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Code 42 Vehicle speed sensor circuit fault. What this means is that the circuit has a problem, that can be the VSS or it can be anywhere in the wiring or even the ECM module. You need a scanner to directly see what is going on with the speed sensor signal output. That means a trip to a dealer or well equipped shop that has the correct scanner and knows Lexus repair.
Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...
Clearing the codes is simple that is done by removing the fuse of the EFI from junction box 2 for 10 seconds. Make sure to remove the jumper wire and switch the key off before clearing the codes.
Here are some common Lexus vehicles 1990-1995 codes:
Code 12 and Code 13 Rpm signal circuit fault
Code 14 Igniter signal circuit fault
Code 16 ECT control signal fault
Code 21 and Code 28 Main oxygen sensor fault (for ES300; SC300 & GS300 models)
Code 22 Coolant temperature circuit fault
Code 24 Intake temperature sensor circuit fault
Code 25 and Code 26 Air fuel ratio fault (for ES300 & SC300 models)
Code 27 Sub-oxygen sensor circuit fault (for ES300 CA & GS300 models)
Code 31 Low airflow meter voltage (for ES300 and GS300 models)
Code 32 High airflow meter voltage (for ES300 model)
Code 35 Barometric pressure sensor circuit fault (for GS300 & SC300 models)
Code 41 and Code 47 Throttle position sensor circuit fault
Code 42 Vehicle speed sensor circuit fault
Code 43 Starter signal
Code 51 Switch condition signal fault (for ES300; GS300 & SC300 models)
Code 52 Code 52 and Code 55 Knock sensor circuit fault
Code 71 EGR system circuit fault (for ES300; GS300 & SC300 models)
Code 78 Fuel pump control circuit fault (for GS300 & SC300 models)
On the 94 models there is a rectangular service connection box near battery lift lid and jumper te to e1 then turn key on (do not start car) watch the check engine light flash the first sequence is ten series and a pause then single digits next repeat then next code and keep going and will start over.
Does that doors' lock get any power when you hit the button to lock? You may have to check the wiring going to the door and search the internet to find out what wire gives power to the lock.
Your base ignition timing should be 10 deg. btdc.Make you a fused jumper wire and with the engine running jump terminals -te1 and e1.This will allow you to adjust base timing.Connect your timing light to spark plug wire number 1.Check your timing and adjust to 10 btdc if necessary.Good Luck!!!!
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