Symptom Tree t046
| Cause | Correction |
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Electronic fault codes active or high counts of inactive fault codes |
Refer to Section TF in the Fault Code Troubleshooting Manual, Bulletin |
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Programmable parameters or selected features are not correct |
Check the programmable parameters and the selected features with an electronic service tool. Set the parameters and features again, if necessary. Refer to |
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Manual fan ON/OFF switch and circuit is malfunctioning |
Check the manual fan ON/OFF switch and circuit. Refer to Procedure 019-045, Procedure 019-380, and |
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Air conditioner sensor or circuit is malfunctioning |
Check the air conditioner sensor and circuit. Refer to Procedure 019-261 and |
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Fan clutch actuator or circuit is malfunctioning |
Check the fan clutch actuator circuit. Refer to |
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Engine electrical ground is malfunctioning |
Check engine ground to chassis and chassis ground to battery negative (-) post. Refer to Procedure 013-009 in Section 19 and the OEM service manual. |
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Electronic control module (ECM) calibration is malfunctioning |
Verify that the electronic control module (ECM) calibration is correct. Check the calibration revision history for applicable fixes to the calibration stored in the ECM. Refer to the calibration history spreadsheet Click here to see ecm_calibration_rev_history.xls on QuickServe™ Online Internet Website or the INCAL™ calibration CD. Compare the calibration stored in the ECM with the engine rating and the Control Parts List (CPL), Bulletin 4021328. If necessary, calibrate the ECM. Refer to Procedure 019-032 in Section 19 |
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Intake manifold temperature or coolant temperature is above the threshold to activate the cooling fan. |
Refer to the Intake Manifold Air Temperature Above Specification and/or the Collant Temperature Above Normal – Gradual Overheat symptom trees. |
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