Service Procedure
Fan Coupler Function Inspection1. Refer to Electronic Service Manual (ESM) to Diagnose and repair any DTCs FIRST before proceeding with Fan Coupling diagnostic.
^ Any DTCs found are not covered by this bulletin. Refer to Warranty Flat Rate Manual for appropriate warranty coding.
2. Use CONSULT III-plus "Active Test" and select "FAN DUTY CONTROL" and then following items to monitor:
^ ENG SPEED
^ COOLANT TEMP/S
^ COOLING FAN SPD
3. Start engine and allow the coolant temperature to reach 80-95°C (176-203°F).
4. With the engine at idle and with the A/C OFF, set the FAN DUTY to 0%.
^ Confirm that the cooling fan speed is below the engine idle speed.
5. Now change the FAN DUTY to 100%.
a. Raise the engine speed slowly to 2000 rpm several times and allow it to return to idle, and then confirm that the fan speed increases above engine idle speed (this may take up to 1 minute).
b. If the fan speed increases go to step 6.
c. If the fan speed does not increase go to step 7.
6. Set the FAN DUTY back to 0%.
Slowly raise the engine rpm up to 2000 rpm and hold until the fan speed drops below 600 rpm (this may take up to 1 minute).
a. If the fan speed decreases go to ECM reprogramming.
b. If the fan speed will not decrease, return engine to idle and allow at least 3 minutes at idle for the fan speed to decrease below engine idle speed.
c. If the fan speed does not decrease go to step 7.
d. If the fan speed now does decrease go to ECM reprogramming.
7. If the fan speed will not increase (step 5) or decrease (step 6) using Active Test, replace the fan coupling shown in Figures 4 and 5, then go to step 8 for ECM reprogramming.
NOTE:
Refer to ESM Engine Cooling Section for procedure to replace fan coupler.
ECM Reprogram
8. Refer to Electronic Service Manual (ESM) to Diagnose and repair any DTCs first before proceeding with ECM reprogramming.
NOTE:
^ Most instructions for reprogramming with CONSULT-III plus (C-III plus) are displayed on the CONSULT PC screen.
^ If you are not familiar with the reprogramming procedure, refer to "CONSULT- III plus (C-III plus) Reprogramming" general procedure.
^ Take the vehicle for a 10 minute drive in order to meet the following Idle Air Volume Learn (IAVL) conditions:
> Engine coolant temperature: 70-100°C (158-212°F)
> Battery voltage: More than 12.9V (At idle)
> Transmission: Warmed up
^ After reprogramming is complete, you will be required to perform Throttle Valve Closed Position, Idle Air Volume Learn, Accelerator Closed Position, and DTC erase.
CAUTION
9. Connect the CONSULT PC to the vehicle to begin the reprogramming procedure.
10. Open ASIST on the CONSULT PC and start C-III plus.
11. Wait for the plus VI to be recognized / connected.
^ Serial number will display when the plus VI is recognized / connected.
12. Select Re/programming, Configuration.
13. Follow the on-screen instructions and navigate the C-III plus to the screen shown in Figure 8 above.
14. When you get to the screen shown in Figure 8, confirm this bulletin applies as follows.
A. Find the ECM Part Number and write it on the repair order.
NOTE:
This is the current ECM Part Number (P/N).
B. Compare the P/N you wrote down to the numbers in the Current ECM Part Number column in Table A above.
^ If there is a match, continue with the reprogramming procedure.
^ If there is not a match, close C-III plus and refer to ASIST for further diagnostic information.
15. Follow the on-screen instructions to navigate C-III plus and reprogram the ECM.
NOTE:
^ In some cases, more than one new P/N for reprogramming is available.
> In this case, the screen in Figure 9 displays.
> Select and use the reprogramming option that does not have the message "Caution! Use ONLY with NTBXX-XXX".
^ If you get this screen and it is blank (no reprogramming listed), it means there is no reprogramming available for this vehicle. Close C-III plus and refer back to ASIST for further diagnosis.
16. When the screen in Figure 10 displays, reprogramming is complete.
NOTE:
If the screen in Figure 10 does not display (reprogramming does not complete), refer to the information below.
17. Disconnect the battery charger from the vehicle.
18. Select Next.
NOTE:
^ In the next steps, you will perform Throttle Valve Closed Position, Idle Air Volume Learn, Accelerator Closed Position, and DTC erase.
^ These operations are required before C-III plus will provide the final reprogramming confirmation report.
ECM/TCM recovery:
Do not disconnect plus VI or shut down Consult III plus if reprogramming does not complete.
If reprogramming does not complete and the "!?" icon displays as shown in Figure 11 above.
If reprogramming does not complete and the "X" icon displays as shown in Figure 12 above.
19. Follow the on-screen instructions to perform the following:
^ Throttle Valve Closed Position
^ Idle Air Volume Learn (IAVL)
NOTE:
^ Listed below are common conditions required for IAVL to complete.
^ If IAVL does not complete within a few minutes, a condition may be out of range.
^ Refer to the appropriate Electronic Service Manual (ESM) for specific conditions required for the vehicle you are working on.
> Engine coolant temperature: 70-100°C (158-212°F)
> Battery voltage: More than 12.9V (At idle)
> Selector lever: P or N
> Electric load switch: OFF (Air conditioner, headlamp, rear window defogger)
> Steering wheel: Neutral (Straight-ahead position)
> Vehicle speed: Stopped
> Transmission: Warmed up
^ Accelerator Pedal Close Position Learning
^ Erase DTCs
20. When the entire reprogramming process is complete, the screen in Figure 13 will display.
21. Verify the before and after part numbers are different.
22. Print a copy of this screen (Figure 13) and attach it to the repair order for warranty documentation.
23. Select Confirm.
24. Close C-III plus.
25. Turn the ignition OFF.
26. Disconnect the plus VI from the vehicle.
27. Test drive the vehicle and make sure it operates correctly and the MIL is OFF.
^ If the MIL comes ON, go back to ASIST for further diagnostic information.
^ Diagnosis and repairs beyond ECM reprogramming are not covered by this bulletin.