P0500,P0501, P0502
Symptom: SHIFT-UP lamp out of order. Fuel shut-off in all gears. Low boost pressure
in 3rd, 4th and 5th gears, manual gearbox. ABS warning lamp may be on.
Vehicle speed signal
Symptom of fault
SHIFT-UP lamp out of order. Fuel shut-off in all gears. Low boost pressure
in 3rd, 4th and 5th gears, manual gearbox. ABS warning lamp may be on.
Conditions
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P0500: All-embracing
DTC
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P0501: ignition switch in ON position.
vehicle speed >270 km/h.
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P0502: brake pedal not depressed.
engine speed >1800 rpm.
intake manifold pressure >60 kPa.
no vehicle speed signal for 4 seconds.
Above conditions fulfilled and then no vehicle speed signal for 17 minutes.
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Diagnostic help
A vehicle speed signal reading can be obtained on the ISAT scan tool.
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Select
"READ FUNCTIONS".
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The ISAT scan tool should show the current wheel speed. Drive the car and
compare the ISAT scan tool reading with the speed indicated on the speedometer.
Checking the wiring. Intermittent faults may occur as a result of occasional short circuits
and breaks in the wiring. Jiggle the leads and in-line connectors at several places and in
different directions to reveal faults in the wiring harness. Observe the multimeter, ISAT scan
tool or test lamp while carrying out this check.
Diagnostic procedure
1. Check the ABS diagnostic trouble codes
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Connect an ISAT scan tool.
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Ignition switch in ON
position.
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Obtain readouts of any diagnostic
trouble codes.
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Relevant diagnostic trouble codes for the RH front wheel sensor are B1376 and
B1377.
Is B1376 or B1377 present?
Continue fault diagnosis as described in Service Manual 5 "Brakes". Then carry
out a final check as in point 3.
Continue with point 2.
2. Check the wheel speed signal
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Jack up the front of the
car.
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Unplug the control module's
70-pin connector.
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Ignition switch in ON
position.
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Connect the test lamp to pins 39
and 1 of the female connector.
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Spin the RH front wheel.
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The test lamp should flash.
Does the test lamp flash?
Continue with point 3.
Check the lead between pin 7 of the ABS electronic control module and pin 39
of the Trionic electronic control module for shorting and continuity. If the lead is OK, continue
fault diagnosis as described in Service Manual 5 "Brakes".
3. Final check
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Clear the diagnostic trouble
code.
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Implementation of driving cycle:
Drive the car at varying engine rpm and loads for 5 minutes.
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Evaluation of driving
cycle:
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Connect an ISAT scan
tool.
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Select
"READ FUNCTIONS".
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Check that the ISAT scan tool
shows the same speed as the speedometer.
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Is the ISAT scan tool reading incorrect?
Proceed to
.
The remedial measure taken was correct.
