1997 Tacoma 2.7L 4x4. Cranks but will not start..

1997 Tacoma 2.7L 4x4. Cranks but will not start..

Read error codes
P0100- Mass Air Flow (MAF) sensor error
We replaced with NEW MAF sensor
P0120- Throttle Position Sensor Error
We replaced with NEW TPS Sensor
P0335- Crankshaft Position Sensor Error
We replaced with NEW CPS Sensor

Engine will crank but will not start...

What else could be the cause of NO start up....?????

 

Does it sound like its getting fuel and combusting? Or is it just turning?

 

Sounds like its getting fuel... But it just turns and turns.. Sprayed starter fluid into the throttle body... No start..

 

If these parts are not toyota parts you could be chasing your tail. Toyotas are finiky about aftermarket parts.

The first and easiest thing is to have someone crank the motor over while you mist some starting fluid into the intake. Do not spray it then crank it. If it starts then you know it has a fuel problem, if it doesnt then pull a spark plug and put it back in the coil/plug wire and ground it and have someone crank it over to see if you have spark. If no spark and she has a distributor, pop the cap and see if the distributor rotor turns when you crank it. If she does have a distributor these are a know issue.

 

Your issue is your p0335, Without a crankshaft position reading the truck will not start. Now seeing you also have other codes that arent part related I would guess you have a wiring problem. I would start with visually following the crankshaft wires back to the ecm. Go very slow and check very carefully. A nick in the insulation can cause corrosion inside the wire that you cant even see.

 

I have replaced and checked the ohm on the crank position sensor.. Reads correctly...
I replaced the spark plugs with 4 new ngk plugs.

Still no spark when i ground the plug.
1st coil runs plug 1 and 4
2nd coil runs plug 2 and 3

I tried on all 4 plugs with all 4 wires.. no spark from either coils.

 

Have you tried checking the crank sensor at the ecm? Or get a scan tool see what the crank sensor is sending to the ecu?

 

Trying to get a scan tool from my friend...And will look into check cam sensor at the ecm...

Do you have any links to check the crank sensor at the ecm..???

 

Sorry they're not the fancy digital photos but it should work.

 

Thank you for sending those photos. Im kinda rookie mechanic..These are very helpful..

When i check with multimeter these pins..... 11(E6) G and 5(E6) G- .....Also 12(E6) NE and 6(E6) NE-

Do i check for voltage changes when cranking..???

If i see changes in voltage... thats good..
If i don't see voltage changes....thats not good..

That Cam sensor i have NOT changed yet....

 

I put my multimeter on pins 5 and 11...cranked the engine... Voltage stared at 0.00 and changed to 0.02
Then put multimeter on pins 6 and 12...cranked the engine... voltage started at 0.00 and changed to 0.12
Not sure what i should be seeing....should it go from 0.00v to 5v..?????? on both..????

 

This likely isn’t helpful.

Not on a Toyota but on an Suzuki outboard.

It will throw a crank position sensor if it thinks it the motor should be running but it isn’t for other reasons. My issue was a neutral safety switch, and once fixed the crank position sensor code went away.

 

ok..After some google info... I believe i need to be checking for OHM not voltage on those pins...

I went and re checked pins 5 and 11 with OHMs and i see definite readings ohm values changing as a crank...
Then re checked pins 6 and 12 with OHMs and i see definite readomgs ohm values changing as a crank..

I think the Camshaft pos sensor maybe ok with those readings....

 

I would put one end on the crank sensor connector and the other end on the corresponding ecu pin. Set the multi meter to ohms. Check both wires and let us know what they read.

 

Crank Sensor has 3 wires...Cam Sensor has 2 wires....

Which one are you talking about...???

 

i checked ohm from pin1 on crankshaft to pin 12 (E6)....shorted out...
i checked ohm from pin2 on crankshaft to pin 6 (E6).....No Short...

see image

 

You want little to no resistance, ideally under 1 ohm. You are simply measuring the resistance of the wire from the crank sensor to the ecu. What exactly are your ohms on each wire?

 

Checked all 4 wires for both sensors....

all 4 read 00.4 ohms

 

Interesting. Might be time to grab the scan tool and see what it shows. Maybe the reluctor wheel the sensor reads is damaged.

 

i put the multimeter on pins 5 and 11 and cranked the engine and saw the fluctuation of resistance on the Camshaft sensor...
Also did the same for the Crank sensor.... Both gave fluctuation of ohms as i cranked engine....