Acura CSX. Instruction — page 143

*02

*04

YES

NO

YES

NO

11-245

IG1ETCS

ECM/PCM CONNECTOR C (44P)

IG1ETCS
(WHT)

ETCS CONTROL RELAY 4P CONNECTOR

ECM/PCM CONNECTOR A (44P)

ETCSRLY

ETCSRLY
(YEL)

ETCS CONTROL RELAY 4P CONNECTOR

14. Check for continuity between ETCS control relay 4P

connector terminal No. 2 and ECM/PCM connector
terminal C1.

Go to step 15.

Repair open in the wire between the ECM/

PCM (C1) and the ETCS control relay, then go to
step 23.

15. Disconnect ECM/PCM connector A (44P).

16. Check for continuity between ETCS control relay 4P

connector terminal No. 3 and ECM/PCM connector
terminal A20.

Go to step 28.

Repair open in the wire between the ECM/

PCM (A20) and the ETCS control relay, then go to
step 23.

Terminal side of female terminals

Terminal side of female terminals

Terminal side of female terminals

Terminal side of female terminals

Is ther e continuity?

Is ther e continuity?

08/08/21 14:26:42 61SNR030_110_0245

*03

07

07

YES

NO

YES

NO

YES

NO

11-246

Electronic Throttle Control System

F

ECM/PCM CONNECTOR C (44P)

IG1ETCS (WHT)

B

ETCS CONTROL RELAY 4P CONNECTOR

17. Remove the ETCS control relay (F) from the under-

hood fuse/relay box.

18. Jump the SCS line with the HDS.

19. Disconnect ECM/PCM connector C (44P).

20. Check for continuity between ECM/PCM connector

terminal C1 and body ground.

Repair short in the wire between the ECM/

PCM (C1) and the ETCS control relay, then go to
step 23.

Go to step 21.

21. Check for continuity between ETCS control relay 4P

connector terminal No. 1 and body ground.

Replace the under-hood fuse/relay box

(see page 22-65), then go to step 23.

Go to step 28.

22. Turn the ignition switch to LOCK (0).

23. Reconnect all connectors.

24. Turn the ignition switch to ON (II).

25. Reset the ECM/PCM with the HDS.

26. Do the ECM/PCM idle learn procedure (see page

11-310).

27. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the ETCS control relay and the ECM/
PCM, then go to step 1.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs are indicated, go to the
indicated DTC’s troubleshooting.

Terminal side of female terminals

Terminal side of female terminals

Is ther e continuity?

Is ther e continuity?

Is DT C P1659 indicated?

08/08/21 14:26:43 61SNR030_110_0246

SNR9AA7K72100091683FAAT30

YES

NO

YES

NO

DTC P1683:

11-247

11-247

28. Reconnect all connectors.

29. 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).

30. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the ETCS control relay and the ECM/
PCM. If the ECM/PCM was updated, substitute a
known-good ECM/PCM (see page 11-7), then
recheck. If the ECM/PCM was substituted, go to
step 1.

If the ECM/PCM was updated, troubleshooting

is complete. If the ECM/PCM was substituted,
replace the original ECM/PCM (see page 11-228). If
any other Temporary DTCs or DTCs are indicated,
go to the indicated DTC’s troubleshooting.

Do not insert your fingers into the installed throttle
body when you turn the ignition switch to ON (II) or
while the ignition switch is ON (II). If you do, you
will seriously injure your fingers if the throttle valve
is activated.

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. Clear the DTC with the HDS.

3. 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, then let it
idle.

4. Turn the ignition switch to LOCK (0), and wait

10 seconds.

5. Turn the ignition switch to ON (II).

6. Check for Temporary DTCs or DTCs with the HDS.

Go to step 7.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the throttle body and the ECM/PCM.

7. Turn the ignition switch to LOCK (0).

8. Disconnect the intake air duct from the throttle

body; K20Z2 engine (see page 11-348), K20Z3
engine (see page 11-349).

Throttle Valve Default Position

Spring Performance Problem

Is DT C P1659 indicated?

Is DT C P1683 indicated?

08/08/21 14:26:43 61SNR030_110_0247

01

SNR9AA7K72100091684FAAT30

YES

NO

YES

NO

YES

NO

DTC P1684:

11-248

11-248

Electronic Throttle Control System

9. Push the throttle valve closed as shown.

10. Release the throttle valve.

Clean the throttle body (see page 11-344),

then go to step 12 and recheck. If DTC P1683 is
indicated, go to step 11.

Go to step 11.

11. Replace the throttle body; K20Z2 engine (see page

11-348), K20Z3 engine (see page 11-349).

12. Turn the ignition switch to ON (II).

13. Reset the ECM/PCM with the HDS.

14. Do the ECM/PCM idle learn procedure (see page

11-310).

15. Turn the ignition switch to LOCK (0), and wait

10 seconds.

16. Turn the ignition switch to ON (II).

17. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the throttle body and the ECM/PCM,
then go to step 1.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs are indicated, go to the
indicated DTC’s troubleshooting.

Do not insert your fingers into the installed throttle
body when you turn the ignition switch to ON (II) or
while the ignition switch is ON (II). If you do, you
will seriously injure your fingers if the throttle valve
is activated.

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. Clear the DTC with the HDS.

3. 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, then let it
idle.

4. Turn the ignition switch to LOCK (0), and wait

10 seconds.

5. Turn the ignition switch to ON (II).

6. Check for Temporary DTCs or DTCs with the HDS.

Go to step 7.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the throttle body and the ECM/PCM.

7. Turn the ignition switch to LOCK (0).

8. Disconnect the intake air duct from the throttle

body; K20Z2 engine (see page 11-348), K20Z3
engine (see page 11-349).

Throttle Valve Return Spring

Performance Problem

Does the thr ottle valve r etur n?

Is DT C P1683 indicated?

Is DT C P1684 indicated?

08/08/21 14:26:43 61SNR030_110_0248

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