code read

13 - Engine Shutoff Solenoid Circuit

17 - High Resolution Circuit Fault

18 - Pump cam reference pulse error

19 - crankshaft position reference error

35 - injection pulse width error

36 - injection pulse with error

54 - PCM fuel circuit error

Also the service throttle light is on now. What on earth could cause all of these faults to come up at once??? Any help would be greatly appreciated. Thanks

This "freaks" the 'puter out, and sets all kinds of codes, as it "skews" the voltage the 'puter is seeing from a whole bunch of sensors.

Also, dirty, corroded, "bad" connections between the dual batteries will cause all kinds of trouble codes, as well.

Another thought... the engine shutdown solenoid shares a fuse (or fusible link, I can't recall) with the fuel heater, which is prone to shorting out. Disconnect the fuel heater (wires come out of the BOTTOM of the fuel filter, IIRC) and check ALL your fuses.

The engine shutdown solenoid is the silver cylindrical part with wires coming out the top protruding upwards near the top of this photo, on the upper left side. The "fuel solenoid", lower down, and to the right, in the photo IS under 'puter control, and closes, then opens EACH TIME the pump injects fuel.

The "Engine Shutdown Solenoid" is a simple solenoid with a plunger hanging downward that shuts off fuel flow to the pump and engine when the key is shut "OFF".

This solenoid is powered direct from the key, NOT through the electronics, as the rest of the pump is. Put your hand on the solenoid, and have someone turn on the key. You should hear and feel it snap "open". Don't mistake the "snap" of the glowplug relay at the back of the block for the "snap" of the engine shutdown solenoid! If is does NOT "snap" open, you'll need to find out why it's not being powered up when the key is turned "ON". RARELY, the solenoid itself will go bad. That solenoid simply screws into the pump, and nothing "magic" will jump out if you unscrew the shutdown solenoid.

The more I think about this, that first code PROBABLY tells a LOT about this problem... the 'puter is not seeing the voltage it expects being sent to the solenoid.

Do as I said with the fuel heater, check the fuses, and replace as needed, and let's get the shutdown solenoid to power up.

Post back, and let us know what you found out.

If you want LOTS of knowledgeable advice, check out the 6.5 section of "TheDieselPage.com". A search of the archives over there would turn up LOTS of information on a possible shorted fuel heater, or where all the grounds are.

You have to register to post on the message board there, and part of the site is "subscription only", but it's the best money you can spend as a 6.5 owner!

Here's what you have... the lift pump brings fuel up to the DS4. The DS4 has a built-in pump that flows the fuel though the engine shutdown solenoid, and on to the "hydraulic head".

There are 4 pumping pistons in the "hydraulic head" that force the fuel to, and through, the injectors. The other solenoid, the "fuel solenoid" MUST be commanded CLOSED by the 'puter at the instant the 'puter wants EACH AND EVERY injection event to begin. If there are "sick" sensors, a sick 'puter, bad wiring, a bad fuel solenoid driver, or a bad fuel solenoid, it will NOT close, and the fuel pumped by the plungers for EACH injection event will be "wasted" back into the pump housing, rather than forced through the injectors.

So, ASSUMING you have fuel to the IP, the internal pump is working, and the engine shutdown solenoid is working, you have internal pump problems OR external wiring/'puter problems leading to that solenoid not closing, and forcing the IP to build up injection pressure.

Trouble codes:

13 - Engine Shutoff Solenoid Circuit

---We've discussed this.

17 - High Resolution Circuit Fault.

---The "high resolution sensor" is another name for the "optical encoder", as shown in my first photo.

18 - Pump cam reference pulse error.

---This tells the 'puter at what position of advance the little servo motor (NOT shown in the photo, it's on the backside, in that view) has positioned the cam ring deep inside the pump that operates the 4 plungers previously mentioned.

19 - crankshaft position reference error

----The crankshaft position sensor is inserted at the lower left of the engine front cover.

35 - injection pulse width error

----Pertains to the operation of the "fuel solenoid".

36 - injection pulse with error

----Pertains to the operation of the "fuel solenoid".

54 - PCM fuel circuit error

---The 'puter is "freaked out" as to what is going on in the fuel system.

NOTE... besides all the grounds, check the connections between the engine harness and the body harness at the upper back of the motor.

Code readers/scanners will very seldom tell you what is wrong with the vehicle; that isn't it's purpose.

They only tell you what the computer has seen as "out of bounds" as far as the pre-set parameters go. It knows something is wrong, trips the light and sets the code, which your scanner then reads.

Therefore, it helps to have a good working knowledge of how any one particular outfit works.

What I'm saying is, don't just start throwing parts willy-nilly at the thing because you see a code set on your new $29 scanner.

Simple example: Both banks set O2 sensor "rich" codes. Doesn't mean that the sensors are bad; it only means that they are "seeing" a rich condition.

Tryin' to help,

Allan

I have a 1994 Chevy C1500 with a 6.5 naturally aspirated. It will not start. There is no fuel coming out of the injector lines. There is good fuel flow to the pump. From this forum we have for the most part determined that it is an electrical problem. I have tried several different pmds. I went and checked the fault codes and I was shocked to all of the numbers that came up. Here they are:

13 - Engine Shutoff Solenoid Circuit

17 - High Resolution Circuit Fault

18 - Pump cam reference pulse error

19 - crankshaft position reference error

35 - injection pulse width error

36 - injection pulse with error

54 - PCM fuel circuit error

Also the service throttle light is on now. What on earth could cause all of these faults to come up at once??? Any help would be greatly appreciated. Thanks