P0072 P0073
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
P0072: Temperature sensor in mass air flow sensor, short to ground
P0073: Temperature sensor in mass air flow sensor, open circuit/short to B+
Fault symptom
On-Board Diagnostics
Type of diagnosis:
Enable criteria:
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Battery voltage should be 10.2-15.8 V
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Coolant temperature must exceed -10°C (valid for P0073)
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The following DTCs should not be detected,
P0072
: P0562, P0563
P0073:
P0562, P0563, P0116, P0117 and P0118.
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Fault criteria:
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P0072: Voltage on the input falls below 0.12 V for more than 0.3s.
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P0073: Voltage on the input exceeds 4.97 V for more than 0.3s.
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Dependents:
System reaction to a fault:
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The control module continues to work with a substitute value of 25°C
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OK report:
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Fault criteria not fulfilled
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Fault handling:
(See section
Fault handling III, other emissions-related components and functions
for more information)
Diagnostic help
Fault diagnosis focuses on electrical faults in the wiring and sensor. Diagnostic tool functions related to the fault: Read values: Temperature sensor in mass air flow sensor. See also description of read values under
"Read Values" menu
for more information.
Checking the wiring
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Check switches, connectors and crimp connections for oxidation, withdrawn pins and pin clamping force.
