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Ford 1999 Mustang, Workshop Manual

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Ford 1999 Mustang Workshop Manual Download Page 9

Instrument Cluster C251

Measure voltage between instrument cluster C251 Pin 10, Circuit 729 (RD/WH), harness side and ground.

Is the voltage greater than 10 volts?

Yes

GO to 

A2

.

No

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

A2

 CHECK THE RUN POWER SUPPLY TO THE INSTRUMENT CLUSTER

Measure the voltage between instrument cluster C251 Pin 11, Circuit 489 (PK/BK), harness side and ground.

Is the voltage greater than 10 volts?

Yes

GO to 

A3

.

No

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

A3

 CHECK RUN/START POWER SUPPLY TO THE INSTRUMENT CLUSTER

Instrument Cluster C251

Measure the voltage between the instrument cluster C251 Pin 12, Circuit 20 (WH/LB), harness side and 

ground.

Page 9 of 32

1999 Mustang Workshop Manual

1/18/2013

http://www.fordtechservice.dealerconnection.com/pubs/content/~WSXB/~MUS~LEN/20/...

Summary of Contents for 1999 Mustang

Page 1: ...t indicator is hardwired from the low engine coolant switch to the instrument cluster When low engine coolant is detected the low engine coolant switch will close thus grounding the low engine coolant...

Page 2: ...tion will be stored in KAM and the indicator will be proved out for three seconds during each ignition cycle If this message is not received within 500ms the instrument cluster will send the request T...

Page 3: ...29 15A 30 15A 32 15A 34 20A 35 15A 37 15A 38 20A 39 5A Blown battery junction box BJB Fuse 103 50A Damaged circuitry Damaged switches or sensors Odometer Display Description GAGE Activates gauge swee...

Page 4: ...EC REFER to Section 419 01 B1317 9317 Battery Voltage High HEC REFER to Section 414 00 B1318 9318 Battery Voltage Low HEC REFER to Section 414 00 B1342 9342 ECU Is Defective HEC INSTALL a new Instrume...

Page 5: ...LAMP CONTROL O DOFFLMP OFF ON INDICATOR LAMP CONTROL PRNDL LMP OFF LOW2 INDICATOR LAMP CONTROL PRNDL LMP OFF NEUT INDICATOR LAMP CONTROL II BKFLD LOW OFF ON INDICATOR LAMP CONTROL II FUEL LOW OFF ON I...

Page 6: ...lease Circuit Short to Battery GEM REFER to Section 501 14B B1555 Ignition Run Start Circuit Failure GEM REFER to Section 211 05 B1603 Lamp Anti Theft Indicator Circuit Failure GEM REFER to Section 41...

Page 7: ...RLY OFF ON HORN CONTROL HORN OFF ON INDICATOR LAMP CONTROL II BKFLD LOW OFF ON MODULE SLEEP MODULE SLEEP OFF ON PARAMETER RESET ALARM OFF ON PARAMETER RESET ALL OFF ON PARAMETER RESET F R OFF ON PARAM...

Page 8: ...e system warning indicator is never always on Circuitry Generator GEN 10300 Bulb Instrument cluster GO to Pinpoint Test M An indicator is inoperative always on high beam Circuitry Bulb Instrument clus...

Page 9: ...e between instrument cluster C251 Pin 11 Circuit 489 PK BK harness side and ground Is the voltage greater than 10 volts Yes GO to A3 No REPAIR the circuit CLEAR the DTCs REPEAT the self test A3 CHECK...

Page 10: ...ess than 5 ohms Yes GO to A5 No REPAIR the circuit CLEAR the DTCs REPEAT the self test A5 CHECK GROUND CIRCUIT 1205 BK FOR OPEN Measure the resistance between instrument cluster C251 Pin 1 Circuit 120...

Page 11: ...e less than 5 ohms Yes GO to B4 No REPAIR the circuit CLEAR the DTCs REPEAT the self test B3 CHECK CIRCUIT 1001 WH YE FOR OPEN CJB Fuse 39 5A Measure the resistance between GEM C291 Pin 2 Circuit 1001...

Page 12: ...ELLEVEL active command Trigger monitor and scroll FUELLEVEL at 0 50 and 100 Does the fuel gauge display below E at 0 half at 50 and F at 100 Yes GO to C2 No INSTALL a new instrument cluster REFER to I...

Page 13: ...new fuel tank REFER to Section 310 01 CLEAR the DTCs REPEAT the self test C4 CHECK THE FUEL PUMP ASSEMBLY Check the fuel pump assembly in tank mounting float float rod wiring and connections for dama...

Page 14: ...CIRCUIT 327 BK OG AND CIRCUIT 397 BK WH Measure the resistance between instrument cluster C251 Pin 20 Circuit 397 BK WH harness side and fuel pump assembly C420 Pin 8 Circuit 327 BK OG harness side I...

Page 15: ...s than 5 ohms between the instrument cluster and the oil pressure switch and greater than 10 000 ohms between the instrument cluster and ground Yes INSTALL a new oil pressure switch CLEAR the DTCs REP...

Page 16: ...rtrain Control Emissions Diagnosis PC ED manual No INSTALL a new instrument cluster REFER to Instrument Cluster CLEAR the DTCs REPEAT the self test CONDITIONS DETAILS RESULTS ACTIONS I1 CHECK IF THE G...

Page 17: ...on 419 10 CLEAR the DTCs REPEAT the self test I6 CHECK CIRCUIT 450 DG LG FOR A SHORT TO GROUND BETWEEN THE GEM AND THE INSTRUMENT CLUSTER Instrument Cluster C250 Measure the resistance between the GEM...

Page 18: ...t 450 DG LG harness side and ground Did the safety belt indicator illuminate Yes INSTALL a new GEM REFER to Section 419 10 CLEAR the DTCs REPEAT the self test No GO to I9 I9 CHECK CIRCUIT 450 DG LG FO...

Page 19: ...uster C250 Observe the O D OFF indicator Did the indicator turn off Yes REFER toPowertrain Control Emissions Diagnosis PC ED manual No INSTALL a new instrument cluster REFER to Instrument Cluster CLEA...

Page 20: ...ter CLEAR the DTCs REPEAT the self test K3 CHECK CIRCUIT 794 LB FOR AN OPEN Connect a fused 5A jumper wire between the low engine coolant switch C137 Pin 2 Circuit 794 LB harness side and ground Did t...

Page 21: ...ew low engine coolant switch CLEAR the DTCs REPEAT the self test No GO to K6 K6 CHECK CIRCUIT 794 LB FOR SHORT TO GROUND Measure the resistance between low engine coolant switch C137 Pin 2 Circuit 794...

Page 22: ...L4 No GO to L10 L4 DETERMINE IF GEM IS SENDING THE CORRECT OUTPUT SIGNAL Trigger the GEM active command BKFLD LOW Did the instrument cluster BRAKE warning indicator illuminate Yes INSTALL a new GEM RE...

Page 23: ...128 VT YE harness side and ground Is the resistance greater than 10 000 ohms Yes REPAIR or INSTALL a new parking brake switch as needed CLEAR the DTCs REPEAT the self test No REPAIR the circuit CLEAR...

Page 24: ...EFER to Instrument Cluster CLEAR the DTCs REPEAT the self test No REPAIR the circuit CLEAR the DTCs REPEAT the self test L10 CHECK THE BRAKE FLUID LEVEL SWITCH FOR AN INTERNAL GROUND Brake Fluid Level...

Page 25: ...t cluster REFER to Instrument Cluster CLEAR the DTCs REPEAT the self test No REPAIR the circuit CLEAR the DTCs REPEAT the self test CONDITIONS DETAILS RESULTS ACTIONS M1 CHECK CHARGING SYSTEM Check ch...

Page 26: ...between instrument cluster C250 Pin 5 Circuit 904 LG RD harness side and generator C154 Circuit 904 LG RD harness side Is the resistance less than 5 ohms Yes INSTALL a new instrument cluster REFER to...

Page 27: ...LS RESULTS ACTIONS N1 CHECK THE HIGH BEAM LAMP OPERATION Operate the high beams Do the high beams operate correctly Yes GO to N2 No REFER to Section 417 01 N2 CHECK CIRCUIT 932 GY WH AND CIRCUIT 12 LG...

Page 28: ...used 5A jumper wire between anti lock brake control module C141 Pin 16 Circuit 603 DG harness side and ground Does the ABS indicator illuminate Yes INSTALL a new anti lock brake control module REFER t...

Page 29: ...ON indicator illuminate Yes REFER to Powertrain Control Emissions Diagnosis PC ED manual No INSTALL a new instrument cluster REFER to Instrument Cluster CLEAR the DTCs REPEAT the self test CONDITIONS...

Page 30: ...uster REFER to Instrument Cluster CLEAR the DTCs REPEAT the self test No REPAIR Circuit 3 LG WH LH or Circuit 2 WH LB RH CLEAR the DTCs REPEAT the self test CONDITIONS DETAILS RESULTS ACTIONS R1 DETER...

Page 31: ...S3 CHECK CIRCUIT 904 LG RD FOR OPEN OR SHORT TO GROUND Instrument Cluster C250 Generator C154 Measure resistance between generator C154 Pin 3 Circuit 904 LG RD harness side and instrument cluster C250...

Page 32: ...DTCs REPEAT the self test CONDITIONS DETAILS RESULTS ACTIONS U1 CHECK THE TACHOMETER OPERATION Trigger the HEC active command TCHOMETER Scroll to 0 50 and 100 Did the tachometer display read 0 at 0 h...

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