Diagnosis System

(a) Check the indicator.

When the ignition switch is turned ON, check that the PS warning light goes on for 1.5 seconds.

HINT:

• If the indicator check result is not normal, proceed to troubleshooting for the PS warning light circuit (See page DI-498).

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WARNING

OUTSIDE TEMP 75°F

psi run ids

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When the EMPS system is faulty, the master warning light in the combination meter and the PS warning light in the multiinformation display lights up.

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Sst 09843 18040

(b) In case of not using TOYOTA hand-held tester: Check the DTC.

(1) Using SST, connect terminals Tc and CG of the

DLC3. SST 09843-18040

PGND

PGND

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(2) Remove the EMPS ECU with connector still connected.

(3) Connect the both terminals of the 1kQ resistance and LED (Light Emitting Diode) circuit to terminals WL and PGND of the EMPS ECU.

(4) Turn the ignition switch ON.

(5) Read the DTC from the PS warning light.

Normal Code

Codes 21 and 22

Codes 21 and 22

Code 21

Code 22

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HINT:

If no code appears, inspect the diagnostic circuit and PS warning light circuit (See page DI-503 or DI-498). As an example, the blinking patterns for normal code and codes 21 and 22 are shown on the left.

(6) Codes are explained in the DTC chart on page DI-470.

(7) After completing the check, disconnect terminals Tc and CG of the DLC3, and turn off the display.

If 2 or more malfunctions are indicated at the same time, the lowest numbered DTC will be displayed first.

TOYOTA Hand-held Tester

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TOYOTA Hand-held Tester

Toyota Diagnosis

(c) In case of using TOYOTA hand-held tester: Check the DTC.

(1) Hook up the TOYOTA hand-held tester to the DLC3.

(2) Turn the ignition switch ON.

(3) Read the DTC by following the prompts on the tester screen.

HINT:

Please refer to the TOYOTA hand-held tester operator's manual for further details.

(d) In case of not using TOYOTA hand-held tester: Clear the DTC.

(1) Using SST, connect terminals Ts and CG of DLC3. 09843-18040 Turn the ignition switch ON. ON and OFF the terminal CG of the DLC3 4 times or more within 8 seconds, delete DTC of the EMPS ECU.

Check that the PS warning light shows the normal code.

Remove the SST from the DLC3. 09843-18040

TOYOTA Hand-held Tester

TOYOTA Hand-held Tester

Prius Diagnosis Foto

(e) In case of using TOYOTA hand-held tester: Clear the DTC.

(1) Hook up the TOYOTA hand-held tester to the DLC3.

(2) Turn the ignition switch ON.

(3) Operate the TOYOTA hand-held tester to erase the codes. (See TOYOTA hand-held tester operator's manual.)

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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