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Discussion Starter #1
Hey all,
  1. I have a 1999 7.3 f350. The crankshaft broke so a "newer" motor has been installed. The truck starts and runs, but has a slightly rough idle (some shaking and just not as smooth as it used to be) and is giving a p1316 code along with the general idm code. The shop put new valve cover gaskets along with the harness, the injectors were redone at full force diesel, it has a dp tuner that was updated with the injectors, I was told buzz test was good, injectors ohmed out good, all wires on uvch checked, the idm was swapped out. The shop has been checking all pins and wires but no luck. Any thoughts? Thanks, Leigh.
  2. I've gone through a lot of the other threads about p1316 issues but don't see anything else.
 

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DIAGNOSTIC TROUBLE CODE (DTC) P1316 INDICATES THAT CODES ARE STORED IN THE IDM
Possible causes:
Injector(s) or circuit(s)
Open or shorted IDM enable circuit
Open/short in EF circuit
Open/short in FDCS circuit
IDM relay
IDM powering circuits
IDM
PCM
Check for other codes.
Key on, engine off.
Perform KOEO On-Demand Self Test.
P1316 OR P1670, CHECK FOR AN INTERMITTENT OPEN CIRCUIT
Key off.
Install breakout box, leave PCM disconnected.
Disconnect IDM.
Check for intermittent open in the following circuits:
Measure resistance on (FDCS) Circuit 821 (BR/O) between IDM connector Pin 17
and PCM Test Pin 95.
Measure resistance on (EF) Circuit 818 (GY/W) between IDM connector Pin 4 and
PCM Test Pin 48.
Grasp the harness close to the IDM connector. Wiggle, shake the harness while working
your way back to the PCM, while looking for a spike on the DVOM.
Description The IDM provides the EF output signal to the PCM to confirm that proper timing/duration of fuel delivery command signal (FDCS) was received. Additionally, the EF signal is used to send diagnostics of the IDM and injectors (electrical) to the PCM.
DTC Description
P1668 = PCM-IDM diagnostic communication error
P1670 = Electronic feedback signal not detected
P1316 = Indicates that IDM DTCs are stored within the IDM
DTC P1668 and P1670 indicates that a communication error has occurred between the
PCM and the IDM.
Possible causes:
Open fuse
IDM relay
Open or shorted IDM enable circuit
Open/short in EF circuit
Open/short in FDCS circuit
IDM powering circuits
PCM
Check for other codes.
Key on, engine off.
Perform KOEO On-Demand Self Test and retrieve Continuous DTCs.
CHECK CIRCUIT 818 (GY/W) FOR OPEN
Install breakout box; leave PCM disconnected.
Disconnect the IDM harness connector.
Measure resistance on Circuit 818 (GY/W) between PCM Test Pin 48 and IDM harness
connector Pin 4.
Key on, engine off. Measure for voltage on Circuit 818 (GY/W) between PCM Test Pin 48 and battery ground.
Turn ignition switch to OFF. Measure resistance on Circuit 359 (GY/R) between PCM Test Pin 91 and IDM connector
Pin 2.
CHECK IDM POWER
PCM connected, IDM disconnected.
Key on, engine off. Measure voltage between IDM connector Pin 14 and battery ground.
CHECK IDM GROUND
Key off. Measure resistance between IDM connector Pin 26 and battery ground.
MEASURE FREQUENCY ON THE EF LINE
Connect PCM to breakout box.
IDM connected to harness.
Set up NGS Scan tool as follows:
Connect NGS Tester to the DLC
Connect test probe between NGS common and breakout box Pin 77 (ground).
Connect second test probe between NGS signal and breakout box Pin 48 (EF line).
Select VEHICLE and ENGINE
Select DIGITAL MEASUREMENT SYSTEM
Change level to 4 VOLT DC
Press the link button to choose a PID
Select PID/DATA MONITOR
Select RPM PID
Press START
Key on, engine running.
Measure frequency at 3 different RPMs.
rpm Frequency (Hz)
1000 66
2000 133
3000 200


stolen from another Truck message board, Thanks WHITE
 

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Discussion Starter #3
Thanks for the response. We took a chance and ordered a PCM and that was the problem. Codes went away and seems to running good.
 
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