Power Solutions International

DTC 122

UnclassifiedElectrical

What This Code Means

MIL ON during active fault; Engine Shutdown; TPS 1 Signal Voltage Low; TPS1 voltage < 0.200 VDC; TPS1 voltage falls below 0.200 VDC

Possible Causes

  • •TPS1 voltage is greater than 4.8V or less than 0.2V AND TPS2 voltage is greater than 4.8V or less than 0.2V
  • •Simultaneous voltage out-of-range faults for both TPS 1 and TPS2
  • •Throttle Position Sensor (TPS) failure
  • •Intermittent problem
  • •Poor throttle connection
  • •Faulty harness
  • •TPS1 signal shorted to ground in the harness
  • •Faulty ECM connection
  • •Faulty TPS (Throttle Position Sensor)
  • •Faulty throttle
  • •Faulty ECM

Suggested Actions

  1. 1Replace the electronic throttle assembly
  2. 2Troubleshoot according to TPS1 voltage out-of-range following DTC 122 and 123 procedures
  3. 3Troubleshoot according to TPS2 voltage out-of-range following DTC 222 and 223 procedures
  4. 4Perform the On-Board (OBD) System Check
  5. 5Investigate intermittent problem
  6. 6Repair the poor throttle connection
  7. 7Key Off. Disconnect wire harness header from ECM. CAREFULLY remove yellow lock from header at the device output terminal. CAREFULLY check resistance between TPS1 input at ECM header and signal at the device. DO NOT INSERT probes or objects into terminals, as this can damage terminals. Probe from the side.
  8. 8Inspect for potential TPS1 signal shorted to ground in the harness
  9. 9Inspect for faulty ECM or TPS (Throttle Position Sensor)

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