P1646-HYDRAULIC COOLING FAN CONTROL CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

  Ignition on and engine running.

• Set Condition:

  An open or shorted condition in the Hydraulic Fan Solenoid Control circuit is detected by the Front Control Module.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) .

Diagnostic Test

• Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

• Go To 2

• Go To 3

• Repair the open or short to ground in the (A916) Fused B+ circuit
• Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

• Go To 4

• Repair the excessive resistance in the (K173) Hydraulic Radiator Fan Solenoid Control circuit.
• Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

• Repair the short to ground in the (K173) Hydraulic Radiator Fan Solenoid Control circuit.
• Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

• Go To 5

• Go To 6

• Repair the excessive resistance in the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the IPM.
• Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

• Repair the short to ground in the (K173) Hydraulic Radiator Fan Solenoid Control circuit in the IPM.
• Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

• Go To 7

NOTE: Before continuing, check the FCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

• Repair as necessary.
• Perform BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

• Replace and program the Front Control Module per Service Information.
• Perform BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)