Battery ACURA CSX 2006 Service Owner's Guide

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10-26Fan Controls
Radiator Fan High Speed Circuit Troubleshooting
RADIATOR FAN RELAY 4P SOCKET
FAN CONTROL RELAY 5P SOCKET
JUMPER WIRE
RADIATOR FAN RELAY 4P SOCKET JUMPER WIRE
1. Check the No. 7 (20 A) fuse in the under-hood fuse/relay box and the No. 36 (10 A) fuse in the under-
dash fuse/relay box.
Reinstall the fuse(s), then go to step 2.
Replace the fuse(s), and recheck. If the fuse
continues to blow, locate and repair the short in the
circuit between the under-hood fuse/relay box and
the radiator fan motor, or between the under-dash
fuse/relay box connector terminal G12, the under-
hood fuse/relay box and the engine control module
(ECM)/powertrain control module (PCM).
2. Remove the radiator fan relay and the fan control relay from the under-hood fuse/relay box, and test
them (see page 22-70).
Go to step 3.
Replace the radiator fan relay and/or fan
control relay.
3. Measure the voltage between the radiator fan relay 4P socket terminal No. 1 and body ground.
Go to step 4.
Replace the under-hood fuse/relay box. 4. Connect fan control relay 5P socket terminals No. 1
andNo.2withajumperwire.
5. Connect radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.
Go to step 10.
Go to step 6.
Terminal side of female terminals Terminal side of female terminals
Terminal side of female terminals
Ar e t he f uses OK ? Ar e t he r el ay s OK ?
Is there battery voltage? Does t he r ad i at or f an r un at hi gh speed ?
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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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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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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.
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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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Electronic Control Systems
Self-diagnosisOne Drive Cycle Detection Method
Two Drive Cycle Detection Method
Fail-safe Function
MIL Bulb Check and Readiness Code Condition
Self Shut Down (SSD) Mode
11-15
System Description
The functions of the fuel and emission control systems are managed by the engine control module (ECM) on vehicles
with manual transmissions or the powertrain control module (PCM) on vehicles with automatic transmissions.
The ECM/PCM detects a failure of a signal from a sensor or another control unit and stores a Temporary DTC or a DTC.
Depending on the failure, a DTC is stored in either the first or the second drive cycle (K20Z3 engine: DTC P0457, turns
on the malfunction indicator lamp (MIL) during the third drive cycle). When a DTC is stored, the ECM/PCM turns on the
malfunction indicator lamp (MIL) by a signal sent to the gauge via F-CAN.  When an abnormality occurs in the signal from a sensor or from another control unit, the ECM/PCM stores a DTC
and turns on the MIL immediately.
 When an abnormality occurs in the signal from a sensor or from another control unit in the first drive cycle, the
ECM/PCM stores a Temporary DTC. If the failure continues in the second drive cycle, the ECM/PCM stores a DTC and
turns on the MIL.
When an abnormality occurs in the signal from a sensor or another control unit, the ECM/PCM ignores the signal and
substitutes a pre-programmed value that allows the engine to continue running. This causes a DTC to be stored and
the MIL to come on.
When the ignition switch is turned to ON (II), the ECM/PCM turns on the MIL via the F-CAN circuit for about 15 to
20 seconds to check the bulb condition. If any readiness codes are not set to complete, the MIL flashes five times. If all
readiness codes are set to complete, the MIL goes off.
After the ignition switch is turned to LOCK (0), the ECM/PCM stays on (about 30 minutes). If the ECM/PCM connector is
disconnected during this time, the ECM/PCM may be damaged. To cancel this mode, disconnect the negative cable
from the battery or jump the SCS line with the HDS after the ignition switch is turned to LOCK (0).
(cont’d)
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ECM/PCM Electrical Connections
11-16Fuel and Emissions Systems
System Description (cont’d)
IGNITION
SWITCH
IG1
ST B
IG2
IG1 HOT in ON (II)
and START (III) IGNITION COIL
RELAY
ELD PGM-FI MAIN
RELAY 2 (FUEL PUMP)P
FUEL PUMP
PGM-FI MAIN
RELAY 1
BATTERY A/C CONDENSER
FAN RELAYRADIATOR
FAN RELAY
A/C COMPRESSOR
CLUTCH RELAY
To
COOLING
FAN CONTROL
RELAY E
A8 IGPC36 IG1
A14 ACC
A5 FANH A23 ELD
A4 FANL GF
C
B
D
A
PG1 B36PG2 B1
MRLY A6
IMOFPR A15
SUBRLY A21
ETCSRLY A20 STARTER CUT
RELAY (ST CUT)
PGMETCS C2 PGM-FI
SUBRELAY
ETCS CONTROL
RELAY
I
IG1ETCS C1
ECM/PCM
CLUTCH
INTERLOCK
SWITCH
H
J*2
*1
T
*3
*1: A/T
*2: M/T
*3: K20Z3 engine
UNDER-HOOD
FUSE/RELAY BOX:
No. 1 MAIN FUSE (100 A)
No.19FIMAIN(15A)
No. 2 IG MAIN (50 A)
No. 23 BACK UP (10 A)
No. 12 STOP & HORN
(15 A) No. 18 IG COIL (15 A)
UNDER-DASH
FUSE/RELAY BOX: No. 3 ALTERNATOR
(10 A) No. 2 FUEL PUMP (15 A)
No. 36 IG2 HAC (A/C)
(10 A)
UNDER-HOOD
FUSE/RELAY BOX: No.15OILLVL(7.5A)
No. 11 FI SUB (15 A)
No. 21 DBW (THROTTLE
ACTUATOR CONTROL) (15 A)
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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
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