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SERVICE MANUAL NUMBER 23
Clearing Trouble Codes
Clearing Codes Using Diagnostic Code Tool (Non-Scan)
NOTE: When clearing codes without the use of a scan tool, the battery must be fully
charged. The ability to clear codes is directly dependent on the battery being fully charged
and able to start the engine with adequate cranking RPM.
1. Install diagnostic code tool.
2. Turn key "ON."
3. Select "Service Mode" on code tool.
4. To clear codes, move the throttle, while in neutral, from 0% to 100% then back to 0%.
5. Exit "Service Mode" on code tool.
6. Start engine and let run for fifteen seconds.
7. Turn key "OFF" for 5 seconds.
8. Select "Service Mode" on code tool.
9. Turn key "ON" and read codes. If codes are still present, check preceding "Note" and
10. Refer to appropriate Troubleshooting and/or Diagnostic Charts.
A poorly charged battery or engine cranking problem may result in an ECM "reset" and may
not allow stored trouble codes to be cleared from EEPROM memory. If this condition exists,
BE SURE the battery is fully charged.
NOTE: If a low battery condition does exists the audio warning buzzer will come on for 2
seconds (as a result of an ECM reset) after engine start-up.
Clearing Codes Using Scan Tool (Scan)
1. Connect scan tool.
2. Start engine.
3. Select clear codes function.
4. Clear codes.
5. Turn key "OFF."
6. Turn key "ON" and read codes. If codes are still present, there is a real fault in system.
Index
90-861326--1 MARCH 1999
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repeat from Step 1.
Refer to appropriate Troubleshooting and/or Diagnostic Charts.
TROUBLE CODE DIAGNOSTICS - 7.4L MPI
Page 5G-3
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