code 1298
po478
po476 epc its unplugged
p1111
they said it has a miss at idle on a couple cylinders.

 

Some reading here...Part one<TABLE cellSpacing=0 width="95%"><TBODY><TR><TD>V: Cylinder Identification (CID)
</TD><TD align=right width="25%">[img]file:///C:/TSO/tsocache/OFFICE_2772/VVC~us~en~file=arrowbak.gif~gen~ref.gif[/img] V: Introduction </TD></TR></TBODY></TABLE>

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V1 DIAGNOSTIC TROUBLE CODES (DTCs) P1663

• DTC P1663 indicated that the PCM has detected a failure on the CID line.
• Possible causes:
  • Open/short in CID circuit
  • IDM
  • PCM
• Check for other codes.
• Key on, engine off.
• Perform KOEO On-Demand Self Test and Retrieve Continuous DTCs.

Was only DTC P1667 present?


<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">If DTC P1667 was present, GO to V2 . </TD><TD width="50%">If DTCs P1663 and P1667 are set together, with or without DTC P1668, GO to U6 . If DTC P1298 is also present, REPLACE the IDM. If DTC P1662 is also present, GO to W1 .

</TD></TR></TBODY></TABLE>

V2 CHECK VOLTAGE ON CID CIRCUIT 817 (Y/LB)

• Install breakout box, connect PCM to breakout box.
• Key on, engine off.
• Measure voltage on Circuit 817 (Y/LB) between PCM Test Pin 96 and ground Pins 25, 51, 76, 77, 91 and 103.

Is voltage 0.6 ± 0.1 volt present?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">GO to V3 . </TD><TD width="50%">Voltage of less than 0.5 present, GO to V4 . Above 4.0 volts is present, GO to V5 .

</TD></TR></TBODY></TABLE>

V3 PERFORM AN OUTPUT STATE CHECK

• Key on, engine off.
• Perform KOEO Output State Self-Test, toggle outputs by pressing and releasing the accelerator pedal.
• Measure voltage between PCM Test Pin 96 and ground Pins 25, 51, 76, 77, 91 and 103.

Did the output voltage toggle from 0.6 ± 0.1 volt to B+ volts?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">Intermittent, GO to V8 . </TD><TD width="50%">REPLACE the PCM. RESTORE vehicle. CLEAR DTCs and RETEST. </TD></TR></TBODY></TABLE>

V4 CHECK FOR OPEN ON CID CIRCUIT 817 (Y/LB)

• Key off.
• Disconnect the PCM from breakout box.
• Disconnect the IDM connector.
• Measure resistance on Circuit 817 (Y/LB) between PCM Test Pin 96 and Pin 16 on the IDM harness connector.

Is resistance less than 5 ohms?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">GO to V6 . </TD><TD width="50%">REPAIR open in Circuit 817 (Y/LB). RESTORE vehicle. CLEAR DTCs and RETEST. </TD></TR></TBODY></TABLE>

V5 CHECK CID CIRCUIT 817 (Y/LB) FOR SHORT TO POWER

• PCM disconnected.
• Key on, engine off.
• Measure voltage on Circuit 817 (Y/LB) between PCM Test Pin 96 and ground Pins 25, 51, 76, 77, 91 and 103.

Is voltage present?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">REPAIR short to power on Circuit 817 (Y/LB). RESTORE vehicle. CLEAR DTCs and RETEST. </TD><TD width="50%">GO to V7 . </TD></TR></TBODY></TABLE>

V6 CHECK CID CIRCUIT 817 (Y/LB) FOR SHORT TO GROUND

• Key off.
• Measure resistance between PCM test Pin 96 and ground Pins 25, 51, 76, 77, 91 and 103.

Is resistance greater than 10,000 ohms?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">GO to V7 . </TD><TD width="50%">REPAIR ground short on Circuit 817 (Y/LB). RESTORE vehicle. CLEAR DTCs and RETEST. </TD></TR></TBODY></TABLE>

V7 CHECK PCM OUTPUT STATE FUNCTION

• Key off.
• Connect PCM to breakout box.
• Perform KOEO Output State Test.
• Measure voltage between PCM Test Pin 96 and ground Pins 25, 51, 76, 77, 91 and 103 while pressing and releasing accelerator pedal.

Did the output voltage toggle from 0.5 ± 0.1 volt to 0.0?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">REPLACE IDM. RESTORE vehicle. CLEAR DTCs and RETEST. </TD><TD width="50%">REPLACE PCM. RESTORE vehicle. CLEAR DTCs and RETEST. </TD></TR></TBODY></TABLE>

V8 INTERMITTENT

• Key off.
• Restore vehicle.
• Clear DTCs.
• Turn key off, then turn key on.
• Perform KOEO On-Demand Self Test.

Did DTC P1663 reset?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">REPLACE the PCM. RESTORE vehicle. CLEAR DTCs and RETEST </TD><TD width="50%">Unable to duplicate failure. RESTORE vehicle. CLEAR DTCs and RETEST. </TD></TR></TBODY></TABLE>

V9 DIAGNOSTIC TROUBLE CODE (DTC) P1218

• Key on, engine off.
• Perform KOEO On-Demand Self Test.

Was DTC P1218 present?


<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">If DTC P1218 was present without P1667, GO to V10 . </TD><TD width="50%">If DTCs P1663, P1667 and P1668 are also present with DTC P1218, GO to U6 .

If DTC P1667 is only set with P1218, GO to V2 . If DTC P1298 is also present, REPLACE the IDM. If DTC P1662 is also present, GO to W1 .

</TD></TR></TBODY></TABLE>

 

Part Two...:

V10 CHECK FOR INTERMITTENT OPEN ON THE CID CIRCUIT 817 (Y/LB)

• Key off.
• Install breakout box, leave PCM disconnected.
• Disconnect IDM.
• Check for intermittent open on CID circuit.
• Measure resistance on (CID) Circuit 817 (Y/LB) between IDM connector Pin 16 and PCM Test Pin 96.
• Grasp the harness close to the IDM connector. Wiggle, shake the harness while working your way back to the PCM connector, and while looking for a spike on the DVOM.

Did readings remain below 5 ohms throughout procedure?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">GO to V11 . </TD><TD width="50%">REPAIR open in the (CID) Circuit 817 (Y/LB). RESTORE vehicle. CLEAR DTCs and RETEST. </TD></TR></TBODY></TABLE>

V11 CHECK FOR INTERMITTENT SHORT TO POWER ON THE CID CIRCUIT 817 (Y/LB)

• Key on, engine off.
• Check for intermittent short to power on CID circuit.
• Measure voltage on (CID) Circuit 817 (Y/LB) between PCM Test Pin 96 and ground Pins 25, 51, 76, 77, 91 and 103.
• Grasp the harness close to the IDM connector. Wiggle, shake the harness while working your way back to the PCM connector, and while looking for a spike on the DVOM.

Did voltage ever appear throughout procedure?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">REPAIR short to power on the (CID) Circuit 817 (Y/LB). RESTORE vehicle. CLEAR DTCs and RETEST. </TD><TD width="50%">RESTORE vehicle and TEST-DRIVE. If DTC reappears, REPLACE the IDM. </TD></TR></TBODY></TABLE>

V12 DIAGNOSTIC TROUBLE CODE (DTC) P1219

• Key on, engine off.
• Perform KOEO On-Demand Self Test.

Was DTC P1219 present?


<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">If DTC P1219 was present without P1667, GO to V13 . </TD><TD width="50%">If DTCs P1663, P1667 and P1668 are also present with DTC P128, GO to U6 .

If DTC P1667 is only set with P1219, GO to V2 . If DTC P1298 is also present, REPLACE the IDM. RESTORE vehicle. CLEAR DTCs and RETEST. IF DTC P1662 is also present, GO to W1 .

</TD></TR></TBODY></TABLE>

V13 CHECK FOR INTERMITTENT SHORT TO GROUND ON THE CID CIRCUIT 817 (Y/LB)

• Key off.
• Install breakout box, leave PCM disconnected.
• Disconnect IDM.
• Check for intermittent short to ground on CID circuit.
• Measure resistance on (CID) Circuit 817 (Y/LB) between PCM Test Pin 96 and ground Pins 25, 51, 76, 77, 91 and 103.
• Grasp the harness close to the IDM connector. Wiggle, shake the harness while working your way back to the PCM connector, and while looking for a spike on the DVOM.

Did readings ever drop below 10,000 ohms throughout procedure?
<TABLE cellSpacing=0 cellPadding=3 width="92%" border=1><TBODY><TR><TH width="50%">Yes </TH><TH width="50%">No </TH></TR><TR><TD width="50%">REPAIR short to ground on the (CID) Circuit 817 (Y/LB). </TD><TD width="50%">RESTORE vehicle, TEST-DRIVE. If DTC reappears, REPLACE the IDM. RESTORE vehicle. CLEAR DTCs and RETEST. </TD></TR></TBODY></TABLE>





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