DTC Status Bit Definitions
Refer to the following status bit descriptions:
Bit 7
- 0 - The ECU is not requesting warning indicator to be active
- 1 - The ECU is requesting warning indicator to be active
Bit 6
- 0 - The DTC test completed this monitoring cycle
- 1 - The DTC test has not completed this monitoring cycle
Bit 5
- 0 - The DTC test never failed since last code clear
- 1 - The DTC test failed at least once since last code clear
Bit 4
- 0 - The DTC test completed since the last code clear
- 1 - The DTC test not completed since the last code clear
Bit 3
- 0 - The DTC is not confirmed at the time of the request
- 1 - The DTC is confirmed at the time of the request
Bit 2
- 0 - The DTC was not failed on the current or previous monitoring cycle
- 1 - The DTC failed on the current or previous monitoring cycle
Bit 1
- 0 - The DTC never failed on the current monitoring cycle
- 1 - The DTC failed on the current monitoring cycle
Bit 0
- 0 - The DTC is not failed at the time of request
- 1 - The DTC is failed at the time of request
For DTCs that illuminate the MIL, a confirmed DTC means the PCM has stored a DTC and has illuminated the MIL. If the fault has corrected itself, the MIL may no longer be illuminated but the DTC still shows a confirmed status for 40 warm up cycles at which time the DTC is erased. Bit 7 can be used to determine if the MIL is illuminated for the DTC.
For DTCs that do not illuminate the MIL, a confirmed DTC means the PCM has stored a DTC. If the fault has corrected itself, the DTC still shows a confirmed status for 40 warm up cycles at which time the DTC is erased.
Determine if a test has completed and passed, for example, after a repair, information can be combined from tests as follows:
If bit 6 is 0 (the DTC test completed this monitoring cycle), and bit 1 is 0 (the DTC never failed on the current monitoring cycle), then the DTC has been evaluated at least once this drive cycle and was a pass.
If bit 6 is 0 (the DTC test completed this monitoring cycle) and bit 0 is 0 (the DTC is not failed at the time of request), then the most recent test result for that DTC was a pass.
The status byte bits can be decoded as a 2 digit hexadecimal number, and can be displayed as the last 2 digits of the DTC, for example for DTC P0110:1C-AF, AF represents the status byte info.
| Status Byte | |||||||
|---|---|---|---|---|---|---|---|
| A equals 1010 | F equals 1111 | ||||||
| Bit 7 equals 1 | Bit 6 equals 0 | Bit 5 equals 1 | Bit 4 equals 0 | Bit 3 equals 1 | Bit 2 equals 1 | Bit 1 equals 1 | Bit 0 equals 1 |