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Honda ECU Diagnostic Trouble Codes B16a

Diagnostic Trouble Code (DTC)

System Indicated

Engine Control Module (ECM) 

Heated Oxygen Sensor (HO2S)

3

Manifold Absolute Pressure (MAP Sensor)

4

Crankshaft Position (CKP Sensor)

6

Engine Coolant Temperature (ECT Sensor)

7

Throttle Position (TP Sensor)

Top Dead Center Position (TDC Sensor)

9

No. 1 Cylinder Position (CYP Sensor)

10

Intake Air Temperature (IAT Sensor)

13

Barometric Pressure (BARO Sensor)

14

Idle Air Control (IAC Valve)

15

Ignition Output Signal

16

Fuel Injector

17

Vehicle Speed Sensor (VSS)

20

Electrical Load Detector (ELD)

21

Variable Valve Timing & Valve Lift Electronic Control Solenoid Valve (VTEC Solenoid Valve)

22

Variable Valve Timing & Valve Lift Electronic Control Pressure Switch (VTEC Pressure Switch)

23

Knock Sensor (KS)

30

A/T FI Signal A

31

A/T FI Signal B

41

Heated Oxygen Sensor (HO2S) Heater

43

Fuel Supply System

Obtaining ECU Error Codes

To determine if your ECU has an error code:

  1. Locate the ECU under the carpet in the passenger foot well.

  2. Find the red LED in the center of the ECU.

  3. Turn the ignition to ON. The red LED should flash once when this happens to indicate that the ECU has power.

  4. If there are no further flashes then there are no error codes.

  5. If there are further flashes then there are one or more error codes.

Honda ECU error codes

1 Oxygen Sensor "A" (Primary) defective circuit or unplugged / defective sensor

2 Oxygen Sensor "B" defective circuit or unplugged / defective sensor

3 MAP Sensor (Manifold Absolute Pressure) defective circuit or unplugged / defective sensor

4 CKP Sensor (Crankshaft Position Sensor) defective circuit or unplugged / defective sensor

5 MAP Sensor (Manifold Absolute Pressure) mechanical problem / disconnected piping

6 ECT Sensor (Engine Coolant Temperature) defective circuit or unplugged / defective sensor

7 TP Sensor (Throttle Position) defective circuit or unplugged / defective sensor

8 TDC Sensor (Top Dead Center) defective circuit or unplugged / defective sensor

9 CYP Sensor (Cylinder) defective circuit or unplugged / defective sensor

10 IAT Sensor (Intake Air Temperature) defective circuit or unplugged / defective sensor

12 EGR Lift Sensor (Exhaust Gas Recirculation) defective circuit or unplugged / defective sensor

13 BARO Sensor (Atmospheric Pressure) defective circuit or unplugged / defective sensor

14 IAC Valve (Idle Air Control) defective circuit or unplugged / defective sensor

15 Ignition Output Signal missing or defective ignition output signal

16 Fuel Injector System defective circuit or unplugged / defective fuel injector

17 VSS (Vehicle Speed Sensor) defective circuit or unplugged / defective sensor

19 Automatic Transmission Lock Up Control Solenoid Valve defective circuit or unplugged / defective solenoid valve

20 Electrical Load Detector defective circuit or unplugged / defective sensor

21 VTEC Solenoid Valve defective circuit or unplugged / defective solenoid valve

22 VTEC Oil Pressure Switch defective circuit or unplugged / defective oil pressure switch

23 KS (Knock Sensor) defective circuit or unplugged / defective sensor

30 Automatic Transmission Signal: "A" / SEAF / SEFA / TMA or TMB defective circuit or unplugged / defective sensor

31 Automatic Transmission Signal "B" defective circuit or unplugged / defective sensor

41 Primary Oxygen Sensor - Heater circuit malfunction

43 Fuel Supply System defective or malfunctioning fuel supply system

45 System Too Lean or Too Rich malfunction in the fuel monitoring systems

48 LAF Sensor (Lean Air Fuel) defective circuit or unplugged / defective sensor

54 CKF Sensor (Crankshaft Speed Fluctuation) defective circuit or unplugged / defective sensor

58 TDC Sensor 2 (Top Dead Center) defective circuit or unplugged / defective sensor

61 Oxygen Sensor, Heated - Sensor 1 (Primary) high voltage, low voltage, or slow response

63 Oxygen Sensor, Heated - Sensor 2 (Secondary) high voltage, low voltage, or slow response

65 Oxygen Sensor Heater (Secondary) malfunctioning or defective oxygen sensor heater

67 Catalyst system Efficiency Below Threshold malfunctioning or defective catalyst system

70 Automatic Transmission malfunction with the automatic transmission controls

71 Cylinder 1 Misfire or a Random Misfire a condition is present that is creating a cylinder misfire

72 Cylinder 2 Misfire or a Random Misfire a condition is present that is creating a cylinder misfire

73 Cylinder 3 Misfire or a Random Misfire a condition is present that is creating a cylinder misfire

74 Cylinder 4 Misfire or a Random Misfire a condition is present that is creating a cylinder misfire

75 Cylinder 5 Misfire or a Random Misfire a condition is present that is creating a cylinder misfire

76 Cylinder 6 Misfire or a Random Misfire a condition is present that is creating a cylinder misfire

80 Exhaust Gas Recirculation insufficient flow detected

86 ECT Sensor (Engine Coolant Temperature) circuit range / performance problem

90 Evaporative Emission Control System leak detected in the fuel tank area

91 Fuel Tank Pressure Sensor low input

92 Evaporative Emission Control System insufficient purge flow

 

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