Inspection Procedures

PROBLEM VERIFICATION
1. Connect a Hi-Scan (Pro) to the data link connector.
2. Start the engine and monitor the MAFS signals.
- Refer to SPECIFICATIONS for more information.
  Is signal within specification?
No: Go to next

Yes: Problem is intermittent or was repaired and engine control module memory was not cleared. Proceed with INTERMITTENT PROBLEM PROCEDURE .
CHECK MAFS AND ECM CONNECTORS
1. Check the MAFS and ECM for poor connection, misplaced, bent, loose or corroded terminals.
Are both connectors good?

Yes: Go to next

No: Repair or replace it.
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.
Fig 1: Measuring Voltage Between Terminal 2 Of MAFS Harness Connector & Chassis Ground
Courtesy of HYUNDAI MOTOR CO.
- Specification: approximately B+
  Is voltage within specification?
Yes: Go to next

No: Repair open or short to chassis ground in harness.
CHECK FOR OPEN IN HARNESS
1. Turn ignition switch to OFF position and disconnect 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.
Fig 2: Measuring Resistance Between Terminal Of MAFS Harness Connector & Of ECM Harness Connector
Courtesy of HYUNDAI MOTOR CO.
- Specification: below 1ohm
  Does resistance indicate continuity?
Yes: Go to next

No: Repair open in harness.
CHECK FOR SHORT TO GROUND IN HARNESS
1. Measure resistance between terminal 3 of the MAFS harness connector and chassis ground.
2. Measure resistance between terminals 3 and 4 of the MAFS harness connector.
Fig 3: Measuring Resistance Between Terminals 3 & 4 Of MAFS Harness Connector
Courtesy of HYUNDAI MOTOR CO.
- Specification: infinite
  Does each resistance indicate open?
Yes: Go to next

No: Repair short to chassis ground in harness.
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.
- Refer to SPECIFICATIONS for more information.
  Is signal within specification?
Yes: Proceed with ECM PROBLEM PROCEDURE .

No: Replace MAFS.