DTC P0651 (PGM-FI System (1.5 L Engine))
DTC P0651 : Sensor Reference Voltage B Malfunction
NOTE: Before you troubleshoot, review the general troubleshooting information .
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P0651 Sensor Reference Voltage B Malfunction |
DTC (PGM-FI)
- 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.
-4. Turn the vehicle to the ON mode.
-5. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC P0651 Sensor Reference Voltage B Malfunction Is DTC P0651 indicated?
YES
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 .
- CMP sensor A
- CMP sensor B
- Turbocharger boost sensor
- Turbocharger
- APP sensor
- A/C pressure sensor
- MAF sensor/IAT sensor 1
- EVAP leak check module (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.
CMP sensor A 3P connector CMP sensor B 3P connector Turbocharger boost sensor 3P connector Turbocharger 5P connector APP sensor 6P connector A/C pressure sensor 3P connector MAF sensor/IAT sensor 1 4P connector EVAP leak check module 8P connector (USA and Canada models) -3. Turn the vehicle to the ON mode.
-4. Clear the DTC with the HDS.
-5. Turn the vehicle to the OFF (LOCK) mode.
-6. Turn the vehicle to the ON mode.
-7. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC P0651 Sensor Reference Voltage B Malfunction Is DTC P0651 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:
- CMP sensor A
- CMP sensor B
- Turbocharger boost sensor
- Turbocharger
- APP sensor
- A/C pressure sensor
- MAF sensor/IAT sensor 1
- EVAP leak check module (USA and Canada models)
DTC Description Confirmed DTC Pending DTC P0651 Sensor Reference Voltage B Malfunction Is DTC P0651 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.
- CMP sensor A
- CMP sensor B
- Turbocharger boost sensor
- Turbocharger
- APP sensor
- A/C pressure sensor
- MAF sensor/IAT sensor 1
- EVAP leak check module (USA and Canada models)
- 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 CMP sensor A 3P connector: disconnected CMP sensor B 3P connector: disconnected Turbocharger boost sensor 3P connector: disconnected Turbocharger 5P connector: disconnected APP sensor 6P connector: disconnected A/C pressure sensor 3P connector: disconnected MAF sensor/IAT sensor 1 4P connector EVAP leak check module 8P connector (USA and Canada models) PCM connector A (50P): disconnected PCM connector E (80P): disconnected Connector Terminal PCM connector A (50P) No. 44 PCM connector E (80P) No. 63 and No. 77 Is there any voltage?
YES
Repair a short to power in the VCC wire between the PCM (A44, E63, E77) 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. Check for continuity between these test points and body ground individually.
Test condition Vehicle OFF (LOCK) mode CMP sensor A 3P connector: disconnected CMP sensor B 3P connector: disconnected Turbocharger boost sensor 3P connector: disconnected Turbocharger 5P connector: disconnected APP sensor 6P connector: disconnected A/C pressure sensor 3P connector: disconnected MAF sensor/IAT sensor 1 4P connector EVAP leak check module 8P connector (USA and Canada models) PCM connector A (50P): disconnected PCM connector E (80P): disconnected Connector Terminal PCM connector A (50P) No. 44 PCM connector E (80P) No. 63 and No. 77 Is there continuity?
YES
Repair a short to ground in the VCC wire between the PCM (A44, E63, E77) 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 .