DTC C0040-16 (With Auto Idle Stop System) (2017 2018)
DTC C0040-16 : Plausibility BLS vs. Pressure Sensor
NOTE:
- Before you troubleshoot, review the general troubleshooting information - Refer to:
- Troubleshoot any PGM-FI DTCs first.
| DTC Description | DTC | Freeze Frame |
|---|---|---|
| C0040-16 Plausibility BLS vs. Pressure Sensor |
DTC (VSA)
- Problem verification
- 1. Turn the vehicle to the ON mode.
- 2. Clear the DTC with the HDS.
- 3. Turn the vehicle to the OFF (LOCK) mode, then start the engine.
- 4. Wait 1 second or more without pressing the brake pedal.
- 5. Press the brake pedal hard for 1 second or more.
- 6. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame C0040-16 Plausibility BLS vs. Pressure Sensor Is DTC C0040-16 indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting - Refer to:
How to Troubleshoot the VSA System (2017 2018 2019 2020) .
If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.
- VSA modulator-control unit performance check
- 1. Check the parameter (s) below with the HDS.
NOTE: Do not press the brake pedal.
Signal Current conditions Values Unit BRAKE PRESSURE Is there 10 MPa or less?
YES
Go to step 5.
NO
Go to step 3.
- Brake pedal height check
- 1. Check the brake pedal height. Refer to: Brake Pedal and Brake Pedal Position Switch Adjustment
Is the brake pedal height OK?
YES
Go to step 4.
NO
- Brake drag check
- 1. Check for brake drag. Refer to: Brake System Symptom Troubleshooting - Rapid Brake Pad Wear, Vehicle Vibration (After A Long Drive), Or High, Hard Brake Pedal
Is the brake drag OK?
YES
Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If they are OK, replace the VSA modulator-control unit .
NO
- Brake pedal position switch performance check 1
- 1. Check the parameter (s) below with the HDS.
Signal Current conditions Values Unit BRAKE SWITCH Does the signal change ON and OFF when the brake pedal is pressed and released?
YES
Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If they are OK, replace the VSA modulator-control unit .
NO
Go to step 6.
- Brake pedal position switch performance check 2
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Brake pedal position switch 4P connector - 3. Connect terminals 1 and 2 with a jumper wire.
Terminal 1 Brake pedal position switch 4P connector (female terminals) No. 1: Terminal 2 Brake pedal position switch 4P connector (female terminals) No. 2: - 4. Turn the vehicle to the ON mode.
- 5. Check the parameter (s) below with the HDS.
Signal Current conditions Values Unit BRAKE SWITCH Does it indicate ON?
YES
Replace the brake pedal position switch .
NO
Go to step 7.
- Fuse check
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the jumper wire.
- 3. Check the following fuse.
Fuse No. B8 (10 A) Location Main under-hood fuse box Is the fuse OK?
YES
The fuse is OK. Reinstall the fuse, then go to step 14.
NO
Go to step 8.
- Shorted wire check (+B STOP (DC/DC) line) 1
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Brake pedal position switch 4P connector: disconnected Test point 1 Brake pedal position switch 4P connector (female terminals) No. 2: Test point 2 Body ground Is there continuity?
YES
Go to step9
NO
The +B STOP (DC/DC) wire is not shorted to ground. Go to step 10.
- Shorted wire check (+B STOP (DC/DC) line) 2
- 1. Remove the brake light relay. Refer to:
Relay and Control Unit Locations (2017 2018 2019 2020)
- 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Brake pedal position switch 4P connector: disconnected Brake light relay: removed Test point 1 Brake pedal position switch 4P connector (female terminals) No. 2: Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire between the brake pedal position switch and the main under-hood fuse box.
NO
Replace the brake light relay - Refer to:
- Shorted wire check (STOP SW line) 1
- 1. Jump the SCS line with the HDS, and wait more than 1 minute.
- 2. Disconnect the following connector.
VSA modulator-control unit 38P connector PCM connector A (51P) - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Brake pedal position switch 4P connector: disconnected VSA modulator-control unit 38P connector: disconnected PCM connector A (51P): disconnected Test point 1 Brake pedal position switch 4P connector (female terminals) No. 1: Test point 2 Body ground Is there continuity?
YES
Go to step 11.
NO
The STOP SW wire is not shorted to ground. Install a new No. B8 (10 A) fuse in the main under-hood fuse box, then go to step 13.
- Shorted wire check (STOP SW line) 2
- 1.Remove the brake light relay.
Relay and Control Unit Locations (2017 2018 2019 2020)
- 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Brake pedal position switch 4P connector: disconnected VSA modulator-control unit 38P connector: disconnected PCM connector A (51P): disconnected Brake light relay: removed Test point 1 Brake pedal position switch 4P connector (female terminals) No. 1: Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire between the brake pedal position switch and the PCM.
NO
The STOP SW wire is not shorted to ground. Go to step 12.
- Shorted wire check (BRAKE DIAG line)
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Brake pedal position switch 4P connector: disconnected VSA modulator-control unit 38P connector: disconnected PCM connector A (51P): disconnected Brake light relay: removed Test point 1 VSA modulator-control unit 38P connector No. 18 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire between the brake light relay and the VSA modulator-control unit.
NO
Replace the brake light relay - Refer to:
- VSA modulator-control unit check
- 1. Reconnect the following connectors.
VSA modulator-control unit 38P connector Brake pedal position switch 4P connector PCM connector A (51P) - 2. Turn the vehicle to the ON mode.
- 3. Clear the DTC with the HDS.
- 4. Turn the vehicle to the OFF (LOCK) mode, then start the engine.
- 5. Wait 1 second or more without pressing the brake pedal.
- 6. Press the brake pedal hard for 1 second or more.
- 7. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame C0040-16 Plausibility BLS vs. Pressure Sensor Is DTC C0040-16 indicated?
YES
Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If they are OK, replace the VSA modulator-control unit .
NO
Troubleshooting is complete.
- Open wire check (+B STOP (DC/DC) line)
- 1. Measure the voltage between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Brake pedal position switch 4P connector: disconnected Test point 1 Brake pedal position switch 4P connector (female terminals) No. 2: Test point 2 Body ground Is there battery voltage?
YES
The +B STOP (DC/DC) wire is OK. Go to step 15.
NO
Repair an open in the wire between the main under-hood fuse box and the brake pedal position switch.
- Open wire check (STOP SW line)
- 1. Jump the SCS line with the HDS, and wait more than 1 minute.
- 2. Disconnect the following connector.
PCM connector A (51P) - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Brake pedal position switch 4P connector: disconnected PCM connector A (51P): disconnected Test point 1 PCM connector A (51P) No. 25 - Refer to:
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 Brake pedal position switch 4P connector (female terminals) No. 1: Is there continuity?
YES
The STOP SW wire is OK. Go to step 16.
NO
Repair an open in the wire between the brake pedal position switch and the PCM.
- PCM check (substitution)
- 1. Reconnect the following connectors.
Brake pedal position switch 4P connector PCM connector A (51P) - 2. Substitute a known-good PCM. Refer to:
PCM Removal and Installation (2016 2017 2018 2019 2020)
- 3. Turn the vehicle to the ON mode.
- 4. Clear the DTC with the HDS.
- 5. Turn the vehicle to the OFF (LOCK) mode, then start the engine.
- 6. Wait 1 second or more without pressing the brake pedal.
- 7. Press the brake pedal hard for 1 second or more.
- 8. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame C0040-16 Plausibility BLS vs. Pressure Sensor Is DTC C0040-16 indicated?
YES
Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If they are OK, replace the VSA modulator-control unit .
NO
Replace the original PCM - Refer to: