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I just replaced my intake manifold gasket, checked/adjusted the valves, and swapped in some injectors (on the truck in my sig....). The truck starts, runs, and drives, but I have a check engine light with the P0222 code (APPS low input voltage). When scanned, it actually shows two P0222 codes. I erase the codes, but they immediately come back. Any ideas on where to start looking?

Edited by Mopar1973Man
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Pull the plug apart and make sure the connections are clean and making good contact. Also check thre voltage at the plug. There should be one wire at +5 volts, one that is the signal out from the APPS to the ECM, and a ground. Use a paper clip (or something similar) to probe the plug so you don't mess up the connectors. I can't tell you the wire colors, but you should be able to find it here on this site.

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Here is the diagnostic article.

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/163-p0222-idle-validation-both-low

 

DTC P0222: IDLE VALIDATION SIGNALS BOTH LOW

 

Monitor & Set Conditions

Idle validation signals are monitored when ignition is on and engine is running. DTC P0222 may be stored if Engine Control Module (ECM) senses no voltage signal or the same voltage from Idle Validation Switch (IVS) No. 1 and IVS No. 2. DTC P0223 may be stored if ECM senses the same voltage from IVS No. 1 and IVS No. 2.

 

Possible Causes

  • Accelerator Pedal Position Switch (APPS) Idle Validation Switch (IVS) No. 2 Harness Short To Ground
  • APPS IVS No. 2 Shorted To APPS Return Circuit
  • APPS IVS No. 2 Shorted To APPS Sensor Ground
  • IVS No. 2 Open Between APPS And ECM Harness Connectors
  • APPS IVS No. 1 Shorted To APPS Sensor Ground
  • APPS IVS No. 1 Shorted To APPS Return Circuit
  • APPS IVS No. 1 Harness Short To Ground
  • IVS No. 1 Open Between APPS And ECM Harness Connectors
  • IVS No. 1 Circuit Open
  • ECM

Testing

 

1. Turn ignition off. Disconnect APPS harness connector. APPS is located on bracket, just above fuel injection pump. Check for poor connection/terminal contact at APPS harness connector. Repair as necessary. Start engine and allow engine to idle. Using DVOM, measure voltage between ground and terminal No. 6 (Brown/Orange wire) on APPS connector. This is the IVS No. 1 circuit. If voltage is greater than 4.5 volts, go to next step. If voltage is 5.5 volts or less, go to step 8 .

 

2. With engine idling, using DVOM, measure voltage between ground and terminal No. 2 (Light Green/Dark Blue wire) on APPS harness connector. This is the IVS No. 2 circuit. If voltage is 4.5 volts or less, go to next step. If voltage is greater than 4.5 volts, test is complete.

 

3. Turn ignition off. Check for continuity between ground and terminal No. 2 (Light Green/Dark Blue wire) on APPS harness connector. If continuity exists, go to next step. If continuity does not exist, go to step 7 .

 

4. Ensure ignition is off and APPS harness connector is still disconnected. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Check for continuity between ground and terminal No. 2 (Light Green/Dark Blue wire) on APPS harness connector. If continuity exists, repair short to ground in Light Green/Dark Blue wire between APPS and ECM. If continuity does not exist, go to next step.

 

5. Ensure ignition is off. Ensure APPS harness connector and ECM harness connector are still disconnected. Check for continuity between terminal No. 2 (Light Green/Dark Blue wire) and terminal No. 4 (Black/Yellow wire) on APPS harness connector. If continuity exists, repair short between Light Green/Dark Blue wire and Black/Yellow wire. If continuity does not exist, go to next step.

 

6. Ensure APPS harness connector and ECM harness connector are still disconnected. Check for continuity between terminal No. 2 (Light Green/Dark Blue wire) and terminal No. 1 (Black/Light Blue wire) on APPS harness connector. If continuity exists, repair short between Light Green/Dark Blue wire and Black/Light Blue wire. If continuity does not exist, replace and program the ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article.

 

7. Ensure ignition is off and APPS harness connector is still disconnected. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Check continuity of Light Green/Dark Blue wire between terminal No. 2 on APPS harness connector and terminal No. 16 on ECM harness connector. If continuity exists, test is complete. If continuity does not exist, repair open in Light Green/Dark Blue wire between APPS and ECM.

 

8. Turn ignition off. Ensure APPS harness connector is still disconnected. Check for continuity between ground and terminal No. 6 (Brown/Orange wire) on APPS harness connector. If continuity exists, go to next step. If continuity does not exist, go to step 12 .

 

9. Ensure ignition is off and APPS harness connector is still disconnected. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50- pin connector. Check for poor connection/terminal contact at ECM harness connector. Check for continuity between terminal No. 6 (Brown/Orange wire) and terminal No. 1 (Black/Light Blue wire) on APPS harness connector. If continuity exists, repair short between Brown/Orange wire and Black/Light Blue wire. If continuity does not exist, go to next step.

 

10. Ensure APPS harness connector and ECM harness connector are still disconnected. Check for continuity between terminal No. 6 (Brown/Orange wire) and terminal No. 4 (Black/Yellow wire) on APPS harness connector. If continuity exists, repair short between Brown/Orange wire and Black/Yellow wire. If continuity does not exist, go to next step.

 

11. Ensure APPS harness connector and ECM harness connector are still disconnected. Check for continuity between ground and terminal No. 6 (Brown/Orange wire) on APPS harness connector. If continuity exists, repair short to ground in Brown/Orange wire. If continuity does not exist, test is complete.

 

12. Ensure ignition is off and APPS harness connector is still disconnected. Disconnect ECM harness connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Check for poor connection/terminal contact at ECM harness connector. Repair as necessary. Check Brown/Orange wire for continuity between terminal No. 6 on APPS harness connector and terminal No. 1 on ECM harness connector. If continuity exists, test is complete. If continuity does not exist, repair open in Brown/Orange wire between APPS and ECM.

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So I installed my sensor tonight and same problem. Actually had a 0222 code not a 0221. Wasnt getting any voltage down the signal wire. Had 5volts and ground. Well I noticed the previous owner cut the signal wire and the ground wires and ran news ones. Well I checked and the signal wire was grounded. Cut the wire and had throttle position. But no o/d and cruise so I am like wtf. Go home and open the hood. Well in the process of doing the tappet cover and bhaf I cut all the wire ties and forgot to get one wire secured. Happen to be the signal wire I cut and it ran to the pcm. I noticed it was ran around the front of the engine and it melted to the turbo housing thus grounding out the signal wire. Routed it the right way, and everything works perfect.

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Okay, I did the diagnostics, everything checked good. Reconnected everything and scanned and erased the codes......and they stayed erased this time. I don't know why they appeared at all, but I'll take it as a win. I'll drive it to work tonight and see if everything remains okay.......

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