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Idle Control System: Diagnosis Honda Insight ZE1

Testing & Diagnostics 2 illustrations ~682 words

DTC Troubleshooting

DTCDescription
DTC P0505Idle Control System Malfunction (2000-2003 models)
DTC P0506Idle Control System RPM Lower Than Expected (2004-2006 models)
DTC P0507Idle Control System RPM Higher Than Expected (2004-2006 models)
DTC P0511IAC Valve Circuit Malfunction (2004-2006 models)
DTC P1519IAC Valve Circuit Malfunction (2000-2003 models)

DTC INDEX

Note. If DTC P1519 is stored at the same time as DTC P0505, troubleshoot DTC P1519 first, then recheck for DTC P0505. Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 262

Scheme 262: DTC P0505: Idle Control System Malfunction (2000-2003 models)
Scheme 262: DTC P0505: Idle Control System Malfunction (2000-2003 models)
  1. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  2. Check the engine speed at idle without load condition: headlights, blower fan, rear defogger, radiator fan, and air conditioner off. Is the idle speed 900+/- 50 RPM? YES -Intermittent failure, system is OK at this time. NO -If the idle speed is less than 850 RPM, go to step 3; if it's 950 RPM or higher, go to step 4 .
  3. Disconnect the IAC valve 3P connector. Does the engine speed increase or fluctuate? YES -Check the idle speed under different load conditions (electrical, A/C, gear position, P/S, etc.) (see «IDLE SPEED ADJUSTMENT»(ref-219290-S35984243902006021300000) ). If it's out of specification, clean the ports in the throttle body. NO -Replace the IAC valve (see «THROTTLE BODY DISASSEMBLY/REASSEMBLY»(ref-219292-S13434681672006021300000) ).
  4. Turn the ignition switch OFF.
  5. Remove the intake air duct from the throttle body.
  6. Start the engine, and let it idle.
  7. Block both the round bypass port (A) and the rectangular IAC port (B) in the throttle body with your fingers. Does the engine stall? YES -Check the idle speed under different load conditions (electrical, A/C, gear position, P/S, etc.) (see «IDLE SPEED ADJUSTMENT»(ref-219290-S35984243902006021300000) ). If it's out of specification, replace the IAC valve. NO -Check for vacuum leaks at these parts: PCV valve PCV hose EVAP canister purge valve Intake manifold Throttle body Brake booster hose

Note. If DTC P0511 is stored at the same time as DTC P0506, troubleshoot DTC P0511 first, then recheck for DTC P0506. Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

  1. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  2. Check the engine speed at idle without load condition: headlights, blower fan, rear defogger, and air conditioner off. Is the engine running at 900+/- 50 RPM? YES -Intermittent failure, system is OK at this time. NO -Go to step 3.
  3. Turn the ignition switch OFF.
  4. Disconnect the IAC valve 3P connector.
  5. Start the engine, and let it idle.
  6. Check the engine speed at idle without load condition: headlights, blower fan, rear defogger, and air conditioner off. Does the engine speed increase or fluctuate? YES -Check the idle speed under different load conditions (electrical, A/C, gear position, P/S, etc.) (see «IDLE SPEED ADJUSTMENT»(ref-219290-S35984243902006021300000) ). If it's out of specification, clean the ports in the throttle body. NO -Replace the IAC valve (see «THROTTLE BODY DISASSEMBLY/REASSEMBLY»(ref-219292-S13434681672006021300000) ).

Note. If DTC P0511 is stored at the same time as DTC P0507, troubleshoot DTC P0511 first, then recheck for DTC P0507. Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 263

Scheme 263: DTC P0507: Idle Control System RPM Higher Than Expected (2004-2006 models)
Scheme 263: DTC P0507: Idle Control System RPM Higher Than Expected (2004-2006 models)
  1. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  2. Check the engine speed at idle without load condition: headlights, blower fan, rear defogger, and air conditioner off. Is the engine running at 900+/- 50 RPM? YES -Intermittent failure, system is OK at this time. NO -Go to step 3.
  3. Turn the ignition switch OFF.
  4. Disconnect the intake air duct from the throttle body.
  5. Start the engine, and let it idle.
  6. Put your fingers on the lower port (A) in the throttle body (B). Does the engine speed drop below 900 RPM? YES -Check the idle speed under different load conditions (electrical, A/C, gear position, P/S, etc.) (see «IDLE SPEED ADJUSTMENT»(ref-219290-S35984243902006021300000) ). If it's out of specification, replace the IAC valve. NO -Check for vacuum leaks at these parts: PCV valve PCV hose EVAP canister purge valve Intake manifold Throttle body Brake booster hose

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