2006 ACURA CSX battery

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EPS Control Unit Inputs and Outputs for Connector D (28P) (Connector disconnected)
Terminalnumber Wire color Terminal sign Description Signal
17-27
NOTE: Standard battery voltage is 12 V.
1WHTCAN-H (CAN-HI) CAN communication circuit
3BLUNEP (Engine pulse) Detects tachometer signal With engine running: pulses
7 BRN SCS (Service check signal) Detects service check
connector signal With service check signal not grounded: battery voltage
8 LT GRN VS2 (Voltage sensor 2) Detects torque sensor
signal
9 BRN PVF (Voltage fade) Drives the torque sensor
10 GRN VS1 (Voltage sensor 1) Detects torque sensor
signal
12 PNK S1 (Signal 1) Detects motor angle sensor
signal
13 BLU R1 (EPS Motor angle
sensor 1) Detects motor angle sensor
signal
14 BRN S2 (Signal 2) Detects motor angle sensor
signal
15 RED CAN-L (CAN-LO) CAN communication circuit
16 YEL GRYIG1
(Ignition 1) Power source for activating
the system With ignition switch ON (II): battery voltage
17 LT BLU K-LINE (Data link connector) Communicates with HDS With service check signal opened: about 5.0 V
26 BRN S3 (Signal 3) Detects motor angle sensor
signal
27 PNK R2 (EPS Motor angle
sensor 2) Detects motor angle sensor
signal
28 BLU S4 (Signal 4) Detects motor angle sensor
signal
1: ’06 model
2: ’07-09 models
(cont’d)
12
Wire side of female terminals
08/08/21 14:54:00 61SNR030_170_0028
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DYNOMITE -2009-

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17-30EPS Components
Circuit Diagram
BATTERY
GAUGE CONTROL
MODULE (TACH) IGNITION
SWITCH
WHT
UNDER-HOOD
FUSE/RELAY BOX
BRN
BLU UNDER-DASH
FUSE/RELAY BOX
DATA LINK
CONNECTOR (DLC) EPS
INDICATOR
BRN
WHT
RED
BLU
WHT
RED
WHT
RED
ORNLT BLU WHT
ECM/PCM
BRN
3
6 F16
Q9
IG1 HOT in ON (II)
and START (III) D2
B1
H1 YEL*
GRY*
No. 10 (7.5 A)
No. 2 (50 A)
No. 4 (7.5 A)
CAN-H 17
1
19
CAN-L IG1
CAN-H A28
A36
A37
CAN-L NEP
CAN-L 6
14
9
SCS
CAN-H
7
K-LINE
No. 1 (70 A)
No. 1 (100 A)
IG11 2
08/08/21 14:54:01 61SNR030_170_0031
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DTC 11-01:
DTC 11-02:
YES
NO YES
NO
17-33
DTC Troubleshooting
EPS CONTROL UNIT CONNECTOR D (28P)
IG1 (YEL)* (GRY)*
*1: ’06 model
*2: ’07-09 models
12
Low/High IG1-terminal Voltage
(Initial Diagnosis)
Low/High IG1-terminal Voltage
(Regular Diagnosis)
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine.
5. Wait at least 60 seconds.
Go to step 6.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
6. Turn the ignition switch to LOCK (0).
7. Disconnect EPS control unit connector D (28P). 8. Turn the ignition switch to ON (II).
9. Wait at least 60 seconds.
10. Measure the voltage between EPS control unit connector D (28P) terminal No. 16 and body ground.
Check for loose terminals in the EPS control
unit connectors, and repair if necessary. If no poor
connections are found, replace the EPS control unit
(see page 17-84).
If there is no voltage, or the voltage is lower
than specified, repair an open or high resistance in
thewirebetweentheNo.4(7.5A)fuseinthe
under-dash fuse/relay box and the EPS control unit.
If the wire checks OK, check the battery (see page
22-67), and troubleshoot the alternator regulator
circuit (see page 4-28).
Wire side of female terminalsDoes t he E PS i nd i cat or come on?
Is there battery voltage?
08/08/21 14:54:03 61SNR030_170_0034
ProCarManuals.com
DYNOMITE -2009-

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DTC 12-01:
YES
NO
YES
NO
YES
NO YES
NO
YES
NO
17-34
EPS Components
DTC Troubleshooting (cont’d)
B(WHT)
EPS CONTROL UNIT CONNECTOR A (2P) EPS CONTROL UNIT CONNECTOR A (2P)
B(WHT)
Low/High VBU Voltage (Regular
Diagnosis)
1. Turn the ignition switch to ON (II).
2. Check the BATTERY in the EPS DATA LIST with the
HDS.
Check for loose terminals or poor
connections. If the connections are good, the
system is OK at this time.
Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Check the No. 1 (70 A) fuse in the under-hood fuse/ relay box.
Reinstall the checked fuse, then go to step
13.
Go to step 5.
5. Disconnect the EPS control unit connector A (2P).
6. Check for continuity between EPS control unit connector A (2P) terminal No. 2 and body ground.
Repair short to body ground in the wire
between the EPS control unit and the No. 1 (70 A)
fuse in the under-hood fuse/relay box.
Install a new No. 1 (70 A) fuse in the under-
hood fuse/relay box, then go to step 7. 7. Reconnect the EPS control unit connector A (2P).
8. Turn the ignition switch to ON (II).
9. Clear the DTC with the HDS.
10. Turn the ignition switch to LOCK (0).
11. Start the engine.
12. Check for DTCs with the HDS.
Replace the EPS control unit (see page 17-84).
Troubleshooting is complete. If any other
DTCs are indicated, go to the indicated DTC’s
troubleshooting.
13. Disconnect EPS control unit connector A (2P) and connector D (28P).
14. Measure the voltage between EPS control unit connector A (2P) terminal No. 2 and body ground.
Check for loose terminals in the EPS control
unit connectors, and repair if necessary. If no poor
connections are found, replace the EPS control unit
(see page 17-84).
Repair open in the wire between the EPS
control unit and the No. 1 (70 A) fuse in the under-
hood fuse/relay box.
Wire side of female terminals Wire side of female terminals
Is the voltage at 9.2 17.4 V ?
IsthefuseOK?
Is there continuity? Is DTC 12-01 indicated?
Is there battery voltage?
08/08/21 14:54:03 61SNR030_170_0035
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DYNOMITE -2009-



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DTC 33-02:
DTC 33-07:
YES
NO
YES
NO
YES
NO
17-43
EPS CONTROL UNIT CONNECTOR B (2P)H-W (GRN)
EPS CONTROL UNIT CONNECTOR C (2P) H-U (RED) H-V (BLU)
Upper FET Stuck ON (Initial
Diagnosis)
Upper FET Stuck ON (Regular
Diagnosis)
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine.
Go to step 5.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
5. Check for DTCs with the HDS.
Go to step 6.
Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time.
6. Turn the ignition switch to LOCK (0).
7. Disconnect EPS control unit connector B (2P) and connector C (2P).
8. Turn the ignition switch to ON (II). 9. Measure the voltage between body ground and
EPS control unit connector B (2P) terminal No. 1,
connector C (2P) terminal No. 1, and connector C
(2P) terminal No. 2 individually.
Go to step 10.
Check for loose terminals in the EPS control
unit connectors and the EPS motor connectors, and
repair if necessary. If no poor connections are
found, replace the EPS control unit (see page 17-84).
10. Turn the ignition switch to LOCK (0).
(cont’d)
Wire side of female terminals
Wire side of female terminals
Does t he E PS i nd i cat or come on? Is DT C 33-02 or 33-07 ind icated ? Is there battery voltage?
08/08/21 14:54:33 61SNR030_170_0044
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DYNOMITE -2009-



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YES
NO YES
NO
YES
NO
DTC 34-01:
17-4417-44EPS Components
DTC Troubleshooting (cont’d)
EPS CONTROL UNIT CONNECTOR B (2P)
H-W (GRN)
EPS CONTROL UNIT CONNECTOR C (2P) H-U (RED) H-V (BLU)
11. Disconnect the EPS motor 1P connector and EPSmotor 2P connector.
12. Turn the ignition switch to ON (II).
13. Measure the voltage between body ground and EPS control unit connector B (2P) terminal No. 1,
connector C (2P) terminal No. 1, and connector C
(2P) terminal No. 2 individually.
Repair short to power in the wire between
the EPS control unit and the EPS motor.
Short to power in the EPS motor wire; or a
short in the EPS motor internal circuit, replace the
EPS motor (see page 17-63). 1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Turn the ignition switch to ON (II).
Go to step 5.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
5. Check for DTCs with the HDS.
Check for loose terminals in the EPS control
unit connectors, and repair if necessary. If no poor
connections are found, replace the EPS control unit
(see page 17-84).
Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time.Power Relay Stuck ON (Ignition
Switch is in LOCK (0))
Wire side of female terminals
Wire side of female terminals
Is there battery voltage? Does t he E PS i nd i cat or come on?
Is DTC 34-01 indicated?
08/08/21 14:54:33 61SNR030_170_0045
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DYNOMITE -2009-



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DTC 34-02:
YES
NO
YES
NO
YES
NO
17-45
EPS CONTROL UNIT CONNECTOR B (2P)H-W (GRN)
EPS CONTROL UNIT CONNECTOR C (2P) H-U (RED) H-V (BLU)
Fail-safe Relay Stuck ON (Initial
Diagnosis)
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Turn the ignition switch to ON (II).
Go to step 5.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
5. Check for DTCs with the HDS.
Go to step 6.
Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time.
6. Turn the ignition switch to LOCK (0).
7. Disconnect EPS control unit connector B (2P) and connector C (2P).
8. Turn the ignition switch to ON (II). 9. Measure the voltage between body ground and
EPS control unit connector B (2P) terminal No. 1,
connector C (2P) terminal No. 1, and connector C
(2P) terminal No. 2 individually.
Repair short to power in the wire between
the EPS control unit and the EPS motor.
Replace the EPS control unit (see page 17-84).
Wire side of female terminals
Wire side of female terminals
Does t he E PS i nd i cat or come on? Is DTC 34-02 indicated?
Is there battery voltage?
08/08/21 14:54:34 61SNR030_170_0046
ProCarManuals.com
DYNOMITE -2009-

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YES
NO
YES
NO YES
NO
17-61
EPS CONTROL UNIT CONNECTOR D (28P)
IG1 (YEL)* (GRY)*
*1: ’06 model
*2: ’07-09 models EPS CONTROL UNIT CONNECTOR A (2P)
PG (BLK)
12
5. Reconnect EPS control unit connector D (28P).
6. Turn the ignition switch to ON (II), and watch theEPS indicator.
Troubleshooting is complete.
Replace the EPS control unit (see page 17-84).
7. Disconnect EPS control unit connector D (28P).
8. Turn the ignition switch to ON (II).
9. Measure the voltage between EPS control unit connector D (28P) terminal No. 16 and body ground.
Go to step 10.
Repair open in the wire between the EPS
control unit and under-dash fuse/relay box.
10. Turn the ignition switch to LOCK (0).
11. Disconnect EPS control unit connector A (2P). 12. Check for continuity between EPS control unit
connector A (2P) terminal No. 1 and body ground.
Go to step 13.
Repair open in the wire between the EPS
control unit and body ground (G 402).
(cont’d)
Wire side of female terminals Wire side of female terminals
Does the EPS indicator come on, then go of f ?
Is there battery voltage? Is there continuity?
08/08/21 14:55:07 61SNR030_170_0062
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