Acura CSX. Manual — part 104
SNR9AA7K72100090116FAAT01
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DTC P0116:
YES
NO
YES
NO
YES
NO
YES
NO
11-90
PGM-FI System
ECT Sensor 1 Circuit Range/
Performance Problem
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. Check ECT SENSOR 1 in the DATA LIST with the
HDS.
Go to step 6.
Go to step 3.
3. Note the value of ECT SENSOR 1 in the DATA LIST
with the HDS.
4. 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.
5. Check ECT SENSOR 1 in the DATA LIST with the
HDS.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at ECT sensor 1 and the ECM/PCM.
Go to step 11.
6. Note the value of ECT SENSOR 1 in the DATA LIST
with the HDS.
7. Turn the ignition switch to LOCK (0).
8. Open the hood, and let the engine cool for 3 hours.
9. Turn the ignition switch to ON (II).
10. Check ECT SENSOR 1 in the DATA LIST with the
HDS.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at ECT sensor 1 and the ECM/PCM.
Go to step 11.
11. Turn the ignition switch to LOCK (0).
12. Replace ECT sensor 1 (see page 11-225).
13. Turn the ignition switch to ON (II).
14. Reset the ECM/PCM with the HDS.
15. Do the ECM/PCM idle learn procedure (see page
11-310).
16. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at ECT sensor 1 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.
Is about 80 °C ( 17 6 °F ) or mor e, or 0.7 8 V or less
indicated?
Does ECT SENSOR 1 change 10 °C ( 18 °F ) or
mor e?
Does ECT SENSOR 1 change 10 °C ( 18 °F ) or
mor e?
Is DT C P0116 indicated?
08/08/21 14:15:42 61SNR030_110_0090
01
SNR9AA7K72100090117FAAT02
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−
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DTC P0117:
YES
NO
YES
NO
YES
NO
YES
NO
11-91
ECT SENSOR 1 2P CONNECTOR
ECT1
(RED/WHT)
ECT Sensor 1 Circuit Low Voltage
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. Check ECT SENSOR 1 in the DATA LIST with the
HDS.
Go to step 3.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at ECT sensor 1 and the ECM/PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect ECT sensor 1 2P connector.
5. Turn the ignition switch to ON (II).
6. Check ECT SENSOR 1 in the DATA LIST with the
HDS.
Go to step 7.
Go to step 11.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect ECM/PCM connector B (44P).
10. Check for continuity between ECT sensor 1 2P
connector terminal No. 1 and body ground.
Repair short in the wire between ECT
sensor 1 and the ECM/PCM (B23), then go to step
13.
Go to step 18.
11. Turn the ignition switch to LOCK (0).
12. Replace ECT sensor 1 (see page 11-225).
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 ECT sensor 1 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.
Wire side of female terminals
Is about 180 °C ( 356 °F ) or mor e, or 0.08 V or less
indicated?
Is about 180 °C ( 356 °F ) or mor e, or 0.08 V or less
indicated?
Is ther e continuity?
Is DT C P0117 indicated?
08/08/21 14:17:16 61SNR030_110_0091
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01
SNR9AA7K72100090118FAAT00
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YES
NO
YES
NO
DTC P0118:
11-92
11-92
PGM-FI System
ECT SENSOR 1 2P CONNECTOR
SG2
(GRN/BLK)
JUMPER WIRE
ECT1
(RED/WHT)
18. Reconnect all connectors.
19. 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).
20. Check for Temporary DTCs or DTCs with the HDS.
Check for poor connections or loose
terminals at ECT sensor 1 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. Check ECT SENSOR 1 in the DATA LIST with the
HDS.
Go to step 3.
Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at ECT sensor 1 and the ECM/PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect ECT sensor 1 2P connector.
5. Connect ECT sensor 1 2P connector terminals No. 1
and No. 2 with a jumper wire.
ECT Sensor 1 Circuit High
Voltage
Wire side of female terminals
Is DT C P0117 indicated?
Is about
40 °C (
40 °F ) or less, or 4.92 V or
mor e indicated?
08/08/21 14:17:16 61SNR030_110_0092
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02
03
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YES
NO
YES
NO
YES
NO
11-93
ECT SENSOR 1 2P CONNECTOR
ECT1
(RED/WHT)
ECT SENSOR 1 2P CONNECTOR
ECM/PCM CONNECTOR B (44P)
SG2 (GRN/BLK)
SG2 (GRN/BLK)
6. Turn the ignition switch to ON (II).
7. Check ECT SENSOR 1 in the DATA LIST with the
HDS.
Go to step 8.
Go to step 20.
8. Turn the ignition switch to LOCK (0).
9. Remove the jumper wire from ECT sensor 1 2P
connector.
10. Turn the ignition switch to ON (II).
11. Measure the voltage between ECT sensor 1 2P
connector terminal No. 1 and body ground.
Go to step 12.
Go to step 16.
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect ECM/PCM connector B (44P).
15. Check for continuity between ECT sensor 1 2P
connector terminal No. 2 and ECM/PCM connector
terminal B33.
Go to step 27.
Repair open in the wire between the ECM/
PCM (B33) and ECT sensor 1, then go to step 22.
Wire side of female terminals
Wire side of female terminals
Terminal side of female terminals
Is about
40 °C (
40 °F ) or less, or 4.92 V or
mor e indicated?
Is ther e about 5 V ?
Is ther e continuity?
08/08/21 14:17:17 61SNR030_110_0093
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