Ford Mustang (1999-2004) Service Manual: Instrument Cluster Self-Diagnostic Mode

To enter the instrument cluster self-diagnostic mode, press and hold the instrument cluster SELECT/RESET button, turn the ignition switch to the RUN position, and then continue pressing the SELECT/RESET button (five seconds) until tESt is displayed in the odometer. The SELECT/RESET button must be released within three seconds of the odometer tESt display to begin the self-diagnostic mode. Press the SELECT/RESET button to advance through the following steps until dtc is displayed.

Depressing the SELECT/RESET button will display any stored continuous DTCs before proceeding to the next step.

Odometer Display Description
GAGE Activates gauge sweep of all gauges, then displays present gauge values. Also carries out the checksum tests on ROM and EE.
All segments illuminated Illuminates all odometer segments.
bulb Illuminates all micro-controlled indicators and LEDs. Install a new indicator or LED as necessary.
r Returns to normal operation of all micro-controlled indicators and LEDs and displays hexadecimal value for ROM level (used when requesting assistance from the hotline).
EE Displays hexadecimal value for EE level (used when requesting assistance from the hotline).
dt Displays hexadecimal coding of final manufacturing test date (used when requesting assistance from the hotline).
dtc Displays continuous DTCs in hexadecimal format. Pressing the SELECT/RESET button will display any DTCs stored before proceeding to the next step.
enG Displays the English speed in mph. Speedometer will indicate present speed within tolerances. Display will show 0 if input is not received, if input received is invalid for one second or more, or if speed is 0.
m Displays the metric speed data (km/h). Speedometer will indicate present speed within tolerances. Display will show 0 if input is not received, if input received is invalid for one second or more, or if speed is 0.
tAc Displays the tachometer data received from the PCM via the SCP network within tolerances. Tachometer will indicate present rpm. Display will show 0 if input is not received, if input received is invalid for one second or more, or if engine rpm is 0.
FUEL Displays the code (0-255) for the fuel sender input to the instrument cluster. The fuel gauge will display a filtered fuel level value. This filter will keep the pointer from moving suddenly or erratically.

  • 255 = open send +/- 0

  • 232 = full stop +/- 0

  • 215 = full mark +/- 10

  • 178 = 3/4 mark +/- 8

  • 138 = 1/2 mark +/- 7

  • 93 = 1/4 mark +/- 5

  • 41 = E mark +/- 4

  • 54=LOW FUEL (0-59)

  • 0-18=short (0-20 max)
OIL Displays the code (0-250) for the oil pressure switch input to the instrument cluster.

Oil pressure gauge will indicate present oil pressure. Normal oil pressure (greater than 6 psi) will display a value between 000 and 176. A low oil pressure or an inoperative engine oil pressure switch (less than 6 psi) will display a value greater than 176.
dEGC Display of engine temperature in degrees C input from cylinder head temperature sensor.

  • 49 C = "C" mark

  • 60 C = normal band start

  • 120 C = normal band end

  • -40 C = no SCP message for 5 seconds
bAtt Displays the code (0-255) for the battery voltage input to the instrument cluster.

Battery voltage gauge will indicate present battery voltage.

  • 93-102 = 6.9-9.1 volts (low voltage)

  • 115-124 = 8.5-10.7 volts (norm band start)

  • 215-225 = 15.8-18 volts (norm band end)

  • 230-241 = 16.9-19.1 volts (high voltage)
rhEo Displays the present decimal rheostat dimming input, 0-255 (used when requesting assistance from the hotline).
rhi

rhS

rho

 Not used.
Cr Displays the present RUN/START sense input. Display will show -h for high input with the ignition switch in the START position and -L for low input with the ignition switch in the RUN position.
PA-PE7 Not used.
GAGE Repeats test display cycle.

To exit the instrument cluster self-diagnostic mode, turn the ignition switch to the OFF position or press and hold the SELECT/RESET button for three or more seconds and release.

Instrument Cluster Diagnostic Trouble Code (DTC) Index

Diagnostic Tool Displayed DTC Self-Diagnostic Mode Displayed DTC Description Source Action
B1202 9202 Fuel Sender Open Circuit Instrument Cluster Go To Pinpoint Test B .
B1204 9204 Fuel Sender Short to Ground Instrument Cluster Go To Pinpoint Test B .
B1317 9317 Battery Voltage High Instrument Cluster Section
B1318 9318 Battery Voltage Low Instrument Cluster Section
B1342 9342 ECU is Defective Instrument Cluster INSTALL a new instrument cluster; REFER to Instrument Cluster in this section. TEST the system for normal operation.
B1343 9343 Heated Backlight Input Circuit Failure Instrument Cluster Section
B1356 9356 Ignition Run Circuit Open Instrument Cluster Go To Pinpoint Test A .
B1364 9364 Ignition Start Circuit Open Instrument Cluster Go To Pinpoint Test A .
B2143 A143 Odometer NVM Mmory Failure Instrument Cluster Go To Pinpoint Test J .
C1284 5284 Oil Pressure Switch Failure Instrument Cluster Go To Pinpoint Test C .
P1197 1197 Mileage Switch Circuit Failure Instrument Cluster Go To Pinpoint Test J .

GEM Diagnostic Trouble Code (DTC) Index

DTC Description Source
B1218 Horn Relay Coil Circuit Short to VBatt GEM
B1312 Lamp Headlamp Input Circuit Short to Battery GEM
B1317 Battery Voltage High GEM
B1318 Battery Voltage Low GEM
B1322 Driver Door Ajar Circuit Short to Ground GEM
B1330 Passenger Door Ajar Circuit Short to Ground GEM
B1334 Decklid Ajar Rear Door Circuit Short to Ground GEM
B1339 Chime Input Request Circuit Short to Battery GEM
B1340 Chime Input Request Circuit Short to Ground GEM
B1342 ECU is Defective GEM
B1353 Ignition Key-In Circuit Open GEM
B1359 Ignition Run/Acc Circuit Failure GEM
B1396 Power Door Lock Circuit Short to Battery GEM
B1397 Power Door Unlock Circuit Short to Battery GEM
B1405 Driver Power Window Down Circuit Short to Battery GEM
B1408 Driver Power Window Up Circuit Short to Battery GEM
B1426 Lamp Safety Belt Circuit Short to Battery GEM
B1428 Lamp Safety Belt Circuit Failure GEM
B1431 Wiper Brake/Run Relay Circuit Failure GEM
B1432 Wiper Brake/Run Relay Circuit Short to Battery GEM
B1434 Wiper Hi/Low Speed Relay Coil Circuit Failure GEM
B1436 Wiper Hi/Low Speed Relay Coil Circuit Short to Battery GEM
B1438 Wiper Mode Select Switch Circuit Failure GEM
B1441 Wiper Mode Select Switch Circuit Short to Ground GEM
B1446 Wiper Park Sense Circuit Failure GEM
B1448 Wiper Park Sense Circuit Short to Battery GEM
B1450 Wiper Wash/Delay Switch Circuit Failure GEM
B1453 Wiper Wash/Delay Switch Circuit Short to Ground GEM
B1458 Wiper Washer Pump Motor Relay Circuit Failure GEM
B1460 Wiper Washer Pump Motor Relay Coil Circuit Short to Battery GEM
B1462 Safety Belt Switch Circuit Failure GEM
B1466 Wiper Hi/Low Speed Not Switching GEM
B1473 Wiper Low Speed Circuit Motor Failure GEM
B1476 Wiper High Speed Circuit Motor Failure GEM
B1551 Decklid Release Circuit Failure GEM
B1553 Decklid Release Circuit Short to Battery GEM
B1555 Ignition Run/Start Circuit Failure GEM
B1687 Lamp Dome Input Circuit Short to Battery GEM
B2486 Parklamp Output Relay Driver Circuit Failure GEM
B2488 Parklamp Output Relay Driver Short to Battery GEM
C1189 Brake Fluid Level Sensor Input Short Circuit to Ground GEM
C1223 Lamp Brake Warning Output Circuit Failure GEM
C1225 Lamp Brake Warning Output Circuit Short to Battery GEM

Symptom Chart

Condition Possible Sources Action
  • No communication with the generic electronic module (GEM)
  • Central junction box (CJB) fuse (s):
  • 7 (15A).
  • 39 (5A).
  • 43 (20A).
  • Battery junction box (BJB) fuse 12 (40A).
  • Circuitry.
  • GEM.
  • Go To Pinpoint Test W
  • No communication with the instrument cluster
  • Central junction box (CJB) fuse (s):
  • 11 (15A).
  • 21 (5A).
  • 34 (20A).
  • Circuitry.
  • Standard corporate protocol (SCP) network.
  • Instrument cluster.
  • Go To Pinpoint Test A .
  • Incorrect fuel gauge indication
  • Circuitry.
  • Fuel pump module.
  • Instrument cluster.
  • Go To Pinpoint Test B .
  • Incorrect oil pressure gauge indication
  • Circuitry.
  • Engine oil pressure switch.
  • Instrument cluster.
  • Go To Pinpoint Test C .
  • Incorrect temperature gauge indication
  • Circuitry.
  • Engine coolant temperature sensor.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • Go To Pinpoint Test D .
  • Incorrect voltage gauge indication-except Cobra
  • Circuitry.
  • Generator.
  • Standard corporate protocol (SCP) network.
  • Instrument cluster.
  • Go To Pinpoint Test E .
  • Incorrect tachometer indication
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • Go To Pinpoint Test F .
  • Incorrect boost gauge indication-Cobra only
  • Pressure line.
  • Instrument cluster.
  • Go To Pinpoint Test G .
  • The LOW FUEL warning indicator is never/always on
  • LOW FUEL warning indicator bulb.
  • Standard corporate protocol (SCP) network.
  • Instrument cluster.
  • Go To Pinpoint Test H .
  • Oil gauge reads normal with engine off
  • Instrument cluster.
  • INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. TEST the system for normal operation.
  • The speedometer is inoperative
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • Go To Pinpoint Test I .
  • The odometer is inoperative
  • Circuitry.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • Go To Pinpoint Test J .
  • The safety belt warning indicator is inoperative (chime is operative)/does not operate correctly
  • Circuitry.
  • Generic electronic module (GEM).
  • Instrument cluster.
  • Go To Pinpoint Test K .
  • Inaccurate speedometer reading
  • Instrument cluster.
  • Powertrain control module (PCM).
  • Go To Pinpoint Test L .
  • The O/D OFF indicator is never on
  • Circuitry.
  • O/D cancel switch.
  • O/D OFF indicator bulb.
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • Go To Pinpoint Test M .
  • The O/D OFF indicator is always on
  • Circuitry.
  • O/D cancel switch.
  • Powertrain control module (PCM).
  • REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
  • The CHECK FUEL CAP INDICATOR is never on
  • Circuitry.
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • Go To Pinpoint Test N .
  • The CHECK FUEL CAP INDICATOR is always on
  • Circuitry.
  • Powertrain control module (PCM).
  • Fuel system.
  • REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
  • The BRAKE warning indicator is never/always on
  • Circuitry.
  • Low brake fluid level.
  • Brake fluid level switch.
  • Parking brake switch.
  • Instrument cluster.
  • Generic electronic module (GEM).
  • Go To Pinpoint Test O .
  • The charging system warning indicator is never/always on
  • Circuitry.
  • Generator.
  • Charging system warning indicator bulb.
  • Instrument cluster.
  • Go To Pinpoint Test P .
  • The high beam indicator is never/always on
  • Circuitry.
  • High beam indicator bulb.
  • Instrument cluster.
  • Go To Pinpoint Test Q .
  • The air bag warning indicator is never/always on
  • Circuitry.
  • Air bag warning indicator bulb.
  • Instrument cluster.
  • Restraint control module (RCM).
  • REFER to Section
  • The anti-lock brake system (ABS) warning indicator is never on
  • Circuitry.
  • ABS warning indicator bulb.
  • Anti-lock brake control module.
  • Instrument cluster.
  • Go To Pinpoint Test R .
  • The ABS warning indicator is always on
  • Circuitry.
  • Anti-lock brake control module
  • REFER to Section
  • The SERVICE ENGINE SOON indicator is never/always on
  • Circuitry.
  • SERVICE ENGINE SOON indicator bulb.
  • Powertrain control module (PCM).
  • Instrument cluster.
  • Go To Pinpoint Test S .
  • The turn/hazard indicator is never/always on
  • Circuitry.
  • Turn/hazard bulb(s).
  • Instrument cluster.
  • Go To Pinpoint Test T .
  • The THEFT indicator is never/always on
  • Circuitry.
  • THEFT indicator LED.
  • Instrument cluster.
  • REFER to Section
  • The traction control indicator is never/always on
  • Circuitry.
  • Traction control switch.
  • Standard corporate protocol (SCP) network.
  • Powertrain control module (PCM).
  • ABS module.
  • Instrument cluster.
  • Go To Pinpoint Test U .
  • The integrated circuit display is inoperative/erratic
  • Instrument cluster.
  • Go To Pinpoint Test V .
  • The instrument cluster is inoperative
  • Central junction box (CJB) fuse (s):
  • 11 (15A).
  • 21 (5A).
  • 34 (20A).
  • Circuitry.
  • Instrument cluster.
  • Go To Pinpoint Test V .
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