What is a secondary engine speed sensor?
What is a secondary engine speed sensor?
The secondary engine speed/timing sensor is used to determine when the piston in the No. 1 Cylinder is at the top of the compression stroke. When the timing has been established, the primary engine speed/timing sensor is then used to determine engine speed.
Why does my engine have trouble code 42?
Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system. During cranking, the timing is controlled by the ignition module while the ECM monitors the engine speed. When the engine speed exceeds 400 RPM, the ECM sends a BYPASS signal to the ignition module which switches the timing to ECM control.
What are the causes of a GM code 42 spark fault?
1) BYPASS line is open or grounded 2) EST line is open or grounded 3) PROM or CALPACK not seated properly in the ECM 4) Poor connections between ignition module and ECM 5) Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise) 6) Faulty or incorrect ignition module 7) Faulty ECM Return to Chart
What are the conditions for setting code 42?
The conditions for setting code 42 are: System in BYPASS mode but the ignition module is still controlling timing – or – Engine speed > 600 RPM with no EST pulses (ECM controlled timing) going to the ignition module for 200 msec. Typical causes for this code 43 include: 1) BYPASS line is open or grounded 2) EST line is open or grounded
What does the Code 42 on a GM car mean?
Trouble Codes› GM OBD Trouble Codes› GM Code 42 CODE 42 – Electronic Spark Timing or Bypass Fault Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system. During cranking, the timing is controlled by the ignition module while the ECM monitors the engine speed.
What are the fault codes for a caterpillar?
Caterpillar Fault Codes PID/SID FMI Fault Description 1 11 injector solenoid cyl#1 current below normal or open 2 11 injector solenoid cyl#2 current below normal or open 3 11 injector solenoid cyl#3 current below normal or open 4 11 injector solenoid cyl#4 current below normal or open
What happens when the primary engine timing sensor is lost?
If the engine is running and the signal from the primary engine speed/timing sensor is lost, a slight change in engine performance will be noticed when the ECM performs the changeover to the secondary engine speed/timing sensor.
Why does my truck have a flash code of 15?
The running cold problem is water regulators or the coolant diverter valve is stuck open. I’ve got a 2000 Freight. FL-70 with a flash code of 15 and have not been able to locate any info about it. Every month 400 people find a job with the help of TruckersReport.
How to know if your truck has a fault code?
That would be a code 12. blink=1 pause blink blink=2. If you had a “blink blink blink blink blink”, pause, “blink blink blink blink blink” = 55 mean no fault codes. Click to expand… What if it blinks 1 time every 5 seconds ? T/A tech says intake valve actuation system oil press volt high ???
