LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2025 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (HEV) - Diagnostic Codes (5 Of 5), Symptom Tests & Circuit Tests >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (except Gasoline Model) >> DTC U0100-00: Lost Communication with ECM/PCM "A"; DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-00: Lost Communication with TCM; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0114-87: Lost Communication with Four-wheel Drive Clutch Control Module Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module "A" Missing Message; DTC U0131-87: Lost Communication With Power Steering Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U025E-87: Lost Communication with Electronic Brake Booster Control Module "A" Missing Message; DTC U1106-00: Lost Communication with Electric Parking Brake Module; DTC U1107-87: Lost Communication with Power Management Module Missing Message; DTC U111A-00: Lost Communication with ECM/PCM "A" (ch2); DTC U111A-87: Lost Communication with ECM/PCM "A" (ch2) Missing Message; DTC U1159-87: Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message; DTC U117D-87: Lost Communication with Brake System Control Module (ch4) Missing Message [12/2024 - ] >> Typical Enabling Conditions
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Typical Enabling Conditions

U0100 AND U111A

Monitor runs whenever the following DTCs are not stored C1021 (Case 1): Brake system voltage input out of range low
C137C: Brake system voltage input out of range low
C137D: Brake system voltage input out of range high
P2531: Brake system voltage input open circuit
Both of the following conditions are met A and B
A. +BS voltage 9.5 V or more, and less than 17.4 V
B. Following condition is met 3 seconds or more
IGR voltage Higher than 10 V
U0101

Monitor runs whenever the following DTCs are not stored C1021 (Case 1): Brake system voltage input out of range low
C137C: Brake system voltage input out of range low
C137D: Brake system voltage input out of range high
All of the following conditions are met A, B and C
A. +BS voltage 9.5 V or more, and less than 17.4 V
B. Following condition is met 3 seconds or more
IGR voltage Higher than 10 V
C. Transmission type AT
U0114

Monitor runs whenever the following DTCs are not stored C1021 (Case 1): Brake system voltage input out of range low
C137C: Brake system voltage input out of range low
C137D: Brake system voltage input out of range high
All of the following conditions are met A, B and C
A. +BS voltage 9.5 V or more, and less than 17.4 V
B. Following condition is met 3 seconds or more
IGR voltage Higher than 10 V
C. Drive Type 4WD/AWD
U0125, U025E AND U1107

Monitor runs whenever the following DTCs are not stored C1021 (Case 1): Brake system voltage input out of range low
C137C: Brake system voltage input out of range low
C137D: Brake system voltage input out of range high
Both of the following conditions are met A and B
A. +BS voltage 9.5 V or more, and less than 17.4 V
B. Following condition is met 3 seconds or more
IGR voltage Higher than 10 V
U0129 AND U117D

Monitor runs whenever the following DTCs are not stored C1021 (Case 2): Brake system voltage input open circuit
C137C: Brake system voltage input out of range low
C137D: Brake system voltage input out of range high
C14C7 (Case 1): Brake system voltage circuit low
C14C8: Brake system voltage circuit high
Both of the following conditions are met -
VM1 voltage Higher than 7.3 V, and less than 23.2 V
IGR voltage Higher than 9.5 V
scientia non olet · About LEMON Manuals