Electric Cooling Fan Function Check
- Start engine. On models with A/C, turn A/C on. Ensure A/C clutch engages. On models without A/C, run engine until cooling fan begins to operate. See COOLING FAN OPERATING TEMPERATURES table under DESCRIPTION & OPERATION. On all models, if cooling fan(s) do not operate at any fan speed, perform QUICK TEST .
- If a trouble code is indicated while performing QUICK TEST, perform appropriate test. See appropriate table under TROUBLE CODE DIRECTORY . If after performing QUICK TEST, a Code 111 (pass code) is displayed and no other codes exist, go to next step.
- Enter output state Diagnostic Test Mode (DTM). See ADDITIONAL SYSTEM FUNCTIONS . Once output state DTM has been entered, ensure all outputs are off. Depress throttle (near wide open). Wait for Malfunction Indicator Light (MIL) to flash once (about 10 seconds). Release throttle.
- Cooling fan should run at low speed (LFC). Depress throttle to turn fan off. Depress throttle again. Wait until MIL flashes 2 consecutive times (about 15 seconds). Release throttle. Cooling fan should run at high speed (HFC).NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 6). No test procedures have been omitted.
- 6)
Exit output state DTM. If cooling fan(s) do not operate as specified, perform appropriate test. See TROUBLE SHOOTING DIRECTORY
table. If cooling fans operate as specified and vehicle is equipped with A/C, check A/C Pressure Switch (ACPSW). Go to step 35) under LOW/HIGH FAN CONTROL (LFC/HFC) RELAYS
.TROUBLE SHOOTING DIRECTORY
Application Go To Step Only One Fan Operates 2.5L (1) 50 Cooling Fan Inoperative (1) 40 Cooling Fan Always On (1) 25 (1) Perform appropriate step under LOW/HIGH FAN CONTROL (LFC/HFC) RELAYS .