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Home >> Kia >> 2021 >> Sorento EX, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Double Clutch Transmission System Diagnosis - 2.5T (VIN F) (3 Of 3) (Except HEV) >> DTC U0121-87: Lost Communication With Anti-Lock Brake System (ABS) Control Module >> Wiring Inspection >> Circuit Inspection

Circuit Inspection

G13690122Courtesy of KIA MOTORS AMERICA, INC.
Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
  1. Ignition "ON".
TCU 20 (P-CAN high) Chassis ground - Fig.1
TCU 19 (P-CAN low) Chassis ground -
  1. Ignition "OFF".
  2. Refit all connectors of each control module (refer to circuit) of P-CAN communication.
TCU 20 (P-CAN high) TCU 19 (P-CAN low) Approx. 60Ω
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
ECM (component side) 83 (P-CAN high) ECM (component side) 82 (P-CAN low) Approx. 120Ω
ICU (component side) 17 (P-CAN high) ICU (component side) 18 (P-CAN low) Approx. 120Ω
G13690123Courtesy 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".
VDC (with EPB) 1, 30 (Memory power) Chassis ground - B+
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
VDC (with EPB) 14, 46 (ground) Chassis ground - Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
TCU 20 (P-CAN high) VDC (with EPB) 23 (P-CAN high) Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
TCU 19 (P-CAN low) VDC (with EPB) 22 (P-CAN low) Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
VDC (W/O EPB) 1, 25 (Memory power) Chassis ground - B+
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
VDC (W/O EPB) 13, 38 (ground) Chassis ground - Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
TCU 20 (P-CAN high) VDC (W/O EPB) 8 (P-CAN high) Approx. below 1Ω
  1. Ignition "OFF".
  2. Disconnect the electrical connector(s) from the concerned component.
  3. Ignition "ON".
TCU 19 (P-CAN low) VDC (W/O EPB) 7 (P-CAN low) Approx. below 1Ω

Good 

No Good