Test F

PINPOINT TEST F: THE DUAL AUTOMATIC TEMPERATURE CONTROL (DATC) MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

Test F1:

Test F2-F3:

Normal Operation
The DATC module communicates with the diagnostic tool through the standard corporate protocol (SCP) communications network. Circuits 4-FA10 (GY/BK) and 5-FA10 (BU/YE) receive and transmit data from the DATC module to the data link connector (DLC). Degraded SCP performance occurs if one bus line is open, shorted to ground or voltage, or if one but not all termination resistors are lost.

Possible Causes
- circuit 4-FA10 (GY/BK) open
- circuit 5-FA10 (BU/YE) open
- DATC module C228b
- DATC module