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Home >> Kia >> 2020 >> Optima LX >> Repair and Diagnosis >> External Pages >> Different car >> Section 418 (Double Clutch Transmission Diagnosis - 1.6L (4 Of 4)) >> DTC U0121-87: Lost Communication With Anti-Lock Brake System (ABS) Control Module >> Wiring Inspection >> Circuit Inspection

Circuit Inspection

WARNING: This page is about a different car, the 2022 Kia Seltos. However, it is still accessible from the selected car via links, so may be relevant.
G13506069Courtesy of KIA MOTORS AMERICA, INC.
G13506070Courtesy of KIA MOTORS AMERICA, INC.
Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
  1. Ignition "ON".
 TCM connector 18 (P-CAN high) Chassis ground - Fig.1
TCM connector 17 (P-CAN low) Chassis ground -
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
 TCM connector 18 (P-CAN high) TCM connector 17 (P-CAN low) Approx. 60Ω
  1. Ignition "OFF".
  2. Disconnect battery (-) cable.
  3. Disconnect the electrical connector(s) from the concerned component.
 ECM (component side) 85 (P-CAN high) ECM (component side) 63 (P-CAN low) Approx. 120Ω
ICU (component side) 9 (P-CAN high) ICU (component side) 8 (P-CAN low) Approx. 120Ω
G13506071Courtesy of KIA MOTORS AMERICA, INC.

Good 

No Good 

Module Circuit Inspection
Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
 ABS/ESP connector (E/O EPB) 1, 25 (memory power) Chassis ground - Approx. 12V
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
 ABS/ESP connector (E/O EPB) 32 (ON/START Input) Chassis ground - Approx. 12V
  1. Ignition "OFF".
  2. Disconnect battery (-) cable.
  3. Disconnect the electrical connector(s) from the concerned component.
 ABS/ESP connector (E/O EPB) 13, 38 (ground) Chassis ground - Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect battery (-) cable.
  3. Disconnect the electrical connector(s) from the concerned component.
 TCM connector 18 (P-CAN high) ABS/ESP connector (E/O EPB) 8 (P-CAN high) Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect battery (-) cable.
  3. Disconnect the electrical connector(s) from the concerned component.
 TCM connector 17 (P-CAN low) ABS/ESP connector (E/O EPB) 7 (P-CAN low) Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
 ESP connector (With EPB) 1, 30 (memory power) Chassis ground - Approx. 12V
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
 ESP connector (With EPB) 37 (ON/START Input) Chassis ground - Approx. 12V
  1. Ignition "OFF".
  2. Disconnect battery (-) cable.
  3. Disconnect the electrical connector(s) from the concerned component.
 ESP connector (With EPB) 14, 46 (ground) Chassis ground - Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect battery (-) cable.
  3. Disconnect the electrical connector(s) from the concerned component.
 TCM connector 18 (P-CAN high) ESP connector (With EPB) 23 (P-CAN high) Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect battery (-) cable.
  3. Disconnect the electrical connector(s) from the concerned component.
 TCM connector 17 (P-CAN low) ESP connector (With EPB) 22 (P-CAN low) Approx. below 1Ω

Good 

No Good 

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