causes for the annoying code 25 & 26
#1
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causes for the annoying code 25 & 26
Hi all,
for the past 2 - 3 months I've had this problem with my 95 4runner. Have checked and rechecked as well as replaced sensors to no avail. I've been searching the forums trying to figure out what may be the cause of these 2 codes popping up on me all the time and I've just about lost all hope. So here I am, again, with another request. To those of you that have had these 2 codes, could you possibly share what the culprit was and how you remedied it.
thanks............
for the past 2 - 3 months I've had this problem with my 95 4runner. Have checked and rechecked as well as replaced sensors to no avail. I've been searching the forums trying to figure out what may be the cause of these 2 codes popping up on me all the time and I've just about lost all hope. So here I am, again, with another request. To those of you that have had these 2 codes, could you possibly share what the culprit was and how you remedied it.
thanks............
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the ground wires on the plenum could be loose.
coolant temp sensor.
oxygen sensor.
a wire end can become loose in the plug and not make contact.
debris lodged in the AFM.
use this info to test the AFM
RESISTANCE
Between terminals E1 and FC
measuring plate fully closed infinity
measuring plate other than closed zero
Between terminals VC and E2
always 200 - 400 ohms
Between terminals THA and E2
at -20C (-4F) 10 - 20 k ohms
at 0C (32F) 4 - 7 k ohms
at 20C (68F) 2 - 3 k ohms
at 40C (104F) 0.9 - 1.3 k ohms
at 60C (104F) 0.4 - 0.7 k ohms
Between terminals VS and E2
measuring plate fully closed 200 - 600 ohms
measuring plate fully open 20 - 1200 ohms
NOTE: Resistance between terminals E2 and VS will change in a wave pattern as the measuring plate slowly opens.
check the ohms in the injectors.
13.4 - 14.2 Ohms
check the wires, harness and connectors. make sure they are not damaged, burned, or eatin by a mouse.
coolant temp sensor.
oxygen sensor.
a wire end can become loose in the plug and not make contact.
debris lodged in the AFM.
use this info to test the AFM
RESISTANCE
Between terminals E1 and FC
measuring plate fully closed infinity
measuring plate other than closed zero
Between terminals VC and E2
always 200 - 400 ohms
Between terminals THA and E2
at -20C (-4F) 10 - 20 k ohms
at 0C (32F) 4 - 7 k ohms
at 20C (68F) 2 - 3 k ohms
at 40C (104F) 0.9 - 1.3 k ohms
at 60C (104F) 0.4 - 0.7 k ohms
Between terminals VS and E2
measuring plate fully closed 200 - 600 ohms
measuring plate fully open 20 - 1200 ohms
NOTE: Resistance between terminals E2 and VS will change in a wave pattern as the measuring plate slowly opens.
check the ohms in the injectors.
13.4 - 14.2 Ohms
check the wires, harness and connectors. make sure they are not damaged, burned, or eatin by a mouse.
#4
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I've changed everything concievably changeable and still no result. Ive tested the afm and its within spec but just in case, i'm trying to get a used one to swap it out. I've got a hunch that i've been runnin lean for a while because my fan has been engaging when when outside temp has not been that hot ;70+ (clutch was replaced w factory one).
one of you mentioned the distributor. how would that be a factor?
one of you mentioned the distributor. how would that be a factor?
#7
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code 25 ..Air/fuel ratio lean malfunction..... probable cause..injector circuit, oxygrn sensor or circuit, ECM, fuel line pressure(injector blockage or leakage) ,air temp. sensor or circuit, air leak, air flow meter, air intake system, ignition system.
code 26..Air/fuel rich malfunction... probable cause...injector or injector circuit, coolant temp.sensor or circuit, airflow meter, oxygen sensor or circuit, cold start injector, ECM.
code 26..Air/fuel rich malfunction... probable cause...injector or injector circuit, coolant temp.sensor or circuit, airflow meter, oxygen sensor or circuit, cold start injector, ECM.
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