2006 ACURA CSX dlc circuit troubleshooting


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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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)
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Symptom Diagnostic procedure Also check for
11-13
Symptom Troubleshooting Index
When the vehicle has one of these symptoms, check for a diagnostic trouble code (DTC) with the HDS. If there is no
DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.












Engine will not start
(MIL works OK, no DTCs set)
1.
2.
3.
4.Test the battery (see page 22-67).
Test the starter (see page 4-9).
Check the fuel pressure (see page 11-325).
Troubleshoot the fuel pump circuit (see page 11-
318).Low compression
No ignition spark
Intake air leaks
Locked up engine
Broken cam chain
Fuel contamination
Engine will not start
(MIL comes on and stays on,
no DTCs set) Troubleshoot the DLC circuit (see page 11-204).
MIL comes on and stays on,
or never comes on at all, no
DTCs set Troubleshoot the MIL circuit (see page 11-203).
Engine will not start
(MIL works OK, no DTCs set,
immobilizer indicator stays
on or flashes) Check the immobilizer system (see page 22-321).
Engine starts but stalls
immediately
(MIL works OK, no DTCs set,
immobilizer indicator stays
on or flashes) Check the immobilizer system (see page 22-323).
Engine is hard to start
(MIL works OK, no DTCs set) 1.
2.
3.Test the battery (see page 22-67).
Check the fuel pressure (see page 11-325).
Clean the throttle body (see page 11-
344).Low compression
Intake air leaks
Fuel contamination
Weak spark
Cold fast idle too low
(MIL works OK, no DTCs set) 1.
2.
3.DotheECM/PCMidlelearnprocedure(seepage
11-310).
Check the idle speed (see page 11-309).
Clean the throttle body (see page 11-
344).
Cold fast idle too high
(MIL works OK, no DTCs set) 1.
2.
3.DotheECM/PCMidlelearnprocedure(seepage
11-310).
Check the idle speed (see page 11-309).
Do the throttle position learning check (see page
11-343). Intake air leaks
Idle speed fluctuates
(MIL works OK, no DTCs set) 1.
2.
3.
4.DotheECM/PCMidlelearnprocedure(seepage
11-310).
Check the idle speed (see page 11-309).
Do the carbon accumulation check (see page 11-343).
Troubleshoot the A/C signal circuit (see page 11-306). Incorrect valve
timing or clearance
adjustment
Intake air leaks
After warming up, idle speed
is below specification without
load
(MIL works OK, no DTCs set) 1.
2.
Troubleshoot the alternator FR signal circuit
(see page 11-307).
Do the carbon accumulation check (see page 11-343). Incorrect valve
timing or clearance
adjustment
After warming up, idle speed
is above specification without
load
(MIL works OK, no DTCs set) 1.
2.
Troubleshoot the alternator FR signal circuit
(see page 11-307).
Inspect the APP sensor (see page 11-268). Intake air leaks
(cont’d)
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SymptomDiagnostic procedure Also check for
11-14Fuel and Emissions Systems
Symptom Troubleshooting Index (cont’d)










Low power
(MIL works OK, no DTCs set)
Check the fuel pressure (see page 11-325). Low compression
Incorrect camshaft
timing
Incorrect engine oil
level
Exhaust restriction
Engine stalls
(MIL works OK, no DTCs set) 1.
2.
3.
4.DotheECM/PCMidlelearnprocedure(seepage
11-310).
Check the fuel pressure (see page 11-325).
Check the idle speed (see page 11-309).
Troubleshoot the brake pedal position switch signal
circuit (see page 11-308). Intake air leaks
Faulty harness and
sensor
connections
Fuel contamination
Difficult to refuel
(MIL works OK, no DTCs set) 1.
2.
3.Check the fuel vent tube between the EVAP canister
and the fuel tank.
Check the fuel tank vapor recirculation tube between
thefuelpipeandthefueltank.
Replace the fuel tank (see page 11-339). Malfunctioning gas
station filling
nozzle.
Filler neck
restriction
Faulty fuel tank
vapor control valve
Fuel overflows during
refueling
(No DTCs set) Replace the fuel tank (see page 11-339). Malfunctioning gas
station filling nozzle.
HDS does not communicate
with the ECM/PCM or the
vehicle Troubleshoot the DLC circuit (see page 11-204).
Fuel cap warning message
stays on
(MIL works OK, no DTCs set)
(K20Z3 engine) Troubleshoot the fuel cap warning message system
(see page 11-405).
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11-73
AIR FUEL RATIO (A/F) SENSOR
(SENSOR 1)SECONDARY HEATED OXYGEN
SENSOR (SECONDARY HO2S)
(SENSOR 2)
DATA LINK CONNECTOR (DLC)
PGM-FI MAIN RELAY 2
(FUEL PUMP)
Replacement, page 11-221
Replacement, page 11-221
General Troubleshooting Information, page 11-3
Circuit Troubleshooting, page 11-204
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DTC U0122:
YES
NO
YES
NO
YES
NO YES
NO
11-184PGM-FI System
DTC Troubleshooting (cont’d)
CANH (WHT)
CANH (WHT) ECM/PCM CONNECTOR A (44P)
VSA MODULATOR-CONTROL
UNIT 37P CONNECTOR
F-CAN Malfunction (ECM/PCM-
VSA Modulator-Control Unit)
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. Check for Temporary DTCs or DTCs with the HDS.
Go to the troubleshooting for DTC U 0028.
Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at the VSA modulator-control unit and the ECM/
PCM.
5. Check for communication to the VSA system with the HDS.
Go to step 6.
Go to the DLC circuit troubleshooting
(see page 11-204).
6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS.
8. Disconnect the VSA modulator-control unit 37P connector (see page 19- 171).
9. Disconnect ECM/PCM connector A (44P). 10. Check for continuity between ECM/PCM connector
terminal A36 and VSA modulator-control unit 37P
connector terminal No. 15.
Go to step 11.
Repair open in the wire between the ECM/
PCM (A36) and the VSA modulator-control unit,
then go to step 12.
Terminal side of female terminals
Wire side of female terminals
Ar e DT C U 0028 and U 0122 i nd i cat ed at t he same time?
Is DTC U0122 indicated?
Does the HDS communicate with the V SAmod ul at or -cont r ol uni t ? Is there continuity?
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DTC U0131:
YES
NO
YES
NO
YES
NO YES
NO
11-186PGM-FI System
DTC Troubleshooting (cont’d)
ECM/PCM CONNECTOR A (44P)
CANH (WHT)
JUMPER WIRE
EPS CONTROL UNIT CONNECTOR D (28P) CANH (WHT)
F-CAN Malfunction (ECM/PCM-
EPS Control Unit)
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. Check for Temporary DTCs or DTCs with the HDS.
Go to the troubleshooting for DTC U 0028.
Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at the EPS control unit and the ECM/PCM.
5. Check that the HDS communicates with the EPS system.
Go to step 6.
Go to the DLC circuit troubleshooting
(see page 11-204).
6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS.
8. Disconnect EPS control unit connector D (28P) (see page 17-84).
9. Disconnect ECM/PCM connector A (44P) 10. Connect ECM/PCM connector terminal A36 to body
ground with a jumper wire.
11. Check for continuity between EPS control unit connector D (28P) terminal No. 1 and body ground.
Go to step 12.
Repair open in the wire between the ECM/
PCM (A36) and the EPS control unit, then go to step
14.
Terminal side of female terminals
Wire side of female terminals
Ar e DT C U 0028 and U 0131 i nd i cat ed at t he sametime?
Is DT C U0131 ind icated ?
Does the HDS communicate with the EPS controluni t ? I s t her e cont i nui t y ?
08/08/21 14:21:47 61SNR030_110_0186
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YES
NO YES
NO
11-200PGM-FI System
F-CAN Circuit Troubleshooting (cont’d)
ECM/PCM CONNECTOR A (44P)
CANH (WHT) ECM/PCM CONNECTOR A (44P)
CANL (RED)
46. Check for continuity between ECM/PCM connectorterminal A36 and body ground.
Repair short in the wire between the ECM/
PCM connector terminal A36 and the gauge control
module (tach), the ABS modulator-control unit, the
VSA modulator-control unit, the yaw rate-lateral
acceleration sensor, the SRS unit, the EPS control
unit, the TPMS control unit (with TPMS), or the
DLC.
Go to step 47. 47. Check for continuity between ECM/PCM connector
terminal A37 and body ground.
Repair short in the wire between ECM/PCM
connector terminal A37 and the gauge control
module (tach), the ABS modulator-control unit, the
VSA modulator-control unit, the yaw rate-lateral
acceleration sensor, the SRS unit, the EPS control
unit, the TPMS control unit (with TPMS), or the
DLC.
Go to step 48.
Terminal side of female terminals Terminal side of female terminals
I s t her e cont i nui t y ?I s t her e cont i nui t y ?
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