DTC 35 - Injection Pulse Width Error (Response Time Short): Notes

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

The fuel injector driver receives an inject command signal from the PCM and provides a current regulated output to the fuel solenoid that controls injection. It also returns an injection pulse width signal back to the PCM to inform it when the fuel solenoid has actually seated. This injection pulse width signal is measured in micro seconds. DTC 35 will set when:

Battery voltage is greater than 10 volts.
Engine coolant temperature is greater than 68°F (20°C).
Injection pulse width is less than 1.5 milliseconds.

PCM will default to a fixed injection pulse width value of 1.95.

NOTE: Test numbers refer to numbers on diagnostic chart.

This step determines if DTC 35 is the result of a hard failure or an intermittent condition.
This step checks for an open in the fuel inject signal circuit.