CIRCUIT DESCRIPTION Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control) on page DI-43 . DTC No.
DTC Detecting Condition
Trouble Area
P0133
Response time for the oxygen sensor’s voltage output tochange from rich to lean, or from lean to rich, is 1 sec. or more during idling after the engine is warmed up (2 trip detection logic)
Open or short in heated oxygen sensor circuit Heated oxygen sensor Air induction system Fuel pressure Injector ECM
HINT: Sensor 1 refers to the sensor closer to the engine body.
INSPECTION PROCEDURE HINT: Read freeze frame data using TOYOTA hand-held tester or OBD II scantool. Because freeze frame records the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc. at the time of the malfunction.
1
Are there any other codes (besides DTC P0133) being output?
YES
Go to relevant DTC chart (See page DI-14 ).
NO
2002 ECHO (RM884U)
Author:
Date:
222
DI-53 DIAGNOSTICS
2
-
ENGINE
Check the output voltage of oxygen sensor during idling.
PREPARATION: Warm up the oxygen sensor the engine at 2,500 rpm for approx. 90 sec. CHECK: Use the OBD II scan tool or TOYOTA hand-held tester read the output voltage of the oxygen sensor during idling. OK: Oxygen sensor output voltage: Alternates repeatedly between less than 0.4 V and more than 0.55 V (See the Following table).
P18349
OK
Perform confirmation driving pattern (See page DI-48 ).
NG
3
Check for open and short in harness and connector between ECM and oxygen sensor (bank 1 sensor 1) (See page IN-19 ).
NG
Repair or replace harness or connector.
OK
4
Check air induction system (See page SF-1 ).
NG
Repair or replace induction system.
OK
2002 ECHO (RM884U)
Author:
Date:
223
DI-54 DIAGNOSTICS
5
-
ENGINE
Check fuel pressure (See page SF-6 ).
NG
Check and repair fuel pump, fuel pipe line and filter (See page SF-1 ).
OK
6
Check injector injection (See page SF-21 ).
NG
Replace injector.
OK
Replace oxygen sensor (bank 1 sensor 1).
7
Perform confirmation driving pattern (See page DI-48 ).
Voltage output of the heated oxygen sensor remains at 0.40 V or more, or 0.50 V or less when the vehicle is driven at 40 km/h. (25 mph) or more after the engine ...
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