the engine idle.
Current conditions
Values Unit
Signal
EVAP PC DUTY
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7. Monitor the OBD STATUS for DTC P1454 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P1454 FTP SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM
Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?
PASSED : Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to the
indicated DTC's troubleshooting.
FAILED : Go to step 1 and recheck.
NOT COMPLETED : Hold the engine speed at 3, 000 rpm with the EVAP PC DUTY at 20% or more until a
result comes on.
DTC P1458: FTP SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM
Fig. 299: DTC Troubleshooting Flow Chart (P1458)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Special Tools Required
Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available
NOTE:
ο¬
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 .
ο¬
If any of DTCs listed below are indicated at the same time as DTC P1458,
troubleshoot those DTCs first, then recheck for P1458.
ο‘
P0451, P0452, P0453, P1454: FTP sensor
P2422: EVAP canister vent shut valve
ο‘
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Do not start the engine during this troubleshooting.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P1458 FTP SENSOR CIRCUIT RANGE/PERFORMANCE
PROBLEM
1. Fuel level check:
ο‘
1. Turn the ignition switch to ON (II).
2. Note these recorded on-board snapshot parameters with the HDS:
ο‘
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MAX Value of FTP SENSOR
MIN Value of FTP SENSOR
FUEL LEVEL
Fig. 300: FTP Sensor Signal Waveform
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
Check the FUEL LEVEL in the DATA LIST with the HDS.
Current conditions
Signal
Values
Unit
FUEL LEVEL
Is the FUEL LEVEL less than it is on the on-board snapshot?
YES : Go to step 2.
NO : Drain the fuel until the FUEL LEVEL is less than it is on the on-board snapshot, then go to step 2.
2. Determine possible failure area (FTP sensor, others):
ο‘
ο‘
1. Take a snapshot with the HDS for 3 minutes without starting the engine.
2. Check the recorded snapshot parameter with the HDS:
ο¬
MAX Value of FTP SENSOR (FINE)
MIN Value of FTP SENSOR (FINE)
ο¬
Fig. 301: FTP Sensor Signal Waveform (Fine)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is the difference between the MAX and MIN values of the FTP SENSOR (FINE) about 0.67 kPa (0.2
inHg, 5 mmHg) or less?
YES : Go to step 3.
NO : Go to step 5.
3. FTP sensor performance check 1:
ο‘
1. Check the FTP SENSOR (FINE) in the recorded snapshot with the HDS.
Does it vary 0.067 kPa (0.2 inHg, 5 mmHg) or more for 3 seconds?
YES : Go to step 4.
NO : Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at
the FTP sensor, the EVAP canister vent shut valve, and the PCM. Also check for a blockage in the EVAP
vent hose.
4. FTP sensor performance check 2:
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1. Turn the ignition switch to LOCK (0).
2. REMOVE THE FTP SENSOR .
3. Reconnect the FTP sensor 3P connector.
4. Turn the ignition switch to ON (II).
5. Check the parameter(s) below with the HDS.
Current conditions
Signal
Values
Unit
FTP SENSOR (FINE)
Does it vary 0.067 kPa (0.2 inHg, 5 mmHg) or more for 3 seconds?
YES : REPLACE THE FTP SENSOR , then do the repair verification .
NO : Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at
the FTP sensor, the EVAP canister vent shut valve, and the PCM. Also check for a blockage in the EVAP
vent hose.
5. Determine possible failure area (EVAP canister vent line, others):
ο‘
1. Remove the fuel fill cap.
ο‘
2. Check the parameter(s) below with the HDS.
Threshold
Values
Current conditions
Unit Values Unit
Signal
More than 0.67 kPa
Less than -0.67 kPa
FTP SENSOR (FINE)
Do the current condition(s) match the threshold?
YES : Reinstall the fuel fill cap, then go to step 8.
NO : Go to step 6.
6. FTP sensor vent hose check:
ο‘
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1. Turn the ignition switch to LOCK (0).
2. REMOVE THE FTP SENSOR .
3. Reconnect the FTP sensor 3P connector.
4. Turn the ignition switch to ON (II).
5. Check the parameter(s) below with the HDS.
Threshold
Values
Current conditions
Unit Values Unit
Signal
More than 0.67 kPa
less than - 0.67 kPa
FTP SENSOR (FINE)
Do the current condition(s) match the threshold?
YES : Remove the blockage in the FTP sensor vent hose. Replace the hose if needed.
NO : Go to step 7.
7. FTP sensor port visual check:
ο‘
1. Turn the ignition switch to LOCK (0).
2. Disconnect the following connector.
ο‘
FTP sensor 3P connector
ο‘
3. Check for a blockage or damage at the FTP sensor ports (EVAP canister side and vent side).
Fig. 302: Identifying FTP Sensor Ports
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there any blockage or damage?
YES : Remove the blockage, and REPLACE THE FTP SENSOR if needed, then do the repair
verification .
NO : REPLACE THE FTP SENSOR , then do the repair verification .
8. EVAP canister vent shut valve check:
ο‘
1. Turn the ignition switch to LOCK (0).
ο‘
2. Disconnect the fresh air hose (A) from the EVAP canister (B), then connect a vacuum
pump/gauge, 0-30 inHg, to the EVAP vent shut valve as shown.
Fig. 303: Identifying EVAP Canister And Air Hose
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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3. Turn the ignition switch to ON (II).
4. Try to apply vacuum to the valve (not more than 5.3 kPa (1.6 inHg, 40 mmHg)) while checking
the FTP SENSOR (FINE) in the DATA LIST with the HDS.
NOTE:
To avoid damaging the FTP sensor, do not apply more than 5.3 kPa
(1.6 inHg, 40 mmHg) of vacuum.
Current conditions
Signal
FTP SENSOR (FINE)
Values
Unit
Does the valve hold more than 1.3 kPa (0.4 inHg, 10 mmHg) of vacuum?
YES : REPLACE THE EVAP CANISTER VENT SHUT VALVE , then do the repair verification .
NO : The EVAP canister vent shut valve is OK. Remove the blockage in the fresh air hose. Replace the
hose if needed, 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 and the fresh air hose.
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‘
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5. DO THE PCM IDLE LEARN PROCEDURE .
6. Take a snapshot with the HDS for 3 minutes without starting the engine.
7. Check the recorded snapshot parameter with the HDS:
ο¬
MAX Value of FTP SENSOR (FINE)
MIN Value of FTP SENSOR (FINE)
ο¬
Fig. 304: FTP Sensor Signal Waveform (Fine)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is the difference between the MAX and MIN values of the FTP SENSOR (FINE) about 0.67 kPa (0.2 inHg, 5
mmHg) or less?
YES : Troubleshooting is complete.
NO : Check for poor connections or loose terminals at the FTP sensor, the EVAP canister vent shut valve, and
the PCM, then go to step 1.
DTC P145C: EVAP SYSTEM PURGE FLOW MALFUNCTION
Fig. 305: DTC Troubleshooting Flow Chart (P145C)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
NOTE:
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Before you troubleshoot, record all freeze data and any on-board
2024 Honda CR-V Owner's Manual
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