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FT
ON-BOARD DIAGNOSIS SYSTEM
Diagnostic trouble code
DTC P1460: WIDE OPEN THROTTLE N C CUT-OFF (WAC) RELAY
No. P1460, PI464
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DTC P1464: N C CONTROL SIGNAL (ACCS)
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Symptom
AIC was on, a WAC circu~t fault or ACCS Input to PCM was hlgh durlng self-test.
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INSPECTION
ACTION
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Note: Verify that N C and defrost were off during
Yes
Go to next step.
KOEOIKOER self-tests. If vehicle is not equipped with
AIC, WAC circuit is not used and DTC PI460 can be
ignored.
If Continuous Memory DTC PI460 is present,
go
directly to step 11.
Connect scan tool or NGS to data link connector.
No
Go to step 7.
Start englne.
Make sure A/C and defroster are turned off
Access ACCS PID
Is ACCS PID off7
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Key ON, englne off
Yes
Go to next step
D~sconnect WAC relay
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p
p
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Is voltage between VPWR clrcu~t at WAC relay co
on power dlstr~but~on box and chass~s ground gre
10
5
volts"
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Key OFF
Leave WAC relay dlsconnected.
Inspect WAC relay coll resfstance between plns 85 and 86
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at WAC relay (should be between 40 and 120 ohms).
No
Replace WAC relay
Inspect resistance between pin 85 and pin 30, 87 and 87A
Go to step 13
at WAC relay (should be greater than 10,000 ohms).
Are all reslstance checks OK7
Key OFF.
Leave WAC relay dlsconnected
Install breakout box, leave PCM d~sconnected
Key ON, englne off.
Is voltage between WAC test pln 69 at breakout box and
chass~s ground less than 1.0 volt7
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Key OFF
D~sconnect scan tool or NGS
Leave PCM and WAC relay d~sconnected
Measure reslstance between WAC test pln
69
and PWR
GND test pins 51/103 and SIG RTN test pin 91 at
breakout box
Is each resistance greater than 10,000 ohms7
Yes
Go to next step
No
Repair short to power.
Go to step 13.
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Yes
Go to next step.
No
Repair short clrcult.
Go to step 13.
Key OFF.
Leave PCM and WAC relay d~sconnected.
Is reslstance between WAC test pln 69 at breakout box
and WAC clrcult at relay connector on power d~str~but~on
box less than 5.0 ohms7
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Key OFF.
Disconnect A/C pressure switch.
Key ON, englne off.
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Access ACCS PID
Is ACCS PID off?
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Key OFF
D~sconnect WAC relay
Key ON, englne off
Is voltage between power-to-clutch c~rcult of WAC relay
connector on power dlstribut~on box and chass~s ground
less than 1 0 volt7
Yes
Replace PCM.
Go to step 13.
No
Repa~r open c~rcult
Go to step 13.
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Yes
lnspect operat~on of A/C sw~tch.
If OK, repair short to power In A/C sw~tch to
A/C pressure swltch c~rcuit.
Go to step 13.
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No
Go to next step.
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Yes
Go to next step.
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No
Repa~r short to power.
Go to step 13.
Key OFF
Yes
Go to next step
Leave WAC relay and A/C pressure sw~tch d~sconnected.
Install breakout box, leave PCM disconnected.
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Key ON, engine off
No
Repa~r ACCS clrcult short to power.
Is voltage between ACCS test pin 41 and PWR GND test
Go to step 13.
pins 511103 at breakout box less than 1 0 volt7
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Troubleshooting
