SR20DET ECU Trouble Codes

ECU FAULT CODES

ECU_CODE_PULL

(You can see the screw on the left in the round hole and the LED on the right in the oval hole)

Long Flash - 0.6 seconds on (the first digit)
Short Flash - 0.3 seconds on (the second digit)
Long Gap - 2.1 seconds off (used between codes)
Short Gap - 0.9 seconds off (used between digits)

There’s a screw on the back of your ECU. Turn it counter-clockwise until it stops. Don’t keep trying to turn, it won’t get any harder and then stop. It’ll just stop. Then, turn the ignition key to on. Either your gauge cluster will flash, or the check engine light will flash. Count the long flashes, then the short flashes (only count how many times the light is ON), and you’ll have a 2 digit code. 

Note: Don’t forget to turn the screw clockwise again when you’re finished.


Code Meaning

11 – Camshaft Position Sensor

12 – Air Flow Meter

13 – Coolant Temperature Sensor

14 - Vehicle Speed Sensor

21 – Ignition Signal

25 – IACV – AAC Valve

26 - Boost Pressure Sensor

31 – ECM Fault

32 – Exhaust Gas Recirculation System

33 – Front EGO Sensor (O2-1 Sensor)

34 – Knock Sensor

35 – EGR Temperature Sensor

36 – EGR BPT Valve

37 – Closed Loop System

41 - Intake Air Temperature Sensor

43 - Throttle Position Sensor

54 – Signal from Auto Transmission

55 – Other Malfunction. CONSULT Terminal Required

65 – Cylinder 4 Misfire

66 – Cylinder 3 Misfire

67 – Cylinder 2 Misfire

68 – Cylinder 1 Misfire

71 – Random Misfire

72 – TW Catalyst System

76 – Fuel Injection System

77 – Rear EGO Sensor (O2-2)

82 - Crank Position Sensor

84 – Automatic Transmission Diagnostic Comms Line

95 – Crank Position Cog

98 – Coolant Temperature Sensor

103 – Park/Neutral Switch

105 – EGR Solenoid

111 – Inhibitor Switch

112 - Automatic Transmission Speed Sensor

113 – Automatic Transmission 1st Signal

114 – Automatic Transmission 2nd Signal

115 – Automatic Transmission 3rd Signal

116 – Automatic Transmission 4th Signal

118 - Automatic Transmission Shift Solenoid Valve A

121 - Automatic Transmission Shift Solenoid Valve B

123 – Automatic Transmission Overrun Clutch Solenoid Valve

124 – Automatic Transmission TOR Conv Solenoid Valve

125 – Automatic Transmission Line Pressure Solenoid

126 – Automatic Transmission Throttle Position Sensor

127 – Automatic Transmission Engine Speed Signal

128 – Automatic Transmission Fluid Temperature Sensor

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