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| '85-'89 PGM-FI '88-'90 PGM-CARB '90-'91 PGM-FI Clearing ECU codes |
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 For
a description and explanation of what the sensors are see the glossary! |
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ECU Error Codes
3rd generation ECU error codes and ECU
location. To access the codes (if any) turn the ignition key to the
on position but do not start the car. Locate the indicator LED and
count the number of flashes. Single digit codes are indicated by a
series of short flashes. Two digit codes use a long flash for the
first digit followed by the appropriate number of short flashes.
After a short pause the the code will repeat. For multiple codes the
codes will flash alternately with a pause between codes.
ie. For code 3 and 14....
The LED will flash 3 times, pause, flash once long then 4 times,
pause and repeat from the beginning.
On '85-'87 Preludes the ECU is located in the left side trim panel beside the rear seat. On '88-'91 Preludes the ECU is located under the carpet on the right passenger floorboard.
| Code 0 | ECU |
| Code 1 | Oxygen content A |
| Code 2 | Oxygen content B |
| Code 3 | MAP sensor |
| Code 4 | Crank angle sensor |
| Code 5 | MAP sensor |
| Code 6 | Coolant temperature |
| Code 7 | TPS sensor |
| Code 8 | TDC position sensor |
| Code 9 | No.1 cylinder position sensor |
| Code 10 | Intake air temperature sensor |
| Code11 | |
| Code 12 | Exhaust gas recirculation system |
| Code 13 | Atmospheric pressure sensor |
| Code 14 | Electronic idle control |
| Code 15 | Ignition output signal |
| Code 16 | Fuel injector |
| Code 17 | Vehicle speed sensor |
| Code 1 | Oxygen content |
| Code 2 | Vehicle speed pulser |
| Code 3 | MAP sensor, electrical signal |
| Code 4 | Vacuum switch signal |
| Code 5 | MAP sensor, vacuum signal |
| Code 6 | Coolant temperature |
| Code 7 | Clutch switch signal (manual trans.) |
| Code 7 | Shift position signal (auto trans.) |
| Code 8 | Ignition coil signal |
| Code 9 | Intake air temperature |
| Code 10 | Electronic Air Control Valve (EACV) |
| Code 0 | ECU |
| Code 1 | Oxygen content A *, Oxygen content ** |
| Code 2 | Oxygen Content B |
| Code 3 | MAP sensor |
| Code 4 | Crank angle sensor |
| Code 5 | MAP sensor |
| Code 6 | Coolant temperature |
| Code 7 | Throttle position sensor |
| Code 8 | TDC position sensor |
| Code 9 | No.1 cylinder position sensor |
| Code 10 | Intake air temperature sensor |
| Code11 | |
| Code 12 | Exhaust gas recirculation system |
| Code 13 | Atmospheric pressure sensor |
| Code 14 | Electronic air control |
| Code 15 | Ignition output signal |
| Code 16 | Fuel injector |
| Code 17 | Vehicle speed sensor |
| Code 41 ** | Oxygen sensor heater |
| Code 43 ** | Fuel supply system |
* 2.0 liter engines
** 2.1 liter engines
Stored codes are earased from memory by disconnecting power to the ECU for at least 30 seconds. Disconnecting the negative battery cable will clear the memory of the ECU, as well as other solid-state equipment such as radios. The ECU may also be cleared by pulling the appropriate fuse from the underhood fuse and relay box. This may be the BACK-UP, CLOCK or CLOCK/RADIO fuse.
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