Toyota 2VZ-FE, Manual

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Check voltage between terminals VF1 and E1 of ECU connector.
When code 25 is displayed, go to step [ 3 ].
Warm up engine at normal operating temperature.
(1) Using SST, connect terminals TE1 and E1 of
check connector.
SST 09843–18020
(2) Using an analog voltmeter, connect positive
prove to VF1 terminal and negative prove to E1
terminal of check connector, and set it to 5–20
V range.
(3) Warm up oxygen sensor by running engine at
2,500 rpm for about 2 minutes.
(4) Then, maintaining engine at 2,500 rpm, count
how many times needle of voltmeter fluctuates
between 0 and 5 V.
Needle fluctuates a minimum of 8 times for every 10
seconds.
When code 26 is displayed, go to step [ 5 ].
When codes 25 and 26 are displayed, go to
step [ 3 ].
When voltage stays at 5 V, go to step [ 5 ].
When needle fluctuates less than 8 times for
every 10 seconds, replace main oxygen sensor.
Check harness or connector between ECU and main oxygen
sensor, ECU and check connector.
Repair or replace harness or connector.
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See page
IG–1
FI–15
FI–49
FI–37
FI–37
EM–15
Check air leakage.
Check item
Check installation of main oxygen sensor.
Check ignition system (misfire).
Check fuel system.
Check water temp. sensor (characteristics deviation).
Check air flow meter (characteristics deviation).
Check intake air temp. sensor (characteristics deviation).
Check valve timing (characteristics deviation).
Check each item found to be a possible cause of problem.
Check each item found to be a possible cause of problem.
Repair or replace.
(Voltage stays
at 0 V)
(California specification vehicles)
TR–50
– ENGINE TROUBLESHOOTING Circuit Inspection