96 T&C OBD MIL Code 42?

[Frank]

The engine on our 96 T&C cuts out sporadically while driving. I read the
following codes out of the OBD:
12, 32, 61, 42. Codes 12, 32 and 61 seem unrelated to the problem at hand.
Which leaves me with 42.

The Haynes manual I have states that code 42 can indicate on of four
problems:
1) An open or shorted condition detected in the auto shutdown (ASD) relay
circuit
2) An open condition detected in the ASD Relay Output circuit
3) An open condition detected in the fuel pump relay control circuit
4) Open or short between PCM and fuel gauge sending unit.

I know for a fact that fuel level sensor is faulty, as the gauge bounces all
over the place when the tank is near full. So this would imply the 42 code
was indicating fault 4 above. However, what if more than one of the above
conditions existed? How would the OBD indicate that?

It would seem that the 42 codes related to the ASD are suspect since the ASD
energizes the injectors and coil (among other things). From what I've read,
the inputs to the PCM that control the ASD relay are the crankshaft and
camshaft position sensors. However I am not receiving any of the codes that
indicate a signal was not detected from either the camshaft or crankshaft
sensors.

I suppose I should fix the fuel level sensor, reset the codes and then see
what comes back. But the $450 price to replace the sending unit (which is
merely an annoyance) puts is low on my priority list. I'm going to be
driving this car on vacation this summer and need to get this fixed before
then.

Any ideas/suggestions?
thanks,
Frank

 

[mic canic]

guess what dude! a 61 code is map sensor fault and it does mean alot from that
code
since the baro reading's are taken from the map sensor i would be looking at the
engine wiring harness since you have asd codes

 

[Frank]

Thanks for the suggestion.
I did verify that the wiring is supplying the correct voltage to the MAP sensor, and that the ground is good. I haven't checked the actual voltage values at idle with the sensor in circuit yet to see if the sensor is faulty. But what affect does a bad MAP sensor have on the engine management? From other systems I've worked on (Bosch), a fault in this sensor would simply affect the mixture, but not cause the engine to totally shutdown instantly. Any idea on the price of a new MAP sensor?

thanks for any insight,
Frank

guess what dude! a 61 code is map sensor fault and it does mean alot from that code
since the baro reading's are taken from the map sensor i would be looking at the engine wiring harness since you have asd codes
Frank wrote:

The engine on our 96 T&C cuts out sporadically while driving. I read the
following codes out of the OBD:
12, 32, 61, 42. Codes 12, 32 and 61 seem unrelated to the problem at hand.
Which leaves me with 42.
The Haynes manual I have states that code 42 can indicate on of four
problems:
1) An open or shorted condition detected in the auto shutdown (ASD) relay
circuit
2) An open condition detected in the ASD Relay Output circuit
3) An open condition detected in the fuel pump relay control circuit
4) Open or short between PCM and fuel gauge sending unit.

I know for a fact that fuel level sensor is faulty, as the gauge bounces all
over the place when the tank is near full. So this would imply the 42 code
was indicating fault 4 above. However, what if more than one of the above
conditions existed? How would the OBD indicate that?

It would seem that the 42 codes related to the ASD are suspect since the ASD
energizes the injectors and coil (among other things). From what I've read,
the inputs to the PCM that control the ASD relay are the crankshaft and
camshaft position sensors. However I am not receiving any of the codes that
indicate a signal was not detected from either the camshaft or crankshaft
sensors.

I suppose I should fix the fuel level sensor, reset the codes and then see
what comes back. But the $450 price to replace the sending unit (which is
merely an annoyance) puts is low on my priority list. I'm going to be
driving this car on vacation this summer and need to get this fixed before
then.

Any ideas/suggestions?
thanks,
Frank