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 FOR SHORT TO POWER IN HARNESS
1. Disconnect the ECM and MAFS connectors.
2. Turn ignition switch to ON position.
3. Measure voltage between terminal 3 of the MAFS harness connector and chassis ground.
Fig 1: Measuring Voltage Between Terminal 3 Of MAFS Harness Connector & Chassis Ground
Courtesy of HYUNDAI MOTOR CO.
- Specification: below 0.5V
Is voltage within specification?

Yes: Go to next

No: Repair short to power in harness.
CHECK MAFS SIGNAL
1. Reconnect 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 SPECIFICATION for more information.
Is signal within specification?

Yes: Proceed with ECM PROBLEM PROCEDURE .

No: Replace MAFS.