Acura CSX. Manual — part 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
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−
−
−
−
−
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
+
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−
−
−
−
−
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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