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low batrtery voltage

poor connection to ecm power supplies

poor ecm ground connections.

bad ecm. key points : Do not replace ecu before testing

Fuel Fail code 29 may be activated during engine start up when battery voltage is to low. this does not necessarily a faulty ecu.

start the engine several times. if code 29 does not recur, no further action is necessary. HAVE BATTERY TESTED FIRST. (load test only) if necessary. recharge or replace the battery clear the code by removeing battery cable.; retest vcm .

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14y ago
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Q: What can the reasons be for fuel failure 29 on jaguar xj6 1994 32 liter?
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