What causes a GM car to have code 43?
What causes a GM car to have code 43?
Typical causes for this code 43 include: 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)
How does DTC 43 work on a GM Truck?
The DTC 43 circuit consists of a knock sensor with one wire that goes directly to the PCM. There are two DTC 43 checks performed by the PCM. One check consists of monitoring CKT 496 for a voltage that is more than 4.5 volts and less than .64 volt. If voltage is either too high or too low, for 10 or more seconds, DTC 43 will set.
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.
When to disconnect the knock sensor on a GM Truck?
If the voltage is 5V, disconnect and check the knock sensor if withing spec’s (3.9K) then you have a faulty connector at the sensor or an open on circuit 496, (this is the wire from the computer to the knock sensor),if out of spec’s then you have a faulty knock sensor.
Typical causes for this code 43 include: 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)
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
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 does the code 45 on a GM ECM mean?
This is the description of a Code 45 as set on GM products It is an indication of a rich mixture as indicated by the oxygen sensor readings. Circuit description: The ECM supplies a voltage of about .45 volts between the appropriate terminals of the sensor. (If measured with a ten megohm DVM, this may read as low as .32 volt).
What is the code 45 on a GM oxygen sensor?
This is the description of a Code 45 as set on GM products It is an indication of a rich mixture as indicated by the oxygen sensor readings. Circuit description: The ECM supplies a voltage of about .45 volts between the appropriate terminals of the sensor.
What are the diagnostic codes for a Chevy?
1 Refer to our Generic OBD II code list for definitions on all other Chevy diagnostic trouble codes. 2 Manufacturer Specific Codes 3 P0342 4 P1031 5 P1032 6 P1105 7 P1106 8 P1107 9 P1108 10 P1109
What are the trouble codes on a Chevy truck?
Watch the “check engine” light. It will start flashing. Chevy trouble codes are two digits. The first digit will be represented by a long flash. Secondary digits will be relayed through quicker flashes. For example, trouble code 16 will be relayed with one long flash and six short ones. Write the codes down as the “check engine” light sends them.
How to run a diagnostic test on a 1993 Chevy truck?
They will be on the end of the row to the far right, and the will be side by side. Place your key into the Chevy’s ignition and turn it, but don’t crank the engine. Watch the “check engine” light. It will start flashing. Chevy trouble codes are two digits. The first digit will be represented by a long flash.
This is the description of a Code 45 as set on GM products It is an indication of a rich mixture as indicated by the oxygen sensor readings. Circuit description: The ECM supplies a voltage of about .45 volts between the appropriate terminals of the sensor. (If measured with a ten megohm DVM, this may read as low as .32 volt).
When to use code 45 on a car?
Test description: 1.) Code 45 is set when the O2 sensor signal voltage remains above .7 volts for 30 seconds or more and in “closed loop”. 2.) Engine time after start is one minute or more. 3.) Throttle position between 2 % and 20 %. Diagnostic aides: 1.) The code 45 for rich exhaust is most likely caused by one or more of the following: a.
