Fig. 362: DTC Troubleshooting Flow Chart (P2127)
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 FUEL AND EMISSIONS SYSTEMS or HOW TO TROUBLESHOOT THE A/T
SYSTEM .
DTC Description
Confirmed DTC Pending DTC Freeze Frame
P2127 APP SENSOR B CIRCUIT LOW VOLTAGE
1. Problem verification:
ο‘
ο‘
1. Turn the ignition switch to ON (II).
2. Check the parameter(s) below with the HDS.
Threshold
Values Unit Values
Current conditions
Signal
Unit
APP SENSOR B Less than 0.2 V
Do the current condition(s) match the threshold?
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 APP sensor and the PCM.
2. Determine possible failure area (VCC5 line, others):
ο‘
1. Turn the ignition switch to LOCK (0).
2. Disconnect the following connector.
ο‘
APP sensor 6P connector
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ο‘
3. Turn the ignition switch to ON (II).
4. Measure the voltage between test points 1 and 2.
Test condition IG ON(II)
APP sensor 6P connector: disconnected
Test circuit VCC5, SG5
Test point 1 APP sensor 6P connector No. 1 (LT GRN)
Test point 2 APP sensor 6P connector No. 2 (YEL)
Fig. 363: Measuring Voltage Between APP Sensor 6P Connector No. 1 (LT GRN) And No. 2
(YEL)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there about 5.0 V?
YES : Go to step 3.
NO : Go to step 6.
3. Shorted wire check (APS2 line):
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Jump the SCS line with the HDS.
3. Disconnect the following connector.
PCM connector A (49P)
ο‘
4. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
APP sensor 6P connector: disconnected
PCM connector A (49P): disconnected
Test circuit APS2
Test point 1 APP sensor 6P connector No. 3 (PUR)
Test point 2 Body ground
Fig. 364: Checking Continuity Between APP Sensor 6P Connector No. 3 (PUR) And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : Repair a short in the APS2 wire between the PCM (A29) and the APP sensor, then do the repair
verification .
NO : The APS2 wire is not shorted. Go to step 4.
4. Open wire check (APS2 line):
ο‘
1. Connect terminals A and B with a jumper wire.
Terminal A APP sensor 6P connector No. 3 (PUR)
Terminal B Body ground
Fig. 365: Connecting Wire Between APP Sensor 6P Connector No. 3 (PUR) And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
2. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
APP sensor 6P connector: disconnected
APP sensor 6P connector No. 3: jumped to body ground
PCM connector A (49P): disconnected
Test circuit APS2
Test point 1 PCM connector A (49P) No. 29 (PUR)
Test point 2 Body ground
Fig. 366: Checking Continuity Between PCM Connector A (49P) No. 29 (PUR) And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The APS2 wire is OK. Go to step 5.
NO : Repair an open in the APS2 wire between the PCM (A29) and the APP sensor, then do the repair
verification .
5. PCM internal circuit check:
ο‘
1. Reconnect the following connector.
PCM connector A (49P)
ο‘
2. Connect terminals A and B with a jumper wire.
Terminal A APP sensor 6P connector No. 1 (LT GRN)
Terminal B APP sensor 6P connector No. 3 (PUR)
Fig. 367: Connecting Wire Between APP Sensor 6P Connector No. 1 (LT GRN) And No. 3
(PUR)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
ο‘
3. Turn the ignition switch to ON (II).
4. Check the parameter(s) below with the HDS.
Threshold
Values Unit Values
APP SENSOR B Less than 0.2 V
Current conditions
Signal
Unit
Do the current condition(s) match the threshold?
YES : 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 REMOVAL AND
INSTALLATION or PCM UPDATE , then do the repair verification .
NO : REPLACE THE APP SENSOR , then do the repair verification .
6. Open wire check (VCC5 line):
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Jump the SCS line with the HDS.
3. Disconnect the following connector.
PCM connector A (49P)
ο‘
4. Connect terminals A and B with a jumper wire.
Terminal A APP sensor 6P connector No. 1 (LT GRN)
Terminal B Body ground
Fig. 368: Connecting Wire Between APP Sensor 6P Connector No. 1 (LT GRN) And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
5. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
APP sensor 6P connector: disconnected
APP sensor 6P connector No. 1: jumped to body ground
PCM connector A (49P): disconnected
Test circuit VCC5
Test point 1 PCM connector A (49P) No. 35 (LT GRN)
Test point 2 Body ground
Fig. 369: Checking Continuity Between PCM Connector A (49P) No. 35 (LT GRN) And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The VCC5 wire is OK. Update the PCM See PCM UPDATE or PCM REMOVAL AND
INSTALLATION 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 .
NO : Repair an open in the VCC5 wire between the PCM (A35) and the APP sensor, then do the repair
verification .
REPAIR VERIFICATION
ο‘
ο‘
ο‘
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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 FUEL AND EMISSIONS
SYSTEMS or HOW TO TROUBLESHOOT THE A/T SYSTEM .
ο‘
ο‘
5. DO THE PCM IDLE LEARN PROCEDURE .
6. Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC Pending DTC Freeze Frame
P2127 APP SENSOR B CIRCUIT LOW VOLTAGE
Is DTC P2127 indicated?
YES : Check for poor connections or loose terminals at the APP Sensor and the PCM. If the PCM was updated,
substitute a known-good PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE , then
recheck. If the PCM was substituted, go to step 1.
NO : Troubleshooting is complete. If the PCM was substituted, replace the original PCM See PCM UPDATE
or PCM REMOVAL AND INSTALLATION . If any other Pending or Confirmed DTCs are indicated, go to
the indicated DTC's troubleshooting.
DTC P2128: APP SENSOR B (TP SENSOR E) CIRCUIT HIGH VOLTAGE
Fig. 370: DTC Troubleshooting Flow Chart (P2128)
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 .
DTC Description
Confirmed DTC Pending DTC Freeze Frame
P2128 APP SENSOR B CIRCUIT HIGH VOLTAGE
1. Problem verification:
ο‘
ο‘
1. Turn the ignition switch to ON (II).
2. Check the parameter(s) below with the HDS.
Threshold
Values
Current conditions
Unit Values Unit
Signal
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