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DTC 32: Sub-Throttle Position Sensor Signal Malfunction

  1. Check for DTC P1400 and P1401 from ECM. If no codes exist, go to next step. If either or both codes exist, diagnose and repair ECM codes first. See TESTS W/CODES - TURBO & TESTS W/CODES - NON-TURBO article in ENGINE PERFORMANCE section.
  2. Remove throttle control ECU with connectors attached. Remove intake air duct. Disconnect sub-throttle valve motor connector. Turn ignition on. Check voltage (backprobe) between throttle control ECU connector T15 terminal No. 3 (Gray/Red wire) and ground with sub-throttle valve fully closed and fully open. Voltage should be 0-3 volts with throttle closed and 9-14 volts with throttle open. If voltage is as specified, go to step 4). If voltage is not as specified, go to next step.
  3. Check for open or short in Gray/Red wire between throttle control ECU connector T15 terminal No. 3 and sub-throttle position sensor connector S5 terminal No. 2. Repair if necessary. If no problem is found, go to next step.
  4. Check voltage (backprobe) between throttle control ECU connector T15 terminal No. 6 (Violet/Yellow wire) and ground with throttle fully closed and fully open. Voltage should be 0.3-0.8 volts with throttle closed and 3.2-4.9 volts with throttle open. If voltage is as specified, go to step 6). If voltage is not as specified, go to next step.
  5. Check for open or short in Violet/Yellow wire between throttle control ECU connector T15 terminal No. 26 and ECM connector E10 terminal No. 40. Repair if necessary. If no problem is found, check throttle control ECU. See THROTTLE CONTROL ECU PIN VOLTAGE TESTS under PIN VOLTAGE . Replace ECU if necessary.
  6. Check throttle position sensor. See THROTTLE POSITION SENSOR under COMPONENT TESTS . Adjust or replace if necessary. See ADJUSTMENTS article under ENGINE PERFORMANCE section. If sensor is okay, go to next step.
  7. Disconnect sub-throttle valve motor connector. Check resistance between motor connector terminals No. 1 and 3. Check resistance between motor connector terminals No. 4 and 6. If resistance is 40-48 ohms, go to next step. If resistance is not 40-48 ohms, replace sub-throttle valve motor.
  8. Check for open or short in Brown wire between throttle control ECU connector T15 terminal No. 26 and ground. Repair if necessary. If no problem is found, check throttle control ECU. See THROTTLE CONTROL ECU PIN VOLTAGE TESTS under PIN VOLTAGE . Replace ECU if necessary.
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