DTC P0122-A: THROTTLE POSITION SENSOR VOLTAGE LOW Chrysler LHS II

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.

1. Using scan tool, read Throttle Position (TP) sensor voltage. If TP sensor voltage is less than .2 volt, go to step 8 . If TP sensor voltage is .2 volt or more, go to next step.
2. While monitoring scan tool display, slowly open and close throttle. If voltage change is smooth, go to next step. If voltage change is not smooth, replace TP sensor. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) .
3. Stop moving throttle. While monitoring scan tool display, wiggle TP sensor wiring harness. If voltage changes when wiggling TP sensor harness, repair wiring harness as necessary where wiggling caused problem to appear. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) . If voltage did not change when wiggling TP sensor harness, go to next step.
4. Start engine. While monitoring engine RPM, wiggle TP sensor wiring harness. If engine RPM changed, repair wiring harness as necessary where wiggling caused problem to appear. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) . If engine RPM did not change, go to next step.
5. Condition to set trouble code is not present at this time. THROTTLE POSITION SENSOR VOLTAGE LOW DTC sets if Powertrain Control Module (PCM) terminal No. 35 is less than .2 volt for .7 seconds. Possible causes are: TP sensor signal is shorted to ground, TP sensor failure, loss of 5-volt supply, PCM failure, faulty connections or wiring. Go to next step.
6. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, go to next step. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) . If related wiring and connectors were repaired, perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) .
7. Using scan tool, read FREEZE FRAME data. Ensure hex code matches DTC on scan tool. Hex code should be 1A. Use this information for additional diagnostics. See «INACTIVE TROUBLE CODE CONDITION»(ref-576-S27765318282000030800000) under SELF-DIAGNOSTICS. Test is complete. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) .
8. Disconnect TP sensor connector. Using a voltmeter, check voltage of TP sensor 5-volt supply circuit at TP sensor connector. See «TP SENSOR WIRE IDENTIFICATION»(ref-576-S27375904852000030800000) table.
9. If voltage is 4 volts or more, go to next step. If voltage is less than 4 volts, repair open TP sensor 5-volt supply circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) .
10. Using scan tool, read TP sensor voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace TP sensor. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) .
11. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance of TP sensor signal circuit between TP sensor connector and ground. See «TP SENSOR WIRE IDENTIFICATION»(ref-576-S27375904852000030800000) table. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on TP sensor signal circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) .
12. Using an ohmmeter, check resistance between TP sensor signal circuit and TP sensor ground circuit at TP sensor connector. See «TP SENSOR WIRE IDENTIFICATION»(ref-576-S27375904852000030800000) table. If resistance is less than 5 ohms, repair TP sensor signal circuit for a short to TP sensor ground circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) . If resistance is 5 ohms or more, replace PCM. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) .

TP SENSOR WIRE IDENTIFICATION