Acura CSX. Manual — part 211
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13-72
Reverse Lockout System
Component Location Index
ENGINE CONTROL MODULE (ECM)
REVERSE LOCKOUT SOLENOID
Test, page 13-77
Disassembly/Reassembly, page 13-77
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Vehicle speed
Inhibitor
Reverse selection
13-73
System Description
With 5th/6th selected
With reverse selected
Select lever
Change lever
Select lock
cam A
Select lock cam B
Select lock return spring
Direction of reverse selection
Locked position
Inhibitor OFF
At vehicle speeds of 20 km/h (12 mph) or more, the ECM, which monitors the signals from the output shaft
(countershaft) speed sensor, activates the reverse lockout solenoid, which pushes select lock cam B into the locked
position. As a result, the select lever cannot rotate to the reverse select position, making it impossible to engage
reverse gear. As the vehicle speed drops to 15 km/h (9 mph) or less, the ECM turns off the reverse lockout solenoid.
The select lock return spring pulls back select lock cam B, enabling the select lever to move freely so reverse gear can
be selected.
Above 20 km/h (12 mph)
ON
Not allowed
Below 15 km/h (9 mph)
OFF
Allowed
Ignition switch LOCK (0)
OFF
Allowed
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−
−
−
−
Driver can select reverse gear when vehicle
speed is 20 km/h (12 mph) or more
YES
NO
YES
NO
13-74
13-74
Reverse Lockout System
Circuit Diagram
Symptom Troubleshooting
GRN/BLK
YEL
1
2
BLK/YEL
BLU
IG1
BAT
WHT
BATTERY
UNDER-HOOD
FUSE/RELAY
BOX
IGNITION
SWITCH
IG1 HOT in ON (II)
and START (III)
UNDER-DASH
FUSE/RELAY
BOX
REVERSE
LOCKOUT
SOLENOID
No. 1
(100 A)
No. 3
(10 A)
No. 2
(50 A)
GRN
ECM
A27
RVS
NOTE:
• When checking if the transmission will shift to
reverse while the wheels are being driven forward,
raise the vehicle on a lift, make sure it is securely
supported, and allow the front wheels to rotate freely.
• Do not release the clutch pedal if you can select
reverse gear while the wheels are driven forward.
• When the vehicle is on a lift, and you make the
wheels rotate, turn off the VSA system by the VSA
OFF switch.
1. Turn the ignition switch to LOCK (0).
2. Check the No. 3 (10 A) fuse in the under-dash fuse/
relay box.
Reinstall the fuse, then go to step 3.
Install a new No. 3 (10 A) fuse, and recheck. If
the fuse continues to blow, check for short to body
ground in the wire between the No. 3 (10 A) fuse in
the under-dash fuse/relay box and the reverse
lockout solenoid.
3. Test-drive the vehicle.
4. Check for fuel and emissions system’s DTC with the
HDS.
Go to the indicated DTC’s troubleshooting.
Go to step 5.
Is the f use OK ?
Ar e ther e any DT Cs stor ed in the f uel and
emissions?
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−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
13-75
REVERSE LOCKOUT SOLENOID 2P CONNECTOR
IG1 (BLK/YEL)
ECM CONNECTOR A (44P)
RVS (GRN)
RVS (GRN/BLK)
REVERSE LOCKOUT SOLENOID 2P CONNECTOR
5. Turn the ignition switch to LOCK (0).
6. Disconnect the reverse lockout solenoid 2P
connector.
7. Turn the ignition switch to ON (II).
8. Measure the voltage between reverse lockout
solenoid 2P connector terminal No. 2 and body
ground.
Go to step 9.
Repair open in the wire between No. 3 (10 A)
fuse in the under-dash fuse/relay box and the
reverse lockout solenoid.
9. Turn the ignition switch to LOCK (0).
10. Jump the SCS line with the HDS.
11. Disconnect ECM connector A (44P).
12. Check for continuity between reverse lockout
solenoid 2P connector terminal No. 1 and ECM
connector A (44P) terminal No. 27.
Go to step 13.
Repair open in the wire between the reverse
lockout solenoid and the ECM.
13. Do the reverse lockout solenoid test (see page
13-77).
Check for loose terminals or poor
connections at the ECM. If necessary, update the
ECM if it does not have the latest software
(see page 11-227), or substitute a known-good ECM
(see page 11-7), then recheck. If the symptom goes
away with a known-good ECM, replace the original
ECM (see page 11-228).
Repair or replace the reverse lockout solenoid
(see page 13-77).
Wire side of female terminals
Terminal side of female terminals
Wire side of female terminals
Is ther e batter y voltage?
Is ther e continuity?
Is the r ever se lockout solenoid OK ?
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