FI SYSTEM DIAGNOSIS 4-43 “C14” (P0120-H/L) TP SENSOR CIRCUIT MALFUNCTION DETECTED CONDITION POSSIBLE CAUSE C14 Output voltage is not within the following • TP sensor maladjusted range. • TP sensor circuit open or short Difference between actual throttle open- • TP sensor malfunction ing and opening calculated by ECM is • ECM malfunction larger than specified value. 0.2 V Sensor voltage < 4.8 V P0120 H Sensor voltage is higher than specified • TP sensor circuit shorted to VCC or ground circuit value. open L Sensor voltage is lower than specified • TP sensor circuit open or shorted to ground or value. VCC circuit open ECM TP sensor R VCC P/B TP B/Br E E2 PL INSPECTION M 1 Step 1 (When indicating C14:) 1) Turn the ignition switch OFF. A 2) Lift and support the fuel tank. (5-3) S 3) Check the TP sensor coupler for loose or poor contacts. If OK, then measure the TP sensor input voltage. 4) Disconnect the TP sensor coupler. 5) Turn the ignition switch ON. 6) Measure the voltage at the Red wire B and ground. 7) If OK, then measure the voltage at the Red wire B and B/Br wire C. TP sensor input voltage: 4.5 – 5.5 V 1 (+ Red – - Ground) V (+ Red – - B/Br) 09900-25008: Multi-circuit tester set Tester knob indication: Voltage () Is the voltage OK? YES Go to Step 2. • Loose or poor contacts on the ECM coupler NO (terminal A or S). • Open or short circuit in the Red wire or B/Br wire.