coolant ACURA CSX 2006 Service Owners Manual

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DTC P0420:
YES
NO YES
NO
YES
NO
11-353
DTC Troubleshooting
Catalyst System Efficiency Below
Threshold
NOTE:
 Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
 If some of the DTCs listed below are stored at the same time as DTC P0420, troubleshoot them first,
then recheck for DTC P0420.
P0137, P0138: Sec ondary HO2S (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
 Poor quality fuel may cause this DTC.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.
4. Test-drive under these conditions:  Engine coolant temperature (ECT SENSOR 1)above70°C(158°F)
 A/TinD,M/Tin5th
 Vehicle speed between 72 120 km/h (45 75 mph) for 5 minutes or more with cruise
control set
 K20Z2 engine: Maintain the vehicle speed at 88 km/h (55 mph) for 5 minutes or more with
cruise control set
 K20Z3 engine: Maintain the vehicle speed at 88 km/h (55 mph) for 30 seconds or more
5. Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.
Go to step 6.
If the screen indicates OUT OF CONDITION,
go to step 4 and recheck. If the screen indicates
PASSED, intermittent failure, the system is OK at
this time. If the screen indicates FAILED, go to step
8.
6. Continue test driving until a result comes on. 7. Monitor the OBD STATUS for DTC P0420 in the
DTCs MENU with the HDS.
Go to step 8.
If the screen indicates PASSED, intermittent
failure, the system is OK at this time. If the screen
indicates EXECUTING, keep driving until a result
comes on. If the screen indicates OUT OF
CONDITION, go to step 4 and recheck.
8. Turn the ignition switch to LOCK (0).
9. Replace the TWC (see page 11-355).
10. Turn the ignition switch to ON (II).
11. Reset the ECM/PCM with the HDS.
12. Do the ECM/PCM idle learn procedure (see page 11-310).
13. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.
14. Test-drive for about 10 minutes, varying the vehicle speed.
15. Check the CATA MONITOR CONDITION in the DATA LIST with the HDS.
Go to step 16.
Go to step 13 and recheck.
16. Test-drive under these conditions:  Engine coolant temperature (ECT SENSOR 1)above70°C(158°F)
 A/TinD,M/Tin5th
 K20Z2 engine: Vehicle speed at 88 km/h (55mph) for 5 minutes or more with cruise control set
 K20Z3 engine: Vehicle speed at 88 km/h (55mph) for 30 seconds or more
(cont’d)
Does t he scr een i nd i cat e E X E CU T IN G?Does t he scr een i nd i cat e F AILE D?
Is the condition OK ?
08/08/21 14:31:13 61SNR030_110_0353
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DYNOMITE -2009-

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DTC P0401:
YES
NO
YES
NO YES
NO
YES
NO
11-357
DTC Troubleshooting
EGR Insufficient Flow
NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.
4. Do the EGR TEST in the INSPECTION MENU with the HDS.
Go to step 5.
Go to step 7.
5. Test-drive under these conditions:  Engine coolant temperature (ECT SENSOR 1)above70°C(158°F)
 A/TinD,M/Tin4th
 Drive at a steady speed between 88 120 km/h (55 75 mph) for at least 10 seconds
 During the drive, decelerate (with the throttle fully closed) for 5 seconds
6. Monitor the OBD STATUS for DTC P0401 in the DTCs MENU with the HDS.
RemovetheEGRplate(seepage9-2),and
clean the intake manifold port with throttle plate
and induction cleaner, then go to step 9.
If the screen indicates PASSED, intermittent
failure, the system is OK at this time. Check for
poor connections or loose terminals at the EGR
valve and the ECM/PCM. If the screen indicates
EXECUTING, keep driving until a result comes on. If
the screen indicates OUT OF CONDITION, go to
step 5 and recheck. 7. Turn the ignition switch to LOCK (0).
8. Replace the EGR valve (see page 11-370).
9. Turn the ignition switch to ON (II).
10. Reset the ECM/PCM with the HDS.
11. Do the ECM/PCM idle learn procedure (see page 11-310).
12. Test-drive under these conditions:  Engine coolant temperature (ECT SENSOR 1)above70°C(158°F)
 A/TinD,M/Tin4th
 Drive at a steady speed between 88 120 km/h (55 75 mph) for at least 10 seconds
 During the drive, decelerate (with the throttle fully closed) for 5 seconds
13. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the EGR valve and the ECM/PCM. If the
connections are OK, go to step 15.
Go to step 14.
14. Monitor the OBD STATUS for DTC P0401 in the DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 13,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the EGR valve
and the ECM/PCM, then go to step 1. If the screen
indicates EXECUTING, keep driving until a result
comes on. If the screen indicates OUT OF
CONDITION, go to step 12.
(cont’d)
Is the result OK ?
Does t he scr een i nd i cat e F AILE D? Is DT C P0401 ind icated ?
Does t he scr een i nd i cat e PASSE D?
08/08/21 14:31:15 61SNR030_110_0357
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DYNOMITE -2009-

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YES
NO
YES
NO
YES
NO
YES
NO
DTC P0404:
11-35811-358EGR System
DTC Troubleshooting (cont’d)
EGR VALVE 6P CONNECTOR
SG2
EGRP
15. Update the ECM/PCM if it does not have the latest
software (see page 11-227), or substitute a known-
good ECM/PCM (see page 11-7).
16. Test-drive under these conditions:  Engine coolant temperature (ECT SENSOR 1)above70°C(158°F)
 A/TinD,M/Tin4th
 Drive at a steady speed between 88 120 km/h (55 75 mph) for at least 10 seconds
 During the drive, decelerate (with the throttle fully closed) for 5 seconds
17. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at the EGR valve and the ECM/PCM. If the
ECM/PCM was updated, substitute a known-good
ECM/PCM (see page 11-7), then go to step 16. If the
ECM/PCM was substituted, go to step 1.
Go to step 18.
18. Monitor the OBD STATUS for DTC P0401 in the DTCs MENU with the HDS.
If the ECM/PCM was updated,
troubleshooting is complete. If the ECM/PCM was
substituted, replace the original ECM/PCM
(see page 11-228). If any other Temporary DTCs or
DTCs were indicated in step 17, go to the indicated
DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the EGR valve
and the ECM/PCM. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see page 11-7),
then go to step 16. If the ECM/PCM was substituted,
go to step 1. If the screen indicates EXECUTING,
keep driving until a result comes on. If the screen
indicates OUT OF CONDITION, go to step 16. NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.
4. Do the EGR TEST in the INSPECTION MENU with the HDS.
Intermittent failure, the system is OK at this
time. Clean any carbon build-up on the EGR valve
with throttle plate and induction cleaner.
Go to step 5.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the EGR valve 6P connector.
7. At the EGR valve side, measure the resistance between EGR valve 6P connector terminals No. 1
and No. 2.
Go to step 25.
Go to step 8.EGR Valve Circuit Range/
Performance Problem
Terminal side of male terminals
I s DT Cs P0401 i nd i cat ed ?
Does t he scr een i nd i cat e PASSE D? Is the result OK ?
Is t her e 100 k or mor e?
08/08/21 14:31:16 61SNR030_110_0358
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Special Tools Required
13-7
Transmission Removal
A
B C
D
A A
B
A
B C
 Engine hanger adapter
VSB02C000015
 2006 Civic engine hanger VSB02C000025
 Engine support hanger, A and Reds AAR-T 1256
 Front subframe adapter VSB02C000016
These special tools are available through the Acura
Canada Technical Tools Department; FAX
866-398-8665/e-mail: ch_technicaltools ch.honda.com
NOTE: Use fender covers to avoid damaging painted
surfaces.
1. Do the battery removal procedure (see page 22-69).
2. Remove the cowl cover and the under-cowl panel (see page 20-163).
3. Remove the air cleaner assembly (see page 11-345).
4. Remove the harness clips (A) and the intake air duct (B), then remove the battery base (C) with the
coolant reservoir (D). 5. Remove the clutch line bracket (A), then carefully
move the slave cylinder (B) out of the way to avoid
bending the clutch line.
NOTE: Do not press the clutch pedal after the slave
cylinder has been moved.
6. Disconnect the back-up light switch connector (A), the output shaft (countershaft) speed sensor
connector (B), and the harness clips (C).
(cont’d)
08/08/21 14:44:19 61SNR030_130_0009
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13-21
A
B C
B
A 8x1.25mm
22 N·m (2.2 kgf·m, 16 lbf·ft)
6x1.0mm
9.8 N·m
(1.0 kgf·m,
7.2 lbf·ft)
(P/N 08798-9002) C
D B
C A
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
39. Connect the back-up light switch connector (A) and the output shaft (countershaft) speed sensor
connector (B). Install the harness clips (C).
40. Apply super high temp urea grease (P/N 08798-9002) to the end of the slave cylinder
pushrod. Install the slave cylinder (A), then install
the clutch line bracket (B). Be careful not to bend
the clutch line. 41. Install the battery base (A) with the coolant
reservoir (B).
42. Install the harness clips (C) and the intake air duct (D).
43. Install the air cleaner assembly (see page 11-345).
44. Do the battery installation procedure (see page 22-69).
45. Install the under-cowl panel and the cowl cover (see page 20-163).
46. Check the shift lever and the clutch operation.
47. Check the wheel alignment (see page 18-5).
48. Test-drive the vehicle.
08/08/21 14:44:55 61SNR030_130_0023
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DYNOMITE -2009-

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How to Troubleshoot Circuits at the ECM
Connectors
13-71
Reverse Lockout System
General Troubleshooting Information
A
E
A
D
B
C A
D
B
CA
NOTE: The ECM overwrites data and monitors the EVAP
system for up to 30 minutes after the ignition switch is
turned to LOCK (0). Jumping the SCS line after turning
the ignition switch to LOCK (0) cancels this function.
Disconnecting the ECM during this function, without
jumping the SCS line first, can damage the ECM.
1. Jump the SCS line with the HDS.
2. Remove the cover (A).
3. Lift up the under-hood fuse/relay box (D).
4. Remove the coolant reservoir (E). Disconnect ECM connectors A, B, and C.
NOTE: ECM connectors A, B, and C have symbols
(A= , B= , C= ) embossed on them for
identification. 5. When troubleshooting is done at the ECM
connector, use the terminal test port (A) above the
terminal you need to check.
6. Connect one side of the patch cord’s terminals (A) to a commercially available digital multimeter (B),
and connect the other side cord’s terminals (C) to a
commercially available banana jack (Pomona
Electronics Tool No. 3563 or equivalent) (D).
7. Gently contact the pin probe (male) at the terminal test port from the terminal side. Do not force the
tips into the terminals.
 For accurate results, always use the pin probe (male).
 To prevent damage to the c onnector
terminals, do not insert test equipment
probes, paper clips, or other substitutes as
they can damage the terminals. Damaged
terminals cause a poor connection and an
incorrect measurement.
 Do not puncture the insulation on a wire. Punctures can cause poor or intermittent
electrical connections.
08/08/21 14:46:38 61SNR030_130_0073
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DYNOMITE -2009-

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Special Tools Required
13-84
Manual Transmission
Transmission Removal
A
B C
D
A A
B
D
C
A
B
 Engine hanger adapter VSB02C000015
 2006 Civic engine hanger VSB02C000025
 Engine support hanger, A and Reds AAR-T 1256
 Front subframe adapter VSB02C000016
These special tools are available through the Acura
Canada Technical Tools Department; FAX
866-398-8665/e-mail: ch_technicaltools ch.honda.com
NOTE: Use fender covers to avoid damaging painted
surfaces.
1. Do the battery removal procedure (see page 22-69).
2. Remove the cowl cover and the under-cowl panel (see page 20-163).
3. Remove the air cleaner assembly (see page 11-345).
4. Remove the harness clips (A) and the intake air duct (B), then remove the battery base (C) with the
coolant reservoir (D). 5. Remove the clutch line bracket (A), then carefully
move the slave cylinder (B) out of the way to avoid
bending the clutch line.
NOTE: Do not press the clutch pedal after the slave
cylinder has been moved.
6. Disconnect the back-up light switch connector (A), the output shaft (countershaft) speed sensor
connector (B), the r everse lockout solenoid
connector (C), and the harness clips (D).
08/08/21 14:47:19 61SNR030_130_0086
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DYNOMITE -2009-



13-98Manual Transmission
Transmission Installation (cont’d)
6x1.0mm
9.8 N·m
(1.0 kgf·m,
7.2 lbf·ft)
8x1.25mm
22 N·m (2.2 kgf·m, 16 lbf·ft)
(P/N 08798-9002) B
A
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft) 6x1.0mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
6x1.0mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft) B
A
C
C
D
40. Apply super high temp urea grease (P/N 08798-
9002) to the end of the slave cylinder pushrod.
Install the slave cylinder (A), then install the clutch
line bracket (B). Be careful not to bend the clutch
line.
41. Install the battery base (A) with the coolant reservoir (B). 42. Install the harness clips (C) and the intake air duct
(D).
43. Install the air cleaner assembly (see page 11-345).
44. Do the battery installation procedure (see page 22-69).
45. Install the under-cowl panel and the cowl cover (see page 20-163).
46. Check the shift lever and the clutch operation.
47. Check the wheel alignment (see page 18-5).
48. Test-drive the vehicle.
08/08/21 14:47:31 61SNR030_130_0100
ProCarManuals.com
DYNOMITE -2009-

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How to Troubleshoot Circuits at the PCM
Connectors
14-5
A
D E
B
A
C A
D
B
C
A
NOTE: The PCM overwrites data and monitors the EVAP
system for about 30 minutes after the ignition switch is
turned to LOCK (0) or ACC (I). Jumping the SCS line
after turning the ignition switch to LOCK (0) or ACC (I)
cancels this function. Disconnecting the PCM during
this function, without jumping the SCS line first, can
damage the PCM.
1. Make sure the ignition switch is turned to LOCK (0), then jump the SCS line with the HDS.
2. Remove the cover (A).
3. Lift up the under-hood fuse/relay box (D).
4. Remove the coolant reservoir (E). Disconnect PCM connectors A, B, and C, and probe the terminals
from the terminal side of the connectors.
NOTE: PCM connectors A, B, and C have symbols
(A= , B= , C= ) embossed on them for
identification. 5. When diagnosis/troubleshooting is done at the
PCM connector, use the terminal test port (A) above
the terminal you need to check.
6. Connect one side of the patch cord’s terminals (A) to a commercially available digital multimeter (B),
and connect the other side cord’s terminals (C) to a
commercially available banana jack (Pomona
Electronics Tool No. 3563 or equivalent) (D).
7. Gently contact the pin probe (male) at the terminal test port from the terminal side. Do not force the
tips into the terminals.
 For accurate results, always use the pin probe (male).
 To prevent damage to the connector terminals, do not insert test equipment
probes, paper clips, or other substitutes as
they can damage the terminals. Damaged
terminals cause a poor connection and an
incorrect measurement.
 Do not puncture the insulation on a wire. Punctures can cause poor or intermittent
electrical connections.
(cont’d)
08/08/21 14:37:07 61SNR030_140_0007
ProCarManuals.com
DYNOMITE -2009-

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Electronic Control System
Functional Diagram
14-39
*1: ’06-07 models
*2: ’08-09 models Engine RPM Signal
Accelerator Pedal
Position Sensor Signal
Barometric Pressure
Sensor Signal
Manifold Absolute
Pressure Sensor Signal
ATF Temperature
Sensor Signal
Service Check SignalTransmission
Range
Switch
Signal
Brake Pedal Position
Switch Signal PGM-FI Control
System
PCM
A/T Control System Shift Control
 Ascending Control
 Descending
Control
 D-paddle Shift
Control

Clutch Pressure
Control
Lock-up Control
Shift Lock Control Shift Lock Solenoid
Vehicle Speed Signal
Data Link Connector Shift Solenoid Valve E
Shift Solenoid Valve D Shift Solenoid Valve C Shift Solenoid Valve B
Shift Solenoid Valve A
F-CAN Line
Automatic
Five-speed and
ReverseLock-up
ON/OFF
Lock-up
Conditions
Sequential
Sportshift
Control Gauge Control Module
(Tach) A/T Gear
Position Indicator
Engine Coolant
Temperature Sensor Signal
2ndClutchTransmission
Fluid Pressure Switch Signal ABS Modulator-Control
Unit Signal (via F-CAN line)*
Output Shaft (Countershaft)
Speed Sensor Signal
Paddle Shifter /
(Upshift/Downshift Switch) 3rdClutchTransmission
Fluid Pressure Switch Signal
1
VSA Modulator-Control
Unit Signal (via F-CAN line)*2
Input Shaft (Mainshaft)
Speed Sensor Signal
Grade Logic Control
Self-diagnosis/
Fail-safe Function
Communication and
Output Function
A/TClutchPressure
Control Solenoid Valve C A/TClutchPressure
Control Solenoid Valve B A/TClutchPressure
Control Solenoid Valve A
The electronic control system consists of the powertrain control module (PCM), sensors, and solenoid valves.
Shifting and lock-up are electronically controlled for comfortable driving under all conditions.
The PCM receives input signals from sensors, switches, and other control units, processes data, and outputs signals
for the engine control system and the A/T control system. The A/T control system includes shift control, grade logic
control, clutch pressure control, and lock-up control.
The PCM switches the shift solenoid valves and the A/T clutch pressure control solenoid valves ON and OFF to control
gear selection and torque converter clutch lock-up.
(cont’d)
08/08/21 14:38:21 61SNR030_140_0041
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