Fig. 419: DTC Troubleshooting Flow Chart (P2A00)
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
P2A00 A/F SENSOR (SENSOR 1) CIRCUIT
RANGE/PERFORMANCE PROBLEM
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 A/T SYSTEM or
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
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3. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator
fan comes on, then let it idle.
4. Test-drive under these conditions:
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Engine coolant temperature (ECT SENSOR 1) above 158 Β°F (70 Β°C)
Transmission in D
Vehicle speed between 25-55 mph (40-90 km/h) for 5 minutes
Drive at a steady speed between 55-75 mph (88- 120 km/h) for 10 seconds, then decelerate
(with throttle fully closed) for at least 4 seconds
Current conditions
Signal
Values
Unit
ECT SENSOR 1
ENGINE SPEED
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5. Monitor the OBD STATUS for DTC P2A00 with the HDS.
OBD
Status
DTC Description
P2A00 A/F SENSOR (SENSOR 1) CIRCUIT RANGE/PERFORMANCE
PROBLEM
Does the HDS indicate FAILED?
YES : REPLACE THE A/F SENSOR (SENSOR 1) , then do the repair verification .
NO : If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor
connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the HDS indicates
EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to
step 1-3 and recheck.
REPAIR VERIFICATION (OBD STATUS CHECK)
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1. Turn the ignition switch to ON (II).
2. 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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3. DO THE PCM IDLE LEARN PROCEDURE .
4. Test-drive under these conditions:
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Engine coolant temperature (ECT SENSOR 1) above 158 Β°F (70 Β°C)
Transmission in D
Vehicle speed between 25-55 mph (40-90 km/h) for 5 minutes
Drive at a steady speed between 55-75 mph (88- 120 km/h) for 10 seconds, then decelerate (with
throttle fully closed) for at least 4 seconds
Current conditions
Signal
Values
Unit
ECT SENSOR 1
ENGINE SPEED
ο‘
5. Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS.
DTC Description
OBD Status
P2A00 A/F SENSOR (SENSOR 1) CIRCUIT RANGE/PERFORMANCE PROBLEM
Does the HDS indicate PASSED, FAILED, EXECUTING, or OUT OF CONDITION?
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.
EXECUTING : Keep driving until a result comes on.
OUT OF CONDITION : Meet the test condition, and check the OBD STATUS again.
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