Diagnostic Trouble Codes - 1988
Honda
| 1 | Primary Oxygen Sensor (HO2S) (Sensor 1). |
| 2 | Rear Heated Oxygen Sensor. |
| 3 | Manifold Absolute Pressure Sensor (MAP). |
| 4 | Crankshaft Position Sensor (CKP). |
| 5 | Manifold Absolute Pressure Sensor (MAP). |
| 6 | Engine Coolant Temperature (ECT Sensor). |
| 7 | Throttle Position Sensor. |
| 8 | Top Dead Center Position Sensor (TDC). |
| 9 | No. 1 Cylinder Position Sensor (CYP). |
| 10 | Intake Air Temperature (IAT) Sensor. |
| 12 | Exhaust Gas Recirculation (EGR) System. |
| 13 | Barometric Pressure (BARO) Sensor |
| 14 | Idle Air Control (IAC) Valve. |
| 15 | Ignition Output Signal. |
| 17 | Vehicle Speed Sensor (VSS). |
| 18 | Ignition Timing Adjuster). |
PROCEDURE:
When the Check Engine warning light has been reported on, turn the ignition on, move the front passenger seat to the rear position and observe the LED on the front of the ECU. The LED indicates a system failure code by blinking frequency. The ECU LED can indicate any number of simultaneous component problems by blinking separate codes, one after another.
If Red LED indicates CODE 11, 16 or exceeds 18, count the number of blinks again, if the indicator is in fact blinking these codes, substitute a known-good ECU and recheck. If the indication goes away, replace the original ECU.