Biltech Equipment
New member
Hi There Ty runs like shit, about the 31 are waiting for and ext Wastegate but 21 ?? How do I Correct this?? Please drop a mail If U Can Help me out.. Thanks
Code 31 And 21
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Biltech Equipment
New member
Anyone??
TYPHOOL7
Post Hawk
Trouble Codes Circuit or System Probable Cause
Code 12 No distributor referencepulses to the 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 then they will appear after this code has flashed 3 times. If this code appears while the engine is running, no reference pulses from the distributor are reaching the ECM.
Code 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.
Code 14 Coolant sensor/High temp If the engine is experiencing overheating problems the problem must be rectified before continuing. Check all wiring and connector associated with the coolant temperature sensor. Replace the coolant temperature sensor.
Code 15 Coolant sensor/Low temp See Above, then check the wiring connections at the ECM.
Code 21 Throttle position sensor/voltage 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. (see other instructions on doing this)
Code 22 Throttle position sensor/voltage low Check TPS adjustment. Check the ECM connector. Replace the TPS.
Code 23 MAT low temp indication Sets if the Manifold Air Temperature (MAT) sensor, connections or wires are open for 3 seconds.
Code 24 Vehicle speed sensor A fault in this circuit should be indicated only when the vehicle is in motion. Disregard if it is set when the drive wheels are not turning. Check the connections at the ECM. Check the TPS setting.
Code 25 ATI sensor/high air High temperature indication. Sets if the sensor or signal line becomes grounded for 3 seconds.
Code 31 Wastegate Overboost
Code 32 EGR Vacuum switch shortened to ground on start-up, switch not closed after the ECM has commanded the EGR for a specified period of time or the EGR solenoid circuit is open for a specified period of time. Replace the EGR valve.
Code 33 MAP sensor Check the vacuum hoses from the MAP sensor. Check the electrical connections at the ECM. Replace MAP sensor.
Code 34 Vacuum sensor orMAP sensor This 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.
Code 35 IAC valve Idle Air Control error. Code will set when closed throttle speed is 50 rpm above or below the correct idle speed for 30 seconds. Replace the IAC.
Code 42 Electronic Spark Timing(EST) This code is when this circuit is grounded or open. A malfunctioning HEI module can cause this code.
Code 43 Electronic Spark Control(ESC) The ESC retard signal has been on for too long or the system has failed a functional check.
Code 44 O2/Lean exhaust Check the ECM wiring connections, particularly terminals 8 and 15. Check for vacuum leakage at the TBI base gasket, vacuum hoses or the intake manifold gasket. Replace the oxygen sensor.
Code 45 O2/Rich exhaust Check the evaporative charcoal canister and its components for the presence of fuel. Replace the oxygen sensor.
Code 51 PROM or MEM-CAL Make sure the PROM or MEM-CAL is properly installed in the ECM. Replace the PROM or MEM-CAL.
Code 52 CALPAK Check the CALPAK to insure proper installation. Replace the CALPAK.
Code 53 System over-voltage (indicates a basic alternator problem) Check charging system.
Code 54 Fuel Pump Low fuel pump voltage. Sets when the fuel pump voltage is less than 2 volts when reference pulses are being received.
Code 55 ECM Be sure that the ECM ground connections are tight. If they are, replace the ECM.
i dont remember which site this is on but here, i reccommend cutting and pasting for your records, hope this helps some!
<font size=-1>[ This Message was edited by: TYPHOOL7 on 2002-03-17 18:55 ]</font>
Code 12 No distributor referencepulses to the 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 then they will appear after this code has flashed 3 times. If this code appears while the engine is running, no reference pulses from the distributor are reaching the ECM.
Code 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.
Code 14 Coolant sensor/High temp If the engine is experiencing overheating problems the problem must be rectified before continuing. Check all wiring and connector associated with the coolant temperature sensor. Replace the coolant temperature sensor.
Code 15 Coolant sensor/Low temp See Above, then check the wiring connections at the ECM.
Code 21 Throttle position sensor/voltage 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. (see other instructions on doing this)
Code 22 Throttle position sensor/voltage low Check TPS adjustment. Check the ECM connector. Replace the TPS.
Code 23 MAT low temp indication Sets if the Manifold Air Temperature (MAT) sensor, connections or wires are open for 3 seconds.
Code 24 Vehicle speed sensor A fault in this circuit should be indicated only when the vehicle is in motion. Disregard if it is set when the drive wheels are not turning. Check the connections at the ECM. Check the TPS setting.
Code 25 ATI sensor/high air High temperature indication. Sets if the sensor or signal line becomes grounded for 3 seconds.
Code 31 Wastegate Overboost
Code 32 EGR Vacuum switch shortened to ground on start-up, switch not closed after the ECM has commanded the EGR for a specified period of time or the EGR solenoid circuit is open for a specified period of time. Replace the EGR valve.
Code 33 MAP sensor Check the vacuum hoses from the MAP sensor. Check the electrical connections at the ECM. Replace MAP sensor.
Code 34 Vacuum sensor orMAP sensor This 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.
Code 35 IAC valve Idle Air Control error. Code will set when closed throttle speed is 50 rpm above or below the correct idle speed for 30 seconds. Replace the IAC.
Code 42 Electronic Spark Timing(EST) This code is when this circuit is grounded or open. A malfunctioning HEI module can cause this code.
Code 43 Electronic Spark Control(ESC) The ESC retard signal has been on for too long or the system has failed a functional check.
Code 44 O2/Lean exhaust Check the ECM wiring connections, particularly terminals 8 and 15. Check for vacuum leakage at the TBI base gasket, vacuum hoses or the intake manifold gasket. Replace the oxygen sensor.
Code 45 O2/Rich exhaust Check the evaporative charcoal canister and its components for the presence of fuel. Replace the oxygen sensor.
Code 51 PROM or MEM-CAL Make sure the PROM or MEM-CAL is properly installed in the ECM. Replace the PROM or MEM-CAL.
Code 52 CALPAK Check the CALPAK to insure proper installation. Replace the CALPAK.
Code 53 System over-voltage (indicates a basic alternator problem) Check charging system.
Code 54 Fuel Pump Low fuel pump voltage. Sets when the fuel pump voltage is less than 2 volts when reference pulses are being received.
Code 55 ECM Be sure that the ECM ground connections are tight. If they are, replace the ECM.
i dont remember which site this is on but here, i reccommend cutting and pasting for your records, hope this helps some!
<font size=-1>[ This Message was edited by: TYPHOOL7 on 2002-03-17 18:55 ]</font>
Biltech Equipment
New member
Thanks I Was Already Thinking About the TPS I Know How To Check The Function Of It But How Do I Adjust It..?