I have been getting a check engine light at low (idle) rpm. When checked the codes are for the #14 pin the following:
2: Fuel pump relay (circuit 87) not functioning
3: TN/TD signal (RPM) interrupted
4: Output for oxygen sensor heater control defective
5: Output for air injection pump control defective
6: Output for kickdown switch control defective
12: Output for A/C compressor control defective
13: Excessive A/C compressor clutch slippage
When I check the wiring diagram most of these go through the Engine Systems control unit. Could it be this unit or actually all of these things? How to check?
The check engine light goes away upon acceleration.

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Buddy Ligon
1985 300SD
1969 280SE Cabriolet