P1675
Symptom: None
Fuel pump relay, Check Engine or throttle position signal
Fault symptoms
None
Conditions
One of the control module's integrated circuit output stages is used for checking
the fuel pump relay, the CHECK ENGINE lamp (MIL) and the throttle position signal. Should
an intermittent fault, an open circuit or a short circuit to ground or battery positive (B+) occur
and the control module cannot determine the exact cause of the fault, diagnostic trouble code
P1675 will be generated. A CHECK ENGINE lamp (MIL) fault will normally cause P1691,
P1692 or P1693 to be generated but the fuel pump relay and throttle position signal have no
individual diagnostic trouble codes.
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 other Motronic 4.1 diagnostic trouble codes
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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 "READ FAULT
CODES".
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Does the ISAT scan tool show any of the following diagnostic trouble codes:
P1691, P1692 or P1693?
Continue fault diagnosis as described for the diagnostic trouble code in
question.
Continue with point 2.
2. Check the electric circuit
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Study and analyse the wiring
diagram. Check the ground connections and power supply (+15 circuit) or connectors in the
common circuit for the fuel pump relay and CHECK ENGINE lamp
(MIL).
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Has the cause of the fault been found?
Rectify the fault.
Continue fault diagnosis in accordance with the diagnostic procedure
described for P0601.
