DTC P0720:00 [FN4A-EL]

id050218817700

DTC P0720:00

VSS circuit malfunction

DETECTION CONDITION

•  The PCM detects no signal from the VSS when the following conditions are met.

―  Engine coolant temperature: more than 60 °C {140 °F}

―  D, S or L range

―  Turbine speed: more than 1,500 rpm

Diagnostic support note:

•  This is a continuous monitor (CCM).

•  The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.

•  The HOLD indicator light flashes.

•  PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.

•  FREEZE FRAME DATA is available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  VSS malfunction

•  Connector or terminal malfunction

•  Open circuit in wiring harness between VSS terminal A and main relay

•  Short to GND in wiring harness between VSS terminal A and main relay

•  Open circuit in wiring harness between VSS terminal B and PCM terminal 1AX

•  Short to power supply in wiring harness between VSS terminal B and PCM terminal 1AX

•  Short to GND in wiring harness between VSS terminal B and PCM terminal 1AX

•  Open circuit in wiring harness between VSS terminal C and body GND

•  PCM malfunction

DTC P0720:00	VSS circuit malfunction
DETECTION CONDITION	• The PCM detects no signal from the VSS when the following conditions are met. ― Engine coolant temperature: more than 60 °C {140 °F} ― D, S or L range ― Turbine speed: more than 1,500 rpm Diagnostic support note: • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • The HOLD indicator light flashes. • PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• VSS malfunction • Connector or terminal malfunction • Open circuit in wiring harness between VSS terminal A and main relay • Short to GND in wiring harness between VSS terminal A and main relay • Open circuit in wiring harness between VSS terminal B and PCM terminal 1AX • Short to power supply in wiring harness between VSS terminal B and PCM terminal 1AX • Short to GND in wiring harness between VSS terminal B and PCM terminal 1AX • Open circuit in wiring harness between VSS terminal C and body GND • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related repair Information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT VSS CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the VSS connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion) • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 11.
3		No	Go to the next step.
4	INSPECT VSS POWER CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the ON position (engine off). • Measure the voltage between VSS terminal A (wiring harness-side) and body GND. • Is the voltage B+?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 11.
5	INSPECT VSS CIRCUIT FOR SHORT TO GND • Turn the ignition switch off. • Inspect for continuity between the following circuits: ― VSS terminal A (wiring harness-side) and body GND ― VSS terminal B (wiring harness-side) and body GND • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to GND, then go to Step 11.
5		No	Go to the next step.
6	INSPECT VSS SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between VSS terminal B (wiring harness-side) and body GND. • Is the voltage B+?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 11.
6		No	Go to the next step.
7	INSPECT VSS GND CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between VSS terminal C (wiring harness-side) and body GND • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 11.
8	INSPECT VSS • Inspect the VSS. (See VEHICLE SPEED SENSOR (VSS) INSPECTION [FN4A-EL].) • Is there any malfunction?	Yes	Replace the VSS, then go to Step 11. (See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION [FN4A-EL].)
8		No	Go to the next step.
9	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion) • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 11.
9		No	Go to the next step.
10	INSPECT VSS CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between the VSS terminal B (wiring harness-side) and PCM terminal 1AX (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
10		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
11	VERIFY TROUBLESHOOTING OF DTC P0720:00 COMPLETED • Make sure to reconnect all the disconnected connectors. • Clear the DTC from the memory using the M-MDS. • Perform the following procedure to ensure that the DTC has been resolved: ― Warm up the engine. ― Shift the selector lever to D range. ― Drive the vehicle with turbine speed at more than 1,500 rpm for 5 s. • Is the PENDING CODE same as the DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE • Perform the “After Repair Procedure”. (See AFTER REPAIR PROCEDURE [FN4A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [FN4A-EL].)
12		No	DTC troubleshooting completed.