ABS - Diagnostics: Wiring Toyota Sequoia I

Wiring Diagram

For speed sensor circuit wiring diagram (Scheme 60)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 60

For ABS & VSC solenoid circuit wiring diagram (Scheme 61)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 61

For a wiring diagram of ABS & VSC relay circuit (Scheme 62)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 62

Scheme 63

1. Check voltage between terminals +BS, +BM and GND of skid control ECU connector. Preparation: Disconnect the skid control ECU connector. Check: Measure the voltage between terminals +BS(16), +BM(47) and GND(15, 46) of skid control ECU harness side connector. (Scheme 63) OK: Voltage: 10-14 V.
2. NG: Check and replace ABS fuses. Check and repair harness or connector.
3. OK: If the same code is still output after the DTC is deleted, check the contact condition of each connection. If the connections are normal, the ECU may be defective. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK.

For wiring diagram of ECM communication circuit (Scheme 64)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 64

For steering angle sensor circuit wiring diagram (Scheme 65)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 65

For wiring diagram of yaw rate sensor circuit (Scheme 66)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 66

Scheme 67

Scheme 68

Scheme 69

Scheme 70

1. Is DTC Still Output? Check DTC, see Step 1) e or f. NO: No problem. YES: Go to step 2.
2. Check Output Value Of The Yaw Rate Sensor. In case of using the TOYOTA hand-held tester: Preparation: Remove the 2 bolts and yaw rate sensor assembly with connector still connected. (Scheme 67) Connect the TOYOTA hand-held tester to the DLC3. Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON. Select the DATALIST mode on the TOYOTA hand-held tester. Check: That the yaw rate value of the yaw rate sensor displayed on the TOYOTA hand-held tester is changing: Place the yaw rate sensor vertically to the ground and turn the sensor pivoted on its center. OK: yaw rate value must be changing. In case of not using the TOYOTA hand-held tester: Preparation: Remove the 2 bolts and yaw rate sensor assembly with connector still connected. (Scheme 67) Turn the ignition switch ON. Measure voltage between terminals 3 and 2, 1 and 2 of the yaw rate sensor with connector still connector. (Scheme 68) OK: (Scheme 69) NOTE: When replacing the yaw rate sensor, perform the zero point calibration. See step 6 under PRE-CHECK. NG: Replace yaw rate sensor assembly. OK: Go to step 3.
3. Check Voltage Between Terminals VYS And GND Of Skid Control ECU. Preparation: Remove the Skid Control ECU with connector still connected. Check: Turn the ignition switch ON. Measure voltage between terminals (VYS(27) and GND(15, 46) of skid control ECU. (Scheme 70) OK: Voltage: 4.5-5.5 V NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Check and replace skid control ECU. NG: Go to step 4.
4. Check For Open And Short Circuit In Harness And Connector Between Yaw Rate Sensor And Skid Control ECU. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000). NG: Repair or replace harness or connector. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Check and replace skid control ECU.

For wiring diagram of yaw power source circuit (Scheme 71)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 71

Scheme 72

Scheme 73

1. Check ECU-IG Fuse. Preparation: Remove ECU-IG fuse from the instrument panel J/B. (Scheme 72) Check: Check continuity of ECU-IG fuse. OK: Continuity. NG: Check for short circuit in all the harness and components connected to ECU-IG fuse. (Scheme 72) OK: Go to next step.
2. Check Battery Position Voltage. OK: Voltage: 10-14 V. NG: Check and repair the charging system. OK: Go to step 3.
3. Check Voltage Of The ECU IG Power Source. In case of using the TOYOTA hand-held tester: Preparation: Connect the TOYOTA hand-held tester to the DLC3. Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON. Select the DATALIST mode on the TOYOTA hand-held tester. Check: Check the voltage condition output from the ECU displayed on the TOYOTA hand-held tester. OK: "Normal" is displayed. In case of using the TOYOTA hand-held tester: Preparation: Disconnect the skid control ECU connector. Check: Turn the ignition switch ON. Measure voltage between terminals IG (44) and GND (15, 46) of skid control ECU harness side connector. (Scheme 73) OK: Voltage: 10-14 V. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Check and replace skid control ECU. NG: Go to next step.
4. Check Continuity Between Terminal GND Of Skid Control ECU Connector And Body Ground. Check: Measure resistance between terminal GND (15, 46) of skid control ECU harness side connector and body ground. (Scheme 73) OK: Resistance: One ohm or less NG Repair or replace harness or connector. OK: Check for open circuit in harness and connector between skid control ECU and battery. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000).

For wiring diagram of stop light switch circuit (Scheme 74)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 74

Scheme 75

1. Check Operation Of The Stop Light Switch. Check: That the stop lights light up when brake pedal is depressed and turn OFF when the brake pedal is released. NG: «LOCATION»(ref-174833-S18936371472005041100000). OK: Go to next step.
2. Check Voltage Between Terminal STP Of Skid Control ECU And Body Ground. Preparation: Disconnect skid control ECU connector. Check: Measure voltage between terminal STP (23) of skid control ECU harness side connector and body ground when the brake pedal is depressed. (Scheme 75) OK: Voltage: 8-14 V NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Check and replace skid control ECU. NG: Go to next step.
3. Check for open circuit in harness and connector between skid control ECU and stop light switch. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000). NG: Repair or replace harness or connector. OK: Proceed to next circuit inspection shown on problem symptoms table. See «PROBLEM SYMPTOMS»(ref-170284-S07958387692005062700000) table.

For wiring diagram of ABS & VSC pump motor lock (Scheme 76)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 76

For active brake booster solenoid circuit wiring diagram (Scheme 77)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 77

Scheme 78

1. Check Active Brake Booster Solenoid. PREPARATION: disconnect the connector from brake booster. Check: Resistance between terminals 3 and 4 of brake booster. (Scheme 78) OK: Resistance: 1.1-1.7 ohms NG: Replace brake booster. OK: Go to step 2.
2. Check for open and short circuit in harness and connector between skid control ECU and brake booster. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000). NG: Repair or replace harness or connector. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Check and replace skid control ECU.

For brake inhibit relay circuit wiring diagram (Scheme 79)

Scheme 79

Scheme 80

Scheme 81

Scheme 82

Scheme 83

1. Check Voltage Between Terminal 1 And 3 Of Brake Inhibit Relay And Body Ground. Preparation: Remove the brake inhibit relay from the connector. Check: Turn the ignition switch ON. Measure the voltage between terminal 1 of brake inhibit relay harness side connector and body ground. (Scheme 80) OK: Voltage; 10-14 V. Check: Measure the voltage between terminal 3 of brake inhibit relay harness side connector and body ground when the brake pedal is depressed. OK: Voltage: 8-14 V. NG: Check and repair harness or connector. OK: Go to next step.
2. Check Brake Inhibit Relay. CHECK: Continuity between following terminals of brake inhibit relay. (Scheme 81) For OK: conditions (Scheme 82) CHECK: Apply battery positive voltage between terminals 1 and 4. Check continuity between terminals. For expected conditions (Scheme 83) NG: Replace brake inhibit relay. OK: Go to step 3.
3. Check For Open And Short Circuit In Harness And Connector Between Brake Inhibit Relay And Skid Control ECU. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000). NG: Repair or replace harness or connector. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK: If the same code is still output after the DTC is deleted, check the contact condition of each connection. If the connections are normal, the ECU may be defective.

For center differential lock circuit wiring diagram (Scheme 84)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 84

For master cylinder pressure sensor wiring diagram (Scheme 85)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 85

For abnormally battery voltage of VSC sensor wiring diagram (Scheme 86)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 86

Scheme 87

1. Check Battery Positive Voltage OK: Voltage: 10-14 V. NG: Check and repair the «GENERATORS & REGULATORS»(ref-170107). OK: Go to next step.
2. Check skid control ECU. Preparation: Remove the skid control ECU with connector still connected. Check: Turn the ignition switch ON. Measure voltage between terminals VCM (43) and E1 (28), VCM2 (41) and E2 (26), GYAW (11) and VYS (27), GGND (9) and VGS (25) of skid control ECU. (Scheme 87) OK: Voltage: 4.5-5.5 V. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Check and replace Skid Control ECU. NG: Go to step c.
3. Check master cylinder pressure sensor No. 1. Preparation: Disconnect the connector from the master cylinder pressure sensor No. 1. Check: Turn the ignition switch ON. Measure voltage between terminals VCM (43) and E1 (28), VCM2 (41) and E2 (26), GYAW (11) and VYS (27), GGND (9) and VGS (25) of Skid Control ECU. OK: Voltage: 4.5-5.5 V. OK: Replace master cylinder pressure sensor No. 1. NOTE: When replacing the master cylinder pressure sensor, perform the zero point calibration. See step 6 under PRE-CHECK. NG: Go to step d.
4. Check master cylinder pressure sensor No. 2. Preparation: Disconnect the connector from the master cylinder pressure sensor No. 2. Check: Turn the ignition switch ON. Measure voltage between terminals VCM (43) and E1 (28), VCM2 (41) and E2 (26), GYAW (11) and VYS (27), GGND (9) and VGS (25) of Skid Control ECU. (Scheme 87) OK: Voltage: 4.5-5.5 V NOTE: When replacing the master cylinder pressure sensor, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Replace master cylinder pressure sensor No. 2. NG: Go to step e.
5. Check deceleration sensor. Preparation: disconnect the connector from the deceleration sensor. Check: Turn the ignition switch ON. Measure voltage between terminals VCM (43) and E1 (28), VCM2 (41) and E2 (26), GYAW (11) and VYS (27), GGND (9) and VGS (25) of Skid Control ECU. (Scheme 87) OK: Voltage: 4.5-5.5 V. NOTE: When replacing the yaw rate sensor, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Replace yaw rate sensor assembly. NG: Go to next step.
6. Check yaw rate sensor. Preparation: Disconnect the connector from the deceleration sensor. Check: Turn the ignition switch ON. Measure voltage between terminals VCM (43) and E1 (28), VCM2 (41) and E2 (26), GYAW (11) and VYS (27), GGND (9) and VGS (25) of Skid Control ECU. (Scheme 87) OK: Voltage: 4.5-5.5 V. NOTE: When replacing the yaw rate sensor, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Replace yaw rate sensor assembly. NG: Go to next step.
7. Check for open and short circuit in harness and connector between master cylinder pressure sensor No. 1, master cylinder pressure sensor No. 2, deceleration sensor, yaw rate sensor and skid control ECU. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000). NG: Repair or replace harness or connector. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Check and replace skid control ECU.

Scheme 88

For booster pedal force switch circuit wiring diagram (Scheme 89)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 89

Scheme 90

Scheme 91

Scheme 92

Scheme 93

1. Check Booster Pedal Force Switch. Preparation in case of using the oscilloscope: Connect the oscilloscope to the between terminals PSNO(1) and STS(5), PSNC(2) and STS(5) of the brake booster with connector still connected. Turn the ignition switch ON. Check: The signal waveform in the case where the brake pedal is depressed and released. OK: (Scheme 91)for more information or specifications. Preparation in case of not using the oscilloscope: Disconnect the connector from the brake booster. Turn the ignition switch ON. Check: Continuity between the terminals in case where the brake pedal is depressed and released. OK: (Scheme 92)for more information. NG: Replace brake booster. OK: Go to step 2.
2. Check For Open And Short Circuit In Harness And Connector Between Booster Pedal Switch And Skid Control ECU. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000). NG: Repair or replace harness or connector. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK: Check and replace skid control ECU.

For ECU communication system malfunction wiring diagram (Scheme 94)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 94

Scheme 95

1. Check Translate ECU Communication. Reference : inspection using oscilloscope. Preparation : Remove the translate ECU. Connect the oscilloscope to the terminal VSC+ (4) and GND (14) of the translate ECU harness side connector. Check : Start the engine, and check the signal waveform. OK : Check and replace translate ECU. NG : Go to step 2 .
2. Check for open and short circuit in harness and connector between each of terminals VSC+ and VSC- of translate ECU and skid control ECU. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000) . NG : Repair or replace harness or connector. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK : Check and replace skid control ECU.

For NEO signal circuit wiring diagram (Scheme 96)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 96

Scheme 97

Scheme 98

Scheme 99

1. Check For Open And Short Circuit In Harness And Connector Between Terminal NEO Of Translate ECU And Terminal NEO Of ECM. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000). NG: Repair or replace harness and connector. OK: Go to step 2.
2. Check Voltage Between Terminal NEO (13) Of Translate ECU And Body Ground. Preparation: remove the translate ECU with connectors still connected. Check: Turn the ignition switch ON. Measure the voltage between terminal 13 of the translate ECU and body ground under the engine conditions below. OK: For specifications (Scheme 98)and (Scheme 99). NG: Check and replace ECM. OK: Check and replace translate ECU. If the same code is still output after the DTC is deleted, check the contact condition of each connection.

For ECM communication circuit malfunction wiring diagram (Scheme 100)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 100

Scheme 101

1. Check Translate ECU Communication. Reference: inspection using oscilloscope Preparation : Remove the translate ECU. Connect the oscilloscope to each of the terminals ENG+ or TRC+ and GND of the translate ECU harness side connector. Check : Start the engine, and check the signal waveform. OK : Check and replace translate ECU. NG : Go to next step.
2. Check for open and short circuit in harness and connector between each of terminals ENG+, ENG-, TRC+ and TRC- of translate ECU and ECM. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000) . NG : Repair or replace harness or connector. OK : Check and replace ECM.

For ABS warning light and skid control ECU wiring diagram (Scheme 102)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 102

Scheme 103

1. Is DTC Output ? Check DTC, see steps 1) e or f . YES : Repair circuit indicated by the output code. NO , go to step 2 .
2. Check That The Skid Control ECU Connector Are Securely Connected To The Skid Control ECU. NG : Connect the connector to the skid control ECU. OK : Go to next step.
3. Check Voltage Between Terminals IG1 And GND Of Skid Control ECU Connector. Preparation : Disconnect the skid control ECU connector. Check : Turn the ignition switch ON. Measure voltage between terminals IG1 (44) and GND (15, 46) of skid control ECU harness side connector. OK : Voltage: 10-14 V. NG : Check for open and short circuit in harness and connector between ECU-IG fuse and skid control ECU. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000) . OK : Go to step 4 .
4. Check battery positive voltage. Check : The battery positive voltage. OK : Voltage: 10-14 V. NG : Check and repair the «GENERATORS & REGULATORS»(ref-170107) . OK : Go to step 5 .
5. Check The TC Terminal Circuit . See «TC Terminal Circuit»(ref-170284-S17965669832005011000000) . NG : Repair or replace the TC terminal circuit. OK : Go to next step.
6. Check Operation Of The ABS Warning Light. Preparation in case of using the TOYOTA hand-held tester: Connect the TOYOTA hand-held tester to the DLC3. Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON. Select the ACTIVE TEST mode on the TOYOTA hand-held tester. Check : That "ON" and "OFF" of the ABS warning light can be shown on the combination meter by the TOYOTA hand-held tester. Preparation in case of not using the TOYOTA hand-held tester: Turn the ignition switch OFF. Disconnect the connector from the skid control ECU. Turn the ignition switch ON. Check : The ABS warning light goes off. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK : Check and replace skid control ECU. NG : Go to next step.
7. Check ABS Warning Light. «PROBLEM SYMPTOMS»(ref-172774-S06897156002005041500000) . NG : Repair or replace bulb or combination meter. OK : Check for short circuit in harness and connector between ABS warning light and skid control ECU.

For ABS warning light circuit wiring diagram (Scheme 104)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 104

For VSC TRAC warning light circuit wiring diagram (Scheme 105)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 105

For BRAKE warning light circuit wiring diagram (Scheme 106)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 106

For SLIP indicator light circuit wiring diagram (Scheme 107)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 107

For indicator light & switch circuit VSC/TRAC OFF wiring diagram (Scheme 108)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 108

For VSC buzzer circuit wiring diagram (Scheme 109)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 109

For TC terminal circuit wiring diagram (Scheme 110)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 110

Scheme 111

1. Check Voltage Between Terminals TC And CG Of The DLC3. Preparation : turn the ignition switch ON. Check : measure voltage between terminal TC and CG of DLC3. OK : Voltage: 10-14 V. OK : If ABS warning light does not blink even after TC and CG have been connected, the ECU may be defective. NG : Go to step 2 .
2. With Ignition Switch OFF, Check For Open And Short Circuit In Harness And Connector Between Skid Control ECU And DLC3, DLC3 And Body Ground. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000) . NG : Repair or replace harness or connector. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK : Check and replace skid control ECU.

For TS terminal circuit wiring diagram (Scheme 112)

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Scheme 112

Scheme 113

1. Check Voltage Between Terminals TS And CG Of DLC3. Check : Turn the ignition switch ON. Measure voltage between terminals TS and CG of DLC3. OK : Voltage: 10-14 V. OK : If ABS warning light does not blink even after TS and CG have been connected, the ECU may be defective. NG : Go to step 2 .
2. Check For Open And Short Circuit In Harness And Connector Between Skid Control ECU And DLC3, DLC3 And Body Ground. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-174490-S11972379492005040500000) . NG : Repair or replace harness or connector. NOTE: When replacing the ECU, perform the zero point calibration. See step 6 under PRE-CHECK. OK : Check and replace skid control ECU.

WIRING DIAGRAMS

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.