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Symptom: *CHECKING THE SPEED CONTROL OPERATION POSSIBLE CAUSES BRAKE SWITCH SIGNAL ECM DTC(S) PRESENT ENGINE CONTROL MODULE SPEED CONTROL SWITCH VSS SIGNAL INTERMITTENT CONDITION TEST ACTION APPLICABILITY 1 Turn the ignition on. t, read the ECM DTCs. Are there any ECM DTCs present? All Yes → Refer to symptom list for problems related to the ECM DTC. Perform SPEED CONTROL VERIFICATION - VER-4. No → Go To 2 2 Start the engine. t, read the S/C SWITCH VOLTS. Observe the S/C Switch volts on the DRBIII t while pressing and holding the S/C Switch lever in each position separately. All Yes → Go To 3 No → Refer to symptom list for problems related to the S/C Switch. Perform SPEED CONTROL VERIFICATION - VER-4. 3 Test drive the vehicle above 60 km/h (35 MPH). All Yes → Test Complete. No → Go To 4 4 Turn the ignition on. t in Sensors, read Vehicle Speed. Have an assistant drive the vehicle while you are observing the Vehicle Speed on the t. While observing vehicle speed on the DRBIII t, note any rapid changes (signal dropouts) in the reading that do not correspond with actual vehicle speed. t displaying an accurate vehicle speed? All Yes → Go To 5 No → Refer to symptom list for problems related to the Vehicle Speed Sensor. 236 DRIVEABILITY - DIESEL |