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Majority of these codes apply to most OBD Toyotas but some are related to the watercooled intercooler version of the 1GGTE

 

Code No.
System
Diagnosis
Trouble Area
11 ECU (+B) Wire severance, however slight, in +B (ECU)
Momentary power interruption to ECU 
(Generally you will find your ecu grounds have kaput, check the intake manifold grounds)
1. Main relay circuit
2. Main relay
3. ECU
12 RPM signal No G1,G2,Ne signal to ECU within several seconds after engine is cranked. 1. Distributor circuit
2. Distributor
3. Starter signal circuit
4. ECU
13 RPM signal No Ne signal to ECU within several seconds after engine reaches 1000 rpm. 1. Distributor circuit
2. Distributor
3. Starter signal circuit
4. ECU
14 Ignition signal No signal from igniters three times in succession 1. Igniter Circuit (+B, 1Gt, 1Gf)
2. Igniter
3. ECU
21 O2 sensor Engine reaches 1500 rpm and coolant is >50c for a period of time (engine temp stabilised) and O2 sensor shows lean for several seconds 1. Oxygen circuit (O2,V2)
2. O2 sensor
3. ECU
22 Water thermo sensor signal Open or short circuit in coolant temperature sensor 1. Coolant temp. circuit
2. Coolant temp. sensor
3. ECU
24 Intake air thermo sensor signal Open or short circuit in intake air temperature sensor 1. Air intake temp. circuit
2. Air intake temp sensor
3. ECU
31 Air flow meter signal Open circuit in E2 or Vc and E2 short circuited when idle points are closed 1. Air flow meter circuit
2. Air flow meter
3. ECU
32 Air flow meter signal Open circuit in E2 or Vc and Vs short circuited 1. Air flow meter circuit
2. Air flow meter
3. ECU
34 Over Boost (Air to Water Intercooler) Water temp. > 70c and high turbo boost has resulted in fuel cut (Note – This signal may appears instead of 31) 1. Over boost circuit
2. ECU
35 Pressure sensor Water temp. > 70c and low intake airflow and high boost pressure. 1. Pressure sensor circuit
2. Pressure sensor
3. ECU
41 Throttle position sensor Simultaneous IDL and PSW signal to ECU 1. Throttle position sensor circuit
2. Throttle position sensor
3. ECU
42 Vehicle speed sensor signal Signal informing ECU that vehicle speed is 2 km/h or less has been input to the ECU for 5 seconds with engine running at 3,000 rpm or more 1. Vehicle speed sensor circuit
2. Vehicle speed sensor
3. ECU
43 Starter signal (+B) No vehicle speed and no STA signal to ECU when engine is running over 800rpm 1. Main relay circuit
2. IG switch circuit (starter)
3. IG switch
4. ECU
51 Switch signal Air conditioning switch on or gear selector not in N or Pk during diagnostic check  
52 Knock sensor Engine at > 2000 rpm and no signal received from knock sensor 1. Knock sensor circuit
2. Knock sensor
3. ECU
54 Intercooler computer No signal received from water intercooler computer 1. Intercooler computer circuit
2. Intercooler computer
3. ECU

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