OFF and disconnect the battery negative (-) cable.
Lift the vehicle.
Disconnect the canister close valve connector (A).
Disconnect the ventilation hose (B) from the fuel tank air filter and canister close valve.
Remove the fuel tank air filter assembly after removing a bolt (A).
Remove the bracket (A) after pulling it.
Release the lever (A) by lifting it up.
Remove the canister close valve (B) from the fuel tank air filter (C) after rotating it in the direction of the arrow in the illustration.