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Please Help!!!

Truck has always run well without Check Engine Light (CEN). Recently, I pulled the fuse for the fuel pump (OM Fuse 10, pg. 173) and reinserted. Immediately, the CEN came on and the truck ran horribly. Also, the A/C fails to work, or should I say the Clutch won't engage. Went to AutoZone to pull codes, the "8" codes are as follows:

P0141, P0135, P0161, P0155, P0340, P1451, P1409, P0443

Checked the following (and have the Haynes Manual):

1. Engine/passenger compartment fuses ok;
2. A/C Clutch - Continuity=Yes;
3. A/C Hi & Lw Pressure switches - Continutity=Yes, Pwr=Yes;
4. Coolant pressure= Yes-Good, 90psi or better;
5. 2-O2 Sensors (Back)- Resistance check = 4.2 ohms respectively

Am also aware that the PCM may play a part in managing the A/C clutch.

Please advise, this poor truck needs help...!


Best Wishes, Eric
 

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Welcome Eric! Let's see what we have...

P0141 Oxygen Sensor Heater Circuit (Bank 1, Sensor 2)
P0135 Oxygen Sensor Heater Circuit (Bank 1, Sensor 1)
P0161 Oxygen Sensor Heater Circuit (Bank 2, Sensor 2)
P0155 Oxygen Sensor Heater Circuit (Bank 2, Sensor 1)
P0340 Camshaft Position Sensor A Circuit (Bank 1 Or Single Sensor)
P1451 EVAP System Vent Control Valve Circuit Malfunction
P1409 Electronic Vacuum Regulator Ctrl Circuit Malf
P0443 Evaporative Emission System Purge Control Valve Circuit

In looking at the 1997 (4.2L) schematic (not knowing what exact year of your truck and if it's early late model production of 1997), naturally it all goes back to the powertrain control module (PCM).

As much as I hate to say it, it sounds like you may have damaged the PCM (about $150-$200) in some way or something else has come undone.

First off, have you tried disconnecting the battery negative lead to reset the PCM? If so, I would recommend you go over everything with a fine toothed comb and ensure all the fuses are truly okay (I would disconnect the battery first) and nothing else has been inadvertently disconnected.

As for the clutch on the A/C, the black/yellow wire does go back to pin 41 of the PCM.

Mac
 
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