Tech Tip: Diagnosing and Repairing Honda When MIL Comes On – UnderhoodService

Tech Tip: Diagnosing and Repairing Honda When MIL Comes On

The MIL comes on with one or more of these evaporative DTCs stored: P0451 (FTP sensor circuit range/performance problem); P0452 (FTP sensor circuit low voltage); P0453 (FTP sensor circuit high voltage); P1454 (FTP sensor circuit range/performance problem).

Applies to: All 2002-’04 Honda CR-V

The MIL comes on with one or more of these evaporative DTCs stored: P0451 (FTP sensor circuit range/performance problem); P0452 (FTP sensor circuit low voltage); P0453 (FTP sensor circuit high voltage); P1454 (FTP sensor circuit range/performance problem).

Diagnosis:

The FTP (fuel tank pressure) sensor has an internal malfunction. Replace the fuel tank pressure sensor.

1. Connect the HDS to the DLC (data link connector).figure 1

2. Remove the fuel fill cap.

3. Turn the ignition switch to the On (II) position.

4. Select the PGM-FI data list, and observe the fuel tank pressure sensor voltage.
• If the FTP sensor voltage is between 2.46V and 2.56V, run the evaporative function test and follow normal troubleshooting. This service bulletin does not apply:
• If the FTP sensor voltage is not between 2.46V and 2.56V, go to Repair Procedure.

Repair Procedure:

1. Remove the EVAP canister.
• Refer to page 11-217 of the 2002-’04 CR-V service manual, or
• Online, enter keyword EVAP, then select EVAP Canister Replacement from the list.

2. Remove the three EVAP canister bracket bolts and lower the EVAP canister bracket. See Fig. 1.

3. Remove the EVAP two-way valve and the fuel tank pressure sensor vacuum hoses. Then remove only the EVAP two-way valve.

4. Install the EVAP two-way valve onto the new canister bracket. See Fig. 2.Figure 2

5. Install the remaining parts in the reverse order of removal.

Courtesy of IDENTIFIX.

You May Also Like

Diagnosing Intercooler Boost Trouble Code P0299

The criteria for setting the code is very basic.

A code P0299 for lower- than-normal boost can be one of the most challenging DTCs to resolve. You might think it is a code for a leak, but it could be more than a leak. The criteria for setting the code is very basic. The engine management system is looking at the desired boost pressure and the actual boost pressure, if the actual and desired do not match for the conditions. 

Honda Electronic Throttle Body Service Tips

Using care and following OEM procedures will help you to avoid unnecessary parts replacement and comebacks.

Why Alternators Are Subject To Ripple Voltage

The alternator produces an AC current that must be converted into DC current by way of a rectifier.

Belts and Pulley Alignment

A misalignment of the plane of the belt can occur when a pulley is not parallel to the other pulleys on the belt drive system.

Diagnosing Misfires

What if there are no codes and a misfire is intermittent? This is where it gets complicated.

Other Posts

Lifter Deactivation

The area of contact between the lifters and cam lobes is the highest loaded surface inside an engine.

Alternator Testing For No Charge Conditions

Many alternator problems turn out to be nothing more than a bad connection at the alternator or a bad wiring harness.

Understanding Coolants

All-season coolant used inorganic acid technology and worked great for almost 30 years.

Ignition System Do’s and Don’ts

Why do ignition systems give technicians problems when diagnosing ignition-related misfires? The answer is that some technicians use tests that might give inconclusive results or do damage to the coil or drivers inside a module.