Signal Circuit Inspection

Checking the circuit of MAP signal line is to find whether there is open or short circuit in MAP harness.

1. Check for open in harness
   1. Ignition "OFF"
   2. Disconnect MAP sensor connector.
   3. Ignition "ON" & Engine "OFF"
   4. Measure voltage between terminal 1 of sensor harness connector and chassis ground.

      Specification: approximately 5V

      Fig 1: Measuring Voltage Between Terminal 1 Of Sensor Harness Connector And Chassis Ground

      Courtesy of HYUNDAI MOTOR CO.
   5. Is measure voltage within Specification?

      YES 

      • Go to "Check for short to power in harness" below.

      NO 

      • Open circuit or short circuit to chassis ground between MAP harness connector and signal circuit.
      • Open circuit between MAP harness connector and ECM harness connector.
      • Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure
        NOTE:

        1. In case, when MAP connector is disconnected, the voltage of MAP terminal 1 is 0 V.
           • Possible cause: Open or short between terminal 16 of PCM and Terminal 1 of MAP
2. Check for short to power in harness
   1. Ignition "OFF"
   2. Disconnect MAP sensor connector and ECM connector.
   3. Ignition "ON" & Engine "OFF"
   4. Measure resistance between terminal 1 and 2 of sensor harness connector.

      Specification: infinite

      Fig 2: Measuring Resistance Between Terminal 1 And 2 Of Sensor Harness Connector

      Courtesy of HYUNDAI MOTOR CO.
   5. Is measure resistance within Specification?

      YES 

      • Go to "GROUND CIRCUIT INSPECTION " procedure.

      NO 

      • Short circuit between reference voltage (5V) circuit and signal circuit.
      • Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure
        NOTE: When the terminal land 2 of MAP is shorted, the resistance is below 1 ohm.