Cooling System - MIL ON/Low Engine Power

Date: April 2, 2009

Order No.: S-B-09.41/22b

Supersedes: P-B-09.41/22a and T-B-09.41/23b dated April 19, 2006

Group: 09





Revision History





SUBJECT:
Check Engine Light On, Low Engine Output





If you receive customer reports in the above model vehicles of the check engine light being on and/or the engine has poor output, this may be due to the circulation pump for low temperature circuit (charge air cooler) being nonfunctional. Possible fault codes are shown above.

The following are possible causes for the malfunction of the circulation pump:

1. Carbon brush is worn due to the effects of vibration and/or its switching cycles.

2. Water ingress in the pump housing.

3. Deposits of ingredients from the coolant in the pump chamber.

4. Magnetic clutch broken.

To resolve, perform the below remedy.

1. Check fuse for circulation pump controller according to model series. Replace fuse if necessary.

2. Check circulation pump (component M44) via DAS in the general listing of guided tests. Replace the circulation pump if the diagnosis results show replacement is necessary.

3. For Model 170 ONLY, when replacing the old circulation pump part number with the new circulation pump part number the 5 amp fuse must be replaced with a 7.5 amp fuse. (The new pump has a higher starting current requiring the fuse to be replaced with a 7.5 amp fuse. The wiring is rated for this increase in fuse size.)

Note:
It is imperative to bleed the system to complete the circulation pump replacement. Improved pump, part number A000 500 03 86, replaces part number A000 500 01 86. Old parts must not be re-used.





Parts Information

Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on April 2, 2009. Please refer to Netstar --> Star TekInfo --> Star Time for the most current labor time allowance.





In Case of Warranty, use the table above.