clem zahrobsky

where do i find a list of the check engine codes for a 1981 corvette?

PatsLs1vette

i dont know if this well help you let me know?
To pull codes, jumper pins A and B on the ALDL connector (upper right) and turn ignition switch to run position.

Code Circuit or System Probable Cause
12 No tach signal to ECM This code will flash whenever the diagnostic terminal is grounded with the ignition turned On and the engine not
running. If additional trouble codes are stored in the ECM they will appear after this code has flashed three times. If
this code appears while the engine is running, no reference pulses from the distributor are reaching the ECM.
13 Oxygen sensor Circuit Check for a sticking or misadjusted throttle position sensor. Check the wiring and connectors from the oxygen sensor.
Replace the oxygen sensor.
14 Coolant sensor/high temp If the engine is experiencing overheating problems the problem must be rectified before continuing. Check all wiring
and connectors associated with the coolant temperature sensor. Replace the coolant temperature sensor.
15 Cooland sensor/low temp See above, then check the wiring connections at the ECM
21 Throttle position sensor/high Check for a sticking or misadjusted TPS plunger. Check all wiring and connections between the TPS and the ECM.
Adjust or replace the TPS.
22 Throttle position sensor/low Check the TPS adjustment. Check the ECM connector. Replace the TPS.
23 Mixture control solenoid The mixture control solenoid is open or grounded.
24 Vehicle speed sensor A fault in this circuit should be indicated only when the vehicle is in motion. Disregard Code 24 if it is set when the
drive wheels are not turning. Check the connections at the ECM. Check the TPS setting.
32 BARO circuit low Barometric pressure sensor circuit low.
33 MAP Sensor Check the vacuum hoses from the MAP sensor. Check the electrical connections at the ECM. Replace MAP sensor.
34 Vacuum sensor or MAP sensor Code 34 will set when the signal voltage from the MAP sensor is too low. Instead the ECM will substitute a fixed MAP
value and use the TPS to control fuel delivery. Replace the MAP Sensor.
35 ISC valve Idle Speed Contro error. Replace the ISC.
41 EST circuit No distributor reference pulses to the ECM at specified engine vacuum.
42 Electronic Spark Timing Electronic Spark Timing bypass circuit or EST circuit is grounded or open. A bad HEI module can cause this code.
43 Electronic spark control unit The ESC retard signal has been on for too long or the system has failed a functional check.
44 Lean Exhaust Check the ECM wiring connections, particularly terminals 15 and 8. Check for vacuum leakage at the carb base
gasket, vacuum hoses or the intake manifold gasket. Replace the oxygen sensor.
45 Rich Exhaust Check the evaporative charcoal cansiter and it’s components for the presence of fuel. Replace the oxygen sensor.
51 PROM or MEM-CAL Make sure that the PROm or MEM-CAL is properly installed in the ECM. Replace the PROM or MEM-CAL.
52 CALPAK Check the CALPAK to insure proper installation. Replace the CALPAK.
53 EGR Valve Exhaust Gas Recirculation valve vacuum sensor has received improper EGR vacuum.
54 M/C solenoid The mixture control solenoid voltage is high at the ECM because of a shorted M/C solenoid circuit and/or faulty ECM.
55 ECM Be sure that the ECM ground connections are tight. If they are, replace the ECM.

Component replacement may not cure the problem in all cases where recommended. For this reason, you may want to seek professional advice before purchasing replacement parts.

clem zahrobsky

thank you sir for your prompt reply. i can not find my listing as i have not used it for years. :chevy

adam

The list of codes is also in the shop manual for that year.