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madding intermittent hesitation - ECU connector 200 1988

posted by  tbb2 on  Mon Oct 1 17:10 CST 2012
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last visit: Wed Jul 16 18:57 CST 2014
[RELATED]

I've started checking wiring and sensors from the ECU connector under the passenger side dash.

Changes from 18 months ago:
Check Ground Connections:
Ground to:
# 5 - 0.1 Ohm (spec “nearly zero”)
#11 - 0.1 to 0.2 Ohm (spec “nearly zero”)
#19 - 0.2 to 0.3 Ohm (spec “nearly zero”)
#25 - 0.1 Ohm (spec “nearly zero”)
#11 connected to 19 -0.1 to 0.2 (spec zero)

Previously these all checked at 0 Ohms.

Coincidentally I get 0.1 to 0.2 Ohm at each end of the Valve Cover to Firewall Ground.

What might be causing and increase in resistance? Would a deteriorating wire conductor do this?

I also am no longer getting battery voltage (12.24)
at the ECU power supply (#18 - ground; w/ ignition On) (12.04)
OR
at the AMM (11.8)

The IAC, Temp Sensor and AMM all checks out okay, though the Lamda sond "reheat resistor" is 1 Ohm instead of 3)

Any suggestions pass swapping out the AMM?





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