Test B: The Front Electronic Module (FEM) Does Not Respond To The Diagnostic Tool

PINPOINT TEST B: THE FRONT ELECTRONIC MODULE (FEM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

B1-B2:

B2-B3:

B4-B5:

B5-B6:

B7:

Normal Operation
The FEM communicates with the diagnostic tool through the standard corporate protocol (SCP) communications network circuits 4-EG11 (GY) and 5-EG11 (BU). If one of the SCP communications network circuits become shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 4-EG11 (GY) and 5-EG11 (BU) between the FEM C201c and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is either an open in circuits 4-EG11 (GY) and 5-EG11 (BU), damage to the DLC C251, damage to the FEM C201c, or a problem with in-line connectors, interior auxiliary junction box (AJB) C283c, interior AJB C283d or joint connector No. 4 C223.

Possible Causes
- SCP data plus circuit 4-EG11 (GY) open
- SCP data minus circuit 5-EG11 (BU) open
- joint connector No. 4 C223
- interior AJB C283c
- interior AJB C283d
- FEM C201c
- FEM