Acura CSX. Instruction — page 104

SNR9AA7K72100090116FAAT01

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

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

01

SNR9AA7K72100090118FAAT00

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

02

03

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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