P1240
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Engine runs unevenly.
Cruise control not working.
Starting problems, especially when engine is cold.
Throttle Motor Circuit. Shorted.
Fault symptom
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Cruise control not working.
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Starting problems, especially when engine is cold.
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On-Board Diagnostics
Type of diagnosis:
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Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.
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Enable criteria:
(Conditions that must be fulfilled before the diagnosis can be performed.)
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Ignition in ON position.
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Fault criteria:
(After enable criteria have been fulfilled, the diagnosis checks whether fault criteria are fulfilled.)
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Motor current exceeding 8A during the positive or negative section of the PWM period. Criteria fulfilled for 3 min.
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Dependents:
(Occasionally after fault criteria have been fulfilled, a number of other diagnostics must report OK before the trouble code can finally be generated.)
System reaction to a fault:
(After fault criteria have been fulfilled, certain measures will occasionally be taken.)
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Cruise control blocked.
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OK report:
(The diagnosis can be included as a dependent for another diagnosis and must therefore report OK even if it is continuous. The OK report is also used in fault handling to decrement the fault counter.)
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Accelerator pedal has been depressed at some time and then fully released. 120 s has expired since then without fault criteria being fulfilled.
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Fault handling:
(See “Fault diagnosis, general” for more information.)
Diagnostic help
This DTC is generated when the lead from control module pin 48 is shorted to B+.
Functions in the diagnostic tool related to the fault:
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Activation of output for throttle motor.
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See also the description of activating functions under ”Fault diagnosis, general” for more information.
Checking the wiring
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.
