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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
E1.3.3 DTC Failure Sub Type (Symptom) Definition Of FM/PWM Failures.
Table E6: DTC Failure Sub Type Definition for Failure Category “2”
Failure
Type
Sub
Type
FM/PWM (Frequency/Pulse Width Modulated) Failures
Note: 
This category includes faults related to Frequency Modulated (FM) and Pulse Width
Modulated (PWM) inputs and outputs of the ECU. This category also includes faults where
position is determined by counts.
Byte
Nibble 
Sub Type
(hex) (binary) 
Description
Definition
20
0000 reserved
21
0001 incorrect period
This sub type is used for failures where the ECU
measures an incorrect duration for one cycle of the
output.
22
0010 low time < minimum
This sub type is used for failures where the ECU detects
the low pulse is too narrow with respect to time.
23
0011 low time > maximum
This sub type is used for failures where the ECU detects
the low pulse is too wide with respect to time.
24
0100 high time < minimum
This sub type is used for failures where the ECU detects
the high pulse is too narrow with respect to time.
25
0101 high time > maximum
This sub type is used for failures where the ECU detects
the high pulse is too wide with respect to time.
26
0110 frequency too low
This sub type is used for failures where the ECU detects
too few cycles in a given time period.
27
0111 frequency too high
This sub type is used for failures where the ECU detects
too many cycles in a given time period.
28
1000 incorrect frequency
This sub type is used for failures where the ECU

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measures an incorrect number of cycles in a given time
period.
29
1001 too few pulses
This sub type is used for failures where the ECU
measures too few pulses (e.g., position is calibrated in
counts from one extreme to the other).
2A
1010 too many pulses
This sub type is used for failures where the ECU
measures too many pulses (e.g., position is calibrated in
counts from one extreme to the other).
2B
1011 missing reference
This sub type is used for failures where the ECU does
not detect a reference for a signal circuit or a group of
signal circuits.
2C
1100 reserved
Defined in previous revision of this specification as