Check for open and short in harness and connector between ECM and oxygen sensor See page IN

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PREPARATION:

(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.

(b) Warm up the engine to normal operating temp. CHECK:

Read voltage output of oxygen sensor when engine suddenly raced. HINT:

Perform a quick racing of 2,000 rpm or more 3 times by using the accelerator pedal. OK:

Oxygen sensor output voltage: Alternates from 0.40 V or less to 0.50 V or more.

Check that each connector is properly connected.

DI-62

DIAGNOSTICS - ENGINE

DI6V7-03

DTC

P0171

System too Lean (Fuel Trim)

DTC

P0172

System too Rich (Fuel Trim)

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