DTC P0641 (2017 2018 2019 2020 PGM-FI System)
DTC P0641 : Sensor Reference Voltage A Malfunction
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P0641 Sensor Reference Voltage A Malfunction |
DTC (PGM-FI)
- Problem verification
-1. Turn the vehicle to the ON mode.
- 2. Clear the DTC with the HDS.
- 3. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC P0641 Sensor Reference Voltage A Malfunction Is DTC P0641 indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the PCM and these parts. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016) .
- MAP sensor
- EGR valve
- Fuel rail pressure sensor
- APP sensor
- FTP sensor
- A/C pressure sensor
- Brake booster pressure sensor (With auto idle stop system)
- Determine possible failure area (VCC lines, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
MAP sensor 3P connector EGR valve 5P connector Fuel rail pressure sensor 3P connector APP sensor 6P connector FTP sensor 3P connector A/C pressure sensor 3P connector Brake booster pressure sensor 3P connector (With auto idle stop system) - 3. Turn the vehicle to the ON mode.
- 4. Clear the DTC with the HDS.
- 5. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC P0641 Sensor Reference Voltage A Malfunction Is DTC P0641 indicated?
YES
Go to step 4.
NO
Go to step 3.
- Shorted part check
-1. Check for Pending or Confirmed DTCs with the HDS while reconnecting these parts, one at a time:
- MAP sensor
- EGR valve
- Fuel rail pressure sensor
- APP sensor
- FTP sensor
- A/C pressure sensor
- Brake booster pressure sensor (With auto idle stop system)
DTC Description Confirmed DTC Pending DTC P0641 Sensor Reference Voltage A Malfunction Is DTC P0641 indicated?
YES
Replace the part that caused the DTC when it was reconnected.
NO
Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1.
- MAP sensor
- EGR valve
- Fuel rail pressure sensor
- APP sensor
- FTP sensor
- A/C pressure sensor
- Brake booster pressure sensor (With auto idle stop system)
- Shorted wire check (VCC lines to power)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Jump the SCS line with the HDS, and wait more than 1 minute.
- 3. Disconnect the following connectors.
PCM connector A (51P) PCM connector C (51P) - 4. Turn the vehicle to the ON mode.
- 5. Measure the voltage between these test points and body ground individually.
Test condition Vehicle ON mode MAP sensor 3P connector: disconnected EGR valve 5P connector: disconnected Fuel rail pressure sensor 3P connector: disconnected APP sensor 6P connector: disconnected FTP sensor 3P connector: disconnected A/C pressure sensor 3P connector: disconnected Brake booster pressure sensor 3P connector: disconnected (With auto idle stop system) PCM connector A (51P): disconnected PCM connector C (51P): disconnected Connector Terminal PCM connector A (51P) - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016) No. 19 and No. 41 PCM connector C (51P) - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016) No. 32 Is there about 5.2V or more?
YES
Repair a short to power in the VCC wire between the PCM (A19, A41, or C32) and each part that was disconnected in step 2.
NO
Go to step 5.
- Shorted wire check (VCC lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Check for continuity between these test points and body ground individually.
Test condition Vehicle OFF (LOCK) mode MAP sensor 3P connector: disconnected EGR valve 5P connector: disconnected Fuel rail pressure sensor 3P connector: disconnected APP sensor 6P connector: disconnected FTP sensor 3P connector: disconnected A/C pressure sensor 3P connector: disconnected Brake booster pressure sensor 3P connector: disconnected (With auto idle stop system) PCM connector A (51P): disconnected PCM connector C (51P): disconnected Connector Terminal PCM connector A (51P) - Refer to: PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016), or PCM Connector for Inputs and Outputs (2017 2018 2019 2020) No. 19 and No. 41 PCM connector C (51P) - Refer to: PCM Connector for Inputs and Outputs (2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (2014 2015), or PCM Connector for Inputs and Outputs (2016) No. 32 Is there continuity?
YES
Repair a short in the VCC wire between the PCM (A19, A41, or C32) and each part that was disconnected in step 2.
NO
The VCC wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good PCM - Refer to: PCM Removal and Installation (2016), or PCM Removal and Installation (2014 2015) .