![]() A module scan with a DRBIII scan tool would have indicated that all modules were functional except the BCM. This should reset the BCM.Details:Diagnosis with a scan tool should be the first step in a case such as this. Reconnect and retest for proper operation. This is a fairly common problem.Vehicle:1999-2004 (WJ) Jeep Grand CherokeeConcern:All 4 power windows inoperative.Cause:The BCM (body control module) is electrically 'locked up'.Resolution:Disconnect the battery for about 10 minutes. Usually it must be replaced from under the vehicle. The CKP sensor is located on the left side all the way in the back. The connector is located on the right side of the engine, near the rear of the engine block. When the the CKP sensor shorts internally, the PCM will not function. The PCM is not functioning, so the fuel and voltage data is not bussed to the instrument cluster. This is why the fuel gauge and volt gauge are inoperative. Unplug the CKP sensor and retest for proper gauge operation.Resolution:Replace the CKP sensor to correct.Details:Scan tool will show 'no response' to PCM (engine computer). Volt gauge is all the way to the left (low), but the battery is not discharged.Cause:The CKP (crankshaft position) sensor is shorted internally. Related symptoms: Fuel gauge shows 'empty', however the fuel tank is not empty. Leak is usually slow/minor.Vehicle:1993-1998 (ZJ) Jeep Grand Cherokee with 4.0L engine, 1999-2004 (WJ) Jeep Grand Cherokee with 4.0L engine, 1997-2001 (XJ) Jeep Cherokee with 4.0L engine, 1997-2006 (TJ) Wrangler with 4.0L engine.Concern:Engine cranks but will not start. Coolant will run down the case and under the carpet. Inspect the HVAC black plastic case in the passenger side footwell for evidence of leak. Vehicle will have no heat, but A/C will still operate.Details:Heater core is leaking. Hose splices are available at any auto parts store. Passenger side carpet may be wet/moist.Cause:The heater core is leaking.Resolution:Replace the heater core.Alternative/temporary repair:Locate the 2 heater hoses going to the firewall underhood. Related symptom: Odd smell from A/C dash vents. Vehicle:1999-2004 (WJ) Jeep Grand CherokeeConcern:Coolant loss/have to add coolant periodically. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |