P1617

ROUGH ROAD SENSOR





Fault Symptom.
CHECK ENGINE lamp (MIL) on.

Conditions.
P1616
Current applied to the Motronic control module < 1.5 V.

P1617
Current applied to the Motronic control module 3.5 V.

Diagnostic Help.
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 sensor's ground connection and power supply

- Unplug the sensor's 3-pin connector.
- Turn the ignition switch to the ON position.
- Using a multimeter, take readings in the connector between:
^ pin 1 and battery negative (B-): about 5 V
^ Battery positive (B+) and pin 2: B+

Are the readings OK?

YES:
^ Change the sensor and continue with point 2.
NO:
^ Check the lead in question and repair or replace it if necessary. Continue with point 3.





2 Check the control module's sensor input

- Turn the ignition switch to the ON position.
- Using a multimeter, take a reading in the connector between:
^ pin 3 and battery negative (B-): about 5.5 V.

Is the reading OK?

YES:
^ Continue with point 3.
NO:
^ Check the lead and repair or replace it if necessary. Continue with point 3.





3 Final check

- Clear the diagnostic trouble code.
- Implementation of driving cycle:
^ Drive the car at varying engine loads and rpm for 5 minutes.
- Evaluation of driving cycle:
^ Check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?

YES:
^ Continue at "Before Replacing a Control Module". Component Tests and General Diagnostics
NO:
^ The steps taken to rectify the fault were correct.