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So I have a check engine light that comes on soon after I start driving. It doesn't come on while running while parked. I've used the jumper wire technique to read the codes for my truck's check engine light. If I've done it correctly, (engine at operating temperature, clutch depressed), I came up with 558, 332, and 452.
According to my Chilton manual;
558 = EGR vacuum regulator circuit failure.
332 = Insufficient EGR flow detected
452 = Insufficient input from vehicle speed sensor
My truck is a 1991 F150, 4.9L, 5spd, 4x4.
I figure 452 is probably what is causing my light to come on since it only comes on when driving. I assume it's probably related to my speedometer not working as well. I don't know if the EGR codes are old stored codes or not. It looks like the previous owner may have replaced the EGR. I appreciate any help you guys can offer. Thanks.
For the 332 & 558 codes:
Continuous Memory Code 332 indicates that the EGR valve did not open with the engine stabilized and with EVR solenoid duty cycle present sometime during vehicle operation.
Possible cause:
-- Obstructed or cracked hose to EGR valve.
-- Damaged EGR valve.
-- Damaged EVR solenoid harness.
l Key off.
l Disconnect vacuum hose at EGR valve and connect a hand vacuum pump.
l Apply 10-20 in-Hg (34-67 kPa) to EGR valve.
l Does EGR valve open and maintain vacuum?
Service Code 558 indicates a failure in the EGR Vacuum Regulator (EVR) solenoid or circuit.
Possible causes are:
-- Damaged EVR solenoid.
-- Open harness circuit.
-- Shorted harness.
-- Damaged processor.
l Key off.
l Disconnect EVR solenoid.
l Measure EVR solenoid resistance.
l Is solenoid resistance between 25 and 70 ohms?
You should not have a 452 code with a 1991 truck.
The 452 code is with a truck that has a PSOM and a 1991 truck does not have one.
You may have the wrong PCM installed in the truck.
Continuous Memory Code 452 indicates that during the last 40 warm-up cycles, the processor detected an error in the PSOM output signal.
Possible Causes:
-- Damaged Rear Anti-Lock Brake System (RABS).
-- Damaged PSOM.
-- Damaged harness circuits.
-- Damaged processor.
l Key off.
l Disconnect processor 60-pin connector. Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
l Install breakout box, leave processor disconnected.
l Measure resistance between Test Pin 3 and Test Pin 6 at the breakout box.
l Is resistance between 21,000 and 55,000 ohms?
I appreciate all the feedback. I'm new to reading the codes on these trucks so it's entirely possible I read it wrong. I'll try to take a video of it and post the link so you all can review it.
Here is the link to the video I made of my light blinking. Please let me know if I wrote down the wrong codes. Again this was with a warm engine, and the clutch pedal depressed.
You are reading the codes correctly. The VSS is on the tailshaft of the transmission or transfer case and is what drives the speedometer cable. I would disconnect the cable and remove the VSS to check the speedometer drive and driven gears first. It still may be a wiring issue between there and the engine computer, but start there since the speedometer is also not working.
But I still do not understand why you would have three digit codes with a 4.9L engine and a standard transmission.
That set up should have two digit codes through 1994.
I would like to know the number on the PCM (EEC Computer) and the the calibration number on the "B" pillar sticker.
Here is a picture of the calibration tag. I don't know how or where to find the PCM number. I'll need some help with that. I've got to go to bed, (I work a 12hr night shift), but I should be back in about 8hrs or so. Thanks again for all of your help.
P.S. I also checked for codes with the engine running. It only blinked 3 times. Don't know if that means anything.
I don't know how or where to find the PCM number. I'll need some help with that.
As stated, it is on the computer. You would need to remove the computer to see the engineering number which can then be used to determine the part number.
As stated, it is on the computer. You would need to remove the computer to see the engineering number which can then be used to determine the part number.
Yes the computer may have to be removed from the drivers kick panel to read the engineering number. Attachment 280787
I wouldn't get too hung up on three vs. two digits, as I don't believe there was a hard and fast cutoff one model year to the next. The link I posted earlier stated that three digit codes first started appearing in 1991, and I'm pretty sure my dad's '92 F150 with six cylinder and 5-speed also uses three digit codes.
The three flashes you saw during the engine running test was the engine ID - six cylinder flashes three times, eight cylinder would flash four times. There will be a pause then a possible one flash goose code that prompts you to quickly stab and release the throttle, then another pause before actual codes are flashed. See here: EEC IV Self Test hookup . Have you had a chance to look for the VSS and speedometer cable?
Have you had a chance to look for the VSS and speedometer cable?
Unfortunately not yet. I'm in my work week now and I work 12hr shifts. I probably won't be able to get back to the truck until Saturday. I tend to try to spend some time with the family during my work week. However, if I do get back to my truck before Saturday, I'll update you guys. And as always, I really appreciate all of your all's help with this.
