DTC P0641
DTC P0641 : Sensor Reference Voltage A Malfunction
NOTE: Before you troubleshoot, review the general troubleshooting information .
| 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 :
- CKP sensor
- MAP sensor
- Throttle body
- APP sensor
- Determine possible failure area (VCC lines, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the connectors from these parts:
CKP sensor 3P connector MAP sensor 3P connector Throttle body 6P connector APP sensor 6P connector -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 5.
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:
- CKP sensor 3P connector
- MAP sensor 3P connector
- Throttle body 6P connector
- APP sensor 6P connector
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.
- CKP sensor
- MAP sensor
- Throttle body
- APP sensor
- 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 (50P) PCM connector E (80P) -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 CKP sensor 3P connector: disconnected MAP sensor 3P connector: disconnected Throttle body 6P connector: disconnected APP sensor 6P connector: disconnected PCM connector A (50P): disconnected PCM connector E (80P): disconnected Connector Terminal PCM connector A (50P) No. 45 PCM connector E (80P) No. 70 and No. 75 Is there any voltage?
YES
Repair a short to power in the VCC wire(s) between the PCM (A45, E70, E75) and each part that was disconnected in step 2.
NO
Go to step 5.
- Shorted wire check (VCC lines to ground)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Measure the resistance between these test points and body ground individually.
Test condition Vehicle OFF (LOCK) mode CKP sensor 3P connector: disconnected MAP sensor 3P connector: disconnected Throttle body 6P connector: disconnected APP sensor 6P connector: disconnected PCM connector A (50P): disconnected PCM connector E (80P): disconnected Connector Terminal PCM connector A (50P) No. 45 PCM connector E (80P) No. 70 and No. 75 Is there 1 MΩ or more?
YES
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 .
NO
Repair a short to ground in the VCC wire(s) between the PCM (A45, E70, E75) and each part that was disconnected in step 2.