Acura RL. Instruction — page 39

(countershaft) speed sensor and the input shaft (mainshaft) speed sensor, a malfunction is detected and a
DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

When the vehicle speed measured by the output shaft (countershaft) speed sensor is 13 mph (20 km/h) or
more, the vehicle speed measured by the input shaft (mainshaft) speed sensor is 1 mph (2 km/h) or less for
at least 10 seconds.

Driving Pattern

Start the engine, and drive the vehicle at a speed of 13 mph (20 km/h) or more for at least 10 seconds.

Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
PCM memory.

Conditions for clearing the MIL

Execution

Continuous

Sequence

None

Duration

10 seconds or more

DTC Type

One drive cycle, MIL ON, D indicator blinks

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery
voltage

11.0 V

Engine speed

500 rpm

Vehicle speed 13 mph (20 km/h)

Shift lever
position

D, D3

No active
DTCs

P0705, P0706, P0716, P0721, P0722, P0962, P0963, P0966, P0967, P0970, P0971,
P0973, P0974, P0976, P0977, P0979, P0980, P0982, P0983

Others

Not during shifting
Not when the shift lever is being shifted
No electrical noise in the output shaft (countershaft) speed sensor output circuit
Except 1st gear

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:04 PM

Page 153 © 2005 Mitchell Repair Information Company, LLC.

The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the
diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P0718 (15): ADVANCED DIAGNOSTICS

DTC P0718: INPUT SHAFT (MAINSHAFT) SPEED SENSOR INTERMITTENT FAILURE

Fig. 111: Input Shaft Speed Sensor — Circuit Diagram

Fig. 112: Vehicle Speed Graph

General Description

The input shaft (mainshaft) speed sensor is attached to the outside of the transmission housing. The input
shaft (mainshaft) speed sensor generates a pulsing signal according to the speed of the input shaft
(mainshaft) idler gear on the input shaft (mainshaft). Using that signal, the powertrain control module
(PCM) determines the speed of the input shaft (mainshaft). If no pulses occur with the input shaft
(mainshaft) rotating, the PCM detects a malfunction that may be caused by an open, a temporary open, or a
short to ground. Based on the fluctuation of the vehicle speed measured by the input shaft (mainshaft) speed
sensor, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:04 PM

Page 154 © 2005 Mitchell Repair Information Company, LLC.

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The fluctuation of the vehicle speed measured by the input shaft (mainshaft) speed sensor in 10 milliseconds
is 4 mph (6km/h) or more, and it fluctuates at least six times within 500 milliseconds.

Driving Pattern

Start the engine, and drive the vehicle at a speed of 13 mph (20 km/h) or more so it shifts from 1st to 5th in
the D position.

Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected during the first drive cycle, a Temporary DTC is stored in the PCM
memory. If the malfunction recurs during the next (second) drive cycle, the MIL comes on and the DTC and
the freeze frame data are stored.

Conditions for clearing the MIL

The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the
diagnostic runs.

The MIL, the DTC, the Temporary DTC, and the freeze frame data can be cleared by using the scan tool
Clear command or by disconnecting the battery.

DTC P0721 (9): ADVANCED DIAGNOSTICS

DTC P0721: PROBLEM IN OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR CIRCUIT

Execution

Continuous

Sequence

None

Duration

500 milliseconds

DTC Type

Two drive cycles, MIL ON, D indicator blinks

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Vehicle speed

13 mph (20 km/h)

Battery voltage 11.0 V

No active DTCs P0716, P0717, P0721, P0722

Others

Not during shifting
Not when an output shaft (countershaft) speed sensor intermittent failure is detected

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:04 PM

Page 155 © 2005 Mitchell Repair Information Company, LLC.

Fig. 113: Output Shaft Speed Sensor — Circuit Diagram

Fig. 114: Vehicle Speed Graph

General Description

The output shaft (countershaft) speed sensor is attached to the outside of the transmission housing. The
output shaft (countershaft) speed sensor generates a pulsing signal according to the speed of the park gear on
the output shaft (countershaft). Using that signal, the powertrain control module (PCM) determines the
speed of the output shaft (countershaft). If pulse dropouts occur with the output shaft (countershaft) rotating,
the PCM detects a malfunction that may be caused by an open, a temporary open, or a short to ground.
Based on the velocity ratio measured by the input shaft (mainshaft) speed sensor and the output shaft
(countershaft) speed sensor, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

MONITOR DESCRIPTION CHART

Execution

Continuous

Sequence

None

Duration

10 seconds or more

DTC Type

One drive cycle, MIL ON, D indicator blinks

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:04 PM

Page 156 © 2005 Mitchell Repair Information Company, LLC.

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