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code 13 problems

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Old 10-18-2005, 01:15 AM
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Car: GTA 89
Engine: L98
Transmission: TH700
Axle/Gears: BW 9 bolt
code 13 problems

Hello all

This code will flash when engine reach operating temp and go to closed loop. I replaced the oxygen sensor with new one....and no effect

car was running lean imho, bad fuel pump maybe?
Old 10-18-2005, 06:18 PM
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Code 13 usually indicates a fault with the sensor or sensor circuit. If it was running lean, typically a code 44 will set.

With the Key On and Engine Off, unplug the Oxygen Sensor connector and measure the PCM side of the connector with a Digital Multimeter. You should have 450mV +/-. If not, then there is an open circuit in the wire or the ECM is faulty.
Old 10-19-2005, 04:00 AM
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Car: GTA 89
Engine: L98
Transmission: TH700
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Originally posted by GMTech
With the Key On and Engine Off, unplug the Oxygen Sensor connector and measure the PCM side of the connector with a Digital Multimeter. You should have 450mV +/-. If not, then there is an open circuit in the wire or the ECM is faulty. [/B]
Hi

I do that - multimeter reads 0.95V with the ignition on....
Old 10-19-2005, 03:42 PM
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Originally posted by pawcio
Hi

I do that - multimeter reads 0.95V with the ignition on....
Thats on the ECM side of the harness with the sensor unplugged? If so, borrow another ECM and re-measure. If its not within a few millivolts of 450, then the ECM or circuit is bad.
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