10438204-10438203-10438208-10438209-10438206-10438202-10438205-10438207

COMPONENT LOCATION

GENERAL DESCRIPTION

The Wheel Speed Sensor (WSS) generates a waveform with a frequency proportional to the speed of the vehicle. The signal generated by the WSS informs the ECM not only if the vehicle speed is low or high but also if the vehicle is or is not moving. The ECM uses this signal to control the fuel injection, ignition timing, transaxle shift scheduling and torque converter clutch scheduling. The WSS signal is also used to detect rough road conditions.

DTC DESCRIPTION

Checking vehicle speed signal every from wheel speed sensor or ESC control every 30 sec. under detecting condition, if an signal is in the detecting condition for more than 20 sec., PCM sets P0501. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC DETECTING CONDITION

Item		Detecting Condition	Possible cause
DTC Strategy		● Detects the lack of vehicle speed signal	● Poor connection ● Open or short in harness ● Wheel speed sensor(FR) ● ESC control unit ● PCM
Enable Conditions	Case 1(Power)	● Engine Running ● No VSS disabling malfunction present ● No TPS fault present ● No MAP fault present ● 11V〈 Ignition Voltage〈 16V ● Engine Coolant Temperature 〉60℃ (140℉) ● MAP 〉55kPa ● 25% ≤ TPS ≤ 60% ● 1200rpm ≤ Engine Speed ≤ 4000rpm ● Vehicle Speed derived from transmission ≥ 10 kph (6.2 mph)
	Case 2(Decel)	● Engine Running ● No VSS disabling malfunction present ● No TPS fault present ● No MAP fault present ● 11V ＜ Ignition Voltage ＜ 16V ● Engine Coolant Temperature ＞ 60℃(140℉) ● MAP ＜ 32kPa ● TPS ＜ 1% ● 1800rpm ≤ Engine Speed ≤ 6000rpm ● Transmission in gear
Thresh old value	Case 1(Power)	● Vehicle Speed ≤ 10kph
	Case 2(Decel)	● Vehicle Speed ＜ 5kph ● Delta Engine Speed ≥ 100rpm
Diagnosis Time		● Continuous (More than 20 seconds failure for every 30 seconds test )
MIL On Condition		● 2 driving cycles

SIGNAL WAVEFROM AND DATA

SCHEMATIC DIAGRAM

MONITOR DTC STATUS

Check DTC Status

(1)

Connect scantool to Data Link Connector(DLC).

(2)

IG "ON".

(3)

Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC's information from the DTCs menu

(4)

Read "DTC Status" parameter.

(5)

Is parameter displayed "Present fault"?

▶ Go to "Terminal and connector inspection" procedure.

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

[EURO-Ⅲ/Ⅳ]

TERMINAL AND CONNECTOR INSPECTION

Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

▶ Go to " Signal Circuit Inspection " procedure.

SIGNAL CIRCUIT INSPECTION

note

This procedure is applied to vehicle with ABS (or ESP)

In case of no ABS(or ESP), refer to "C1203 Wheel speed sensor front-RH open/short".

Check short to ground in harness

(1)

IG "OFF"

(2)

Disconnect PCM connector and ESP control module connector.

(3)

Measure resistance between terminal 52 of PCM harness connector and chassis ground.

Specification : Infinite

(4)

Is the measured resistance within specifications?

▶ Go to "Check open in harness" as follows.

▶ Repair short to ground in harness, and go to "Verification of Vehicle Repair" procedure.

Check for open in harness

(1)

Ignition "OFF"

(2)

Disconnect PCM connector and ESP control module connector.

(3)

Measure resistance between terminal "52" of PCM harness connector and terminal "14(21)" of ABS/ESP control module harness connector.

Specification : Approx. below 1Ω

(4)

Is the measured resistance within specifications?

▶ Go to " Check wheel speed sensor " procedure.

▶ Check open in harenss.

▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.

Check wheel speed sensor

(1)

IG "OFF"

(2)

Check open or short in wheel speed sensor (Refer to "C1203 Wheel speed sensor front-RH open/short")

(3)

Is the wheel speed sensor normal?

▶ Substitute with a known - good PCM/ ESP control unit and check for proper operation.

▶ If the problem is corrected, replace PCM/ESP control unit and go to "Verification of Vehicle Repair" procedure.

▶ Repair or replace it as necessary.

▶ And then go to " Verification of Vehicle Repair" procedure.

note

There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. After testing PCM on the vehicle, use this function to reuse the PCM on the others

[Except EURO-Ⅲ/Ⅳ]

TERMINAL AND CONNECTOR INSPECTION

Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.

▶ Go to " Power Circuit Inspection " procedure.

POWER CIRCUIT INSPECTION

Check voltage

(1)

IG "OFF"

(2)

Disconnect vehicle speed sensor connector.

(3)

IG "ON" and ENG "OFF"

(4)

Measure voltage between terminal 1 of vehicle speed sensor harness connector and chassis ground.

Specification : Approx. 11.5 ~ 13V

(5)

Is the measured voltage within specifications?

▶ Go to "Signal circuit inspection" procedure.

▶ Repair open or short to ground in harness, and go to "Verification of Vehicle Repair" procedure.

▶ Especially Check the fuse related to Power for blown-off.

SIGNAL CIRCUIT INSPECTION

Check voltage from sensor side

(1)

IG "OFF"

(2)

Disconnect vehicle speed sensor connector.

(3)

IG "ON" and ENG "OFF"

(4)

Measure voltage between terminal 3 of vehicle speed sensor harness connector and chassis ground.

Specification : Approx. 8 ~ 11.5V

(5)

Is the measured voltage within specifications?

▶ Go to "Check voltae from PCM side" as follows.

▶ Repair open or short to ground in harness, and go to "Verification of Vehicle Repair" procedure.

Check voltage from PCM side

(1)

IG "OFF"

(2)

Disconnect PCM connector and vehicle speed sensor connector.

(3)

IG "ON" and ENG "OFF"

(4)

Measure voltage between terminal "52" of PCM harness connector and chassis ground.

Specification : Approx. 8 ~ 11.5V

(5)

Is the measured voltage within specifications?

▶ Go to " Ground circuit inspection " procedure.

▶ Check open in harenss.

▶ Repair or replace as necessary and then, go to " Verification of Vehicle Repair" procedure.

GROUND CIRCUIT INPECTION

IG "OFF"

Disconnect vehicle speed sensor connector.

IG "ON" and ENG "OFF"

Measure voltage between terminal 1 of vehicle speed sensor harness connector and chassis ground.(Fig.A)

Measure voltage between terminals 1 and 2 of vehicle speed sensor harness connector.(Fig.B)

Specification : Measurement "A" - Measurement 'B' = Approx. below 200mV

Is the measured voltage within specifications?

▶ Substitute with a known - good vehicle speed sensor and check for proper operation. If the problem is not correctd, substitute with a known - good PCM and check for proper operation. And go to "Verification of Vehicle Repair" procedure.

▶ Repair open or contact resistance in harness, and go to "Verification of Vehicle Repair" procedure.

note

VERIFICATION OF VEHICLE REPAIR

Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.

Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.

Read "DTC Status" parameter.

Is parameter displayed "History(Not Present) fault" ?

▶ System performing to specification at this time. Clear the DTC.

▶ Go to the applicable troubleshooting procedure.