Code Help - Beginning Point

[branchscorpion]

At the onset I had a 335 code. This has been present since I bought the truck and known a replacement is necessary. Recent while out, the truck started acting up and the temperature gauge went to 0. No power and using fuel. When I scanned the codes, set aside from the previous 335 and a new 332 involving the same part, codes 211 and 116 appeared. PIP and Coolant Temperature Sensor. I would appreciate a suggestion as to where to start looking for the sudden problem. When purchased I did the usual tuneup, replaced wires, spark plugs, oil and filter, fuel filter, and air filter. Thank you for any suggestions......................................... John :us

 

[Runnin'OnEmpty]

At the onset I had a 335 code. This has been present since I bought the truck and known a replacement is necessary. Recent while out, the truck started acting up and the temperature gauge went to 0. No power and using fuel. When I scanned the codes, set aside from the previous 335 and a new 332 involving the same part, codes 211 and 116 appeared. PIP and Coolant Temperature Sensor. I would appreciate a suggestion as to where to start looking for the sudden problem. When purchased I did the usual tuneup, replaced wires, spark plugs, oil and filter, fuel filter, and air filter. Thank you for any suggestions......................................... John :us

Loss of PIP signal is usually caused by a faulty ICM
(Ignition Control Module). Does the tach read 1/2
engine RPM?

The ICM is located on the driver's side, bolted on the
lower part of the intake manifold.

Check that the wiring connector is secure on the coolant
temperature sensor. Your engine might have 2, one on or near
the thermostat housing, and maybe one on the driver's side
engine block (seen from below the vehicle).

Good luck.

 

[branchscorpion]

Thank you Runnin'OnEmpty. The tack is close to where it usually is, around 1000 RPM. I'll start as you suggested, in checking the connections to the ICM and proceed with the Coolant Temperature Sensors. Thank you much for your assistance.

 

[MrShorty]

Was the 116 a KOEO code (as opposed to a CM code -- see my notes on pulling EEC-IV codes for how to distinguish between the two codes)? Most common cause of a KOEO 116 is running the KOEO test on a cold engine. PCM expects to see the ECT above a certain threshold during the test.

The PIP signal, as noted, is generated by the ICM, based mostly on the CKP signal, I believe. I would probably start by checking power/ground to the ICM to make sure it isn't a simple wiring problem.

 

[branchscorpion]

Reply. MrShorty

Thank you for your assistance. The code 116 was received on a cold engine test. I use the Actron Code Scanner for EEC-IV. When the problem occurred, the temperature gauge pointer immediately went to no read. The engine ran rough, little power upgrade, and fuel consumption.

 

[MrShorty]

The code 116 was received on a cold engine test. I use the Actron Code Scanner for EEC-IV.

So we don't really know if the 116 is an important code or not. I would expect even an Actron Code Scanner should allow you distinguish between KOEO and CM codes (if it doesn't, I'd put it back in the toolbox and pull codes with a paper clip). Even if it doesn't help now, review the manual for the code scanner to learn how it distinguishes between KOEO and CM codes, as this may be important in diagnosing future issues. In this case, a CM 116 could suggest that the sudden temperature indication was a part of the original problem. A KOEO 116 is almost certainly merely a result of the test being performed on a cold engine (or, at least, that possibility can't be ruled out).

As noted earlier, many applications use a separate sender for the dash gauge. The operation of the dash gauge is often as dependent on the electrical wire as the sender itself, the sudden drop in the gauge could point to an electrical problem completely outside of the engine management system that is causing/contributing to the problem.

At the moment, I'm going to recommend looking at the temperature sender and ECT sensor. Gut feel, though, is that this is going to end up being something more fundamental in the trucks wiring (ignition switch/wiring, main power supplies/grounds, or something like that).

 

[branchscorpion]

Coolant temperature Sensor

Thank you MrShorty. I was going to try the paper clip method and decided to review the book as suggested to see what test it does. It is the KOEO. I'll warm the truck up tomorrow and redo the test to see if the code changes. We are having bad weather so working on it comes in spurts. Thank you for your advice and assistance. I'll follow the instructions given and see what I find. Have a great evening.