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Diagnostic Trouble Codes - 1988 Cadillac

 E012  No Distributor (Tach) Signal
 E013  Open Oxygen Sensor Circuit
 E014  Shorted Coolant Sensor Circuit
 E015  Open Coolant Temperature Sensor Circuit
 E016  Generator Voltage Out of Range
 E018  Open Crank Signal Circuit
 E019  Shorted Fuel Pump Circuit
 E020  Open Fuel Pump Circuit
 E021  Shorted Throttle Position Sensor Circuit
 E022  Open Throttle Position Sensor Circuit
 E023  EST Circuit Problem
 E024  Speed Sensor Circuit Problem
 E026  Shorted Throttle Switch
 E027  Open Throttle Switch Circuit
 E028  Open Third or Fourth Gear Circuit
 E030  Idle Speed Control Circuit
 E031  Shorted Manifold Absolute Pressure Sensor Circuit
 E032  Open Manifold Absolute Pressure Sensor Circuit
 E034  MAP Sensor Signal Too High
 E037  Shorted Manifold Air Temperature Sensor Circuit
 E038  Open Manifold Air Temperature Sensor Circuit
 E039  VCC Engagement Problem
 E040  Open Power Steering Pressure Circuit
 E044  Lean Exhaust Signal
 E045  Rich Exhaust Signal
 E047  BCM-ECM Data Problem
 E048  EGR System Fault
 E052  ECM Memory Reset
 E053  Distributor Signal Interrupt
 E055  TPS Misadjusted
 E058  Pass Key Fuel Enable Problem
 E059  VCC Temp Sensor Circuit
 E060  Cruise-Not In Drive
 E063  Set Speed/Vehicle Speed Higher than Set Speed
 E064  Acceleration Too High
 E065  Cruise Coolant Temp Too High
 E066  Cruise-Engine RPM Too High
 E067  Cruise Switch Shorted During Enable

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.

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