Idle Control System: Diagnosis Honda CR-V II

DTC Troubleshooting

DTC INDEX

Note. If DTC P1519 is stored at the same time as DTC P0505, troubleshoot DTC P1519 first, then recheck for DTC P0505.

Scheme 266

1. Start the engine. Hold the engine at 3,000 RPM with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
2. Check the engine speed at idle with no-load conditions: headlights, blower fan, rear window defogger, radiator fan, and air conditioner off. Is the engine running at 650+/-50 RPM? YES - Intermittent failure, system is OK at this time. NO - If the idle speed is less than 600 RPM, go to step 3; if it's 700 RPM or higher, go to step 4 .
3. Disconnect the idle air control (IAC) valve 3P connector. Does the engine speed increase or fluctuate? YES - Check the idle speed (see «Idle Speed Inspection»(ref-171388-S18849245432005020300000) ). If the idle will not adjust properly, clean the passage in the throttle body, and then adjust the idle. NO - Replace the IAC valve.
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. Put your fingers on the lower port (A) in the throttle body. Does the engine stall? YES - Check the idle speed (see «Idle Speed Inspection»(ref-171388-S18849245432005020300000) ). If it's out of specification, replace the IAC valve. NO - Check for vacuum leaks. Make sure the throttle valve is completely closed, and repair as necessary.

Note. If DTC P0511 is stored at the same time as DTC P0506, troubleshoot DTC P0511 first, then recheck for DTC P0506.

1. Start the engine. Hold the engine at 3,000 RPM with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
2. Check the engine speed at idle with no-load conditions: headlights, blower fan, rear window defogger, radiator fan, and air conditioner off. Is the engine running at 650+/-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 idle air control (IAC) valve 3P connector.
5. Start the engine, and let it idle.
6. Check the engine speed at idle with no-load conditions: headlights, blower fan, rear window defogger, radiator fan, and air conditioner off. Does the engine speed increase or fluctuate? YES - Check the idle speed with a different load condition (electrical, A/C, gear position, P/S, etc.) (see «Idle Speed Inspection»(ref-171388-S18849245432005020300000) ). If it's out of specification, replace the IAC valve (see «THROTTLE BODY DISASSEMBLY/REASSEMBLY»(ref-171389-S03058078252005020300000) ). NO - Replace the IAC valve (see «THROTTLE BODY DISASSEMBLY/REASSEMBLY»(ref-171389-S03058078252005020300000) ).

Note. If DTC P0511 is stored at the same time as DTC P0507, troubleshoot DTC P0511 first, then recheck for DTC P0507.

Scheme 267

1. Start the engine. Hold the engine at 3,000 RPM with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
2. Check the engine speed at idle with no-load conditions: headlights, blower fan, rear window defogger, radiator fan, and air conditioner off. Is the engine running at 650+/-50 RPM? YES - Intermittent failure, system is OK at this time. NO - Go to step 3.
3. Turn the ignition switch OFF.
4. Remove 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. Does the engine speed drop below 700 RPM? YES - Check the idle speed with a different load condition (electrical, A/C, gear position, P/S, etc.) (see «Idle Speed Inspection»(ref-171388-S18849245432005020300000) ). If it's out of specification, replace the IAC valve (see «THROTTLE BODY DISASSEMBLY/REASSEMBLY»(ref-171389-S03058078252005020300000) ). NO - Check for vacuum leaks following parts. PCV valve PCV hose EVAP canister purge valve Intake manifold Throttle body Brake booster hose

Idle Speed Inspection

Note. Leave the idle air control (IAC) valve connected. Before checking the idle speed, check these items: The malfunction indicator lamp (MIL) has not been reported on. There are no vacuum leaks Ignition timing Throttle cable adjustment Spark plugs Air cleaner PCV system Pull the parking brake lever up. Start the engine, and make sure the headlights are off.

Scheme 268

Scheme 269

Scheme 270

Scheme 271

1. Disconnect the evaporative emission (EVAP) canister purge valve 2P connector.
2. Connect a tachometer (A) to the test tachometer connector (B), or connect the HDS or a scan tool to the data link connector (DLC) (C) located under the driver's side of the dashboard.
3. Start the engine. Hold the engine at 3,000 RPM with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Check the idle speed with no-load conditions: headlights, blower fan, radiator fan, and air conditioner off. Idle speed should be
5. Let the engine idle for 1 minute with the heater fan switch on HI and air conditioner on, then check the idle speed. Idle speed should be: NOTE: If the idle speed is not within specification, go to the Symptom Troubleshooting.
6. Reconnect the EVAP canister purge valve 2P connector.