Code No. P1778: Malfunction of Stepper Motor
STEPPER MOTOR SYSTEM CIRCUIT
DIAGNOSTIC FUNCTION
JUDGMENT CRITERIA
PROBABLE CAUSES
- Malfunction of CVT-ECU
- Malfunction of valve body assembly (Faulty stepper motor)
DIAGNOSTIC PROCEDURE |
STEP 1. Check other diagnosis codes. |
Q.
Are other diagnosis codes set?
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 Carry out the appropriate troubleshooting. |
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 Go to Step 2. |
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STEP 2. Symptom recheck after erasing diagnosis code |
Q.
Is the check result normal?
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| Intermittent malfunction |
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| Replace the CVT-ECU, and then go to Step 3. |
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STEP 3. Retest the system. |
Q.
Is the check result normal?
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| The inspection is complete. |
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| Replace the valve body assembly. |
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