Infiniti M45 (Y34). Manual - part 70

DTC P1721 VEHICLE SPEED SENSOR MTR

AT-165

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DTC P1721 VEHICLE SPEED SENSOR MTR

PFP:24814

Description

ACS001CL

The vehicle speed sensor·MTR signal is transmitted from combination meter to TCM by CAN communication
line. The signal functions as an auxiliary device to the revolution sensor when it is malfunctioning. The TCM
will then use the vehicle speed sensor·MTR signal.

CONSULT-II Reference Value

ACS004PE

On Board Diagnosis Logic

ACS001CM

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This is not an OBD-II self-diagnostic item.

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Diagnostic trouble code “VHE SPD SE·MTR” with CONSULT-II is detected when TCM does not receive
the proper vehicle speed sensor MTR signal (input by CAN communication) from combination meter.

Possible Cause

ACS001CN

Harness or connectors
(The sensor circuit is open or shorted.)

DTC Confirmation Procedure

ACS001CO

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON. (Do not start engine.)

2.

Select “DATA MONITOR” mode for “A/T” with CONSULT-II.

3.

Start engine and maintain the following conditions for at least 5
consecutive seconds.
ACCELE POS: 1/8 or less
VHCL SPEED SE: 30 km/h (17 MPH) or more

4.

If DTC is detected, go to 

AT-166, "Diagnostic Procedure"

 .

Item name

Condition 

Display value

VHCL/S SE·MTR

During driving

Approximately matches the speedometer 
reading.

SAT014K

AT-166

DTC P1721 VEHICLE SPEED SENSOR MTR

Diagnostic Procedure

ACS001CP

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“A/T” with CONSULT-II.

3.

Drive vehicle and read out the value of “VHCL/S SE·MTR”.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

CHECK DTC, STEP 1

Check following items.

1.

Refer to 

AT-103, "DTC U1000 CAN COMMUNICATION LINE"

 .

2.

Refer to 

BRC-26, "CONSULT-II Functions"

 .

3.

Refer to 

DI-6, "COMBINATION METERS"

 .

OK or NG

OK

>> INSPECTION END

NG

>> If NG, recheck pin terminals for damage or loose connection with harness connector.

3. 

CHECK DTC, STEP 2

Perform DTC confirmation procedure. 

AT-165, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> If the system returns a malfunction, recheck pin terminals for damage or loose connection with

harness connector.

Item name

Condition 

Display value

VHCL/S SE·MTR

During driving

 Approximately matches 
the speedometer reading.

PCIA0033E

DTC P1730 A/T INTERLOCK

AT-167

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DTC P1730 A/T INTERLOCK

PFP:00000

Description

ACS001CQ

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Fail-safe function to detect interlock conditions.

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Fail-safe function to the transmission range switch detects the selector position and sends a signal to the
TCM.

On Board Diagnosis Logic

ACS001CR

●

This is an OBD-II self-diagnostic item.

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Diagnostic trouble code “A/T INTERLOCK” with CONSULT-II or P1730 without CONSULT-II is detected
when TCM does not receive the proper voltage signal from the sensor and switch.

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TCM monitors and compares gear position and conditions of each pressure switch when gear is steady.

Possible Cause

ACS001CS

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Harness or connectors
(The solenoid and switch circuit is open or shorted.)

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Low coast brake solenoid valve

●

ATF pressure switch 2

DTC Confirmation Procedure

ACS001CT

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON. (Do not start engine.)

2.

Select “DATA MONITOR” mode for “A/T” with CONSULT-II.

3.

Start engine.

4.

Drive vehicle and maintain the following conditions for at least 2
consecutive seconds.
Selector lever: “D” position 

5.

If DTC is detected, go to 

AT-172, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “With CONSULT-II”.

SAT014K

AT-168

DTC P1730 A/T INTERLOCK

Wiring Diagram — AT — I/LOCK

ACS001CU

TCWA0121E