C1551 · blink 51 – IG Power Source Circuit Malfunction
- System
- EMPS
- Dashboard light
- EPS (electric power steering) warning
- Check-engine blink code
- 51
- Market note
- EMPS (electric power steering) is not fitted on PK cars; PK cars use hydraulic steering.
- Applies to
- Cars with electric power steering only. NOT fitted on PK cars: the EPC fig 4502 hydraulic vane pump covers ZZE12#..PKN and NZE120.
- Description
- IG Power Source Circuit Malfunction
- Detection / symptoms
- Detection: The abnormal IG voltage value which is not within the specifi- cation is input to EMPS ECU.
- Possible causes
- EMPS ECU; Power source circuit; Charging system
- What to check
- Workshop check order (RM821E): CHECK FUSE (ECU−IG) -> CHECK POWER STEERING COMPUTER ASSY (EMPS ECU) -> CHECK WIRE HARNESS. OPEN AND SHORT CIRCUIT (PGND − BODY GROUND)
- Confidence
- high (official Toyota RM821E)
From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights