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how to test a vehicle speed sensor on a 1996 ford explorer

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TRANSFER CASE BINDING OR SHUDDER DIAGNOSTICS VEHICLES WITH 4.0L ENGINE SERVICE TIP ISSUE to the Data Link Connector (DLC) underneath The diagnostic procedure for binding or shudder the steering wheel. Monitor for any Diagnostic from transfer case in slow, tight turns while in 4 Trouble Codes (DTCs) set by the transfer case Auto mode may be inaccurate for some vehicles. that could indicate incorrect speed sensor function. Codes could include, but are not ACTION limited to: Diagnose transfer case binding or shudder concerns using the following Diagnostic Procedure. •P1836 – Front propshaft sensor circuit failure •P1837 – Rear propshaft sensor circuit failure DIAGNOSTIC PROCEDURE •P1874 – Hall effect sensor power short circuit to battery 1997 EXPLORER •P1875 – Hall effect sensor power circuit 1. Test drive the vehicle in 4 Auto, 4 High and 4 failure Low. Evaluate the vehicle in each of these NOTE modes. The vehicle should bind in turns in both ADDITIONAL CODES COULD BE SET AS WELL. 4 High and 4 Low, but not in 4 Auto. The 4 PLEASE REFER TO THE APPROPRIATE YEAR High mode is intended for severe winter EXPLORER SERVICE MANUAL FOR COMPLETE weather or off-road driving only. It is not LISTING AND EXPLANATION. intended for use on dry or merely wet pavement. 3. If any of the DTCs in the above Step 2 are set, remove the corresponding speed sensor and 2. Verify the instrument panel has the proper 4X4 replace accordingly. Drive the vehicle to verify if selection label (Figure 1). Proceed to 1995-97 the shudder/binding has been eliminated. Send Explorer heading, Step 1. replaced speed sensor to the Ford Warranty 1995-97 EXPLORER Parts Return Center, Canton, MI. NOTE 4. Using NGS Tester, monitor the Parameter 4 AUTO IS THE FAR LEFT SWITCH POSITION Identification Display (PID) on the transfer case ON 1997 MODELS AND IS THE MIDDLE clutch duty cycle. If the 4 Auto mode reads POSITION ON 1996 MODELS. something higher than one (1), verify speed sensors have not set any Generic Electronic 1. If during test driving, the vehicle shudders or Module (GEM) DTCs and follow the speed binds in 4 Auto during slow forward or reverse sensor diagnostic procedure in the above Step parking lot maneuvers, proceed to Step 2. 2. Verify the following while checking PID: Mode Duty Cycle Indicator 4 Auto 0 or 1 4 High 13 4 Low 38 at 5 MPH 5. If the speed sensor circuits are functional, inspect for water contamination in the transfer case oil

1996 Pontiac Grand Am DTC P0502 Vehicle Speed Sensor (VSS) Circuit Low Input (3.1L VIN M) Service Manual

Action Taken When the DTC Sets Conditions for Clearing the MIL/DTC Diagnostic Aids Test Description The numbers below refer to the step numbers on the diagnostic table. 2. This step verifies that the PCM is receiving a signal from the vehicle speed sensor. 3. This step verifies that there are no opens in the circuitry from the vehicle speed sensor to the PCM connector. 7. This step performs a resistance test on the VSS circuits from the PCM connector. • The transmission defaults to 3rd gear. • The PCM inhibits TCC operation. • The PCM illuminates the Malfunction Indicator Lamp (MIL). • The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported. • A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported. • The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM. • Check for PRNDL DTC P0705. DTC P0705 affects transmission operation. This may set DTC P0502 falsely. • Check for Electromagnetic Interference (EMI) in circuits 400 and 401. EMI may be induced if the harness is routed along the spark plug wires. • Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring at the TCC brake switch. Look for the following conditions: – A bent terminal – A backed out terminal – A damaged terminal – Poor terminal tension – A chafed wire – A broken wire inside the insulation • When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change. • Ensure that the VSS is securely tightened to the case extension. DTC P0502 Vehicle Speed Sensor Circuit (VSS) Low Input

1996 Ford Taurus Camshaft Position Sensor removal and installation manual

REMOVAL CAUTION: Prior to removal of the Camshaft Position (CMP) sensor, set cylinder No.1 to zero degrees Top Dead Center (TDC) of compression stroke. Then note the position of the CMP sensor electrical connector. The installation procedure requires that the connector be located in the same position. 1. Disconnect battery ground cable. NOTE: When the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the Powertrain Control Module (PCM) relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 miles) or more to relearn the strategy. 2. Disconnect engine control sensor wiring connector from CMP sensor. 3. Remove retaining screws and CMP sensor from sensor housing. 4. If removing CMP sensor housing from the cylinder block, proceed with Removal Step 5. If not removing sensor housing, proceed to installation Step 6. 5. Remove hold-down clamp (bolt and washer assembly) . 6. Remove CMP sensor housing from cylinder block INSTALLATION CAUTION : A special service tool such as Syncro Positioning Tool T95T-12200-A must be obtained prior to installation of the replacement CMP sensor. Failure to follow this procedure will result in improper sensor alignment. This will result in the fuel system being out of time with the engine, possibly causing engine damage. 1. Attach Syncro Positioning Tool T95T-12200-A as follows: a. Engage CMP sensor housing vane into the radial slot of the tool. b. Rotate tool on CMP sensor housing until tool boss engages notch in sensor housing. 2. Pre-lubricate synchronizer gear with engine oil meeting Ford specification ESE-M2C123-A prior to assembly. 3. Install sensor housing so that drive gear engagement occurs when arrow on ocator tool is pointed approximately 75 degrees counterclockwise from the rear face of the cylinder block. This step will locate CMP sensor electrical connector in the pre-removal position. 4. Rotate Syncro Positioning Tool T95T-12200-A clockwise slightly. This will engage oil pump intermediate shaft. Push downward while adjusting Syncro Positioning Tool T95T-12200-A until the Syncro Gear engages the camshaft gear. 5. When synchronizer flange is fully seated against block, the installation tool should be facing counterclockwise of engine centerline approximately 33 to 45 degrees. 6. Install hold-down clamp (washer and bolt) and tighten bolt to 19-30 Nm (14- 22 lb ft)


DTC P0470 This DTC indicates PCM detected EBP sensor malfunction during KOEO ON-DEMAND SELF-TEST. Possible causes for this DTC are: Faulty EBP Sensor • Open Or Shorted Circuit • Faulty PCM • Ensure scan tool is connected to Data Link Connector (DLC). Using scan tool, select EBP PID from PID/DATA monitor menu. If EBP reading is less than 18.5 psi, clear DTCs. Repeat KOEO ON-DEMAND SELF-TEST . If DTC is still present, replace PCM. If EBP reading is 18.5 psi or more, go to next step. 2) Check Signal Ground Circuit Turn ignition off. Disconnect EBP sensor connector. Sensor is located on top front of engine. Inspect for damaged pins, corrosion and loose wires. Repair as necessary. Measure resistance between ground and Gray/Red wire at EBP sensor wiring harness connector. See Fig. 11 . If resistance is less than 5 ohms, replace EBP sensor. If resistance is 5 ohms or more, locate and repair open circuit in Gray/Red wire. 3) Continuous DTC P0470 This DTC indicates PCM detected a EBP sensor malfunction during normal driving conditions. Possible causes for this DTC are: Faulty EBP Sensor • Faulty Connection • Faulty PCM • Ensure scan tool is connected to Data Link Connector (DLC). Using scan tool, select EBP PID from PID/DATA monitor menu. While observing EBP PID, wiggle and bend small sections of wiring harness starting at EBP sensor connector and working toward PCM. If EBP reading fluctuates, isolate fault and repair as necessary. If reading does not fluctuate, go to next step. 4) Check Connector Disconnect EBP sensor connector. Sensor is located on top front of engine. Disconnect PCM 104-pin connector. Inspect connectors for damaged pins, corrosion and loose wires. Repair as necessary. Clear DTCs and repeat QUICK TEST . If both connectors are okay, no problem is indicted at this time. 5) DTC P0471 This DTC indicates PCM detected an EBP sensor malfunction during normal driving conditions and with EBP sensor enabled. Possible causes for this DTC are: Faulty EBP Sensor. • Plugged Or Restricted Sensor Supply Tube • Damaged Exhaust Pressure Regulator (EPR) Linkage Or Butterfly Damage • Faulty PCM • Perform KOER ON-DEMAND SELF-TEST . If any DTCs are present, repair fault(s) before continuing with this test. Using scan tool, select EBP PID from PID/DATA monitor menu. Road test vehicle performing hard accelerations while monitoring EBP PID. If EBP reading increases to more than 25 psi with EBP sensor on, no problem is indicated at this time. If EBP reading does not increase to more than 25 psi, go to next step


1999-2002 CHEVROLET SILVERADO 2000-2002 CHEVROLET TAHOE, SUBURBAN 2002 CHEVROLET AVALANCHE 1999-2002 GMC SIERRA 2000-2002 GMC YUKON, YUKON XL LOCATED IN THE SEVERE CORROSION AREAS LISTED BELOW Service Procedure The following procedure provides instructions for repairing a corrosion condition where the front wheel speed sensor mounts on the front wheel bearing assembly. 1. Raise the vehicle on a suitable hoist and support as necessary. 2. Remove both front tires and wheels. 3. Compress the front brake caliper pistons. 3.1. Install a large C-clamp over the top of the caliper housing and against the back of the outboard pad. 3.2. Slowly tighten the C-clamp until the pistons are pushed completely into the caliper bores. 3.3. Remove the C-clamp from the caliper. Important: It is not necessary to remove the front brake caliper from the bracket when removing the bracket in the next step. 4. Remove the two bolts that attach the front brake caliper mounting brackets to the knuckle. Notice: Support the brake caliper with heavy mechanic’s wire, or equivalent, whenever it is separated from its mount, and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak. 5. Remove the brake caliper and bracket as an assembly and support it with heavy mechanic’s wire or equivalent. DO NOT disconnect the hydraulic brake flexible hose from the caliper. 6. Mark the relationship of the rotor to the bearing hub. 7. If equipped, remove the rotor retaining push nuts from the wheel studs