PASSED : 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.
FAILED : Go to step 1 and recheck. If the PCM was updated, substitute a known-good PCM See PCM
REMOVAL AND INSTALLATION or PCM UPDATE , then check the OBD STATUS again.
NOT COMPLETED : Meet the test condition, and check the OBD STATUS again.
DTC P0506: IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED
Fig. 246: DTC Troubleshooting Flow Chart (P0506)
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
P0506 IDLE CONTROL SYSTEM RPM LOWER THAN
EXPECTED
1. Problem verification:
ο‘
3. Turn the ignition switch to ON (II).
ο‘
2. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
ο‘
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 at least 20 seconds.
4. Check for these conditions in the DATA LIST with the HDS:
ο¬
ο¬
ο¬
ο¬
ο¬
ECT SENSOR 1 above 158 Β°F (70 Β°C)
IAT SENSOR above 32 Β°F (0 Β°C)
VEHICLE SPEED is 0 mph (0 km/h)
ST FUEL TRIM between 0.69 and 1.47
FSS is CLOSED
Current conditions
Signal
Values
Unit
ECT SENSOR 1
IAT SENSOR (2)
VEHICLE SPEED
AF FB (ST FUEL TRIM)
FSS
ο‘
5. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P0506 IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED
Does the HDS indicate FAILED?
YES : The failure is duplicated. Go to step 2.
NO : If the HDS indicates PASSED, go to step 1. If the HDS indicates EXECUTING, keep idling until a
result comes on. If the HDS indicates OUT OF CONDITION, meet the test condition and recheck.
2. Throttle body visual check:
ο‘
1. Remove the intake air duct from the throttle body See THROTTLE BODY
DISASSEMBLY AND REASSEMBLY , THROTTLE BODY REMOVAL AND
INSTALLATION or THROTTLE BODY CLEANING .
ο‘
2. Check for dirt, carbon, or damage in the throttle bore.
Is there dirt, carbon, or damage in the throttle bore?
YES : If there is dirt or carbon, clean the throttle body See THROTTLE BODY DISASSEMBLY
AND REASSEMBLY , THROTTLE BODY REMOVAL AND INSTALLATION or THROTTLE
BODY CLEANING . Also check for damage to the air cleaner element, 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 .
NO : The throttle body is OK. Check the A/C system, then go to step 4.
3. Throttle body visual check:
ο‘
1. Remove the intake air duct from the throttle body See THROTTLE BODY
DISASSEMBLY AND REASSEMBLY , THROTTLE BODY REMOVAL AND
INSTALLATION or THROTTLE BODY CLEANING .
ο‘
2. Check for dirt, carbon, or damage in the throttle bore.
Is there dirt, carbon, or damage in the throttle bore?
YES : 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 . Also check for damage to the air cleaner element, 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 .
NO : The throttle body is OK. Go to step 4.
4. Idle control system check:
ο‘
1. Turn the ignition switch to ON (II).
ο‘
2. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
ο‘
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 at least 20 seconds.
4. Check for these conditions in the DATA LIST with the HDS:
ο¬
ο¬
ο¬
ο¬
ο¬
ECT SENSOR 1 above 158 Β°F (70 Β°C)
IAT SENSOR above 32 Β°F (0 Β°C)
VEHICLE SPEED is 0 mph (0 km/h)
ST FUEL TRIM between 0.69 and 1.47
FSS is CLOSED
Current conditions
Signal
ECT SENSOR 1
IAT SENSOR (2)
VEHICLE SPEED
AF FB (ST FUEL TRIM)
FSS
Values
Unit
NOTE:
Recheck with different load conditions (turn on the headlights, the
blower motor, the rear window defogger, and/or the A/C, change the
gear position, etc.).
ο‘
5. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P0506 IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED
Does the HDS indicate PASSED?
YES : Intermittent failure, the system is OK at this time.
NO : If the HDS indicates FAILED, check the A/C system, then go to step 1 and recheck. If the HDS
indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION,
meet the test condition and recheck.
REPAIR VERIFICATION (OBD STATUS CHECK)
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. 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 at least 20 seconds.
ο‘
7. Check for these conditions in the DATA LIST with the HDS:
ο¬
ο¬
ο¬
ο¬
ο¬
ECT SENSOR 1 above 158 Β°F (70 Β°C)
IAT SENSOR above 32 Β°F (0 Β°C)
VEHICLE SPEED is 0 mph (0 km/h)
ST FUEL TRIM between 0.69 and 1.47
FSS is CLOSED
Current conditions
Signal
Values
Unit
ECT SENSOR 1
IAT SENSOR (2)
VEHICLE SPEED
AF FB (ST FUEL TRIM)
FSS
ο‘
8. Monitor the OBD STATUS for DTC P0506 in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P0506 IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED
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 idling until a result comes on.
OUT OF CONDITION : Meet the test condition, and check the OBD STATUS again.
DTC P0507: IDLE CONTROL SYSTEM RPM HIGHER THAN EXPECTED
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