DETECTED CONDITION | POSSIBLE CAUSE |
The operation voltage does not reach the STVA. ECM does not receive communication signal from the STVA. | STVA malfunction STVA circuit open or short STVA motor malfunction |
Inspection
Step 1
- 1) Remove the air cleaner chamber. (6-13)
- 2) Check the STVA lead wire coupler for loose or poor contacts.
- 3) Turn the ignition switch ON to check the STV operation. (STV operating order: Full open → 95% open)
Is the operating OK?
YES | Go to Step 2. |
NO | Loose or poor contacts on the STVA coupler Open or short circuit in the B/Lg, P/W, W/B or Green wires If wire and connection are OK, go to Step 2. |
- 4) After repairing the trouble, clear the DTC using SDS tool. (5-26)
Step 2
- 1) Turn the ignition switch OFF.
- 2) Disconnect the STVA lead wire coupler.
- 3) Check the continuity between each terminal and ground.
- STVA continuity: ∞ Ω (Infinity)
- (Terminal - Ground)
- 4) If OK, then measure the STVA resistance (between Black wire A and Pink wire B) and (between Green wire C and W/BI wire D).
- STVA resistance: Approx. 7 Ω
- (B/Lg A - P/W B)
- (Green C - W/B D)
- 09900-25008: Multi-circuit tester set
- Tester knob indication: Resistance (Ω)
Is the resistance OK?
YES | W/B, P/W, Green and B/Lg wire open or shorted to ground, or poor 1, 2, 18 and 19 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 | Loose or poor contacts on the ECM coupler. Replace the STVA with a new one. |
- 5) After repairing the trouble, clear the DTC using SDS tool. (5-26)
Active control inspection
- 1) Set up the SDS tool. (Refer to the SDS operation manual for further details.)
- 2) Turn the ignition switch ON.
- 3) Click "Secondary throttle operating control" 1.
- 4) Click each button 2.
At this time, if an operation sound is heard from the STVA, the function is normal.