Discussion:
K21/K25

Wont accellerate or rev.
Swapepd the ecm into another truck, ecm works fine in that truck.
any ideas?

pin 104 stays B+ and wont go negitive to activate the ETC relay
so pin 3 is 0v not B+
O2 sen voltage on pin 24 is high 6-10v
crank sensor pin 13 high 6.0v
cam sensor pin 14 high 2,5v
LPG inj pin 119 and 120 low 2.0v
acc pedal sen voltage high pin 91 5v

Any idea what drives pin 104 ?
  • Posted 29 Jan 2025 16:31
  • By john_andrews
  • joined 26 Jul'24 - 3 messages
  • California, United States
John A

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Fact of the week
According to studies published in the English Journal of Medicine, the impact of daylight savings is revealed by a 24% increase in heart attacks on the Monday following the spring shift forward. When clocks move back in autumn, heart attacks drop by about 21%, suggesting that loss of sleep is an important driver.