...42 being the Electronic Spark Timing. The Electric Spark Timing Bypass curcuit or EST circuit is either grounded or open. A malfunctioning HEI module can cause this code so I suggest maybe trying to ...
...42- Electronic spark timing bypass circuit or EST circuit is grounded or open. A malfunctioning HEI module can cause this code. My truck does not have HEI ignition, but it does have a electronic ...
...42: 1. System in BYPASS mode (i.e. EST line supposedly grounded) but activity sensed on EST line 2. System in EST mode (i.e. BYPASS line driven with +5 volts) but no activity seen on the EST line ...
...42 means - electronic spark timing or bypass fault. this means that 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 ...
...42 Electronic Spark Timing or Bypass fault 43 Electronic Spark Control fault 44 Lean exhaust 45 Rich exhaust 46 VATS system fault 51 PROM fault 52 CALPAK fault 53 System over-voltage 54 Fuel pump ...
CODE 22 AND 42 Code 22 is the "throttle position sensor", and code 42 is "electronic spark timing or bypass fault".
...42" would indicate that the Electronic Spark Timing (EST) signal did not change when the ECM applied bypass voltage to the ignition module. Check for faulty connections, or a faulty ignition
42 has to do with your Electronic Spark Timing (EST) circuits that connect between the HEI module in the distributor and The Engine Control Module (ECM), as well as the Timing bypass connector. It can
...42 could be electronic spark timing circuit open or shorted to ground during engine run or direct igmition system bypass circuit open or shorted to ground during engine run or fuel cutoff relay ...
Question about GMC Cars & Trucks
...is code 42 and how do you fix it on a1992 gmc Sonoma 4.3 fuel injection Refer to the link for an explanation of the fault code 42 GM Code 42 Electronic Spark Timing or Bypass Fault ...
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