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DTC P0122: TP Sensor Circuit Low Voltage Honda S2000 AP1

Testing & Diagnostics 5 illustrations ~393 words

Note. Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

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Scheme 39: DTC P0122: TP Sensor Circuit Low Voltage
Scheme 39: DTC P0122: TP Sensor Circuit Low Voltage

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  1. Turn the ignition switch ON (II).
  2. Check the throttle position with a scan tool or the HDS. Is there about 6% when the throttle is fully closed and about 90% when the throttle is fully opened? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the TP sensor and at the ECM. NO - Go to step 3.
  3. Turn the ignition switch OFF.
  4. Disconnect the TP sensor 3P connector.
  5. Turn the ignition switch ON (II).
  6. Measure voltage between TP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 7. NO - Go to step 13 .
  7. Turn the ignition switch OFF.
  8. At the sensor side, measure resistance between TP sensor 3P connector terminals No. 1 and No. 2 with the throttle fully closed. Is there about 0.5-0.9 kohms? YES - Go to step 9. NO - Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(ref-221333-S24874381242006022400000) ).
  9. Measure resistance between TP sensor 3P connector terminals No. 2 and No. 3 with the throttle fully closed. Is there about 4.5 kohms? YES - Go to step 10. NO - Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(ref-221333-S24874381242006022400000) ).
  10. Reconnect the TP sensor 3P connector.
  11. Turn the ignition switch ON (II).
  12. Measure voltage between ECM connector terminals C18 and C27. Is there about 0.3 V when the throttle is fully closed and about 4.5 V when the throttle is fully opened? YES - Substitute a known-good ECM (see «HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES»(ref-221328-S04997151962006022400000) ) and recheck. If the TP sensor voltage is now normal, replace the original ECM (see «ECM REPLACEMENT»(ref-221329-S30667517252006022400000) ). NO - Repair short in the wire between the ECM (C27) and the TP sensor.
  13. Measure voltage between ECM connector terminals C18 and C28. Is there about 5 V? YES - Repair open in the wire between the ECM (C28) and the TP sensor. NO - Substitute a known-good ECM (see «HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES»(ref-221328-S04997151962006022400000) ) and recheck. If the prescribed voltage is now available, replace the original ECM (see «ECM REPLACEMENT»(ref-221329-S30667517252006022400000) ).

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