DTC P0651 (PGM-FI System (Without Auto Idle Stop System))
DTC P0651 : Sensor Reference Voltage B Malfunction
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| 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. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame P0651 Sensor Reference Voltage B Malfunction Is DTC P0651 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:?
- APP sensor
- Throttle body
- Rocker arm oil pressure sensor
- Input shaft (mainshaft) speed sensor
- Determine possible failure area (VCC lines, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
APP sensor 6P connector Throttle body 6P connector Rocker arm oil pressure sensor 3P connector Input shaft (mainshaft) speed sensor 3P 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 Freeze Frame P0651 Sensor Reference Voltage B Malfunction Is DTC P0651 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:
- APP sensor
- Throttle body
- Rocker arm oil pressure sensor
- Input shaft (mainshaft) speed sensor
DTC Description Confirmed DTC Pending DTC Freeze Frame 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.
- APP sensor
- Throttle body
- Rocker arm oil pressure sensor
- Input shaft (mainshaft) speed 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.
- 3. Disconnect the following connectors.
- 4. Turn the vehicle to the ON mode.
- 5. Check for continuity between these test points and body ground individually.
Test condition Vehicle OFF (LOCK) mode APP sensor 6P connector: disconnected Throttle body 6P connector: disconnected Rocker arm oil pressure sensor 3P connector: disconnected Input shaft (mainshaft) speed sensor 3P connector: disconnected PCM connector A (51P): disconnected PCM connector B (51P): disconnected Connector Test circuit Terminal PCM connector B (51P) VCC2 No. 43 (GRN) PCM connector A (51P) VCC4 No. 42 (LT BLU) PCM connector B (51P) VCC5 No. 44 (BLU) Is there about 5.2V or more?
YES
Repair a short to power in the VCC wire between the PCM (A42, B43, or B44) 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 APP sensor 6P connector: disconnected Throttle body 6P connector: disconnected Rocker arm oil pressure sensor 3P connector: disconnected Input shaft (mainshaft) speed sensor 3P connector: disconnected PCM connector A (51P): disconnected PCM connector B (51P): disconnected Connector Test circuit Terminal PCM connector B (51P) VCC2 No. 43 (GRN) PCM connector A (51P) VCC4 No. 42 (LT BLU) PCM connector B (51P) VCC5 No. 44 (BLU) Is there continuity?
YES
Repair a short in the VCC wire between the PCM (A42, B43, or B44) and each part that was disconnected in step 2.
NO
The VCC wires are OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (2014 2015), or PCM Removal and Installation (2016) .