tachometer ACURA CSX 2006 Service Repair Manual

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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
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µ
µ µ
µ
µ
µ
DTC 21-01:
DTC 21-02:
YES
NO YES
NO
YES
NO
17-35
Excessive Change of the Vehicle
Speed Signal (Regular Diagnosis)
Comparison between the Vehicle
Speed and the Engine Speed Signal (Regular
Diagnosis)
NOTE:
 If the MIL is on, troubleshoot the fuel and emissions systems first.
 Even though the system is operating normally, the EPS indicator will come on caused by the detecting
condition of DTC 21-01 or DTC 21-02 when you raise
the engine speed with the vehicle stopped.
 Clear the DTC related to the ABS/VSA.
1. Turn the ignition switch to LOCK (0).
2. Raise the vehicle, and support it with safety stands in the proper locations (see page 1-11), and allow
all wheels to rotate freely.
3. Connect the HDS to the data link connector (DLC).
4. Turn off VSA by using the VSA OFF switch.
5. Start the engine, run the vehicle in the 4th (M/T), or D position (A/T).
6. Check the VEHICLE SPEED in the EPS DATA LIST with the HDS.
The system is OK at this time.
Go to step 7. 7. Check for DTCs in the fuel and emissions system
(M/T) or A/T system (A/T) with the HDS.
Troubleshoot the indicated DTC(s).
Go to step 8.
8. Start the engine, and check the tachometer.
Go to step 9.
Troubleshoot the gauge control module (tach)
(see page 22-241).
9. Turn the ignition switch to LOCK (0).
10. Short the SCS line with the HDS.
11. Disconnect ECM/PCM connector A (44P) and EPS control unit connector D (28P).
(cont’d)
Is t he v ehi cl e speed i nd i cat ed ? Is DT C P07 20, P07 21, P07 22 or P07 23
indicated?
I s t he t achomet er w or k i ng cor r ect l y ?
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22-239
COOLANT TEMPERATURE GAUGESPEEDOMETER
FUEL GAUGE
TACHOMETER ODO/TRIP/OUTSIDE AIR
TEMPERATURE DISPLAY A/T GEAR POSITION INDICATOR
(cont’d)
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Entering the self-diagnostic function with the HDS
Entering the self-diagnostic function (manual method)
22-241
Self-diagnostic Function
ON (II)
OFF ON
OFF ON
Ignition
Switch
Lighting
Switch
SEL/RESET
Switch
5sec.
5sec.
LOCK (0)
Before troubleshooting the gauge system, refer to multiplex integrated control system B-CAN System Diagnosis Test
Mode A (see page 22-93).
The gauge control module (tach) has a self-diagnostic function shown, and also has a customizable reset function.
 The beeper drive circuit check.
 The indicator drive circuit check.
 The switch input test.
 The LCD segments check.
 The gauges drive circuit check (Tachometer, Fuel gauge, Coolant temperature gauge).
 The communication line check (B-CAN, F-CAN, and UART lines).
NOTE: Indicators are also controlled via the communication line.
Using the HDS, select Body Electrical, Gauges, then Function Test and do the self-diagnostic function.
Before doing the self-diagnostic function, check the No. 10 (7.5 A) fuse in the under-dash fuse/relay box and the No. 23
(10 A) fuse in the under-hood fuse/relay box. 1. Push and hold the SEL/RESET switch button.
2. Turn the headlights ON.
3. Turn the ignition switch to ON (II).
4. Within 5 sec., turn the headlights OFF, then ON and OFF again.
5. Within 5 sec., release the SEL/RESET switch button, and then push and release the button three times repeatedly.
NOTE:  While in the self-diagnostic mode, the dash lights brightness controller operates normally.
 While in the self-diagnostic mode, the SEL/RESET switch button is used to start the Beeper Drive Circuit Test and the Gauge Drive Circuit Check.
 If the vehicle speed exceeds 2 km/h (1.2 mph) or the ignition switch is turned to LOCK (0), the self-diagnostic mode ends.
(cont’d)
Move to self-diagnostic mode.
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The Indicator Drive Circuit Check
Switch Input Check
The Beeper Drive Circuit Check
The LCD Segment Check
The Gauge Drive Circuit Check
22-242Gauges
Self-diagnostic Function (cont’d)
OFF ON
OFF ON
OFF ON
OFF ON
Gauge needles
Beeper
5sec.
Self-diagnostic
mode
SEL/RESET
SWITCH
When entering the self-diagnostic mode, the following indicators blink:
A/T gear position indicator, ABS indicator, brake system indicator, charging system indicator, cruise control indicator,
cruise main indicator, door indicator, DRL indicator, EPS indicator, fog light indicator , high beam indicator,
immobilizer indicator, lights-on indicator, low fuel indicator, low oil pressure indicator, low tire pressure indicator ,
maintenance minder indicator, malfunction indicator lamp (MIL), REV limit indicator (TYPE S model), seat belt
reminder indicator, security indicator, side airbag cutoff indicator, SRS indicator, TPMS indicator , trunk indicator,
VSA activation indicator , VSA indicator , and washer fluid level indicator.
1: ’07 TYPE S and ’08-09 models
2: ’08-09 models
3: TYPE S and ’08 Premium and ’09 models
At the initial stage of the self-diagnostic function, the beep sounds intermittently, the beeper sounds continuously
when any of the following switch inputs are switched from OFF to ON:
Cruise control main, dash lights brightness controller volume ( ), ( ) button, mph km/h switch, parking brake switch,
SEL/RESET switch, SET, RESUME, CANCEL switches, and VSA OFF switch . : ’07 TYPE S and ’08-09 models
When entering the self-diagnostic mode, the beeper sounds five times.
When entering the self-diagnostic mode, all the segments blink five times.
When entering the self-diagnostic mode, the tachometer needle sweeps from the minimum position to maximum
position, then returns to the minimum position.
NOTE:
After the beeper stops sounding and the gauge needle returns to the minimum position, pushing the SEL/RESET
switch starts the Beeper Drive Circuit Check (one beep) and the Gauge Drive Circuit Check again.
The check cannot be started again until the gauge needle returns to the minimum position.
If the needle fails to sweep, or the beeper does not sound, replace the gauge control module (tach).
3 2
2
11
The needle sweeps from the
minimum position to the
maximum position, then return
to the minimum position.
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Except TYPE S model
22-244Gauges
Circuit Diagram - Gauge Control Module (Tach)
UART
WHT
IG1 HOT in ON (II) and START (III)
UNDER-HOOD FUSE/RELAY BOX
5V



MAIN CIRCUIT
MAIN CIRCUIT
MICU
  LT GRN
20
21
PNK
124
CAN L
CAN H 

 CHIME
BRN
WHT BRN
RED 19
1
WHT No. 2 (IG) (50 A)
GAUGE CONTROL MODULE (TACH) 18 17 TACHOMETER ORN
IG1
BAT
BLU
WHT
No. 23 (10 A)
BATTERY
IGNITION SWITCH
No. 1 (BAT) (100 A)
(7.5 A) No. 10UNDER-DASH
FUSE/RELAY
BOX
GAUGE CONTROL
MODULE (SPEEDO)
DRIVE
CIRCUIT DIMMING
CIRCUIT
PARKING
BRAKE
REMINDER
SEAT
BELT
REMINDER
KEY-IN
REMINDER
F-CAN
TRANSCEIVER B-CAN
TRANSCEIVER
IMMOBILIZER-
KEYLESS
CONTROL UNIT GAUGE
CONTROL
MODULE
(SPEEDO) 10 V
STABILIZING
CIRCUIT
HIGH BEAM
INDICATOR
(LED)
LIGHTS-ON
REMINDER
CLIMATE CONTROL
UNIT
HANDSFREELINK
CONTROL UNIT*3 IMMOBILIZER
INDICATOR
(LED)
ON/OFF
5V
5V
CONTROL
CIRCUIT
H1
D4 G2D2
Q1 P5 P10 Q9
A
ECM/PCM
ABS MODULATOR-
CONTROL UNIT*1
VSA MODULATOR-
CONTROL UNIT*2
YAW RATE-LATERAL
ACCELERATION SENSOR*2
EPS CONTROL UNIT
TPMS CONTROL UNIT*2
DATA LINK CONNECTOR
SRS UNIT







 MICU
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TYPE S model
22-250Gauges
Circuit Diagram - Gauge Control Module (Tach) (cont’d)
UART
WHT
IG1 HOT in ON (II) and START (III)
UNDER-HOOD FUSE/RELAY BOX









 ECM
VSA MODULATOR-
CONTROL UNIT
YAW RATE-LATERAL
ACCELERATION SENSOR
EPS CONTROL UNIT
TPMS CONTROL UNIT*1
DATA LINK CONNECTOR
SRS UNIT MAIN CIRCUIT
MAIN CIRCUIT
MICU
  GRY
2
21
PNK
124
CAN L
CAN H 

 CHIME
BRN
WHT BRN
RED 19
1
WHT No. 2 (IG) (50 A)
GAUGE CONTROL MODULE (TACH) 18 17 TACHOMETER ORN
IG1
BAT
BLU
WHT
No. 23 (10 A)
BATTERY
IGNITION SWITCH
No. 1 (BAT) (100 A)
(7.5 A) No. 10UNDER-DASH
FUSE/RELAY
BOX
GAUGE CONTROL
MODULE (SPEEDO)
DRIVE
CIRCUIT DIMMING
CIRCUIT
PARKING
BRAKE
REMINDER
SEAT
BELT
REMINDER
KEY-IN
REMINDER
F-CAN
TRANSCEIVER B-CAN
TRANSCEIVER
IMMOBILIZER-
KEYLESS
CONTROL UNIT GAUGE
CONTROL
MODULE
(SPEEDO) 10 V
STABILIZING
CIRCUIT
HIGH BEAM
INDICATOR
(LED)
LIGHTS-ON
REMINDER
CLIMATE CONTROL
UNIT
HANDSFREELINK
CONTROL UNIT*2 IMMOBILIZER
INDICATOR
(LED)
H1
D4 G2D2
Q1 P5 P10 Q9
A DRIVER DRIVERMAIN CIRCUIT
MICU
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Tachometer Speedometer
22-277
Gauge Control Module Replacement
A
B A
B
NOTE: Before replacing the gauge control module, do
the ‘‘Rewriting the ODO Data and Transferring the
Maintenance Minder Data to a New Gauge Control
Module’’ (see page 22-
276).
1. Remove the subdisplay visor assembly (see page 20-100).
2. Remove the three screws from the gauge control module (tach) (A).
3. Disconnect the 36P connector (B) from the gauge control module (tach).
4. Install the gauge control module (tach) in the reverse order of removal. 1. Remove the instrument panel (see page 20-98).
2. Remove the three screws from the gauge control
module (speedo) (A).
3. Disconnect the 12P connector (B) from the gauge control module (speedo).
4. Install the gauge control module (speedo) in the reverse order of removal.
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