CONDITION
- The battery voltage is applied to the power steering fluid pressure switch (terminal No. 1) from the engine-A/T-ECU (terminal No. 52).
FUNCTION
- It is detected whether a load is applied on the power steering fluid pump by steering or not, and the signal is inputted to the engine-A/T-ECU. When the power steering fluid pressure switch ON signal (a large load on the power steering fluid pump) is inputted, the engine-A/T-ECU provides the idle-up control.
PROBABLE CAUSE
- Failed power steering fluid pressure switch
- Open/short circuit in power steering fluid pressure switch circuit or loose connector contact
- Failed engine-A/T-ECU
)
Q: Is the check result normal?
YES:
Go to Step 2 
.NO: Repair.
- Disconnect connector, and measure at harness side.
- Ignition switch: ON
- Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 8 .NO: Go to Step 3
.)
)
- Measure engine-A/T-ECU terminal voltage.
- Ignition switch: ON
- Voltage between terminal No. 52 and earth.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 4 .NO: Go to Step 5
.
Q: Is the check result normal?
YES:
- Check and repair harness between B-28 (terminal No. 1) power steering fluid pressure switch connector and C-111 (terminal No. 52) engine-A/T-ECU connector.
- Check output line for open circuit.
Q: Is the check result normal?
YES:
Go to Step 6 .NO: Repair.
- Check output line for short circuit.
Q: Is the check result normal?
YES:
Go to Step 7 .NO: Repair.
- Measure engine-A/T-ECU terminal voltage.
- Engine: Idling
- Voltage between terminal No. 52 and earth.
OK:
- System voltage (Steering wheel: Stationary)
- 1 V or less (Steering wheel: Turned)
Q: Is the check result normal?
YES:
Go to Step 11 .NO: Go to Step 9
.
Q: Is the check result normal?
YES:
Go to Step 10 .NO: Repair.
- Check output line for damage.
Q: Is the check result normal?
YES:
Replace power steering fluid pressure switch.NO: Repair.
Q: Is the check result normal?
YES:
Go to Step 7 .NO: Repair.