P1610,P1611
Symptom: CHECK ENGINE lamp (MIL) on.
CHECK ENGINE request
Fault symptoms
CHECK ENGINE lamp (MIL) on.
Conditions
P1610 Short circuit to ground.
P1611 Open circuit.
Diagnostic help
The CHECK ENGINE request is a command from the transmission control module
(TCM) to the effect that the CHECK ENGINE lamp (MIL) should be turned on because an
emission related fault has occurred in the automatic transmission.
The status, "YES/NO", of the CHECK ENGINE request can be ascertained with the
ISAT scan tool.
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Select "CHECK ENGINE REQUEST".
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The CHECK ENGINE request can be activated via the TCM by means of the
ISAT scan tool.
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Select "AUT TRANSMISSION".
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If operation is correct, the CHECK ENGINE lamp (MIL) should light
up.
Check the wiring
Intermittent faults may occur as a result of temporary short circuits and breaks in the
wiring. Jiggle the wiring at several points and in different directions to ascertain whether the
wiring harness, including any connectors, is causing the trouble. Observe the multimeter,
ISAT scan tool or test lamp while doing this.
Diagnostic procedure
1. Check the wiring
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Check the lead for continuity
between:
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Is the lead OK?
Continue with point 2.
Rectify the fault. Continue with point 3.
2. Check the TCM output stage
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Turn the ignition switch to the
LOCK position.
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Unplug the Motronic control module connector.
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Connect the test lamp to the female connector between:
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Connect the ISAT Scan Tool.
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Turn the ignition switch to the ON position.
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Select "AUT TRANSMISSION".
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At ON, the test lamp should light up for 1 second.
Result OK?
Continue with point 3.
Continue fault diagnosis as described in Service Manual 4:2 "Automatic
transmission". Then carry out a final check as in point
3.
3. Final check
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Clear the diagnostic trouble
code.
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Implementation of driving cycle:
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Evaluation of driving cycle:
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Has the diagnostic trouble code recurred?
Continue as described in
.
The steps taken to rectify the fault were correct.
