Check Engine Light
03-06-2009, 03:50 PM
#1
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Check Engine Light
I have a 95 4Runner with 3.0
Check engine light has a code 25 ( Lein fuel mixture)
takes anywhere from 50 to 100 miles of driving before it comes on -----
Any Ideas??
Check engine light has a code 25 ( Lein fuel mixture)
takes anywhere from 50 to 100 miles of driving before it comes on -----
Any Ideas??
03-06-2009, 04:46 PM
#2
Contributing Member
I'd start by looking at the FSM for a 3.0. http://personal.utulsa.edu/~nathan-b...85diagnosi.pdf
From link above
For code 25:
Diagnosis
Trouble area
See pages EG2-197 EG2-199
From link above
For code 25:
Diagnosis
(1) Heated oxygen sensor output is less than
0.45 V for at least 90 sacs. when heated
oxygen sensor is warmed up (racing at
2.000 rpm) and drive at 50 – 100 km/h
0.45 V for at least 90 sacs. when heated
oxygen sensor is warmed up (racing at
2.000 rpm) and drive at 50 – 100 km/h
• Engine ground bolt loose
• Open in E1 circuit
• Open in injector circuit
• Fuel line pressure (Injector
blockage, etc. )
• Open or short in heated
oxygen sensor circuit
• Heated oxygen sensor
• Ignition system
• Engine coolant temp. sensor
• Volume air flow meter (Air intake)
• ECM
• Open in E1 circuit
• Open in injector circuit
• Fuel line pressure (Injector
blockage, etc. )
• Open or short in heated
oxygen sensor circuit
• Heated oxygen sensor
• Ignition system
• Engine coolant temp. sensor
• Volume air flow meter (Air intake)
• ECM
03-06-2009, 04:58 PM
#3
Contributing Member
Also note from the link above:
(c) (2 trip detection logic)
The diagnostic trouble codes 21, 25, 26 and 71 are
used ”2 trip detection logic” is used. With this logic,
when a logic malfunction is first detected, the mal–
function is temporarily stored in the ECM memory. If
the same case is detected again during the second
drive test, this second detection causes the malfunc–
tion indicator lamp to light up.
The 2 trip repeats the same mode a 2nd time.
(However, the IG SW must be turned OFF between
the 1 st time and 2nd time).
The diagnostic trouble codes 21, 25, 26 and 71 are
used ”2 trip detection logic” is used. With this logic,
when a logic malfunction is first detected, the mal–
function is temporarily stored in the ECM memory. If
the same case is detected again during the second
drive test, this second detection causes the malfunc–
tion indicator lamp to light up.
The 2 trip repeats the same mode a 2nd time.
(However, the IG SW must be turned OFF between
the 1 st time and 2nd time).
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