DTC P0641
DTC P0641 : Sensor Reference Voltage A Malfunction
NOTE: Before you troubleshoot, review the general troubleshooting information .
| 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 :
- MAP sensor
- APP sensor
- Throttle body
- CVT input shaft (drive pulley) speed sensor (CVT model)
- Output shaft (countershaft) speed sensor (M/T model)
- 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
- APP sensor 6P connector
- Throttle body 6P connector
- CVT input shaft (drive pulley) speed sensor 3P connector (CVT model)
- Output shaft speed sensor 3P connector (M/T model)
-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:
Check for Pending or Confirmed DTCs with the HDS while reconnecting these parts, one at a time:
- MAP sensor
- APP sensor
- Throttle body
- CVT input shaft (drive pulley) speed sensor (CVT model)
- Output shaft (countershaft) speed sensor (M/T model)
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
- APP sensor
- Throttle body
- CVT input shaft (drive pulley) speed sensor (CVT model)
- Output shaft (countershaft) speed sensor (M/T model)
- Shorted wire check (VCC lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Jump the SCS line with the HDS.
-3. Disconnect the following connectors.
PCM connector A (51P) PCM connector B (51P) PCM connector C (51P) -4. Check for continuity between the appropriate PCM connector terminal and body ground individually (see table).
Test condition Vehicle OFF (LOCK) mode MAP sensor 3P connector: disconnected APP sensor 6P connector: disconnected Throttle body 6P connector: disconnected CVT input shaft (drive pulley) speed sensor 3P connector (CVT model): disconnected Output shaft speed sensor 3P connector (M/T model): disconnected PCM connector A (51P): disconnected PCM connector B (51P): disconnected PCM connector C (51P): disconnected Connector Terminal PCM connector A (51P) No. 38 PCM connector B (51P) No. 41 PCM connector C (51P) No. 18 Is there continuity?
YES
Repair a short in the VCC wire between the PCM (A38, B41 or C18) and each part that was disconnected in step 2-2.
NO
The VCC wires are OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0641 goes away and the PCM was updated, troubleshooting is complete. If DTC P0641 goes away and the PCM was substituted, replace the original PCM .