REPAIR VERIFICATION
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1. Turn the ignition switch to LOCK (0).
2. Reconnect all connectors.
3. Turn the ignition switch to ON (II).
4. Reset the PCM with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW
TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
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5. DO THE PCM IDLE LEARN PROCEDURE .
6. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P0641 SENSOR REFERENCE VOLTAGE A
MALFUNCTION
Is DTC P0641 indicated?
YES : Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1.
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MAP sensor
Output shaft (countershaft) speed sensor
Throttle body
APP sensor
NO : Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated
DTC's troubleshooting.
DTC P0651: SENSOR REFERENCE VOLTAGE B MALFUNCTION
Fig. 273: DTC Troubleshooting Flow Chart (P0651)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
Before you troubleshoot, record all freeze data and any on-board snapshot, and
review the general troubleshooting information See HOW TO TROUBLESHOOT
THE A/T SYSTEM or HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS
SYSTEMS .
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P0651 SENSOR REFERENCE VOLTAGE B
MALFUNCTION
1. Problem verification:
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1. Turn the ignition switch to ON (II).
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2. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE FUEL AND
EMISSIONS SYSTEMS or HOW TO TROUBLESHOOT THE A/T SYSTEM .
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3. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
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:
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APP sensor
A/C pressure sensor
FTP sensor
Input shaft (mainshaft) speed sensor
2. Determine possible failure area (VCC lines, others):
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1. Turn the ignition switch to LOCK (0).
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2. Disconnect the connectors from these parts:
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APP sensor
A/C pressure sensor
FTP sensor
Input shaft (mainshaft) speed sensor
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Turn the ignition switch to ON (II).
Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW
TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P0651 SENSOR REFERENCE VOLTAGE B
MALFUNCTION
Is DTC P0651 indicated?
YES : Go to step 4.
NO : Go to step 3.
3. Shorted part check:
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1. Check for Pending or Confirmed DTCs with the HDS while reconnecting these parts, one at a
time:
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APP sensor
A/C pressure sensor
FTP sensor
Input shaft (mainshaft) speed sensor
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P0651 SENSOR REFERENCE VOLTAGE B
MALFUNCTION
Is DTC P0651 indicated?
YES : Replace the part that caused the DTC when it was reconnected, then do the repair verification .
NO : Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1.
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ο¬
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APP sensor
A/C pressure sensor
FTP sensor
Input shaft (mainshaft) speed sensor
4. Shorted wire check (VCC lines):
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1. Turn the ignition switch to LOCK (0).
2. Jump the SCS line with the HDS.
3. Disconnect the following connector.
PCM connectors A (49P)
PCM connectors B (49P)
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4. Check for continuity between these test points and body ground individually.
Test condition IG LOCK (0)
APP sensor 6P connector: disconnected
A/C pressure sensor 3P connector: disconnected
FTP sensor 3P connector: disconnected
Input shaft (mainshaft) speed sensor 3P connector: disconnected
PCM connector A (49P): disconnected
PCM connector B (49P): disconnected
Connector
Test circuit
Terminal
VCC6
No. 30 (RED)
PCM connector A (49P)
VCC5 No. 35 (LT GRN)
No. 29 (PNK)
PCM connector B (49P) VCC2
Fig. 274: Checking Continuity Between VCC6 No. 30 (RED) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig. 275: Checking Continuity Between VCC2 No. 29 (PNK) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : Repair a short in the VCC wire between the PCM (A30, A35, B29) and each part that was
disconnected in step 2, then do the repair verification .
NO : Update the PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE if it does
not have the latest software, or substitute a known-good PCM See PCM UPDATE or PCM
REMOVAL AND INSTALLATION , then do the repair verification .
REPAIR VERIFICATION
ο‘
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Reconnect all connectors.
3. Turn the ignition switch to ON (II).
4. Reset the PCM with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW
TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
ο‘
5. DO THE PCM IDLE LEARN PROCEDURE .
6. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P0651 SENSOR REFERENCE VOLTAGE B
MALFUNCTION
Is DTC P0651 indicated?
YES : Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1.
ο¬
ο¬
ο¬
ο¬
APP sensor
A/C pressure sensor
FTP sensor
Input shaft (mainshaft) speed sensor
NO : Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated
DTC's troubleshooting.
DTC P065A: ACG NO CHARGING MALFUNCTION
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