DR-28C A/C Input Signal to Computer

This test must be done with a WARM engine.
1. With engine warm and A/C control in Off position, connect a diagnostic readout box to engine harness connector.
2. Set system in Switch Test Mode.
3. Ensure A/C control is in Off position.
4. If Code 88 appears on display when A/C button is pressed, then returns to 00 when turned off, replace computer.
5. If Code 88 does not appear, proceed to Step D.