P2122, P2123, P2127, P2128, P2138; Troubleshooting - Yamaha MT-09 2021 Service Manual

EAS20632

P2122, P2123, P2127, P2128, P2138

EAS33112

TROUBLESHOOTING

Item
• [P2122] Accelerator position sensor: open or ground short circuit detected.
• [P2123] Accelerator position sensor: power short circuit detected.
• [P2127] Accelerator position sensor: open or ground short circuit detected.
• [P2128] Accelerator position sensor: power short circuit detected.
• [P2138] Deviation error
Fail-safe system
• Able/unable to start engine
• Able/unable to drive vehicle
Procedure
TIP
If a DTC other than P2138 (P2122, P2123, P2127, or P2128) is indicated, perform troubleshooting first.
1. Connection of accelerator position sensor coupler.
• Check the locking condition of the coupler.
• Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the
pins).
Is the coupler condition normal?
YES
→ Go to step 2.
NO
a. Connect the coupler securely or replace the wire harness.
b. Turn the main switch to "ON", and then check the condition of the DTC using the malfunction
mode of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 6, and complete the service.
NO
→ Go to step 2.
2. Connection of ECU coupler.
• Check the locking condition of the coupler.
• Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the
pins).
Is the coupler condition normal?
YES
→ Go to step 3.
NO
a. Connect the coupler securely or replace the wire harness.
b. Turn the main switch to "ON", and then check the condition of the DTC using the malfunction
mode of the YDT.
P2122, P2123, P2127, P2128, P2138
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