2006 ACURA CSX immobilizer

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)
08/08/21 14:12:33 61SNR030_110_0005
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OBD Status
11-8Fuel and Emissions Systems
General Troubleshooting Information (cont’d)
13. Do the battery installation procedure (see page
22-69).
14. Turn the ignition switch to ON (II). NOTE: DTC P0630 VIN Not Programmed or
Mismatch may be stored because the VIN has not
been programmed into the ECM/PCM; ignore it,
and continue this procedure.
15. Manually input the VIN to the ECM/PCM with the HDS.
16. Select the IMMOBI SYSTEM with the HDS.
17. Enter the immobilizer code that you got from the iN, or use the ECM/PCM replacement procedure in the
HDS; this allows you to start the engine.
18. Reset the ECM/PCM with the HDS.
19. If the TP POSITION CHECK failed in step 5, clean the throttle body (see page 11- 344).
20. Update the ECM/PCM if it does not have the latest software (see page 11-227).
21. Do the ECM/PCM idle learn procedure (see page 11-310).
22. Do the CKP pattern clear/CKP pattern learn procedure. The OBD status shows the current system status of
each DTC and all of the parameters. This function is
used to see if the repair was successfully completed.
The results of diagnostic tests for the DTC are displayed
as:
 PASSED: The on board diagnosis is successfully finished.
 FAILED: The on board diagnosis has finished but failed.
 EXECUTING: The vehicle is in enable criteria conditions for the DTC and the on board diagnosis is
running.
 NOT COMPLETED: The on board diagnosis was running but is out of the enable conditions of the DTC.
 OUT OF CONDITION: The vehicle has stayed out of the enable conditions for the DTC.
08/08/21 14:12:35 61SNR030_110_0008
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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)
08/08/21 14:12:36 61SNR030_110_0013
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µµ
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ECM/PCM Inputs and Outputs at Connector A ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-25
NOTE: Standard battery voltage is about 12 V.
4 PUR FANL (RADIATOR FAN CONTROL) Drives radiator fan relay With radiator fan running: about 0 V
With radiator fan stopped: battery voltage
5 GRY FANH (RADIATOR FAN CONTROL) Drives A/C condenser fan
relayWith A/C condenser fan running: about 0 V
With A/C condenser fan stopped: battery voltage
6 GRN MRLY (PGM-FI MAIN RELAY 1) Drives PGM-FI main relay 1
Power source for DTC
memoryWith ignition switch ON (II): about 0 V
With ignition switch OFF: battery voltage
8 ORN IGP (POWER SOURCE) Power source for ECM/PCM circuitWith ignition switch ON (II): battery voltage
9 BLK SG6 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
10 LT GRN VSV (EVAPORATIVE EMISSION (EVAP)
CANISTER VENT SHUT
VALVE) Drives EVAP canister vent
shut valve
With ignition switch ON (II): battery voltage
14 RED ACC (A/C COMPRESSOR CLUTCH RELAY) Drives A/C compressor
clutch relayWith compressor ON: about 0 V
With compressor OFF: battery voltage
15 BRN IMOFPR (IMMOBILIZER FUEL PUMP RELAY) Drives PGM-FI main relay 2
(FUEL PUMP)About 0 V for 2 seconds after turning ignition switch
ON (II), then battery voltage
16 LT GRN ACPD (A/C PRESSURE SENSOR) Detects A/C pressure
sensor signalWith A/C switch ON: about 1.7 4.8 V
(depending on A/C pressure)
17 YEL APSA (ACCELERATOR PEDAL POSITION (APP)
SENSOR A) Detects APP sensor A signal With ignition switch ON (II) and accelerator pedal
pressed: about 4.7 V
With ignition switch ON (II) and accelerator pedal
released: about 0.5 V
18 PUR APSB (ACCELERATOR PEDAL POSITION (APP)
SENSOR B) Detects APP sensor B signal With ignition switch ON (II) and accelerator pedal
pressed: about 2.3 V
With ignition switch ON (II) and accelerator pedal
released: about 0.25 V
19 RED VCC6 (SENSOR VOLTAGE) Provides sensor reference voltageWith ignition switch ON (II): about 5.0 V
20 YEL ETCSRLY (ELECTRONIC THROTTLE CONTROL
SYSTEM (ETCS) CONTROL
RELAY) Drives electronic throttle
control system (ETCS)
control relay
With ignition switch ON (II): about 0 V
(4.0 V momentarily)
21 PNK SUBRLY (PGM-FI SUBRELAY) Drives PGM-FI subrelay With ignition switch ON (II): about 0 V
23 ORN ELD (ELECTRICAL LOAD DETECTOR (ELD)) Detects ELD signal With ignition switch ON (II): about 0.1 4.8 V
(depending on electrical load)
(cont’d)
Terminal side of female terminals
08/08/21 14:12:42 61SNR030_110_0025
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Ø
ECM/PCM Inputs and Outputs at Connector A ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-27
NOTE: Standard battery voltage is about 12 V.
39 BRN BKSWNC (BRAKE PEDAL POSITION SWITCH) Detects brake pedal
position switch signalWith ignition switch ON (II) and brake pedal
released: battery voltage
With ignition switch ON (II) and brake pedal
pressed: about 0 V
40 LT GRN BKSW (BRAKE PEDAL POSITION SWITCH) Detects brake pedal
position switch signalWith brake pedal released: about 0 V
With brake pedal pressed: battery voltage
41 LT BLU CRMTCLS (CRUISE CLUTCH PEDAL POSITION
SIGNAL) Detects clutch pedal
position switch signal
With ignition switch ON (II) and clutch pedal
released: about 0 V
With ignition switch ON (II) and clutch pedal
pressed: battery voltage
42 RED WEN (WRITE ENABLE SIGNAL) Detects write enable signal With ignition switch ON (II): about 0 V
44 PNK S-NET5V (SERIAL COMMUNICATION FOR
IMMOBILIZER) Sends serial
communication signal
With ignition switch ON (II): pulses
With ignition switch OFF: about 5.0 V
2: M/T
(cont’d)
2
Terminal side of female terminals
08/08/21 14:12:43 61SNR030_110_0027
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NO
11-205
DATA LINK CONNECTOR (DLC)
K-LINE (LT BLU)
13. Turn the ignition switch to LOCK (0).
14. Turn the ignition switch to ON (II), and watch theimmobilizer indicator.
Go to the immobilizer system’s
troubleshooting (see page 22- 315).
 With TPMS: Go to step 15.
 Without TPMS: Go to step 17.
15. Turn the ignition switch to LOCK (0).
16. Turn the ignition switch to ON (II), and watch the TPMS indicator.
Go to the TPMS’s general troubleshooting
information (see page 18-49).
Go to step 17.
17. Do the gauge self-diagnostic function (see page 22-241).
18. Check for B-CAN system DTCs without the HDS (see page 22-74).
Go to the indicated DTC’s troubleshooting.
Go to step 19.
19. Turn the ignition switch to LOCK (0).
20. Disconnect the HDS from the DLC. 21. Check for continuity between DLC terminal No. 7
and body ground.
Go to step 22.
Go to step 23.
22. Continue to check for continuity between DLC terminal No. 7 and body ground, while
disconnecting these parts, one at a time:
 SRS unit connector A (28P)
 ABS modulator-control unit 25P connector (with ABS)
 VSA modulator-control unit 37P connector (with VSA system)
 EPS control unit connector D (28P)
 Immobilizer-keyless control unit 7P c onnector
 TPMS control unit 20P connector (with TPMS)
 Audio unit 17P connector
 Under-dash fuse/relay box Q (16P) connector
Replace the part that caused an open when it
was disconnected.
Repair short in the wire between the DLC (K-
line) and the ABS modulator-control unit (with
ABS), the VSA modulator-control unit (with VSA
system), the SRS unit, the EPS control unit, the
immobilizer-keyless control unit, the audio unit, the
TPMS control unit (with TPMS), or the under-dash
fuse/relay box.
(cont’d)
Terminal side of female terminals
Does the immobilizer indicator stay on or f lash?
Does t he T PM S i nd i cat or st ay on?Ar e any B-CAN DT Cs i nd i cat ed ? Is there continuity?
Does cont i nui t y go aw ay w hen one of t he abov econnect or s i s d i sconnect ed ?
08/08/21 14:21:54 61SNR030_110_0205
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YES
NO YES
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NO
11-206
PGM-FI System
DLC Circuit Troubleshooting (cont’d)
DATA LINK CONNECTOR (DLC)
K-LINE (LT BLU)
JUMPER WIRE
DATA LINK CONNECTOR (DLC)B(WHT)
23. Connect DLC terminal No. 7 to body ground with ajumper wire.
24. Check for continuity between body ground and these connector terminals:
SRS unit A (28P) No. 24 (LT BLU)
ABS modulator-control unit
25P (with ABS) No. 10
(LT BLU)
VSA modulator-control unit
37P (with VSA system) No. 26
(LTBLU)
EPS control unit D (28P) No. 17 (LT BLU)
Immobilizer-keyless control
unit 7P No. 5 (LT BLU)
TPMS control unit 20P No. 7 (LT BLU)
Audio unit 17P No. 6 (LT BLU)
Under-dash fuse/relay box Q
(16P) No. 8 (LT BLU)
Replace the part which cannot communicate
with the HDS.
Repair open in the wire between the DLC (K-
line) and the appropriate connector. 25. Do the gauge self-diagnostic function (see page
22-241).
26. Check for B-CAN system DTCs without the HDS (see page 22-74).
Go to step 39.
Go to step 27.
27. Turn the ignition switch to LOCK (0).
28. Disconnect the HDS from the DLC.
29. Measure the voltage between DLC terminal No. 16 and body ground.
Go to step 30.
Repair open in the wire between DLC terminal
No.16andtheNo.23BACKUP(10A)fuseinthe
under-hood fuse/relay box.
Terminal side of female terminals
Terminal side of female terminals
Is t her e cont i nui t y bet w een t he bod y gr ound andeach of t he t er mi nal s i n t he char t ? I s DT C B1168, B1169, and / or B117 8 i nd i cat ed ?
Is there battery voltage?
08/08/21 14:21:55 61SNR030_110_0206
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11-211
A
PGM-FI MAIN RELAY 2 (FUEL PUMP) 4P CONNECTOR IG1 ECM/PCM CONNECTOR C (44P)
IG1 (BLK/GRN)
51. Remove PGM-FI main relay 2 (FUEL PUMP) (A)from the under-dash fuse/relay box.
52. Test PGM-FI main relay 2 (FUEL PUMP) (see page 22-70).
Go to step 53.
Replace PGM-FI main relay 2 (FUEL PUMP).
Also replace the No. 2 FUEL PUMP (15 A) fuse.
53. Check for continuity between PGM-FI main relay 2 (FUEL PUMP) 4P connector terminal No. 1 and
body ground.
Go to step 54.
Go to step 57. 54. Jump the SCS line with the HDS.
55. Disconnect ECM/PCM connector C (44P).
56. Check for continuity between ECM/PCM connector
terminal C36 and body ground.
Repair short in the wire between the No. 2
FUEL PUMP (15 A) fuse and the ECM/PCM (C36),
between the No. 2 FUEL PUMP (15 A) fuse and
PGM-FI main relay 2 (FUEL PUMP), or between the
No. 2 FUEL PUMP (15 A) fuse and the immobilizer
control unit. Also replace the No. 2 FUEL PUMP
(15 A) fuse.
Replace the No. 2 FUEL PUMP (15 A) fuse,
and 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/indication goes away with
a known-good ECM/PCM, replace the original ECM/
PCM (see page 11-228).
57. Remove the rear seat cushion (see page 20-131).
58. Remove the rear floor upper cross-member and the access panel from the floor (see page 11-334).
59. Disconnect the fuel pump 4P connector.
(cont’d)
Terminal side of female terminals Terminal side of female terminals
Is the relay OK ?
Is there continuity? Is there continuity?
08/08/21 14:23:31 61SNR030_110_0211
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