Engine Cooling Systems
- Cooling System Servicing
- Maintenance
- Coolant Recovery Systems
- Thermostatically Controlled Electric Cooling Fans
- Trouble Shooting Charts
- Please Read This Before Performing The Following Tests
- X1 Check Battery Voltage
- X2 Check Battery Ground
- X3 Ground Faulty Isolation
- X4 Processor Ground Fault Isolation
- X5 Check Continuity Of Signal Return Circuit
- X6 Measure Voltage & Ground To Integrated Controller (Ic)
- X7 Key Power To Integrated Controller (Ic)
- X8 Measure Continuity Of VPWR
- X9 Measure Continuity Of Power Ground To Ic
- X10 Code 72 Or 78: Intermittent Open In VPWR Circuit
- X11 Check Power-To-Pump(S) Circuit
- X12 Check Resistance Of Fuel Pump Inertia Switch
- X13 Power-To-Pump(S) Circuit Continuity Check
- X14 Check Power-To-Pump(S) For Short To Power
- X15 Service Code: 87 Check Continuity Of Fuel Pump Circuit
- X16 Check Fuel Pump Circuit For Shorts To Power & Ground
- X17 Check Resistance Of Fuel Pump Relay Coil
- X20 No Fan, High Or Low W/No Code 83
- X21 Check Fan Motor
- X22 Check Fan Running Mode (Low)
- X23 Measure Battery Voltage Supply At Fan - Bypassing Ic
- X24 Cooling Fan Ground Verification
- X25 Jumper High Electric-Drive Signal (HEDF) To Ground
- X26 Check ECT Sensor
- X30 Code 83: Check Resistance Of HEDF Controller Circuit
- X31 Check HEDF Processor Signal To Ic For An Open
- X32 Check For Shorts To Ground In The HEDF Circuit
- X33 Check For Shorts To Power In The HEDF Circuit
- X35 Low Or High Speed Fan Always "On", No Code 83 Or 67
- X36 Check EDF Circuit For Shorts To Power
- X37 Check EDF For Short To Ground
- X40 No Fan
- X41 Check Fan Motor
- X42 Check Fan Running Mode
- X43 Measure Battery Voltage Supply At Fan - Bypassing Ic
- X44 Check EDF Circuit For Short To Ground
- X45 Cooling Fan Ground Verification
- X46 ECT Sensor Check
- X50 Check For Voltage At A/C Clutch
- X51 Check For Continuity From Ic To A/C Clutch
- X52 Enter Output State Check
- X53 Check WAC Output For Proper Electrical Operation
- X54 Check For Voltage At A/C Clutch Switch
- X55 Check Continuity Of ACCS To Integrated Controller (Ic)
- X56 Check Continuity Of ACCS Circuit
- X57 Check Continuity In WAC To Ic Circuit
- X58 Check WAC Circuit For Shorts To Ground
- X59 Check WAC Circuit For Shorts To Power
- X60 Check For Voltage At A/C Clutch
- X61 Check For Voltage At A/C Input To Controller
- X70 No Fan Primary Or Secondary W/No Code 82 Or 88
- X71 Fan Motors Check
- X72 Check Fan Running Mode (Low)
- X73 Measure Battery Voltage Supply At Fans - Bypassing Ic
- X74 Cooling Fan Ground Verification
- X75 Jumper Secondary Electric Drive Signal (HEDF) To Ground
- X76 ECT Sensor Check
- X80 Code 82 Or 88: Check EDF Signal To Ic For Shorts To GND
- X81 Check Fan Running Mode
- X82 Fan Always On W/Code 82 Or 88: CHK EDF Sig To Ic Integrated CNTRLR) For Open CKT
- X83 Check EDF Circuit For Shorts To Power
- X84 Check EDF Short To Ground
- X90 Service Code 95: Check Inertia Switch
- X91 Verify That Fuel Pump Is Off
- X92 Check For Fuel Pump Relay Always Closed
- X93 Check Continuity Of FPM Circuit
- X94 Check For Continuity Between FPM Circuit & Ground
- X95 Service Code 96: Check Continuity Of Power-To-Pump CKT
- X96 Verify Fuel Pump Operation
- X100 Continuous Memory Code 95: Check EEC-IV Harness
- X101 Check FPM Circuit
- X102 Cont. Memory Code 96, Check For Cont. Memory Code 87
- X103 Check EEC-IV Harness
- X104 Cont. Memory Service Code 87: Check EEC-IV Harness
- Variable Speed Cooling Fans - Flex-Blade Fans
- Variable Speed Fans - Fan Clutch With Thermostatic Control
- Wiring Diagrams