Speed Control
Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.
Special Tool(s)
Inspection and Verification
Verify the customer concern.
Visually inspect for obvious signs of mechanical or electrical damage.
VISUAL INSPECTION CHART
MechanicalElectrical
Throttle lever
Battery junction box (BJB) fuse(s):
18 (20A)
38 (15A)
Circuitry
Powertrain control module (PCM)
If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
Verify the speedometer operates correctly without speed control by test driving the vehicle. If the speedometer does not operate correctly, refer to INFORMATION, GAUGES & WARNING DEVICES.
Verify the stoplamps operate correctly with the ignition switch in the OFF position. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING.
Verify the parking brake is not applied and is operating correctly. If the parking brake is not operating correctly, refer to BRAKE SYSTEM.
If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
check that the program card is correctly installed.
Check the connections to the vehicle.
Check the ignition switch position.
If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
CAN, ISO or UBP circuit fault; all electronic control units no response/not equipped, refer to MODULE COMMUNICATIONS NETWORK.
No response/not equipped for PCM, refer to MODULE COMMUNICATIONS NETWORK.
System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self test diagnostics for the PCM.
If the DTCs retrieved are related to the concern, go to the POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX.
If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART.
NOTE:DTC P0703 and DTC P1572 must be repaired before any other DTC.
Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) Index
POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX
DTCDescriptionSourceAction
P0500Vehicle Speed ErrorPCMREFER to ANTI-LOCK CONTROL.
P0579Cruise Control Multifunction Input A Circuit Range/PerformancePCMGo To PINPOINT TEST A.
P0581Cruise Control Multifunction Circuit HighPCMGo To PINPOINT TEST A.
P0703Brake On/Off FailurePCMREFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE.
P1572Brake On/Off FailurePCMREFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE.
Symptom Chart
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Thursday, March 18th, 2010 AT 7:27 AM
