SPONSORED LINKS

1989 GMC C2500 check engine light

Tiny
JEANNOTP
  • MEMBER
  • 1989 GMC C2500
Computer problem
1989 GMC C2500 V8 Two Wheel Drive Automatic

Hi guys,
I keep getting error codes 15 (low value of coolant temperature sensor), 24 (lean O2 sensor) and 44 (vehicle speed sensor) simultaneously, even after clearing the codes. I just need to drive 2 or 3 minutes, the Check engine light turns on, and the Actron OBDC scanner shows errors 15, 24 and 44 again.
I checked the voltage (5V) and resistor value (300 Ohms when hot) of the coolant temperature sensor, this is OK.
I checked the voltage on the single wire O2 sensor, and got 400mV when the engine is cold, and 100mV when it's hot. This looks normal as well according to a repair manual.
I didn't checked the vehicle speed sensor, but I can't see anything wrong on the speedometer while driving.
The ECM runs all the time in open loop.
One error code, OK, I could understand, but why the three of them? How to solve this problem?
SPONSORED LINKS
Saturday, April 3rd, 2010 AT 6:03 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check your battery to make sure it is in good shape. A poor battery can cause this. Also check the coolant sensor wire to see if the sensor has leaked antifreeze up the wire. That may have happened. Check al l the sensors for power to them and out. Alot of times it's just a poor connection.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, May 21st, 2010 AT 5:52 PM

Please login or register to post a reply.

Related Check Engine Light Content

Is it Safe to Drive Check Engine Light?
VIDEO
Is it Safe to Drive Check Engine Light?
Instructional repair video
Check Engine Light
GUIDE
Check Engine Light
Why is my check engine or service engine soon turned on? In this guide we talk about what this is associated with this notorious light, what it is used for and what you...
VIEW MORE

Sponsored links