I was having some problems with the check engine light comes on sometimes, so I borrowed my friends scantool, got a trouble code 43 ESC failure. Where is this sensor or module? I assume its under the cap and rotor. And few more question.......There is a chip in it but I don't know what kind is it just got the prom ID #0571. And last question check the TPS at .37v(idle) and 4.50v(WOT). Is this good? Thanks in advance

 

TPS setting should be .54v at idle.

Is your check engine light on when the engine is running? If it is not on, you may just have a residual code that was set. Your ESC module is on the firewall behind your fuel pump and maf relays. If the module is unplugged or bypassed (as if you were setting your timing), you would get a 43 and it would not go away until codes are cleared (disconnect battery to clear codes or use the ECM fuse).

If the light is on when engine running, check to make sure the ESC bypass wire is plugged in. It is located on the passenger side firewall harness. There will be a single weatherpack connector with a tan wire. This is what you disconnect to set base timing, then reconnect after you are done. Sometimes the tang can get broken on the connector, and it will come loose.

Hope that helps.

 

I borrowed my friends OTC and did a reset on the faulty codes and also did the battery disconnect, but the code 43 still came on, where is this ESC module located? Firewall pass. or driver's side? Thanks...............

 

And also it comes on and off while driving.

 

this is a pic that usually gets passed around on here for got who it belongs to.

 

E.S.T? Is this the Electronic Spark Control?

 

(E)lectronic (S)park (T)iming

 

Hmm? The OTC read ESC failure. Mines is a 92 Z28 with a 5.7 TPI


I just looked at my car no senor like that there.

 

Thats cause the ECM they are talking about is for the 85-89 cars. Yours doesn't have this module. It is built into the PROM.
The real cause of your code 43 is problably a bad knock sensor or the wire going to the knock sensor is disconnected there or broken. The PROM circuit rarely goes bad.

J

 

I been calling the dealer and local parts store and they could not find any ESC module. So a friend from a local parts store got me a ignition module. Whats the chances the ignition module goes bad? Should I chang it anyways? Thanks again.

Is the knock sensor and wire easy located from the engine compartment?

 

The chances that the ign. module is bad is ZERO. That would be a code 42....which is an EST (distr. module) problem.
Your problem is an ESC (E)lectronic (S)park (C)ontrol problem (aka knock sensor). The knock sensor is on the right (passenger) side of the engine in the middle of the block right above the oil pan. When you remove it some coolant will come out. Have the new on close by and stick it in fast.
First check for a loose connection before changing it.

J

 

I will do this tonight but have no new knock sensor inhand, I will do a update and will let you know whats up, if you don't mind. Thank-you very much..........

 

Set a voltmeter on the 1 volt scale and attach it to the sensor with the plug disconnected. Tap on the engine block near the sensor and see if the voltage goes above zero. If it does, the sensor is probably good. It could be an intermittant bad sensor. All it takes is 1/2 second for the sensor or connection to look bad (set code 43) to the ECM.

J

 

yeah, keep me posted. Midnight here though.....lights out. Good luck, J

 

Ok so I connect the other lead to ground and set the volt meter to 12v dc.

 

yes, other lead to ground. Setting vmeter to 12 vdc should work. When you tap on the block with a hammer you should see a voltage greater than zero (up to about 2 volts) depending on how hard you tap the engine.
Also, if you then disconnect the vmeter, connect the knock sensor. Turn on the key (don't start) you should see about 2.5 volts if you probe the knock sensor wire(without any tapping on the block).
Try this, but to me it sounds like a bad (oily/rusty) connection. Knock sensor do go bad though.

J

 

Ok sounds good! I going at it right NOW!

 

Ok did remove the plug to the knock sensor and some of the plastic of the plug fell appart but it shouldnt make the connection bad, connection looks good when the plug meet the knock sensor.

Ok check for voltage on the sensor use hammer hit block above the sensor nothing? The voltage reading did'nt move? Ok check the voltage on the hardness 4.9v when the key is turned on.

So whats next?

Also sensor is not loose.


And also did a test with the engine running and tapping the pass. exaust manifold, nothing no change in idle.

 

Sounds like the sensor is bad. With the wire connected it should read 2.5 V, not around 5 v. The sensor looks like an open circuit.
Make sure you get a sensor for a 1992 (your year). The older ones are different. Do a search on "Mike Davis + camaro" in a web search engine. He has the part number listed there.
J

 

Here is a link: http://www.eecis.udel.edu/~davis/z28/ecm_swap_730/

 

????? Was it a bad knock sensor or the wiring?

J

 

Seems like a bad knock or not? Sensor had crud that builded up from the dirty coolant and particals in the block that would had caused the troubles, metered (ohms) the knock sensor with the new one was the same, but would not be able to reuse the old one anyways.

But seems to be ok for the past two days, no trouble codes, checked timming and the idle seems to had improved.