Acura CSX. Manual — part 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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