Acura CSX. Instruction — page 142

*01

SNR9AA7K72100091658FAAT00

YES

NO

YES

NO

YES

NO

DTC P1658:

11-241

11-241

F

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

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

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

20. Reconnect all connectors.

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

22. Reset the ECM/PCM with the HDS.

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

11-310).

24. 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.

25. Reconnect all connectors.

26. 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).

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

Check for poor connections or loose

terminals at the throttle body 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.

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. Do the ETCS TEST in the INSPECTION MENU with

the HDS.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the ETCS control relay and the ECM/PCM.

Go to step 3.

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

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

hood fuse/relay box.

ETCS Control Relay ON

Malfunction

Is DT C P0223 indicated?

Is DT C P0223 indicated?

Is the RELAY cir cuit OK ?

08/08/21 14:26:40 61SNR030_110_0241

02

03

YES

NO

YES

NO

YES

NO

11-242

Electronic Throttle Control System

ECM/PCM CONNECTOR A (44P)

ETCSRLY
(YEL)

ECM/PCM CONNECTOR C (44P)

IG1ETCS (WHT)

5. Test the ETCS control relay (see page 22-70).

Go to step 6.

Replace the ETCS control relay, then go to

step 13.

6. Jump the SCS line with the HDS.

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

8. Check for continuity between ECM/PCM connector

terminal A20 and body ground.

Repair short in the wire between the

ECM/PCM (A20) and the ETCS control relay, then
go to step 13.

Go to step 9.

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

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

11. Measure the voltage between ECM/PCM connector

terminal C1 and body ground.

Repair short to power in the wire between

the ECM/PCM (C1) and the ETCS control relay, then
go to step 12.

Go to step 18.

Terminal side of female terminals

Terminal side of female terminals

Is the ET CS contr ol r elay OK ?

Is ther e continuity?

Is ther e batter y voltage?

08/08/21 14:26:41 61SNR030_110_0242

*01

SNR9AA7K72100091659FAAT00

YES

NO

YES

NO

YES

NO

YES

NO

DTC P1659:

11-243

11-243

F

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

13. Reconnect all connectors.

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

15. Reset the ECM/PCM with the HDS.

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

11-310).

17. 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.

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

19. Reconnect all connectors.

20. 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).

21. 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.

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. Check for Temporary DTCs or DTCs with the HDS.

Go to step 4.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the ETCS control relay and the ECM/PCM.

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

5. Check the No. 21 DBW (THROTTLE ACTUATOR

CONTROL) (15 A) fuse in the under-hood fuse/relay
box.

Go to step 6.

Go to step 17.

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

hood fuse/relay box.

ETCS Control Relay OFF

Malfunction

Is DT C P1658 indicated?

Is DT C P1658 indicated?

Is DT C P1659 indicated?

Is the f use OK ?

08/08/21 14:26:41 61SNR030_110_0243

02

03

YES

NO

YES

NO

YES

NO

11-244

Electronic Throttle Control System

ETCS CONTROL RELAY 4P CONNECTOR

IGP

B

ETCS CONTROL RELAY 4P CONNECTOR

7. Test the ETCS control relay (see page 22-70).

Go to step 8.

Replace the ETCS control relay, then go to

step 23.

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

9. Measure the voltage between ETCS control relay

4P connector terminal No. 4 and body ground.

Go to step 10.

Replace the under-hood fuse/relay box

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

10. Measure the voltage between ETCS control relay

4P connector terminal No. 1 and body ground.

Go to step 11.

Replace the under-hood fuse/relay box

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

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

12. Jump the SCS line with the HDS.

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

Terminal side of female terminals

Terminal side of female terminals

Is the ET CS contr ol r elay OK ?

Is ther e batter y voltage?

Is ther e batter y voltage?

08/08/21 14:26:41 61SNR030_110_0244

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