Fig. 380: DTC Troubleshooting Flow Chart (P2176)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
CAUTION: Do not insert your fingers into the installed throttle body when you turn
the ignition switch to ON (II), or while the ignition switch is in ON (II). If you
do, you will seriously injure your fingers if the throttle valve is activated.
NOTE:
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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 .
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If DTC P2135 is stored at the same time as DTC P2176, troubleshoot DTC
P2135 first, then recheck for DTC P2176.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P2176 THROTTLE ACTUATOR CONTROL SYSTEM IDLE
POSITION NOT LEARNED
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. Turn the ignition switch to LOCK (0).
4. Turn the ignition switch to ON (II), and wait 10 seconds.
5. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P2176 THROTTLE ACTUATOR CONTROL SYSTEM
IDLE POSITION NOT LEARNED
Is DTC P2176 indicated?
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 throttle body and the PCM, then clean the throttle body.
2. Throttle body operation check:
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1. Turn the ignition switch to LOCK (0).
2. Disconnect the intake air duct from the throttle body.
3. Turn the ignition switch to ON (II).
4. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE FUEL AND
EMISSIONS SYSTEMS or HOW TO TROUBLESHOOT THE A/T SYSTEM .
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5. Visually check the throttle valve operation while doing the ETCS TEST in the INSPECTION
MENU with the HDS.
Does the throttle valve move to its fully closed position?
YES : Go to step 3.
NO : Go to step 4.
3. Throttle body condition check:
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1. Turn the ignition switch to LOCK (0).
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2. Remove the throttle body See THROTTLE BODY DISASSEMBLY AND
REASSEMBLY , THROTTLE BODY REMOVAL AND INSTALLATION or THROTTLE
BODY CLEANING .
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3. Check for carbon build up on the throttle valve.
Is there carbon build up on the throttle valve?
YES : Clean the throttle body See THROTTLE BODY DISASSEMBLY AND REASSEMBLY ,
THROTTLE BODY REMOVAL AND INSTALLATION or THROTTLE BODY CLEANING ,
then do the repair verification .
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 .
4. Open wire check (MTR1 line, MTR2 line):
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1. Turn the ignition switch to LOCK (0).
2. Jump the SCS line with the HDS.
3. Disconnect the following connectors.
PCM connector C (49P)
Throttle body 6P connector
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4. Connect terminals A and B with a jumper wire.
Terminal A Throttle body 6P connector No. 1 (PNK)
Terminal B Throttle body 6P connector No. 2 (GRN)
Fig. 381: Connecting Wire Between Throttle Body 6P Connector No. 1 (PNK) And No. 2
(GRN)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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5. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
PCM connector C (49P): disconnected
Throttle body 6P connector: disconnected
Throttle body 6P connector No. 1 and No. 2: jumped
Test circuit MTR1, MTR2
Test point 1 PCM connector C (49P) No. 3 (GRN)
Test point 2 PCM connector C (49P) No. 4 (PNK)
Fig. 382: Checking Continuity Between PCM Connector C (49P) No. 3 (GRN) And No. 4
(PNK)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The MTR1 and MTR2 wires are OK. 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 : Repair an open in the MTR1 wire and/or the MTR2 wire between the PCM (C3, C4) and the throttle
body, then do the repair verification .
REPAIR VERIFICATION
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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 .
5. DO THE PCM IDLE LEARN PROCEDURE .
6. Turn the ignition switch to LOCK (0).
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7. Turn the ignition switch to ON (II), and wait 10 seconds.
8. Check for Pending or Confirmed DTCs with the HDS.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P2176 THROTTLE ACTUATOR CONTROL SYSTEM IDLE
POSITION NOT LEARNED
Is DTC P2176 indicated?
YES : Check for poor connections or loose terminals at the throttle body and the PCM, then clean the throttle
body See THROTTLE BODY REMOVAL AND INSTALLATION , THROTTLE BODY
DISASSEMBLY AND REASSEMBLY or THROTTLE BODY CLEANING , and go to step 1. If the PCM
was updated, substitute a known-good PCM See PCM UPDATE or PCM REMOVAL AND
INSTALLATION , 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
REMOVAL AND INSTALLATION or PCM UPDATE . If any other Pending or Confirmed DTCs are
indicated, go to the indicated DTC's troubleshooting.
DTC P2183: ECT SENSOR 2 CIRCUIT RANGE/PERFORMANCE PROBLEM
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