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Won't go into diagnostic mode

Good news a new ecu fixed the problem!
- Tyleranderson138
- Post #6
- Mar 26, 2021
- Forum: Engine Performance + Maintenance
T
Won't go into diagnostic mode

We've tried disconnecting the battery and wiping codes. All fuses are good, cig lighter has power, b terminal has 5 volts. It's only went into diagnostic mode once which is the only time it ran right. Other then that it will never go into diagnostic. We just grabbed a new ecu going to swap...
- Tyleranderson138
- Post #5
- Mar 26, 2021
- Forum: Engine Performance + Maintenance
T
Won't go into diagnostic mode

Also I checked and do have 5 volts at the b pin on the obd port
- Tyleranderson138
- Post #2
- Mar 25, 2021
- Forum: Engine Performance + Maintenance
T
Won't go into diagnostic mode

Hey everyone new to the forum hopefully I'm in the right spot. Working on a 1992 k2500 that I can not get to go in diagnostic mode to read the codes. The service engine soon light comes on but when I jump the A/B terminal on the obd1 it will not flash any codes. The truck is running like crap...
- Tyleranderson138
- Thread
- Mar 25, 2021
- Replies: 8
- Forum: Engine Performance + Maintenance