Inspection Procedure

PROBLEM VERIFICATION

1. Connect a Hi-Scan (Pro) to the data link connector.
2. Start the engine and monitor the MAFS signals.
   1. Specification (MAFS signal voltage):

      0.6 ~ 1.0 V at idle

      1.7 ~ 2.0 V at 3000 rpm

   Is signal within specification?

   1. No:  Go to next step.
   2. Yes: Problem is intermittent or was repaired and ECM memory was not cleared. See INTERMITTENT PROBLEM INSPECTION PROCEDURE ..
3. CHECK MAFS AND ECM CONNECTORS

   Check the MAFS and ECM for poor connection, misplaced, bent, loose or corroded terminals. See CONNECTOR INSPECTION PROCEDURE .

   Are both connectors good?

   1. Yes:  Go to next step.
   2. No: Repair or replace it.
4. CHECK POWER TO MAFS
   1. Turn ignition switch to OFF position and disconnect MAFS connector.
   2. Turn ignition switch to ON position.
   3. Measure voltage between terminal 2 of the MAFS harness connector and chassis ground.

      Specification: approximately B+

      Fig 1: Checking Power To MAFS

      Courtesy of KIA MOTORS AMERICA, INC.

   Is voltage within specification?

   1. Yes:  Go to next step.
   2. No: Repair open or short to chassis ground in harness.
5. CHECK FOR OPEN IN HARNESS
   1. Turn ignition switch to OFF position, and then disconnect MAFS and ECM connector.
   2. Measure resistance between terminal 3 of the MAFS harness connector and 60 of the ECM harness connector.
   3. Measure resistance between terminal of the MAFS harness connector and 48 of the ECM harness connector.

      Specification (Resistance): below 1Ω

      Fig 2: Checking For Open In Harness

      Courtesy of KIA MOTORS AMERICA, INC.

   Does resistance indicate continuity?

   1. Yes:  Go to next step.
   2. No: Repair open in harness.
6. CHECK FOR SHORT TO GROUND IN HARNESS
   1. Turn ignition switch to OFF position, and then disconnect MAFS and ECM connector.
   2. Measure resistance between terminal 3 of the MAFS harness connector and chassis ground.
   3. Measure resistance between terminals 3 and 4 of the MAFS harness connector.

      Specification (Resistance) : infinite

      Fig 3: Checking For Short To Ground In Harness

      Courtesy of KIA MOTORS AMERICA, INC.

   Does the resistance indicate open?

   1. Yes:  Go to next step.
   2. No: Repair short or short to chassis ground in harness.
7. CHECK MAFS SIGNAL
   1. Connect the ECM and MAFS connectors.
   2. Connect a Hi-Scan (Pro) to the data link connector.
   3. Start the engine and monitor the MAFS signals.

      Specification (MAFS signal voltage): 0.6 ~ 1.0 V at idle 1.7 ~ 2.0 V at 3000 rpm

   Is signal within specification?

   1. Yes:  Proceed with ECM PROBLEM INSPECTION PROCEDURE .
   2. No: Replace MAFS.