DTC Description
OBD STATUS
P0507 IDLE CONTROL SYSTEM RPM HIGHER THAN EXPECTED
Does the HDS indicate PASSED, FAILED, EXECUTING, or OUT OF CONDITION?
PASSED : Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the
indicated DTC's troubleshooting.
FAILED : Go to step 1 and recheck.
EXECUTING : Keep the test condition until a result comes on.
OUT OF CONDITION : Meet the test condition, and check the OBD STATUS again.
DTC P050A: COLD START IDLE AIR CONTROL SYSTEM PERFORMANCE
PROBLEM
Fig. 248: DTC Troubleshooting Flow Chart (P050A)
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
P050A COLD START IDLE AIR CONTROL SYSTEM
PERFORMANCE PROBLEM
1. PGM-FI system check:
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1. Turn the ignition switch to ON (II).
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2. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame
Are any Pending or Confirmed DTCs other than P050A indicated?
YES : Go to the indicated DTC's troubleshooting.
NO : Go to step 2.
2. Intake air duct visual check:
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1. Check for a poor connection or blockage at the intake air duct.
Is it OK?
YES : Go to step 3.
NO : Reconnect or repair the intake air duct, then do the repair verification .
3. Air cleaner housing visual check:
ο‘
1. Check for a poor connection or blockage at the air cleaner housing.
Is it OK?
YES : Go to step 4.
NO : REPLACE THE AIR CLEANER HOUSING , then do the repair verification .
4. Air cleaner element visual check:
ο‘
1. Check for dirt or debris on the air cleaner element.
Is it dirty?
YES : REPLACE THE AIR CLEANER ELEMENT , then do the repair verification .
NO : Go to step 5.
5. Problem verification:
ο‘
1. Let the engine cool until the value of ECT SENSOR 1 is 122 Β°F (50 Β°C) or less.
Current conditions
Signal
Values
Unit
ECT SENSOR 1
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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, and let it idle for 10 seconds or more.
4. Monitor the OBD STATUS for DTC P050A with the HDS.
OBD
STATUS
DTC Description
P050A COLD START IDLE AIR CONTROL SYSTEM PERFORMANCE
PROBLEM
Does the HDS indicate FAILED?
YES : The failure is duplicated. Go to step 6.
NO : If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor
connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the PCM. If the HDS
indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION,
go to step 1. and recheck.
6. Throttle body test:
ο‘
1. Do the ETCS TEST with the HDS.
Is the THROTTLE ACTUATOR CONTROL VALVE normal?
YES : Go to step 7.
NO : Replace the throttle body See THROTTLE BODY DISASSEMBLY AND REASSEMBLY ,
THROTTLE BODY REMOVAL AND INSTALLATION or THROTTLE BODY CLEANING ,
then do the repair verification .
7. MAF sensor performance check:
ο‘
1. 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.
ο‘
2. While holding the engine speed at 2, 500 rpm for 30 seconds, check the parameter(s) below with
the HDS.
Signal
Threshold Current conditions
Values Unit Values Unit
MAF SENSOR 7.0-8.6 g/s
Do the current condition(s) match the threshold?
YES : The MAF sensor is OK. Go to step 8.
NO : REPLACE THE MAF SENSOR/IAT SENSOR , then do the repair verification .
8. IAT sensor performance check:
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ο‘
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1. Turn the ignition switch to LOCK (0).
2. Allow the engine to cool to ambient temperature.
3. Note the ambient temperature.
4. Turn the ignition switch to ON (II).
5. Quickly note the value of the IAT SENSOR in the DATA LIST with the HDS.
Current conditions
Signal
Values
Unit
IAT SENSOR
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6. Compare the value of the IAT SENSOR with the ambient temperature.
Does the value of the IAT SENSOR differ 5.4 Β°F (3 Β°C) or more from the ambient temperature?
YES : REPLACE THE MAF SENSOR/IAT SENSOR , then do the repair verification .
NO : The IAT sensor is OK. Check for dirt, carbon, or damage in the throttle bore. If there is dirt or
carbon, clean the throttle body See THROTTLE BODY DISASSEMBLY AND REASSEMBLY or
THROTTLE BODY REMOVAL AND INSTALLATION or THROTTLE BODY CLEANING ,
then do the repair verification . If there is damage in the throttle bore, replace the throttle body See
THROTTLE BODY DISASSEMBLY AND REASSEMBLY , THROTTLE BODY REMOVAL
AND INSTALLATION or THROTTLE BODY CLEANING , then do the repair verification .
REPAIR VERIFICATION (OBD STATUS CHECK)
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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 .
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6. Let the engine cool until the value of ECT SENSOR 1 is 122 Β°F (50 Β°C) or less.
Current conditions
Signal
Values
Unit
ECT SENSOR 1
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7. Start the engine, and let it idle for 10 seconds or more.
8. Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P050A COLD START IDLE AIR CONTROL SYSTEM 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 the test condition until a result comes on.
OUT OF CONDITION : Meet the test condition, and check the OBD STATUS again.
DTC P050B: COLD START IGNITION TIMING CONTROL SYSTEM
PERFORMANCE PROBLEM
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