DETECTED CONDITION | POSSIBLE CAUSE | ||
C14 | Output voltage is not within the following range. | TP sensor maladjusted TP sensor circuit open or short | |
P0120 | Difference between actual throttle opening and opening calculated by ECM is larger than specified value. 0.2 V ≤ Sensor voltage < 4.8 V | TP sensor malfunction ECM malfunction | |
P0120 | H | Sensor voltage is higher than specified value. | TP sensor circuit shorted to VCC or ground circuit open |
L | Sensor voltage is lower than specified value. | TP sensor circuit open or shorted to ground or VCC circuit open |
Inspection
Step 1 (When indicating C14:)
- 1) Turn the ignition switch OFF.
- 2) Remove the fuel tank. (6-3)
- 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 В and gr)ound.
- 7) If OK, then measure the voltage at the Red wire В and B/Br wire С.
- TP sensor input voltage: 4.5 - 5.5 V
- (+ Red - − Ground)
- (+ Red - − B/Br)
- 09900-25008: Multi-circuit tester set
- Tester knob indication: Voltage
Is the voltage OK?
YES | Go to Step 2. |
NO | Loose or poor contacts on the ECM coupler (terminal 11 or 29). Open or short circuit in the Red wire or B/Br wire. |
Step 1 (When indicating P0120-H:)
- 1) Turn the ignition switch OFF.
- 2) Remove the fuel tank. (6-3)
- 3) Check the TP sensor coupler for loose or poor contacts. If OK, then check the TP sensor lead wire continuity.
- 4) Disconnect the TP sensor coupler.
- 5) Check the continuity between P/B wire А and Red wire В.
If the sound is not heard from the tester, the circuit condition is OK.
- 6) Disconnect the ECM coupler. (5-37)
- 7) Check the continuity between P/B wire А and terminal 8.
- 8) Also, check the continuity between B/Br wire С and terminal 29.
Caution: When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a needle pointed tester probe to prevent the terminal damage or terminal bend.
- TPS lead wire continuity: Continuity (•)))
- 09900-25008: Multi-circuit tester set
- 09900-25009: Needle pointed probe set
- Tester knob indication: Continuity test (•)))
Is the continuity OK?
YES | Go to Step 2. |
NO | P/B wire shorted to VCC, or B/Br wire open |
- 9) After repairing the trouble, clear the DTC using SDS tool. (5-26)
Step 1 (When indicating P0120-H:)
- 1) Turn the ignition switch OFF.
- 2) Remove the fuel tank. (6-3)
- 3) Check the TP sensor coupler for loose or poor contacts. If OK, then check the TP sensor lead wire continuity.
- 4) Disconnect the TP sensor coupler.
- 5) Check the continuity between P/B wire А and ground.
- 6) Also, check the continuity between P/B wire С and B/Br wire 29. If the sound is not heard from the tester, the circuit condition is OK.
- 7) Disconnect the ECM coupler. (5-37)
- 8) Check the continuity between P/B wire А and terminal В.
- 9) Also, check the continuity between Red wire С and terminal 29.
Caution: When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a needle pointed tester probe to prevent the terminal damage or terminal bend.
- TPS lead wire continuity: Continuity (•)))
- 09900-25008: Multi-circuit tester set
- 09900-25009: Needle pointed probe set
- Tester knob indication: Continuity test (•)))
Is the continuity OK?
YES | Go to Step 1 (5-41) and go to Step 2. |
NO | Red wire or P/B wire open, or P/B wire shorted to ground |
- 10) After repairing the trouble, clear the DTC using SDS tool. (5-26)
Step 2
- 1) Turn the ignition switch OFF.
- 2) Disconnect the TP sensor coupler and ECM coupler.
- 3) Install the test harness to the TP sensor.
- 4) Check the continuity between terminal А and ground.
TP sensor continuity: ∞ Ω (Infinity)
(Terminal А - Ground)
- 5) If OK, then measure the TP sensor resistance at the test harness terminals (between terminal А and terminal В).
- 6) Turn the throttle grip and measure the resistance.
- 7) If OK, then measure the TP sensor resistance at the test harness terminals (between terminal С and terminal D).
- TP sensor resistance: Approx. 5.0 kΩ
- (Terminal С - Terminal D)
- 09900-25008: Multi-circuit tester set
- Throttle valve is closed: Approx. 1.1 kΩ
- Throttle valve is opened: Approx. 4.3 kΩ
- 09900-28630: TPS test wire harness
- Tester knob indication: Resistance (Ω)
Are the continuity and resistance OK?
YES | Go to Step 3. |
NO | Reset the TP sensor position correctly. Replace the TP sensor with a new one. |
- 8) After repairing the trouble, clear the DTC using SDS tool. (5-26)
Step 3
- 1) Connect the TP sensor coupler 1 to the test harness.
- 2) Turn the ignition switch ON.
- 3) Measure the TP sensor output voltage at the coupler (between + P/B and − B/Br) by turning the throttle grip.
TP sensor output voltage:
- Throttle valve is closed: Approx. 1.1 V
- Throttle valve is opened: Approx. 4.3 V
- 09900-25008: Multi-circuit tester set
- Tester knob indication: Voltage
Is the voltage OK?
YES | P/B, Red or B/Br wire open or shorted to ground, or poor 8, 11 or 29 connection If wire and connection are OK, intermittent trouble or faulty ECM. Recheck each terminal and wire harness for open circuit and poor connection. Replace the ECM with a known good one, and inspect it again. |
NO | If check result is not satisfactory, replace TP sensor with a new one. |
- 4) After repairing the trouble, clear the DTC using SDS tool. (5-26)