Pcm Problem Inspection Procedure

1. TEST PCM GROUND CIRCUIT: Measure resistance between PCM and chassis ground using the backside of PCM harness connector as PCM side check point. If the problem is found, repair it.

   Specification (Resistance): 1Ω or less

2. TEST PCM CONNECTOR: Disconnect the PCM connector and visually check the ground terminals on PCM side and harness side for bent pins or poor contact pressure. If the problem is found, repair it.
3. If problem is not found in Step  1 and  2, the PCM could be faulty. If so, replace the PCM with a new one, and then check the vehicle again. If the vehicle operates normally then the problem was likely with the PCM.
4. RE-TEST THE ORIGINAL PCM: Install the original PCM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original PCM with a new one. If problem does not occur, this is intermittent problem (Refer to INTERMITTENT PROBLEM INSPECTION PROCEDURE in BASIC INSPECTION PROCEDURE).

VIN PROGRAMMING PROCEDURE 

VIN (Vehicle Identification Number) is a number that has the vehicle's information (Maker, Vehicle Type, Vehicle Line/Series, Body Type, Engine Type, Transmission Type, Model Year, Plant Location and so forth. For more information, please refer to the GENERAL INFORMATION article ). When replacing a PCM, the VIN must be programmed in the PCM. If there is no VIN in PCM memory, the fault code (DTC P0630) is set.

1. Select "Vehicle" and "Engine" (For example, TUCSON 2.0L L4).
   Fig 1: Screen Display - VEHICLE And ENGINE

   Courtesy of HYUNDAI MOTOR CO.
2. Select "VIN WRITING".
   Fig 2: Screen Display - VIN Writing

   Courtesy of HYUNDAI MOTOR CO.
3. Check the PCM status.
   Fig 3: Screen Display - PCM Status

   Courtesy of HYUNDAI MOTOR CO.
   NOTE:

   • VIRGIN: VIN is not programmed
   • LEARNT: VIN has been already programmed

   Is the PCM status "VIRGIN"?

   YES 

   • Go to next step 4.

   NO 

   • END
4. Write the VIN with cursor, function and number keys.
   WARNING: Before pressing the "ENTER" key, confirm the VIN again because the programmed VIN cannot be changed.
   Fig 4: Screen Display - VIN Write

   Courtesy of HYUNDAI MOTOR CO.
5. After verifying the written VIN, press the "ENTER" key.
6. Turn the ignition switch OFF, and then turn ON.
   Fig 5: Screen Display - VIN Write

   Courtesy of HYUNDAI MOTOR CO.
7. Verify the programmed VIN in the PCM memory.