Evap System

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

2003-04 ENGINE PERFORMANCE

EVAP System Pilot

COMPONENT LOCATION INDEX

DTC TROUBLESHOOTING

DTC INDEX

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

Table Caption: This table lists various Diagnostic Trouble Codes (DTCs) related to the Fuel Tank Pressure (FTP) sensor and the Evaporative Emission Control (EVAP) system, indicating potential issues with sensor performance, circuit voltage, or system leaks.

DTC PO451: FTP SENSOR RANGE/PERFORMANCE PROBLEM

Special Tools Required Vacuum Pump/Gauge, 0-30 inHg A973X-041-XXXXX

• 1 . Remove the fuel fill cap.

2. Turn the ignition switch ON (II).

• 3 . Monitor the FTP sensor voltage with the scan tool or the HDS;, or measure voltage between PCM connector terminals A29 and CI8.

PCM CONNECTORS

G01464236

Fig 2: Measuring Voltage Between PCM Connector Terminals_A29 C18 Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 2.5 V?

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

YES -Go to 4 step

NO -Replace the FTP sensor .

• 4 . Turn the ignition switch OFF
• Remove the EVAP canister cover see 1 on EVAP Canister Replacement step
• Disconnect the hose between the EVAP two way valve and the FTP sensor at the EVAP two way valve end.
• 7 Connect a vacuum pump to the open end of that hose.

G01464237

Fig 3; Connecting Vacuum Pump Courtesy of AMERICAN HONDA MOTOR CO., INC.

8. Turn the ignition switch ON (II).

NOTE: Do not apply too much vacuum or you will damage the FTP

sensor .

G01464238

Fig 4 Measuring Voltage_Between PCM Connector Terminals_A29 & C18 Courtesy of AMERICAN HONDA MOTOR CO., INC.

• 9 Monitor the FTP sensor voltage with the scan tool or the HDS , Or measure voltage between PCM connector terminals A29 and C18, and slowly squeeze the vacuum pump a little while watching the voltage.

10. The voltage should smoothly drop from about 2.5 V to about 1.5 V. applying vacuum when the voltage drops to about 1.5 V or damage to the FTP sensor may occur. Stop

Does the voltage drop to about 1.5 V and hold?

YES ~Substitute a known-good PCM and recheck see HOWTO SUBSTITUTE THE PCM FOR TESTING ) If the symptomlindication goes away, the original PCM replace

NO -Replace the FTP sensor .

DTC P0452: FTP SENSOR CIRCUIT LOW VOLTAGE

• 1 . Check for misrouted, poorly connected, damaged, or pinched vacuum lines at the FTP sensor .

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

PCM CONNECTORS

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

Are the vacuum lines OK?

YES -Go to 2. step

• NO -Repair or vacuum lines as necessary . replace
• 2 Reset the PCM (see HOWTO_RESET THE PCM
• 3 . Remove the fuel fill cap.

4. Turn the ignition switch ON (II).
5. Monitor the FTP sensor voltage with the scan tool or the HDS, or measure voltage between body ground and PCM connector terminal A29.

PCM CONNECTOR A (32P)

G01464239

Fig 5: Measuring Voltage Between Body Ground & PCM Connector Terminal A22

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 2.5 V?

YES -Intermittent failure; system is OK at this time. Check for poor connections or loose terminals at the FTP sensor and at the PCM.

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

NO-Go to 6. step

6. Turn the ignition switch OFF .
7. 7 Reinstall the fuel fill cap.
8. Disconnect the FTP sensor 3P connector .
9. 9 Turn the ignition switch ON (II) .
10. Measure voltage between FTP sensor 3P connector terminals No . 1 and No. 2.

FTP SENSOR 3F' CONNECTOR

Wire side of fernale terminals

G01464240

Fig_6; Measuring Voltage Between FTP Sensor 3P Connector Terminals No No 2

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Go to 11 . step

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

NO -Repair open in the wire between the FTP sensor and the PCM (C28)

• 11 . Measure voltage between FTP sensor 3P connector terminals No. 2 and No. 3.

FTP SENSOR 3P CONNECTOR

Wire sIde of female terminals

G01464241

No 3

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Replace the FTP sensor.

NO -Go to step 12.

12. Turn the ignition switch OFF .
13. 13 . Disconnect PCM connector A (32P).

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

14. Check for continuity between FTP sensor 3P connector terminal No. 3 and body ground.

FTP SENSOR 3P CONNECTOR

Wire side of female terminals G01464242

8: 3 & Body Ground Fig

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short in the wire between the FTP sensor and the PCM ( A29).

NO -Substitute a known-good PCM and recheck (see HOW TO SUBSTITUTE THE PCMFOR TESTING ) Ifnormal voltage is indicated, replace the original PCM

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

DTC P0453: FTP SENSOR CIRCUIT HIGH VOLTAGE

• 1 . Check for misrouted, poorly connected, damaged, or pinched vacuum lines at the FTP sensor .

Are the vacuum lines OK?

YES -Go to 2. step

NO -Repair or replace vacuum lines as necessary .

• 2 . Reset the PCM see HOW TORESET THE PCM
• 3 . Remove the fuel fill cap.

4. Turn the ignition switch ON (II).

• Monitor the FTP sensor voltage with the scan tool or the HDS , Or measure voltage between body ground and PCM connector terminal A29.

PCM CONNECTOR A (32P)

G01464243

Fig_9: Measuring Voltage_Between Body Ground & PCM Connector Terminal A22

Courtesy of AMERICAN HONDA MOTOR CO., INC.

2003 Honda Pilot LX

2003-04 ENGINE PERFORMANCE EVAP System Pilot

Is there about 2.5 V?

YES -Intermittent failure, is OK at this time. Check for poor comnections or loose terminals at the FTP sensor and at the PCM system

NO -Go to step 6.

• Turn the ignition switch OFF .
• Reinstall the fuel fill cap.