Problem Symptoms Table

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each problem symptom in the order given in PROBLEM SYMPTOMS and proceed to the relevant troubleshooting procedure.

PROBLEM SYMPTOMS

Symptom/Suspect Area

See

At The Time Of Idling, Steering Control Force Is Great ⁽¹⁾

(1) Check The DTC Reconfirming That The Normal Code Is Output

b Or c

(2) Power Source Circuit

DTC C1552/52: PIG POWER SOURCE CIRCUIT

(3) Brake ECU

(4) Power Steering Gear Assembly With Motor

ELECTRIC POWER STEERING GEAR

Even If The Vehicle Speed Is Increased, Appropriate Steering Resistance Cannot Be Felt ⁽²⁾

(1) Check The DTC Reconfirming That The Normal Code Is Output

b Or c

(2) Brake ECU

(3) Power Steering Gear Assembly With Motor

ELECTRIC POWER STEERING GEAR

PS Warning Light Abnormal

PS Warning Light Circuit

DTC C1556/56: P/S WARNING LIGHT CIRCUIT

EMPS ECU

.....

DTC Check Cannot Be Done ⁽³⁾

PS Warning Light Circuit

DTC C1556/56: P/S WARNING LIGHT CIRCUIT

Tc Terminal Circuit

Tc TERMINAL CIRCUIT

Speed Sensor Signal Check Cannot Be Done

Ts Terminal Circuit

Ts TERMINAL CIRCUIT

EMPS ECU

.....

Brake ECU

⁽¹⁾	Only when following steps 1 to 4 are all normal and the problem is still occurring, replace the EMPS ECU.

⁽²⁾	Only when following steps 1 to 3 are all normal and the problem is still occurring, replace the EMPS ECU.

⁽³⁾	Only when following steps 1 and 2 are all normal and the problem is still occurring, replace the EMPS ECU.