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1989
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Cherokee Laredo, 2D Utility, 4.0 L, Automatic
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Repair and Diagnosis
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EGR System
EGR System
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Description
Operation
EGR System
Notes
2.5L Cherokee, Comanche & Wagoneer
2.5L Wrangler
4.0L Cherokee, Comanche & Wagoneer
4.2L Wrangler & 5.9L Grand Wagoneer
EGR Valve
Coolant Temperature Override (CTO) Switch
4.2L & 5.9L
Thermal Vacuum Switch (TVS)
4.2L & 5.9L
Forward Delay Valve
Testing Note
EGR System Testing
2.5L (CHEROKEE, COMANCHE & WAGONEER)
2.5L (Wrangler)
4.0L (CHEROKEE, COMANCHE & WAGONEER)
EGR Valve Testing
2.5L & 4.0L Only
Vacuum Transducer Test
2.5L & 4.0L Only
Valve Opening Test
4.2L & 5.9L Only
Valve Closing Test
4.2L & 5.9L Only
CTO Switch Testing
Coolant Temperature Override (CTO) Switch (4.2L & 5.9L Only)
TVS Switch Testing
Thermal Vacuum Switch (TVS)
Forward Delay Valve Test
5.9L Only