ACURA CSX 2006 Service Repair Manual

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10-28Fan Controls
Radiator Fan High Speed Circuit Troubleshooting (cont’d)
FAN CONTROL RELAY 5P SOCKET
RADIATOR FAN MOTOR 2P CONNECTOR RED RADIATOR FAN RELAY 4P SOCKET
9. Check for continuity between fan control relay 5P
socket terminal No. 1 and radiator fan motor 2P
connector terminal No. 1.
Check for poor connections or loose
terminals at the under-hood fuse/relay box, the
radiator fan motor, and body ground (G 301), then
go to step 1.
Repair open in the wire between fan control
relay 5P socket terminal No. 1 and radiator fan
motor 2P connector terminal No. 1. 10. Turn the ignition switch to ON (II).
11. Measure the voltage between radiator fan relay 4P
socket terminal No. 3 and body ground.
Go to step 12.
Repair open in the wire between the under-
dash fuse/relay box and the under-hood fuse/relay
box.
12. Turn the ignition switch to LOCK (0).
13. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on page 11-3).
14. Turn the ignition switch to ON (II).
15. Make sure the HDS communicates with the vehicle and the ECM/PCM. If it does not communicate,
troubleshoot the DLC circuit (see page 11-204).
16. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
NOTE: This step must be done to protect the ECM/
PCMfromdamage.
17. Disconnect ECM/PCM connector A (44P).
Terminal side of female termianls
Wire side of female terminals Terminal side of female terminals
Is there continuity?
Is there battery voltage?
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10-29
RADIATOR FAN RELAY 4P SOCKET
ECM/PCM CONNECTOR A (44P) PUR FAN CONTROL RELAY 5P SOCKET
18. Check for continuity between radiator fan relay 4P
socket terminal No. 4 and ECM/PCM connector
terminal A4.
Go to step 19.
Repair open in the wire between radiator fan
relay 4P socket terminal No. 4 and ECM/PCM
connector terminal A4. 19. Turn the ignition switch to ON (II).
20. Measure the voltage between fan motor control
relay 5P socket terminal No. 5 and body ground.
Go to step 21.
Repair open in the wire between the under-
dash fuse/relay box and the under-hood fuse/relay
box.
21. Turn the ignition switch to LOCK (0).
(cont’d)
Terminal side of female terminals
Terminal side of female terminals
Terminal side of female terminals
Is there continuity?Is there battery voltage?
08/08/21 14:40:34 61SNR030_100_0029
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YES
NO
10-30 Fan Controls
Radiator Fan High Speed Circuit Troubleshooting (cont’d)
FAN CONTROL RELAY 5P SOCKET
FANH (GRY)
ECM/PCM CONNECTOR A (44P)
22. Check for continuity between fan control relay 5P socket terminal No. 3 and ECM/PCM connector
terminal A5.
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), then
recheck. If the symptom goes away with a known-
good ECM/PCM, replace the original ECM/PCM
(see page 11-228).
Repair open in the wire between fan control
relay 5P socket terminal No. 3 and ECM/PCM
connector terminal A5.
Terminal side of female terminals
Terminal side of female terminals
Is there continuity?
08/08/21 14:40:34 61SNR030_100_0030
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Fuel and Emissions
Fuel and Emissions Systems
PGM-FI System
Electronic Throttle Control System
VTEC/VTC
Idle Control SystemFuel Supply System
Intake Air System
Catalytic Converter System
EGR System
PCV System
EVAP System..................................................
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Special Tools . 11-2
General Troubleshooting Information . 11-3
DTC Troubleshooting Index . 11-9
Symptom Troubleshooting Index . 11-13
System Description . 11-15
How to Set Readiness Codes . 11-69
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Component Location Index . 11-72
DTC Troubleshooting . 11-74
F-CAN Circuit Troubleshooting . 11-191
MIL Circuit Troubleshooting . 11-203
DLC Circuit Troubleshooting . 11-204
Injector Replacement . 11-219
A/F Sensor Replacement . 11-221
Secondary HO2S Replacement . 11-221
CMP Sensor B Replacement . 11-222
CKP Sensor Replacement . 11-222
Output Shaft (Countershaft) Speed Sensor
Replacement . 11-223
Knock Sensor Replacement . 11-223
MAP Sensor Replacement . 11-224
MAF Sensor/IAT Sensor Replacement . 11-224
ECT Sensor 1 Replacement . 11-225
ECT Sensor 2 Replacement . 11-225
ELD Replacement . 11-226
ECM/PCM Update . 11-227
ECM/PCM Replacement . 11-228
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Component Location Index . 11-231
DTC Troubleshooting . 11-232
APP Sensor Signal Inspection . 11-268
Accelerator Pedal Module
Removal/Installation . 11-269
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Component Location Index
. 11-273
DTC Troubleshooting . 11-274
VTC Oil Control Solenoid Valve Removal/Test/Installation . 11-294
CMP Sensor A Replacement . 11-295
Rocker Arm Oil Control Valve Removal/Installation . 11-296
Rocker Arm Oil Pressure Switch Removal/Installation . 11-296
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Component Location Index
. 11-297
DTC Troubleshooting . 11-298
A/C Signal Circuit Troubleshooting . 11-306
Alternator FR Signal Circuit Troubleshooting . 11-307
Brake Pedal Position Switch Signal Circuit Troubleshooting . 11-308
Idle Speed Inspection . 11-309
ECM/PCM Idle Learn Procedure . 11-310 ..........................
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Component Location Index
. 11-311
DTC Troubleshooting . 11-313
Fuel Pump Circuit Troubleshooting . 11-318
Fuel Pressure Relieving . 11-322
Fuel Pressure Test . 11-325
Fuel Tank Draining . 11-325
Fuel Line Inspection . 11-326
Fuel Line/Quick-Connect Fitting Precautions . 11-328
Fuel Line/Quick-Connect Fitting Removal . 11-329
Fuel Line/Quick-Connect Fitting Installation . 11-331
Fuel Tank Unit Removal and Installation . 11-334
Fuel Pressure Regulator Replacement . 11-337
Fuel Filter Replacement . 11-337
Fuel Pump/Fuel Gauge Sending Unit Replacement . 11-338
Fuel Tank Replacement . 11-339
Fuel Gauge Sending Unit Test . 11-340
Low Fuel Indicator Test . 11-341
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Component Location Index
. 11-342
Throttle Body Test . 11-343
Throttle Body Cleaning . 11-344
Intake Air Bypass Control Thermal Valve Test . 11-344
Air Cleaner Removal/Installation . 11-345
Air Cleaner Element Inspection/Replacement . 11-346
Intake Air Resonator Removal/Installation . 11-346
Throttle Body Removal/Installation . 11-348
Throttle Body Disassembly/Reassembly . 11-350
Intake Air Bypass Control Thermal Valve Replacement . 11-351
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Component Location Index
. 11-352
DTC Troubleshooting . 11-353
Catalytic Converter Removal/Installation . 11-355
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Component Location Index
. 11-356
DTC Troubleshooting . 11-357
EGR Valve Replacement . 11-370
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Component Location Index
. 11-371
PCV Valve Inspection . 11-372
PCV Valve Replacement . 11-373
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Component Location Index
. 11-374
DTC Troubleshooting . 11-375
Fuel Cap Warning Message System Troubleshooting . 11-405
EVAP Canister Replacement . 11-407
FTP Sensor Replacement . 11-408
EVAP Canister Vent Shut Valve Replacement . 11-409
EVAP Canister Purge Valve Replacement . 11-409
08/08/21 14:12:30 61SNR030_110_0001
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%)Ref. No. Tool Number Description Qty
11-2
Fuel and Emissions Systems
Special Tools
07AAA-SNAA100
Fuel Pump Module Locknut Wrench 1
07AAJ-S6MA150 Fuel Pressure Gauge Attachment Set 1
07JAZ-001000B Vacuum/Pressure Gauge, 0 4 in.Hg 1
07NAJ-P07010A Pressure Gauge Adapter 1
07ZAJ-S5AA200 Oil Pressure Hose 1
-1 07406-0020201 A/T Pressure Hose 1
-2 07406-0070301 A/T Low Pressure Gauge W/Panel 1
-3 07MAJ-PY4011A A/T Pressure Hose, 2,210 mm 1
-4 07MAJ-PY40120 A/T Pressure Adapter 1
07406-004000B Fuel Pressure Gauge 1
-1, -2, -3, -4
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Intermittent Failures
Service Information
Opens and Shorts
How to Use the HDS (Honda Diagnostic
System)
If the MIL (malfunction indicator lamp) has come on If the MIL did not stay on
If you can’t duplicate the DTC
11-3
General Troubleshooting Information
A
A
The term intermittent failure means a system may have
had a failure, but it checks OK now. If the malfunction
indicator lamp (MIL) on the dash does not come on,
check for poor connections or loose terminals at all
connectors related to the circuit that you are
troubleshooting. If the MIL was on but then went out,
the original problem may have been intermittent.
Periodically, new ECM/PCM software or new service
procedures may become available. Always check
online for the latest software or service information
relatedtotheDTCsorsymptomsyouare
troubleshooting.
Open and short are common electrical terms. An open
is a break in a wire or at a connection. A short is an
accidental connection of a wire to ground or to another
wire. In simple electronics, this usually means
something won’t work at all. With complex electronics
(such as ECMs or PCMs) this can sometimes mean
something works, but not the way it’s supposed to.1. Start the engine, and check the MIL (A). NOTE: If the ignition switch is turned to ON (II), and
the engine is not started, the MIL stays on for
15 20 seconds (see page 11-69). 2. If the MIL stays on, connect the HDS to the data link
connector (DLC) (A) located under the driver’s side
of the dashboard.
3. Turn the ignition switch to ON (II).
4. Make sure the HDS communicates with the ECM/ PCM and other vehicle systems. If it doesn’t, go to
the DLC circuit troubleshooting (see page 11-204).
5. Check the diagnostic trouble code (DTC) and note it. Also check the freeze data and/or on-board
snapshot data, and download any data found. Then
refer to the indicated DTC’s troubleshooting, and
begin the appropriate troubleshooting procedure.
NOTE: Freeze data indicates the engine conditions when the first malfunction, misfire, or fuel trim
malfunction that activated the MIL was detected.
 The HDS can read the DTC, freeze data, on-board snapshot, current data, and other engine control
module (ECM) or powertrain control module
(PCM) data.
 For specific operations, refer to the user’s manual that came with the HDS.
6. If no DTCs are found, go to MIL troubleshooting (see page 11-203).
If the MIL did not stay on but there is a driveability
problem, do the symptom troubleshooting.
Some of the troubleshooting requires you to reset the
ECM/PCM and try to duplicate the DTC. If the problem is
intermittent and you can’t duplicate the code, do not
continue through the procedure. To do so will only
result in confusion and possibly, a needlessly replaced
ECM/PCM. (cont’d)
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HDS Clear Command
Scan Tool Clear Command
DTC ClearECM/PCM Reset
CKP Pattern Clear/CKP Pattern Learn
Clear/Learn Procedure (with the HDS)
11-4Fuel and Emissions Systems
General Troubleshooting Information (cont’d)
A
The ECM/PCM stores various specific data to correct the
system even if there is no electrical power, such as
when the battery negative terminal or the No. 19
FI MAIN (15 A) fuse is disconnected. Stored data based
on failed parts should be cleared by using the CLEAR
COMMAND of the HDS, if parts are replaced.
The HDS has three kinds of clear commands to meet
this purpose. They are DTC clear, ECM/PCM reset, and
CKP pattern clear. DTC clear command erases all stored
DTC codes, freeze data, on-board snapshot, and
readiness codes. This must be done with the HDS after
reproducing the DTC during troubleshooting.
The ECM/PCM reset command erases all stored DTC
codes, freeze data, on-board snapshot, readiness codes,
and all specific data to correct the system except CKP
pattern. If the CKP pattern data in the ECM/PCM was
cleared, you must do the CKP pattern learn procedure.
The CKP pattern clear command erases only CKP
pattern data. This command is for repair of a misfire or
the CKP sensor.
If you are using a generic scan tool to clear commands,
be aware that there is only one setting for clearing the
ECM/PCM, and it clears all commands at the same time
(CKP pattern learn, idle learn, readiness codes, freeze
data, on-board snapshot, and DTCs). After you clear all
commands, you then need to do these procedures, in
this order: ECM/PCM idle learn procedure (see page
11-310); CKP pattern learn procedure;
Test-drive to set readiness codes to complete (see page
11-69).
1. Clear the DTC with the HDS while the engine is stopped.
2. Turn the ignition switch to LOCK (0).
3. Turn the ignition switch to ON (II), and wait 30 seconds.
4. Turn the ignition switch to LOCK (0), and disconnect the HDS from the DLC. 1. Reset the ECM/PCM with the HDS while the engine
is stopped.
2. Turn the ignition switch to LOCK (0).
3. Turn the ignition switch to ON (II), and wait 30 seconds.
4. Turn the ignition switch to LOCK (0), and disconnect the HDS from the DLC.
5. Do the ECM/PCM idle learn procedure (see page 11-310).
1. Connect the HDS to the data link connector (DLC) (A) located under the driver’s side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the ECM/ PCM and other vehicle systems. If it doesn’t, go to
the DLC circuit troubleshooting (see page 11-204).
4. Select CRANK PATTERN in the ADJUSTMENT MENU with the HDS.
5. Select CRANK PATTERN LEAR NING with the HDS,
and follow the screen prompts.
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Learn Procedure (without the HDS)How to End a Troubleshooting Session
(required after any troubleshooting)
11-5
1. 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.
2. Test-drive the vehicle on a level road: Decelerate (with the throttle fully closed) from an engine speed
of 2,500 rpm down to 1,000 rpm with the A/T in
S in 1st or 2nd, or M/T in 1st.
3. Test-drive the vehicle on a level road: Decelerate (with the throttle fully closed) from an engine speed
of 5,000 rpm down to 3,000 rpm with the A/T in
S in 1st or 2nd, or M/T in 1st.
4. Repeat step 2 and 3 several times.
5. Turn the ignition switch to LOCK (0).
6. Turn the ignition switch to ON (II), and wait 30 seconds. 1. Reset the ECM/PCM with the HDS.
2. Do the ECM/PCM idle learn procedure (see page
11-310).
3. Turn the ignition switch to LOCK (0).
4. Disconnect the HDS from the DLC. NOTE: The ECM/PCM is part of the immobilizer
system. If you replace the ECM/PCM, it will have a
different immobilizer code. For the engine to start,
you must rewrite the immobilizer code with the
HDS.
(cont’d)
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How to Troubleshoot Circuits at the ECM/
PCM Connectors
11-6 Fuel and Emissions Systems
General Troubleshooting Information (cont’d)
A
D E
B
A
C A
B D
C
A
NOTE: The ECM/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 ECM/
PCM during this function, without jumping the SCS line
first, can damage the ECM/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 ECM/ PCM connectors A, B, and C, and probe the
terminals from the terminal side of the connectors.
NOTE: ECM/PCM connectors A, B, and C have
symbols (A= , B= , C= ) embosed on them for
identification. 5. When diagnosis/troubleshooting is done at the
ECM/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 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.
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Substituting the ECM/PCM
Special Tools Required
11-7
AA
D
9.8 N·m
(1.0 kgf·m,
7.2 lbf·ft)
A
B
C
E
 Honda diagnostic system (HDS) tablet tester
 Honda interface module (HIM) and an iN workstation with the latest HDS software version
 HDS pocket tester
 GNA600 and an iN workstation with the latest HDS software version
Any one of the above updating tools can be used.
NOTE: Use this procedure when you need to substitute
a known-good ECM/PCM during troubleshooting
procedures.
1. Connect the HDS to the data link connector (DLC) (A) located under the driver’s side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the ECM/ PCM and other vehicle systems. If it doesn’t, go to
the DLC circuit troubleshooting (see page 11-204). If
you are returning from DLC circuit troubleshooting,
skip step 4 and 5, and clean the throttle body after
substituting the ECM/PCM (see page 11-344).
4. Select the INSPECTION MENU with the HDS.
5. Select the ETCS TEST, then select the TP POSITION CHECK, and follow the screen prompts.
NOTE: If the TP POSITION CHECK indicates FAILED,
continue this procedure. 6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS.
8. Do the battery removal procedure (see page 22-69).
9. Remove the cover (A).
10. Remove the bolts (D), then remove the ECM/PCM (E).
11. Disconnect ECM/PCM connectors A, B, and C. NOTE: ECM/PCM connectors A, B, and C have
symbols (A= , B= , C= ) embossed on them for
identification.
12. Install the parts in the reverse order of removal.
(cont’d)
08/08/21 14:12:35 61SNR030_110_0007
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