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DTC Troubleshooting
DTC P0451: FTP Sensor Range/Performance
Problem
Special Tools Required
Vacuum Pump/Gauge, 0 - 3 0 in. Hg A973X-041-XXXXX
1. Remove the fuel fill cap.
2. Turn the ignition switch ON (II).
3. Monitor FTP sensor voltage with the Honda PGM
Tester, or measure voltage between ECM/PCM
connector terminals A29 and C18.
E C M / P C M C O N N E C T O R S
/
2
3
4
5
6
/
8
9
10
12 13 14 15
/
17 18 19 20 21
/
2 3
24
25 2 6 27
28 29 30
/
3 2
P T A N K ( L T G R N )
1 2
3
/
5
6
7
8
9 10
/
/
1 3 14 15 16 17 18 19 20 21
/
2 3 2 4 2 5
2 6 27 2 3
2 9 30
/
S G 2 ( G R N / B L K )
W i r e s i d e o f f e m a l e t e r m i n a l s
Is there approx. 2.5 V?
Y E S - G o to step 4.
NO —Replace the FTP s e n s o r . B
4. Turn the ignition switch OFF.
5. Open the fuel vent assembly cover (A) in front of
the EVAP canister.
6. 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.
A 9 7 3 X -
0 4 1 - X X X X X
8. Turn the ignition switch ON (II).
9. Monitor FTP sensor voltage with the Honda PGM
Tester, or measure voltage between PCM connector
terminals A29 and C18, and carefully squeeze the
vacuum pump slowly.
E C M / P C M C O N N E C T O R S
/
2
3
4
5
6
/
8
9
10
12 13 14 15
/
17 18 19 20 21
/
2 3
24
25 2 6 2 7
2 8 29 30
/
3 2
P T A N K ( L T G R N )
1
2
3
/
5
6
7
8
9
10
/ /
13 14 15 16 17 18 19 20 21
/
2 3 24 2 5
26 2 7 2 3
29 30
/
W i r e s i d e o f f e m a l e t e r m i n a l s
S G 2 ( G R N / B L K )
10. The voltage should smoothly drop from approx.
2.5 V down to approx. 1.5 V. STOP applying
vacuum when the voltage drops to approx. 1.5 V or
damage to the FTP sensor may occur.
Does the voltage
drop to approx.
1.5 V and
hold?
Y E S —Check for misrouted, leaking, or broken FTP
sensor vacuum lines. If the vacuum lines are OK,
substitute a known-good ECM/PCM and recheck
(see page 11-5). If the symptom/indication goes away,
replace the original ECM/PCM. B
NO —Replace the FTP sensor. B
11-145
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Troubleshooting
