Toyota Service Blog

2001 Toyota Sequoia Yaw Check

a. Turn the ignition switch ON.

b. 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.

Fig. 77: Checking Skid Control ECU

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

OK: Check and replace skid control ECU. NG: GO TO NEXT STEP 3. Check master cylinder pressure sensor No. 1.

PREPARATION:

Disconnect the connector from the master cylinder pressure sensor No. 1. CHECK:

a. Turn the ignition switch ON.

b. 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.

Fig. 78: Checking Master Cylinder Pressure Sensor No. 1

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

OK: Replace master cylinder pressure sensor No. 1. NG: GO TO NEXT STEP 4. Check master cylinder pressure sensor No. 2.

PREPARATION:

Disconnect the connector from the master cylinder pressure sensor No. 2. CHECK:

a. Turn the ignition switch ON.

b. 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.

Fig. 79: Checking Master Cylinder Pressure Sensor No. 2

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

OK: Replace master cylinder pressure sensor No. 2. NG: GO TO NEXT STEP 5. Check deceleration sensor.

PREPARATION:

Disconnect the connector from the deceleration sensor.

CHECK:

a. Turn the ignition switch ON.

b. 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.

Fig. 80: Checking Deceleration Sensor

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

OK: Replace yaw rate sensor assembly. NG: GO TO NEXT STEP 6. Check yaw rate sensor.

PREPARATION:

Disconnect the connector from the yaw rate sensor.

CHECK:

a. Turn the ignition switch ON.

b. 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.

Fig. 81: Checking Yaw Rate Sensor

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