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Eric, Automotive Repair Shop Manager
Category: Cadillac
Satisfied Customers: 32525
Experience:  20+ yrs. experience as repair shop manager and technician.
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how to reset and clear codes in 1993 allante

Customer Question

how to reset and clear codes in 1993 allante
Submitted: 8 years ago.
Category: Cadillac
Expert:  Eric replied 8 years ago.



Below is how to retreive the stored fault codes, code definitions and how to clear the codes and reset the computer- please remember that if you do not repair the problem correctly, the codes will reset and the check engine light will come back on:


Diagnostic Trouble Codes - 1993

E12 No Distributor Reference Signal
E13 Oxygen Sensor Not Ready
E14 Shorted Coolant Sensor
E15 Open Coolant Sensor
E16 Generator Voltage Out of Range
E19 Shorted Fuel Pump Circuit
E20 Open Fuel Pump Circuit
E21 Shorted Throttle Position Sensor
E22 Open Throttle Position Sensor
E23 EST Signal Problem
E24 Speed Sensor Circuit Problem
E26 Shorted Throttle Switch Circuit
E27 Open Throttle Switch Signal
E30 ISC RPM Out Of Range
E31 Shorted MAP Sensor Signal
E32 Open MAP Sensor Signal
E34 MAP Sensor Signal Out Of Range
E37 Shorted MAT Sensor Signal
E38 Open MAT Sensor Signal
E39 VCC Engagement Problem
E40 Power Steering Pressure Switch Signal
E41 Cam Sensor Signal Problem
E44 Oxygen Sensor Signal Lean
E45 Oxygen Sensor Signal Rich
E47 BCM to PCM/ECM Data Problem
E48 EGR System Problem
E52 PCM/ECM Memory Reset
E53 Distributor Signal Interrupt
E55 Closed Throttle Angle Out of Range
E58 Pass Key Control Problem
E60 Cruise - Not In Drive
E61 Cruise - Vent Solenoid Problem
E62 Cruise - Vacuum Solenoid Problem
E63 Cruise - Set Speed vs Vehicle Speed
E64 Cruise - Acceleration Too High
E65 Cruise - Servo Position Signal Problem
E66 Cruise - Engine RPM Too High
E67 Cruise - Switch Shorted
E68 Cruise - Command Problem
E70 Intermittent TPS
E71 Intermittent MAP
E73 Intermittent Coolant Sensor
E74 Intermittent MAT Sensor Signal
E75 Intermittent VSS Signal
E80 Fuel System Rich
E85 Idle Throttle Angle Too High
E90 Cruise - VCC Brake Switch Signal Problem
E91 Cruise - PRNDL Switch Problem
E92 Heated Windshield Request Problem
E96 Torque Converter Overstress
E97 P/N To D/R Engagement Problem
E98 P/N To D/R ISC Engaged Problem
E99 Cruise - Servo Apply Problem

To extract a trouble from the computer for diagnostic purposes, the Assembly Line Communication Link (ALDL) connector is used.

Ground terminals A and B with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A 12 consists of one flash, a short pause, then two flashes in rapid succession.

After 12 is displayed, any stored trouble s will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All s are displayed 3 times each then a 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.

ALDL Connector (Located Underdash)

The ALDL diagnostic connector is located in the passenger compartment.



Stored fault codes may be erased from memory at any time by removing power from the PCM for at least 30 seconds. It may be necessary to clear stored codes during diagnosis to check for any recurrence during a test drive, but the stored codes must be written down when retrieved. The codes may still be required for subsequent troubleshooting. Whenever a repair is complete, the stored codes must be erased and the vehicle test driven to confirm correct operation and repair.