P1664
Symptom: SHIFT UP lamp on continuously or out of
order.
SHIFT UP
Fault symptoms
SHIFT UP lamp on continuously or out of
order.
Conditions
P1664
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•
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Short circuit to ground/battery positive (B+).
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Diagnostic help
The SHIFT UP lamp can be activated with the ISAT scan tool.
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Select "SHIFT UP LAMP".
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The command activates the lamp at a frequency of 0.5 Hz for 30
seconds.
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 bulb
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Check whether the light bulb is
OK.
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Is the bulb OK?
Continue with point 2.
Change the light bulb. Continue with point
3.
2. Check the control module connection
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Unplug the main instrument display
panel's connector.
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Connect the test lamp to:
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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 "SHIFT UP LAMP".
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The test lamp should flash at a frequency of 0.5 Hz for 30
seconds.
Test lamp flashing?
Continue fault diagnosis as described in "electrical system, main instrument
display panel"
.
Check and if necessary repair or replace the lead between pin 39 of the main
instrument display panel's connector and pin 35 of the Motronic control module's
connector. Continue with 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.
