Signal Circuit Inspection

Check CAN BUS Short to Ground.
1. Key "OFF".
2. Disconnect ECM/PCM connector.
3. Measure the resistance between terminal 12 of ECM/PCM harness connector and chassis ground. [A/T]
  Measure the resistance between terminal 84 of ECM/PCM harness connector and chassis ground. [M/T]
4. Measure the resistance between terminal 27 of ECM/PCM harness connector and chassis ground. [A/T]
  Measure the resistance between terminal 62 of ECM/PCM harness connector and chassis ground. [M/T]
  
  Specification: Infinite
  
  Fig 1: Measuring Resistance Between Terminal 12 And 27 Of ECM/PCM Harness Connector And Chassis Ground (A/T)
  Courtesy of KIA MOTORS AMERICA, INC.
  
  Fig 2: Measuring Resistance Between Terminal 84 And 62 Of ECM/PCM Connector And Ground (M/T)
  Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured resistance within specification?
  YES
  - Go to step 2.
  NO
  - Repair Short in signal circuit and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
CAN BUS Terminus Resistance Check (Harness side)
1. Key "OFF".
2. Disconnect ECM/PCM connector.
3. Measure the resistance between terminal 12 and 27 of ECM/PCM harness connector. [A/T]
  Measure the resistance between terminal 84 and 62 of ECM/PCM harness connector. [M/T]
  
  Specification: 120 ± 10Ω
  
  Fig 3: Measuring Resistance Between Terminal 12 And 27 Of ECM/PCM Connector And Ground (A/T)
  Courtesy of KIA MOTORS AMERICA, INC.
  
  Fig 4: Measuring Resistance Between Terminal 84 And 62 Of ECM/PCM Connector And Ground (M/T)
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured resistance within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - In case the measured resistance is around 1.0Ω: Repair Short in signal circuit and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  - In case the measured resistance is Infinite: Repair Open in signal circuit and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.