CIRCUIT TEST DP - VEHICLE SPEED SENSOR (VSS)
Perform this test when directed by QUICK TEST. This CIRCUIT TEST is intended to diagnose:
" Vehicle Speed Sensor (VSS).
" VSS wiring harness circuits. (VSS+ and VSS-).
" Powertrain Control Module (PCM).
Fig. 35: VSS Circuit & Connector Terminals
Step 1) DTC P0500 This code indicates PCM detected incorrect output from VSS sometime during vehicle operation. Possible causes for this code are:
" Faulty VSS.
" Open or shorted circuit.
" Faulty PCM.
Turn ignition off. Disconnect VSS sensor. Remove PCM 104-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 58 and VSS (+) terminal at VSS wiring harness connector. Measure resistance between test pin No. 33 and VSS(-) terminal at VSS wiring harness connector. If resistance readings are less than 5 ohms, go to next step. If either resistance reading is 5 ohms or more, repair open circuit in VSS wiring harness. Clear PCM memory and go to step 27).
Step 2) Check VSS Circuits For Shorts To Power Or Ground Turn ignition off. Ensure PCM and VSS are disconnected. Measure resistance as follows:
" Between test pin No. 33 and test pin No. 58 and 71 (VPWR).
" Between test pin No. 58 and test pins No. 24, 61, 76 and 103 (PWR GND).
" Between test pin No. 58 and test pins No. 71 (VPWR) and 91 (SIG RTN).
If all readings are more than 500 ohms, go to next step. If any reading is 500 ohms or less, repair short in wiring harness. Clear PCM memory and go to step 27).
Step 3) Check VSS Resistance Turn ignition off. Disconnect VSS wiring harness connector. Measure resistance between VSS terminals. If resistance is not 190-250 ohms, replace VSS and go to step 27). If resistance is 190-250 ohms, replace PCM and go to step 27).
NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 5). No test procedures have been omitted.
I will email the whole document to you it will be in an xps format.
Wednesday, April 21st, 2010 AT 6:14 PM