DTC C0040[62] Stop Lamp Switch and Pressure Sensor Signal Compare Failure (ABS/ESC)

1. Brake control system check

Refer to "54.Brake Control 4A.Troubleshooting(ABS/ESC) diagnostic System Check - Brake Controls".

2. Prioritized DTC check

1) Turn OFF the ignition switch.

2) Connect the scan tool.

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool. Is DTC U0100[86], U0100[87], or U1800[86] set at the same time?

Yes

Go to the applicable DTC diagnosis.

Refer to "54.Brake Control 4A.Troubleshooting(ABS/ESC) DTC U0100[86] Data Length Code Error With ECM".

Refer to "54.Brake Control 4A.Troubleshooting(ABS/ESC) DTC U0100[87] Lost Communication With ECM".

Refer to "54.Brake Control 4A.Troubleshooting(ABS/ESC) DTC U1800[86] Invalid Data Received From ECM".

No

=>Go to ECM DTC check.

3. ECM DTC check

1) Observe the ECM DTC information with a scan tool. Is a DTC set?

Yes

Go to the applicable DTC diagnosis.

No

=>Go to Parameter check.

4. Parameter check

1) Turn OFF the ignition switch.

2) Connect the scan tool.

3) Turn ON the ignition switch.

4) Observe the Brake Pedal Status parameter on the scan tool. Does it show ON when the brake pedal is depressed and OFF when released, responding in accordance with the brake pedal operation?

Yes

=>Go to Repair verification.

No

=>Go to EHCU replacement.

5. EHCU replacement

Refer to "4.Brakes 4Z.Brake Electrical Control EHCU removal".

Refer to "4.Brakes 4Z.Brake Electrical Control EHCU installation".

Refer to "4.Brakes 4Z.Brake Electrical Control EHCU setting".

Procedure completion

=>Go to Repair verification.

6. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch.

3) Operate under the conditions for setting the DTC.

4) Observe the DTC information with a scan tool.