Checking components and connections

Fig 1: Identifying Ignition Switch ON Position

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Check the signal cable. Check for a short-circuit to supply voltage.

Take readings between:

• Engine Control Module (ECM) terminal #B48 (#B58) and terminal #2 of control module cooling fan.

Remedy as necessary.

Other information: 

• To connect the breakout box, see Connecting the breakout box
• For information about signals, see Signal specification 
• See Location of components
• To fault-trace the wiring and terminals, see Contents .

Fig 2: Identifying Engine Cooling Fan (FC) Control Modules

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  Refer to Information