DTC P0641 (PGM-FI System: 6-Speed A/T, '16-'18 9-Speed A/T)
DTC P0641 : Sensor Reference Voltage A Malfunction
NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System .
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| 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 Freeze Frame 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 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 - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System .
- MAP sensor
- EGR valve
- Fuel rail pressure sensor
- APP sensor
- Output shaft (countershaft) speed sensor (6-speed automatic transmission)
- Brake booster pressure sensor (with auto idle stop system)
- FTP sensor (USA and Canada models)
- 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 Output shaft (countershaft) speed sensor 3P connector (6-speed automatic transmission) Brake booster pressure sensor 3P connector (with auto idle stop system) FTP sensor 3P connector (USA and Canada models) - 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 Freeze Frame 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
- Output shaft (countershaft) speed sensor (6-speed automatic transmission)
- Brake booster pressure sensor (with auto idle stop system)
- FTP sensor (USA and Canada models)
DTC Description Confirmed DTC Pending DTC Freeze Frame 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
- Output shaft (countershaft) speed sensor (6-speed automatic transmission)
- Brake booster pressure sensor (with auto idle stop system)
- FTP sensor (USA and Canada models)
- Shorted wire check (VCC lines)
- 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. 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 Output shaft (countershaft) speed sensor 3P connector (6-speed automatic transmission) Brake booster pressure sensor 3P connector (with auto idle stop system) : disconnected FTP sensor 3P connector (USA and Canada models) : disconnected PCM connector A (51P): disconnected PCM connector C (51P): disconnected Connector Terminal PCM connector A (51P) - Refer to:
PCM Connector for Inputs and Outputs (16-18, 9-Speed A/T), or
PCM Connector for Inputs and Outputs (16-20 6-Speed A/T)No. 19 and No. 41 PCM connector C (51P) - Refer to:
PCM Connector for Inputs and Outputs (16-20 6-Speed A/T), or
PCM Connector for Inputs and Outputs (16-18, 9-Speed A/T)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 (6-Speed A/T, 16-18 9-Speed A/T) .