Symptom Tree t096
Cause | Correction |
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Electronic fault codes active or high counts of inactive fault codes |
Refer to Section TF in the Troubleshooting and Repair Manual Electronic Control System ISM and QSM11 Engines, Bulletin 3666266 and the Troubleshooting and Repair Manual CM870 Electronic Control System ISM Engines, Bulletin 4021381. |
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Intake manifold temperature sensor is malfunctioning |
Check the intake manifold temperature sensor. Refer to Procedure 019-059 Troubleshooting and Repair Manual Electronic Control System ISM and QSM11 Engines, Bulletin 3666266 and the Troubleshooting and Repair Manual CM870 Electronic Control System ISM Engines, Bulletin 4021381. |
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Vehicle speed is too low for adequate cooling with high engine load |
Reduce the engine load. Increase the engine (fan) rpm by downshifting. |
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Radiator shutters are not opening completely or the shutterstat setting is wrong |
Inspect the radiator shutters. Repair or replace if necessary. Refer to the manufacturer’s instructions. Check the shutterstat setting. Refer to Procedure 008-020 or 008-049. |
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Cold weather radiator cover or winterfront is closed |
Open the cold weather radiator cover or the winterfront. Maintain a minimum of 384 cm2 [60 in2] or approximately 19.6 x 19.6 cm [7.5 x 7.5 in] of opening at all times. |
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Charge air cooler fins, radiator fins, or air conditioner condenser fins are damaged or obstructed with debris |
Inspect the charge air cooler, air conditioner condenser, and radiator fins. Clean, if necessary. Refer to Procedures 010-027 and 008-042 and the OEM service manual. |
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Fan shroud is damaged or missing or the air recirculation baffles are damaged or missing |
Inspect the shroud and the recirculation baffles. Repair, replace, or install, if necessary. Refer to Procedure 008-038 and the OEM service manual. |
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Fan drive belt is loose |
Check the belt tension and tighten if necessary. Refer to Procedure 008-002. |
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Fan drive or fan controls are malfunctioning |
Check the fan drive and controls. Refer to Procedure 008-024, 008-025, 008-026, 008-027, or 008-028. |
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Fan is not an adequate size for the application |
Verify that the fan is the correct size. Refer to the engine and OEM specifications. |
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EGR cooler malfunctioning |
Check the EGR cooler. Refer to Procedure 011-019. |
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Intake air or exhaust leaks |
Refer to Procedure 010-024 or the Engine Performance Troubleshooting Tree in Section TT. |