Skip the auto shop - Our mechanics make house calls

Q: Multiple trouble codes, no spark, no start.

asked by on

I have done a 1997 3.4 motor swap into my 1995 Toyota 4runner, had a wiring harness made by toy only swaps, got everything plugged in, motor cranks, has fuel but no spark. It is showing several trouble codes po 110, 100,115,120,335,340,758,773, the 758 and the 773 are to be expected because I am using an automatic ecu but had it repined to work with the manual trans or so I was told. I am not a mechanic nor do I claim to be but I know everything is plugged in and have verified that there is power to the coils, maf, injectors, igniter has power and is good, has fuel and my grounds are good, should I take the time to check each signal or assume the ecu or wiring harness is not doing what it should, any help would be appreciated.
My car has a manual transmission.

You are getting codes to each and every major sensor on the engine that is needed to run your motor. You either have a major malfunction with the ECU or a problem with the harness not being wired correctly. You will need to make sure that each wire, from each and every sensor input and computer output, is going to the correct pin in the harness connector to the ECM. You may need to ensure that the power and grounds from the vehicle to the new harness are the same on the 1995 and 1997 model. This is a pretty major job, it would take a mechanic hours to verify each and every connection. I’d suggest getting some help from a certified technician who can perform the necessary checks to diagnose the trouble codes and ensure that the motor operates properly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Multiple trouble codes, no spark, no start.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine light p0171

As you may know, his code is related to a lean fuel condition which is normally related to many of the items you have listed. I would recommend checking the injector pulses to be sure they are providing enough fuel...

Q: Transmission problem?

Hi There, This may be a result of low transmission fluid or potentially a faulty transmission control module. A faulty transmission control module may cause a delay in acceleration or erratic shifting of gears. The transmission control module has various...

Q: Car starts and runs perfectly for 3-4 minutes then stalls and won't restart for several hours.

Hi there. From the description you have provided, your vehicle's P0335 code is not being corrected by replacing components. Assuming, the replacement components are correct by application and of OEM (original equipment manufacturer) quality. It could be, the crankshaft reluctor...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.